thermapitch tp10 rafter level insulation -...

CI/Sfb

Fourth Issue November 2005

(27.9) Rn7 M2

● High performance rigid urethaneinsulation – thermal conductivity0.022–0.023 W/m.K

● On average its use creates 15%more usable warm roof space

● Insulation of pipes and tanks isunnecessary

● No condensation risk

● Unaffected by air movement

● Resistant to the passage ofwater vapour

● Easy to handle and install

● Ideal for newbuild andrefurbishment

● Non–deleterious material

● CFC/HCFC–free with zero OzoneDepletion Potential (ODP)

RAFTER LEVEL INSULATION FOR TILED OR SLATEDPITCHED WARM ROOF SPACES

BBABRITISHBOARD OFAGRÉMENT

CERTIFICATE 95/3126

I nsu la t ion

TP10

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Typical Design DetailsFigure 1 Unventilated Insulation Between & Under Rafters (Recommended for New Build or Re–roofing)

Figure 1a Fully Filled Insulation Between Rafters – No SarkingBoard

Figure 1b Partially Filled Insulation Between Rafters – No SarkingBoard

Figure 1c Fully Filled Insulation Between Rafters – 18 mm SarkingBoard

Figure 1d Partially Filled Insulation Between Rafters – 18 mmSarking Board

Figure 2a No Sarking Board Figure 2b 18 mm Sarking Board

Figure 2 Ventilated Insulation Between & Under Rafters (Recommended for Loft Conversion)

Rafter

Kingspan Thermapitch® TP10between rafters

Rafter

Slates****

*Breathable sarkingmembrane eg. Kingspan nilvent ®

Horizontal lap between runs of breathablesarking membrane. NB. The breathablesarking membrane could be installed vertically under counter battens and pulled taut in which case the air space under the breathable sarking membrane is unventilated

Rafter

Kingspan Thermapitch®

TP10 between rafters

Kingspan Kooltherm® K18 InsulatedDry–lining Board under rafters**/***

Tiles/slates Tiles/slate batten


Horizontal lap betweenruns of sarking felt

Rafter

Horizontal lap betweenruns of sarking felt

Ventilated air space (50 mmmin) above insulation tocurrent BuildingRegulations/Standards

Sarking felt

Tiles/slates Tile/slate batten

Air space (25 mm min) aboveinsulation to provide a space to drapethe breathable sarking membrane

Timber batten

Timber batten

Slates**** 18 mm sarking board

Kingspan Kooltherm®

K18 Insulated Dry–liningBoard under rafters**/***

Horizontal lap between runs ofbreathable sarking membranesealed (if required) with 75 mmwide double sided acrylic adhesive tape




38 x 38 mm counter batten




18 mm sarking board

Slates**** 18 mm sarking boardHorizontal lap between runs ofbreathable sarking membrane sealed (if required) with 75 mm wide double sided acrylicadhesive tape

Rafter





Kingspan Kooltherm® K18Insulated Dry–lining Board under rafters**/***

Unventilated airspace

Timber batten



TP10



Kingspan Kooltherm® K18 InsulatedDry–lining Board under rafters**/***

Rafter

Ventilated air space (50 mmmin) above insulation tocurrent BuildingRegulations/Standards

Sarking felt

Timber batten

3


Figure 3 Unventilated Insulation Between Rafters (Recommended for New Build or Re–roofing)

Figure 3a Fully Filled Insulation Between Rafters – No Sarking Board

Figure 3b Partially Filled Insulation Between Rafters – No SarkingBoard

Figure 3c Fully Filled Insulation Between Rafters – 18 mm SarkingBoard

Figure 3d Partially Filled Insulation Between Rafters – 18 mmSarking Board

Figure 4 Ventilated Insulation Between Rafters (Recommended for Loft Conversion)



Rafters



12.5 mm plasterboard**


38 x 38 mmcounter batten



Horizontal lap between runs ofbreathable sarking membranesealed (if required) with 75 mm wide doublesided acrylic adhesive tape

Rafter



12.5 mm plasterboard**





Horizontal lap between runs of sarking felt

Timber batten

Rafter

Ventilated air space (50 mmmin) above insulation tocurrent BuildingRegulations/Standards 12.5 mm plasterboard**

Sarking felt

Tiles/slates Tile/slate batten Horizontal lap betweenruns of sarking felt

Rafter

Ventilated air space(50 mm min) aboveinsulation to currentBuilding Regulations/Standards


Timber batten

Rafter



12.5 mmplasterboard**


Air space (25 mm min)above insulation toprovide a space to drapethe breathable sarkingmembraneTimber batten


Rafters



12.5 mm plasterboard**Timber batten


Unventilated air space



Sarking felt

Vapour control layer***** 12.5 mm plasterboard** Vapour control layer*****

Vapour control layer*****Vapour control layer*****

Vapour control layer*****Vapour control layer*****

Horizontal lap between runs of breathablesarking membrane. NB. The breathablesarking membrane could be installed vertically under counter battens and pulled taut in which case the air space under the breathable sarking membrane is unventilated

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Specification ClauseKingspan Thermapitch® TP10 should be described inspecifications as:–

The rafter level insulation shall be Kingspan Thermapitch®

TP10 ____mm thick comprising a CFC/HCFC–free rigidurethane insulation core with low emissivity composite foilfacings on both sides manufactured to the highest standards inaccordance with both the requirements of draft BS 4841–5 andquality control systems approved to BS EN ISO 9001: 2000/I.S.EN ISO 9001: 2000 by Kingspan Insulation Limited and shall beapplied in accordance with the instructions issued by them.

Details also available in NBS PLUS.NBS users should refer to clause K11 695.

* The breathable sarking membrane can be placed over the counter battens, draped toprovide for drainage and overlain with tile/slate battens. This will yield a marginally betterU–value but it will be more difficult to seal the breathable sarking membrane effectively.

** The requirement for a vapour control layer and/or under tile ventilation should beassessed to BS 5250: 2002. Vapour check plasterboard or a separate vapour controllayer can be used as preferred.

*** Kingspan Kooltherm® K18 Insulated Dry–lining Board contains an integral vapour control layer.

**** If tiles are to be used then this normally necessitates the use of counter battens and tilingbattens over the breathable sarking membrane to allow for water drainage andattachment of the tiles.

***** Suitability recommended by the Kingspan Insulation Technical Services Department.

Figure 6 Unventilated Insulation Over Rafters (Recommended for New Build or Re–roofing)


Figure 5 Unventilated Insulation Between & Over Rafters (Recommended for New Build or Re–roofing)


Horizontal lap between runs of breathable sarking membrane sealed (if required) with 75 mm wide double sided acrylic adhesive tape

Rafter

Kingspan Thermapitch® TP10between and over rafters

12.5 mm Plasterboard**

Rafter




Nailable sarking clips


Horizontal lap between runs of breathable sarking membrane sealed (if required) with 75 mm wide double sided acrylic adhesive tape

Rafter Rafter



Horizontal lap between runs ofbreathable sarking membranesealed (if required) with 75 mm wide double sided acrylic adhesive tape


Horizontal lap between runs ofbreathable sarking membranesealed (if required) with 75 mm wide double sided acrylic adhesive tape




12.5 mm Plasterboard** Nailable sarking clips





Unventilated air space*Breathable sarkingmembrane eg. Kingspan nilvent ®




TP10

5

Design ConsiderationsSustainabilityIn the past, erroneously, the relative environmental sustainabilityof insulation materials has been compared on the basis ofembodied energy and ozone depletion potential. It is nowrecognised that a much wider basket of embodiedenvironmental impacts (including those caused by theirembodied energy), rather than embodied energy alone, is theonly credible tool of comparison. Time has also annulled ozonedepletion potential as an issue as all insulation materials arenow banned from using CFC and HCFC blowing agents by law.

For buildings designed to today’s Building Regulations energyuse standards it is now also known that the embodiedenvironmental impacts of all of the materials and labour usedto create a building are insignificant in comparison with thelifetime operational environmental impacts of that building andso are of very limited importance. Since it is operational energyuse that creates the vast majority of operational environmentalimpact, saving energy by specifying the lowest U-valuespossible is the most environmentally sustainable action to take.

However, one of the most neglected facts aboutenvironmentally sustainable buildings is that the longevity oftheir standards of operational energy use, and therefore thelongevity their operational environmental impacts, is critical.The performance of some insulants, such as mineral fibre, candeteriorate rapidly if exposed to water penetration, airmovement or compression. This may increase operationalenergy use and hence compromise the environmentalsustainability of the finished building to an alarming degree.Other insulation materials, such as rigid phenolic or rigidurethane, are not vulnerable to any of these problems.

In summary, designers should:

(a) specify the lowest possible U-value regardless of insulation type;

(b) design out the risk of their chosen insulant not performingas specified; and (c) if the latter is not possible, choose aninsulant that is at low risk of failure e.g. a cellular plasticinsulation material.

However, manufacturers should not rest on their laurels, it is amatter of social responsibility to be open and honest about theenvironmental impact of the manufacture of a product, and afull Life Cycle Analysis (LCA) based on a much wider basket ofenvironmental impacts, rather than embodied energy alone, isrecognised as the preferred tool to achieve this.

Kingspan Insulation was the first insulation manufacturer tocomplete and openly publish an independently certifiedEcoprofile (a type of LCA) on one of its product ranges. The Ecoprofile was carried out on the Therma zero ODP rangeof rigid urethane insulation products by the BuildingResearch Establishment (BRE). The productrange comfortably achieves a BRE Green GuideA rating.

But there is far more to sustainability than whether or not aproduct, process or company affects the environment in apositive or a negative way. A company can and shoulddemonstrate its financial viability and social responsibility, aswell as ensure that its materials and methods do not addunduly to the burden placed on the planet.

Kingspan Insulation has now put the manufacture of itsproducts at its Pembridge facility in Herefordshire through arigorous independent appraisal of its economic, social,environmental and natural resource impacts using Arup’sSPeAR® tool.

The results show a well balanced performance in terms ofsustainability, and that Kingspan Insulation is already meetinglegislation or best practice in most areas, even moving beyondbest practice in some. Kingspan Insulation is the first and onlyconstruction material manufacturer to have taken this boldmove and openly publish the results.

Unventilated (Sealed and Unsealed) and VentilatedConstructionsThere is generally a choice between either approach, except inthe case of refurbishment/loft conversions. In these instances,unless the whole roof is to be stripped, it is impossible to usean unventilated roof, because a breathable sarking membranecannot be installed.

Recent research suggests that the unventilated, sealed roofapproach yields a more energy efficient roof as the impacts ofventilation and incidental infiltrating cold air are negated.

Position of InsulationDependent on the designed insulation value of the constructionand the available rafter depth and headroom, differentapproaches can be taken. It may be necessary to use two layersof insulation to achieve required U–values e.g. Figures 1, 2 & 5.

An additional benefit of two layer systems and the Insulation OverRafter approach (see Figure 1, 2, 5 & 6) is that thermal bridgingcaused by the rafter is prevented and the potential for patternstaining in the position of the rafters is completely avoided. The choice maybe influenced by the available headroom andconcerns over the depth of bargeboards.

Approaches with a layer of insulation over rafter are likely to yieldvery large fascia boards and so generally, between and underrafter insulation approaches are probably more desirable e.g. (Figures 1 and 2).

Note: However, where the choice is for two layers, the layerwith the greatest effective R–value should be placed uppermostin order to prevent condensation between the two layers.

Unventilated Roof – Ventilation ConsiderationsUnventilated roof approaches create a warm pitched roofspace, which does not require cross ventilation. Recentresearch suggests that sealing an unventilated roof, yields amore energy efficient roof as the impacts of ventilation andincidental infiltrating cold air are negated. Therefore, if creatingan unventilated roof, it is preferable to fully seal all joints in thebreathable sarking membrane with tape. Any water vapourreaching the breathable sarking membrane escapes withoutcondensing. There is then adequate air movement beneath thetiles to dissipate this water vapour to the outside atmosphere.Tape for sealing joints in the breathable sarking membraneshould be specified in accordance with the recommendationsof the breather membrane manufacturer.

The requirement for a vapour control layer and/or under–tileventilation should be assessed to BS 5250: 2002 (Code of practice for control of condensation in buildings).Vapour check plasterboard or a separate vapour control layercan be specified, as preferred if required.

Note: Kingspan Kooltherm® K18 Insulated Dry–lining Board,as used in Figure 1, contains an integral vapour control layer.

Ventilated Roof – Ventilation ConsiderationsIn these cases the Building Regulations/Standards require a 50 mm ventilation air gap between the insulation and the sarkingfelt, so as to avoid condensation.

The requirement for a vapour control layer should be assessedto BS 5250: 2002 (Code of practice for control of condensationin buildings). Vapour check plasterboard or a separate vapourcontrol layer can be specified, as preferred if required.

Note: Kingspan Kooltherm® K18 Insulated Dry–lining Board,as used in Figure 2, contains an integral vapour control layer.

Breathable Sarking MembraneBS 5250: 2002 recommends that the vapour resistance of thebreathable sarking membrane must not exceed 0.25 MN.s/ge.g. Kingspan nilvent ®.

Position of Breathable Sarking MembraneThe taping of breathable sarking membrane joints is considerablyeasier to achieve if the membrane is installed on a continuoussurface (Figures 1a, 1c, 1d, 3a, 3c, 3d, 5a, 5b, 6a & 6b).

In these cases, the breathable sarking membrane is installedunder the counter battens, which provide a channel for waterdrainage, or in situations with a sarking board under a slatedroof, directly under the slates (as neither tile battens nor counterbattens are used).

Generally, when a continuous surface is available, it will proveeasier to install the breathable sarking membrane in horizontalruns, whilst still enabling easy sealing between runs.

In some cases with a continuous surface (Figure 1a, 3a, 5a &6a, and 1c, 1d, 3c, 3d, 5b & 6b when counter battens, tilingbattens and tiles replace slates nailed directly into the sarkingboard) the breathable sarking membrane can be installed overthe counter battens. This yields a marginally better designU–value but it may be more difficult to seal the breathablesarking membrane joints effectively, as the membrane must bedraped over the counter battens in horizontal runs so as toprovide a water drainage channel. The air movement allowedby the unsealed membrane may negate the benefit of puttingthe membrane above the counter battens.

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TP10

In situations where there is no continuous surface (Figures 1band 3b), the breathable sarking membrane can be draped overthe rafters in horizontal runs to provide a channel for waterdrainage. In this situation, sealing of the breathable sarkingmembrane joints will prove difficult.

In roofs with no continuous surface, it is preferable, thoughmore difficult, to install the breathable sarking membrane invertical runs with junctions between runs sealed bycounterbattens placed over the laps in rafter positions. The breathable sarking membrane is installed taut as thecounterbatten provides a space for water drainage.

Recommended Solutions for New Build/Re–roofingThe ideal solution for new build or re–roofing projects is,therefore, between and under rafter insulation with a continuoussurface for the breathable sarking membrane so that it can beinstalled in horizontal runs under counterbattens with laps sealed(Figures 1a, 1c and 1d).

The next best solution is, therefore, between and under rafterinsulation with no continuous surface for the breathablesarking membrane, and the breathable sarking membraneinstalled in vertical runs with laps sealed under counterbattens(Figure 1b).

Mansard Roofs/WallsKingspan Thermapitch® TP10 can be used for the constructionof insulated tiled or slated mansard roofs/walls. Its application onsuch contracts is identical to the standard specification, which isgiven here.

Fire StopsCurrent Building Regulations/Standards should be consideredwith regard to the requirements for and/or provision of fire stops.

7

Typical U–valuesThe U–value requirements as detailed in the appropriateBuilding Regulations/Standards can be easily achieved utilisingthe appropriate thickness of Kingspan Thermapitch® TP10.The calculation of U–values for pitched roof insulationpurposes is determined by a number of factors:

● will the loft space be habitable or not;

● does the ceiling line follow the pitch of the roof or is it a flathorizontal ceiling;

● the pitch of the roof (where a horizontal ceiling is to beused); and

● rafter centres/depth/width where insulation is betweenrafters.

The following examples have been calculated using thecombined method for compliance with BuildingRegulations/Standards revised after the year 2002. These examples are based on the constructions shown inFigures 1 to 6 with 50 mm wide rafters at 600/400 mmcentres and 12.5 mm plasterboard.* If your construction is anydifferent, please consult the Kingspan Insulation TechnicalServices Department (see rear cover).

Combined Method – U–values were calculated using themethod which has been adopted to bring National standardsin line with the European Standard calculation method, BS/I.S. EN ISO 6946: 1997 (Building components and buildingelements. Thermal resistance and thermal transmittance.Calculation method).

NB when calculating U–values using the combined method as detailed in BS/I.S. EN ISO6946: 1997, the type of mechanical fixing used may change the thickness of insulationrequired. The effect of fixings has been ignored for the purposes of these calculations. Please contact the Kingspan Insulation Technical Services Department (see rear cover) forproject calculations.

NB for the purposes of these calculations the standard of workmanship has been assumedgood and therefore the correction factor for air gaps has been ignored.

The figures in the U–value tables (pages 8–11) are for guidance only. A detailed U–valuecalculation together with a condensation risk analysis should be completed for each individualproject. Please contact the Kingspan Insulation Technical Services Department for assistance (see rear cover).

*Unless otherwise stated.

8

Insulant Thickness U–value (W/m2.K)(mm) Rafter centres (mm)

600 400

75 0.25 0.26100 0.21 0.22115 0.19 0.20125 0.18 0.19150 0.15 0.17155 0.15 0.16

NB calculations based on rafters being underlined with Kingspan Kooltherm® K18 Insulated Dry–lining Board comprising 12.5 mm plasterboard and 25 mm of insulation ofthermal conductivity 0.023 W/m.K. Thickness shown in the table above is only the between rafter component.

NB the thermal resistance of the between rafter layer must be ≥ that of the under rafter layer so as to avoid condensation.

Fully Filled Insulation Between Rafters – 18 mm Sarking Board

(Fig 1c)


600 400

25 0.36 0.3730 0.34 0.3535 0.33 0.3440 0.31 0.3250 0.28 0.2960 0.26 0.2765 0.24 0.2670 0.24 0.2575 0.23 0.2480 0.22 0.2390 0.20 0.2295 0.20 0.21

100 0.19 0.20110 0.18 0.19120 0.17 0.18125 0.16 0.18130 0.16 0.17145 0.15 0.16

NB calculations based on rafters being underlined with Kingspan Kooltherm® K18Insulated Dry–lining Board comprising 12.5 mm plasterboard and 25 mm of insulation ofthermal conductivity 0.023 W/m.K. Thickness shown in the table above is only thebetween rafter component. Calculations assume that there is a minimum 25 mm airspacebetween the rafters above the insulation layer installed between them.

NB the thermal resistance of the between rafter layer must be ≥ that of the under rafterlayer so as to avoid condensation.

Partially Filled Insulation Between Rafters – 18 mm Sarking Board

(Fig 1d)

Unventilated Insulation Between & Under Rafters


600 400

75 0.25 0.27100 0.21 0.22115 0.19 0.20125 0.18 0.19150 0.15 0.17155 0.15 0.16

NB calculations based on rafters being underlined with Kingspan Kooltherm® K18 Insulated Dry–lining Board comprising 12.5 mm plasterboard and 25 mm of insulation ofthermal conductivity 0.023 W/m.K. Thickness shown in the table above is only the between rafter component.


Fully Filled Insulation Between Rafters – No Sarking Board (Fig 1a)


600 400

25 0.36 0.3830 0.34 0.3635 0.33 0.3440 0.31 0.3245 0.29 0.3150 0.28 0.2960 0.26 0.2765 0.25 0.2670 0.24 0.2575 0.23 0.2480 0.22 0.2390 0.20 0.2295 0.20 0.21

100 0.19 0.20110 0.18 0.19120 0.17 0.18125 0.17 0.18130 0.16 0.17145 0.15 0.16

NB calculations based on rafters being underlined with Kingspan Kooltherm® K18Insulated Dry–lining Board comprising 12.5 mm plasterboard and 25 mm of insulation ofthermal conductivity 0.023 W/m.K. Thickness shown in the table above is only thebetween rafter component. Calculations assume that there is a minimum 25 mm airspacebetween the rafters above the insulation layer installed between them.


Partially Filled Insulation Between Rafters – No Sarking Board

(Fig 1b)

TP10

9


600 400

75 0.35 0.3980 0.34 0.3790 0.30 0.34

100 0.28 0.31125 0.23 0.25150 0.19 0.22175 0.17 0.19200 0.15 0.17205 0.14 0.16

Fully Filled Insulation Between Rafters – 18 mm Sarking Board

(Fig 3c)


600 400

75 0.36 0.4080 0.34 0.3790 0.31 0.34

100 0.28 0.31125 0.23 0.26150 0.19 0.22175 0.17 0.19200 0.15 0.17205 0.14 0.16

Fully Filled Insulation Between Rafters – No Sarking Board (Fig 3a)

Ventilated Insulation Between & Under Rafters


600 400

25 0.43 0.4430 0.40 0.4140 0.35 0.3745 0.33 0.3550 0.32 0.3355 0.30 0.3260 0.28 0.3070 0.26 0.2875 0.25 0.2780 0.24 0.2690 0.22 0.24

100 0.21 0.22105 0.20 0.22110 0.19 0.21120 0.18 0.20125 0.18 0.19130 0.17 0.19140 0.16 0.18155 0.15 0.16

NB calculations based on rafters being underlined with Kingspan Kooltherm® K18Insulated Dry–lining Board comprising 12.5 mm plasterboard and 25 mm of insulation ofthermal conductivity 0.023 W/m.K. Thickness shown in the table above is only thebetween rafter component. Calculations assume that there is a minimum 50 mmventilated airspace between the rafters above the insulation layer installed between them.


No Sarking Board (Fig 2a)


600 400

25 0.43 0.4430 0.40 0.4140 0.35 0.3745 0.33 0.3550 0.32 0.3355 0.30 0.3260 0.28 0.3070 0.26 0.2875 0.25 0.2780 0.24 0.2690 0.22 0.24

100 0.21 0.22105 0.20 0.22110 0.19 0.21120 0.18 0.20125 0.18 0.19130 0.17 0.19140 0.16 0.18155 0.15 0.16

NB calculations based on rafters being underlined with Kingspan Kooltherm® K18Insulated Dry–lining Board comprising 12.5 mm plasterboard and 25 mm of insulation ofthermal conductivity 0.023 W/m.K. Thickness shown in the table above is only thebetween rafter component. Calculations assume that there is a minimum 50 mmventilated airspace between the rafters above the insulation layer installed between them.


18 mm Sarking Board (Fig 2b)

Unventilated Insulation Between Rafters

10


600 400

60 0.43 0.4770 0.38 0.4275 0.36 0.3980 0.34 0.3790 0.30 0.3495 0.29 0.32

100 0.28 0.31110 0.26 0.29115 0.25 0.27120 0.24 0.26125 0.23 0.25130 0.22 0.25140 0.21 0.23145 0.20 0.22150 0.19 0.22160 0.18 0.20170 0.17 0.19175 0.17 0.19180 0.16 0.18205 0.14 0.16

NB calculations assume that there is a minimum 50 mm ventilated airspace between therafters above the insulation layer installed between them.



600 400

45 0.44 0.4850 0.41 0.4560 0.37 0.4065 0.35 0.3870 0.33 0.3675 0.31 0.3480 0.30 0.3390 0.27 0.30

100 0.25 0.28110 0.23 0.26115 0.22 0.25120 0.22 0.24125 0.21 0.23130 0.20 0.22135 0.20 0.22140 0.19 0.21150 0.18 0.20160 0.17 0.19170 0.16 0.18190 0.15 0.16

NB calculations assume that there is a minimum 25 mm airspace between the rafters above the insulation layer installed between them.

Partially Filled Insulation Between Rafters – No Sarking Board

(Fig 3b)


600 400

45 0.44 0.4850 0.41 0.4560 0.36 0.4065 0.34 0.3870 0.33 0.3675 0.31 0.3480 0.30 0.3290 0.27 0.30

100 0.25 0.27110 0.23 0.26120 0.21 0.24125 0.21 0.23130 0.20 0.22140 0.19 0.21145 0.18 0.20150 0.18 0.20160 0.17 0.19165 0.16 0.18190 0.15 0.16

NB calculations assume that there is a minimum 25 mm airspace between the rafters above the insulation layer installed between them.

Partially Filled Insulation Between Rafters – 18 mm Sarking Board

(Fig 3d)


600 400

60 0.43 0.4770 0.38 0.4275 0.36 0.3980 0.34 0.3790 0.30 0.3495 0.29 0.32

100 0.28 0.31110 0.26 0.29115 0.25 0.27120 0.24 0.26125 0.23 0.25130 0.22 0.25140 0.21 0.23145 0.20 0.22150 0.19 0.22160 0.18 0.20170 0.17 0.19175 0.17 0.19180 0.16 0.18205 0.14 0.16

NB calculations assume that there is a minimum 50 mm ventilated airspace between therafters above the insulation layer installed between them.


Ventilated Insulation Between Rafters

TP10

11

Unventilated Insulation Between & Over Rafters


600 400

20+20 0.42 0.4325+25 0.36 0.3725+30 0.33 0.3430+30 0.31 0.3240+40 0.26 0.2740+45 0.24 0.2550+50 0.21 0.2250+60 0.20 0.2060+60 0.18 0.1960+65 0.18 0.1870+70 0.17 0.1770+75 0.16 0.1775+75 0.16 0.16

NB first thickness refers to thickness between rafters, second thickness over rafters. The thermal resistance of the over rafter layer must be ≥ that of the between rafter layer so as to avoid condensation.

NB combined method calculation accounts for the effect of using a stainless steel fixing of 6.0 mm diameter, giving a cross sectional area of 7.45 mm2.



600 400

20+20 0.42 0.4325+25 0.36 0.3725+30 0.33 0.3430+30 0.31 0.3240+40 0.26 0.2740+45 0.24 0.2550+50 0.21 0.2250+60 0.19 0.2060+60 0.18 0.1960+65 0.18 0.1870+70 0.16 0.1770+75 0.16 0.1775+75 0.16 0.16

NB first thickness refers to thickness between rafters, second thickness over rafters. The thermal resistance of the over rafter layer must be ≥ that of the between rafter layer so as to avoid condensation.




600 400

40 0.40 0.4050 0.34 0.3460 0.30 0.3070 0.26 0.2675 0.25 0.2580 0.24 0.2490 0.21 0.21

100 0.20 0.20110 0.19 0.19120 0.17 0.17125 0.17 0.17130 0.16 0.16

NB combined method calculation accounts for the effect of using a stainless steel fixing of6.0 mm diameter, giving a cross sectional area of 7.45 mm2.



600 400

35 0.44 0.4440 0.40 0.4050 0.34 0.3460 0.30 0.3070 0.26 0.2675 0.25 0.2580 0.24 0.2490 0.21 0.21

100 0.20 0.20110 0.19 0.19115 0.18 0.18120 0.17 0.17125 0.17 0.17130 0.16 0.16



Unventilated Insulation Over Rafters

SiteworkOver Rafter Layer of InsulationOver rafter insulation without a sarking board (Figures 5a & 6a),is simply fixed by placing the Kingspan Thermapitch® TP10boards over the rafters and under 38 x 38 mm treatedsoftwood counter–battens in line with the rafters. Secure thecounter–battens to the rafters by fixing through both thecounter–battens and the Kingspan Thermapitch® TP10.

Over rafter insulation with slates fixed directly into a sarkingboard (Figures 5b & 6b), is simply fixed by placing theKingspan Thermapitch® TP10 boards over the rafters with thesarking board overlaid. Secure the sarking board and KingspanThermapitch® TP10 to the rafters by fixing through both thesarking board and the Kingspan Thermapitch® TP10.

Over rafter insulation with a sarking board and tiles on tilingbattens and counter battens, is simply fixed by placing the Kingspan Thermapitch® TP10 boards over the rafters with the sarking board overlaid, and with 38 x 38 mmsoftwood treated counter–battens in line with the rafters.Secure the counter–battens to the rafters by fixing through the counter–batten, the sarking board and the KingspanThermapitch® TP10.

Boards of Kingspan Thermapitch® TP10 should be tightlybutted, they may be laid either across or down the line of therafters and should preferably be laid break bonded. All board joints running from eaves to ridge must occur over rafters. There is no necessity to tape board joints. A preservative treated stop rail should be secured to the rafters close to the eaves (see Figures 9a & 9b).

Between Rafter Layer of InsulationBetween rafter insulation can be installed by three methods. In cases where the insulation between rafters is to be flushwith the top of the rafters but does not fill the full rafter depth(Figure 5), install the insulation by the use of nailable sarkingclips. The nailable sarking clips are driven into the uppersurface of each rafter at one–metre intervals up the roof slope.The nailable sarking clips then support lengths of KingspanThermapitch® TP10 suitably trimmed to size and placedbetween the rafters.

In cases where the insulation between rafters is to be flushwith the bottom of the rafters but does not fill the full rafterdepth (Figures 1b, 1d, 2a, 2b, 3b, 3d, 4a & 4b), install theinsulation with the aid of battens nailed to the side of therafters. The battens should be in the appropriate position toensure the insulation is flush with the bottom of the rafters.

In cases where the insulation between rafters fully fills the rafterdepth (Figures 1a ,1c, 3a & 3c), simply install the correctthickness of insulation in such a manner that it is flush with thebottom of the rafters.

In all cases, ensure that insulation boards are tightly buttedand that there is a tight fit between the insulation and therafters. Fill all gaps with expanding urethane sealant.

Under Rafter Layer of InsulationPlease refer to literature for Kingspan Kooltherm® K18Insulated Dry–lining Board.

Breathable Sarking MembraneThe specified breathable sarking membrane (e.g. Kingspannilvent ®) is applied as specified. Application advice should besought from the appropriate membrane manufacturer.

Sarking FeltIn cases without a sarking board, the sarking felt is drapedover the rafters to provide a channel for water drainage andheld in place by the slate/tile battens, which are nailed throughthe felt to the rafters.

In cases with a sarking board, the sarking felt is applied overthe sarking board and held in place by the slates or counterbattens which are nailed through the felt to the sarking board.

12

TP10

AvailabilityKingspan Thermapitch® TP10 is available through specialistinsulation distributors and selected builders and roofingmerchants throughout the UK, Ireland and Europe.

PackagingAccording to quantity, the boards are supplied in packs or onpallets, labelled and shrinkwrapped in polythene.

StorageThe packaging of Kingspan Thermapitch® TP10 should not beconsidered adequate for long term outside protection. Ideallyboards should be stored inside a building. If however, outsidestorage cannot be avoided the boards should be stacked clearof the ground and covered with a polythene sheet orweatherproof tarpaulin. Boards that have been allowed to getwet should not be used.

Health and SafetyKingspan Insulation products are chemically inert and safe touse. A leaflet on this topic which satisfies the requirements setout in the Control of Substances Hazardous to HealthRegulations 1988 (COSHH) is available from the KingspanInsulation Marketing Department (see rear cover).

Please note that the reflective surface on this product is designed to enhance its thermalperformance. As such, it will reflect light as well as heat, including ultraviolet light. Therefore, ifthis board is being installed during very bright or sunny weather, it is advisable to wear UVprotective sunglasses or goggles, and if the skin is exposed for a significant period of time, toprotect the bare skin with a UV block sun cream.

The reflective facing used on this product can be slippery underfoot when wet. Therefore, it isrecommended that any excess material should be contained to avoid a slip hazard.

If nailable sarking clips are used, ensure care is taken to avoid skin and eye contact with anysharp edges.

Warning - do not stand on or otherwise support your weight on this board unless it is fullysupported by a load bearing surface.

13

Slating and TilingSlating and tiling over Kingspan Thermapitch® TP10 is exactlythe same as on any other pitched roof except that in someinstances the slate/tile battens are fixed to the previouslyapplied counter–battens. It is, however, essential that slate ortiling rubble does not lay in contact with the breathable sarkingmembrane (if used) as this may allow wind driven rain ormelted snow to penetrate the breathable sarking membrane.

Surface TreatmentThe boards of Kingspan Thermapitch® TP10 have a foil faceddurable surface and no further treatment is necessary.Kingspan Thermapitch® TP10 is not intended to provide an internal finish and should be underlined with a suitablebuilding board.

CuttingCutting should be carried out using a fine toothed saw or by scoring with a knife and snapping the board over a straight edge and cutting the facing on the other side. Ensure accurate trimming to achieve close butting joints and continuity of insulation.

Daily Working PracticeInstalled Kingspan Thermapitch® TP10 boards should beprotected against inclement weather.

Fixings for over Rafter InsulationHelifix In–Skew, Target Skewfast, Wallfast, Timfix or similarapproved fixings should be applied at centres appropriate tothe design of the roof and location of the building.

Refer to:

Helifix Limited +44 (0) 20 8735 5222;Target Fixings Limited +44 (0) 1344 777 189; orWallfast Limited +44 (0) 23 9265 3330.

14

Unventilated Insulation Between & Under Rafters or just Between Rafters (Recommended for New Build or Re–roofing)

Figure 7a Overhanging Eaves Detail – Section Perpendicular to Ridge

Figure 7b Section Parallel to Ridge

Flexible insulation material tightlypacked to block cold bridge andretard air infiltration

Insulation retaining clipand wall tie

Breathable sarking membraneeg. Kingspan nilvent ® drapedover rafters in horizontal runs

Breathable sarking membranelapped over eaves strip

Tiles/slates

Eaves strip

Kingspan Thermapitch® TP10 between rafters

Kingspan Kooltherm® K18Insulated Dry–lining Board under rafters (can be replaced with plasterboard)

Tiles/slate batten

Rafter

Seal gap between floor andsloping ceiling

Flexible insulation material tightly packed to blockcold bridge and retard air infiltration.

Breathable sarking membraneeg. Kingspan nilvent ® draped overrafters in horizontal runs

Breathable membrane fullycovering the undercloak

Tiles/slates


TP10 between raftersKingspan Kooltherm® K18Insulated Dry–lining Boardunder rafters (can be replacedwith 12.5 mm plasterboard)

Air space 25 mm (min.)to provide space todrape the breathablesarking membrane

Tiles/slate batten

Mortar infill

Rafter Timber batten

Flying rafter

Fascia board

Cavity closer


Cavity closer

TP10

15

Ventilated Insulation Between & Under Rafters or just Between Rafters (Recommended for Loft Conversion)


Figure 8b Section Parallel to Ridge

Flexible insulation material tightly packed to blockcold bridge and retard air infiltration

Sarking felt draped over rafters inhorizontal runs

Sarking felt fully coveringthe undercloak

Tiles/slates


TP10 between raftersKingspan Kooltherm®

Insulated K18 Dry–liningBoard under rafters (can be replaced with12.5 mm plasterboard)

Tiles/slate batten

Mortar infill

Rafter Timber batten

Flying rafter

Fascia board

Cavity closer

Flexible insulation material tightlypacked to block cold bridge andretard air infiltration

Cavity closer

Sarking felt draped over rafters inhorizontal runs

Sarking felt is laidinto the gutter

Tiles/slates

Kingspan Thermapitch® TP10 between rafters

Tiles/slate batten

Joist

Ventilation post

Air flow path must notbe blocked

Ventilated air space 50 mm (min.) tocurrent BuildingRegulation/ Standards

Eaves strip

Kingspan Kooltherm® K18Insulated Dry–lining Boardunder rafters (can be replacedwith plasterboard)

Rafter




16

Unventilated Insulation Between & over Rafters or just over Rafters (Recommended for New Build or Re–roofing)


Figure 9b Ridge Detail – Section Perpendicular to Ridge

Breathable sarking membrane eg.Kingspan nilvent ® lapped 150 mm (min)over the ridge from each side

Flexible insulation material tightlypacked to block cold bridge andretard air infiltration.


Tiles/slates Kingspan Thermapitch® TP10between (if required) and over rafters

Tiles/slate batten

Breathable sarking membraneeg. Kingspan nilvent ® drapedover rafters in horizontal runs

Rafters

12.5 mm plasterboard


Breathable sarking membranelapped over eaves strip

Eaves strip

Figure 9c Section Parallel to Ridge

Flexible insulation material tightly packed toblock cold bridge and retard air infiltration

Breathable sarking membrane eg.Kingspan nilvent ® draped over raftersin horizontal runs

Tiles/slates

Kingspan Thermapitch® TP10 between (if required) and over rafters

12.5 mm plasterboard

Tiles/slate batten

Mortar infill


Timber batten

Rafter

Flying rafter

Breathable sarking membraneturned up by 50 mm (min.)

Fascia board

Cavity closer

Undercloak

Unventilated airspace



Cavity closer

TP10

17

Product DescriptionThe FacingsKingspan Thermapitch® TP10 is faced on both sides with alow emissivity composite foil facing which is highly resistant tothe transmission of water vapour. This reflective, low emissivitysurface effectively doubles the thermal resistance of the cavityin which the board is placed.

The CoreThe core of Kingspan Thermapitch® TP10is manufactured from trademarkedNilflam® technology (a high performance CFC/HCFC–freepolyisocyanurate (PIR) based formulation). KingspanThermapitch® TP10 has a typical density of 32 kg/m3.

CFC/HCFC–freeKingspan Thermapitch® TP10 is manufacturedwithout the use of CFCs/HCFCs and has zeroOzone Depletion Potential (ODP).

Product DataStandards and ApprovalsKingspan Thermapitch® TP10 is manufactured to the higheststandards in accordance with draft BS 4841–5 (Rigidpolyurethane (PUR) and polyisocyanurate (PIR) products forbuilding end–use applications. Specification for laminatedinsulation boards for pitched roofs).

Kingspan Thermapitch® TP10 is manufactured to the higheststandards under quality control systems approved to BS EN ISO 9001: 2000/I.S. EN ISO 9001: 2000 (Qualitymanagement systems. Requirements). Its use is covered byBBA Certificate 95/3126.

Standard DimensionsKingspan Thermapitch® TP10 is available in the followingstandard sizes and thicknesses:

Nominal Dimension Availability

Length (m) 2.4Width (m) 1.2Insulant Thickness (mm) Refer to local distributor or

Kingspan Insulation price list forcurrent stock and non-stock sizes.

Insulation Compressive StrengthTypically exceeds 140 kPa at 10% compression when testedto BS EN 826: 1996 (Thermal insulating products for buildingapplications. Determination of compression behaviour).

Water Vapour ResistanceModified to include board facings, the boards achieve aresistance far greater than 100 MN.s/g when tested inaccordance with BS 4370–2: 1993 (Methods of test for rigidcellular materials. Methods 7 to 9).

DurabilityIf correctly applied, Kingspan Thermapitch® TP10 has anindefinite life. Its durability depends on the supporting structureand the conditions of its use.

007

Manufactured to BS EN ISO 9001: 2000Certificate No. 388

I.S. EN ISO 9001: 2000Registration No. 19.0633

BBABRITISHBOARD OFAGRÉMENT

CERTIFICATE 95/3126

18

Thermal Properties

The λ–values–values and R–values quoted are inaccordance with the Harmonised European Standard BS EN 13165: 2001 (Thermal insulation products forbuildings – Factory made rigid polyurethane foam

(PUR) products – Specification) using so called 90/90 principles. Comparison with alternative productsmay not be appropriate unless the same procedures

have been followed.

Thermal ConductivityThe boards achieve a thermal conductivity (λ–value) of 0.022 W/m.K. (insulant thickness ≤ 30 mm) and 0.023 W/m.K(insulant thickness ≥ 35 mm).

Thermal ResistancesThermal resistance (R–value) varies with thickness and iscalculated by dividing the thickness of the board (expressed in metres) by its thermal conductivity.

Insulant Thickness Thermal Resistance(mm) (m2.K/W)

20 0.9025 1.1030 1.3540 1.7050 2.1555 2.3560 2.6065 2.8070 3.0075 3.2580 3.4590 3.9095 4.10

100 4.30105 4.55110 4.75115 5.00120 5.20125 5.40130 5.65135 5.85140 6.05145 6.30150 6.50160 6.95165 7.15175 7.60180 7.80200 8.65

Refer to local distributor or Kingspan Insulation price list for current stock and non-stock sizes.

Resistance to Solvents, Fungi & RodentsThe insulation core is resistant to short-term contact withpetrol and with most dilute acids, alkalis and mineral oils.However, it is recommended that any spills be cleaned off fullybefore the boards are installed. Ensure that safe methods ofcleaning are used, as recommended by the suppliers of thespilled liquid. The insulation core is not resistant to somesolvent-based adhesives systems, particularly those containingmethyl ethyl ketone. Adhesives containing such solventsshould not be used in association with this product. Damaged boards or boards that have been in contact withharsh solvents or acids should not be used.

Fire PerformanceKingspan Thermapitch® TP10, when subjected to BritishStandard fire tests, achieves the results given below.

Construction Result

BS 476–3: 1958 SAA rating(External fire membrane adopted exposure roof test)BS 476-7: 1997 Class 1 rating(Fire tests on building materials and structures. Method of test to determine the classification of the surface spread of flame of products)

Further details of the fire performance of Kingspan Insulationproducts may be obtained from the Kingspan InsulationTechnical Services Department (see rear cover).

TP10

19

Kingspan InsulationKingspan Insulation offers an extensive range of premium and high performance insulation products, breathablemembranes and pre–fabricated/ pre–insulated systems for theconstruction industry. Following an extensive investmentprogramme, Kingspan Insulation is continuing to lead theinsulation industry by manufacturing its insulation productswith zero Ozone Depletion Potential (ODP) and quoting thermalperformance data in accordance with the new harmonisedEuropean Standards.

Kingspan Insulation Limited specialise in the solution ofinsulation problems. The Kingspan Insulation range ofinsulation products meet the exacting requirements of theconstruction industry are produced to the highest standards,including BS EN ISO 9001: 2000/I.S. EN ISO 9001: 2000.Each product has been designed to fulfil a specific need andhas been manufactured to precise standards and tolerances.

Insulation for:● Pitched Roofs

● Flat Roofs

● Cavity Walls

● Timber and Steel Framing

● Externally Insulated Cladding Systems

● Floors

● Soffits

Solutions:● Insulated Dry Lining

● Tapered Roofing Systems

● Kingspan KoolDuct® Pre–Insulated Ducting

● Kingspan nilvent ® Breathable Membranes

The Kingspan Insulation Product RangeThe Kingspan Kooltherm® K–range● With a thermal conductivity of 0.021–0.024 W/m.K

CFC/HCFC–free rigid phenolic insulation is the mostthermally efficient insulation product commonly available.

● Utilises the thinnest possible insulation board to achieverequired U–values.

● Fire performance can be equivalent to mineral fibre.

● Achieves a Class O fire rating to the Building Regulationsand Low Risk rating for the Technical Standards in Scotland.

● Achieves the best possible rating of < 5% smokeobscuration when tested to BS 5111: Part 1: 1974.

● CFC/HCFC–free with zero Ozone Depletion Potential (ODP).

The Kingspan Therma Range● With a thermal conductivity of 0.022–0.028 W/m.K

CFC/HCFC–free rigid urethane insulation is one of the mostthermally efficient insulation products commonly available.

● Easily achieves required U–values with minimum boardthickness.

● Achieves the required fire performance for the intendedapplication.


The Kingspan Styrozone® & Purlcrete Ranges● Rigid extruded polystyrene insulation (XPS) has the highest

compressive strength of any commonly available insulant.

● Ideal for specialist applications such as inverted roofing andheavy–duty flooring.

● Easily achieves required U–values with minimum boardthickness.

● Achieves the required fire performance for the intendedapplication.


All Products● Their closed cell structure resists both moisture and water

vapour ingress – problems which can be associated withopen cell materials such as mineral fibre and which canresult in reduced thermal performance.

● Unaffected by air movement – problems that can beexperienced with mineral fibre and which can reducethermal performance.

● Safe and easy to install – non–fibrous

● Provide reliable long term thermal performance over thelifetime of the building.

Customer ServiceFor quotations, order placement and details of despatches pleasecontact the Kingspan Insulation Customer Services Department onthe numbers below:

UK – Telephone: +44 (0) 870 850 8555– Fax: +44 (0) 870 850 8666– email: [email protected]

Ireland – Telephone: +353 (0) 42 97 95000– Fax: +353 (0) 42 97 46129– email: [email protected]

Literature & SamplesKingspan Insulation produce a comprehensive range of technicalliterature for specifiers, contractors, stockists and end users. The literature contains clear ‘user friendly’ advice on typical design; design considerations; thermal properties; sitework and product data.

Available as a complete Design Manual or as individual productbrochures, Kingspan Insulation technical literature is an essentialspecification tool. For copies please contact the KingspanInsulation Marketing Department on the numbers below:



Tapered RoofingFor technical guidance, quotations, order placement and details of despatches please contact the Kingspan InsulationTapered Roofing Department on the numbers below:



Technical Advice/DesignKingspan Insulation Ltd support all of their products with acomprehensive Technical Advisory Service for specifiers, stockistsand contractors.

This includes a computer–aided service designed to give fast,accurate technical advice. Simply phone the Kingspan Insulation

with your project specification. Calculations can be carried out to provide U–values, condensation/dew pointrisk, required insulation thicknesses etc… Thereafter any numberof permutations can be provided to help you achieve your desired targets.

The Kingspan Insulation Technical Services Department can alsogive general application advice and advice on design detailing andfixing etc... Site surveys are also undertaken as appropriate.

Please contact the Kingspan Insulation Building Fabric InsulationTechnical Services Department on the numbersbelow:



General EnquiriesFor all other enquiries contact Kingspan Insulation on the numbers below:



Kingspan Insulation reserve the right to amend product specifications without prior notice.Product thicknesses shown in this document should not be taken as being available ex-stockand reference should be made to the current Kingspan Insulation price-list or advice soughtfrom Kingspan Insulation Sales Department. The information, technical details and fixinginstructions etc. included in this literature are given in good faith and apply to uses described.Recommendations for use should be verified as to the suitability and compliance with actualrequirements, specifications and any applicable laws and regulations. For other applications orconditions of use, Kingspan Insulation offers a Technical Advisory Service (see left) whoseadvice should be sought for uses of Kingspan Insulation products that are not specificallydescribed herein. Please check that your copy of the literature is current by contacting theKingspan Insulation Marketing Department (see above).

Contact Details

Kingspan Insulation LtdPembridge, Leominster, Herefordshire HR6 9LA, UK

Castleblayney, County Monaghan, Ireland

www.insulation.kingspan.com

® Kingspan, Kooltherm, KoolDuct, Nilflam, Nilvent, Styrozone, Thermapitch, the zo Device and the Lion Device are Registered Trademarks of the Kingspan Group plc

thermapitch tp10 rafter level insulation -...

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