the green book - g-framenorth american construction that is helping to deﬁne a new class of timber...

The Green BookA Guide to CLT and Glulam

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G-frame Structures LtdUnit B2, Beckerings Business Park,

Lidlington, Bedfordshire MK43 0RD

01525 288022

[email protected]

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Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4History of CLT and Glulam. . . . . . . . . . . . . . . . . . 5CLT Characteristics . . . . . . . . . . . . . . . . . . . . . . . 6CLT Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8CLT Panel Structure . . . . . . . . . . . . . . . . . . . . . . 10Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . 12Quality Description . . . . . . . . . . . . . . . . . . . . . .28Structural Solutions . . . . . . . . . . . . . . . . . . . . . . 30Span Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Connection Details. . . . . . . . . . . . . . . . . . . . . . 36Foundation Base Plate . . . . . . . . . . . . . . . . . . . .38Building with CLT . . . . . . . . . . . . . . . . . . . . . . . .40Control of Moisture . . . . . . . . . . . . . . . . . . . . . . .46Advantages of CLT . . . . . . . . . . . . . . . . . . . . . .47Building Physics . . . . . . . . . . . . . . . . . . . . . . . . 48Glulam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50J-Safe Handrail System . . . . . . . . . . . . . . . . . . . 56Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . .58Cladding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70CLT Cost Comparison . . . . . . . . . . . . . . . . . . . .76Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7810 Points Which Set G-frame Apart . . . . . . . . . . 86

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G-frame Structures is a specialist contractor delivering engineered timber buildings. Through our experience and understanding of what is requiredthroughout the whole life cycle of the building, we are able to provide the structural design and construction solutions to our clients’ architectural drawings.As a result, we are able to deliver a sustainable building from the design stageright through to completion in a cost effective and timely manner.

We are committed to designing and constructing superior buildings in various market sectors, including private dwellings, schools, residential and retaildevelopments.

As a family run business with a hands on approach, we are committed to deliveringpractical solutions within budget while maintaining and complying with the relevant legislation and code of practice standards. Our business is based onexceeding our clients’ expectations which, in turn, leads to repeat business fromour clients.

We work closely with the design team providing structural solutions as the designis developed, understanding the needs of the project and the following trades toensure that there are little or no changes made on site to the delivered projectwhere at all possible. This is an important area where we believe savings can bemade, both financially and in time for the overall benefit of the project.

With the use of 3D imaging incorporating the connection details, the method andprogramme of erection can be provided to the team. This gives them a full insightinto areas of particular sensitivity and interest.

We hope that you find this informative and beneficial for your ideas, but shouldyou have any queries, comments or indeed require any further information, please do not hesitate to contact us directly at anytime.

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Cross Laminated Timber

Cross Laminated Timber (CLT) is a relatively new building system being used inNorth American construction that is helping to define a new class of timber productsknown as massive timber.

It is a potentially cost competitive wood-based solution that complementsthe existing light frame and heavy timber options, and is a suitable candidate for some applications which currently use concrete, masonry and steel.

CLT is an innovative woodproduct that was introducedin the early 1990s in Austriaand Germany, and has been gaining popularity in residential and non-residential applications in Europe. Thereare currently over one hundred CLT plants in Europe.

In the mid-1990s, Austria undertook an industry academia joint research effortthat resulted in the development of modern CLT.

After several slow years, constructionin CLT increased significantly in theearly 2000s, partially driven by thegreen building movement, but also,due to better efficiencies, product approvals, and improved marketingand distribution channels.

Another important factor has been the perception that CLT, like masonryand concrete, is a heavy construction

system which is typical in multi-storey residential construction in many European countries.

History Of Cross Laminated Timber (CLT)

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Use

Maximum width

Maximum length

Maximum thickness

Layer structure

Wood species

Grade of lamellas

Moisture content

Bonding adhesive

Surface quality

Weight

Change in shape with change in moisture content

Fire rating

Water vapour diffusion resistance µ

Thermal conductivity λλλλ

Specific heat capacity cp

Airtightness

Service class/usability

CLT Characteristics

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Primarily as a wall, ceiling and roof panel in homes and other buildings

2.95 m

16.00 m

40 cm

Bonded, cross-laminated single-layer panels

Spruce (middle layers can contain pine; larch and pine as cover layer on request)

C24 (in accordance with the technical approval 10 % to strength class C16 allowed; other grades on request)

12% ± 2%

Formaldehyde-free adhesives for edge bonding, finger jointing and surface bonding

Non-visible quality, industrial visible quality and visible quality; the surface is always sanded

5.0 kN/m³ in accordance with DIN 1055-1:2002, for structural analyses; for ascertaining transport weight: approx. 470 kg/m³

Swelling and shrinkage in accordance with DIN 1052:2008 below the fibre saturation level:

In the panel layer: 0.02% change in length for each 1% change in timber moisture content

Perpendicular to the panel layer: 0.24% change in length for each 1% change in timber moisture content

In accordance with Commission Decision 2003/43/EC:

Timber components apart from floors Eu roclass D-s2, d0

Floors Euroclass Dfl-s1

According to EN 12524 20 to 50

According to the SP Technical Research Institute of Sweden’s expert opinion of 10.07.2009 .11 W/(mK)

According to EN 12524 1600 j/(kgK)

CLT panels are made of single-layer panels and are therefore extremely airtight. The airtightness of a 3-layer CLT panel and of panel joints has been tested to EN 12 114 where it was found that that the volumetric rates of flow were outside the measurable range.

According to EN 1995-1-1, can be used in service classes 1 and 2

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CLT Standard Designs

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Panel Structure

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CLT solid wood panels are made up of bonded single layerpanels arranged at right angles to one another.

The maximum production width is 2.95 m and the maximumproduction length 16.00 m.

Example: structure of a 5-layer CLT solid wood panel

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CLT Surface Quality

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Quality Descriptions

There are three different CLT single-layer panel qualities

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Furness Partnership was established in 1986, and since then has developed aportfolio of award winning and highly commended work. The practice operatesout of its two design offices in central London and Bradford, and employs over35 staff. We are able to undertake work throughout Europe and have completedprojects in the Middle East.

We carry out a broad range of projects, varied in both scope and scale, and havea proven track record in most principal sectors including: sport and leisure, education, commercial offices, hotels, residential, cultural, public, and alsorestoration of historic buildings.

The firm has an established client base including many private clients and organisations, and also many public bodies such as Local Authorities, Universities and Schools.

We model projects in 3D, and use the latest BIM software which is fully integratedwith our analysis, design and detailing packages ensuring that efficient and accurate design information for even the most complicated projects can be produced and communicated to the project team with simplicity and ease.

We have experienced staff and a proactive approach to structural engineering,believing that an early engagement with all members of the team and a holisticapproach to building design results in better buildings.

Structural Solutions

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Our Approach

On all our projects Furness Partnership believes it should engage early with allproject team members and stake holders to ensure that we can be immersed inthe needs of the project. This means that we can offer early strategic advice inorder to maximise design opportunities and highlight and reduce risks.

We ensure that our projects are resourced with senior staff who can offer their experience whilst ensuring that all the project specific requirements are understood, and the implications communicated.

Value Engineering Process

We have a breadth of experience of working with knowledgeable clients who expect best value solutions, whilst expecting the project aspirations of quality,sustainability and functionality to be maintained and delivered. Our approach is to ensure that key strategic decisions are made collectively, and that conceptsand strategies are considered early in the design process with the full implications being communicated and discussed by the Project Team to ensurethat best value is being ‘designed in’.

We are active participants of the external Value Engineering workshops, which we would anticipate being held at all key project stages, and, in addition,we hold our own internal design workshops which consider value as well as design adequacy.

It is our experience with buildings where value has been built in and consideredat a sufficiently early stage, the projects benefit significantly over those wherevalue engineering has been a retrospective exercise, with the inevitable reductionin quality.

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Furness Partnership have developed a specialist expertise in timber engineering. This has evolved into the use of Cross Laminated Timber (CLT) panels on numerous schools. Cross Laminated Timber is an engineered timberproduct with good structural properties and low environmental impact.

We have developed relationships with factories in Central Europe and throughthe use of 3D modelling, we are able to relate directly to the factory software thusshortening the lead time for production versus standard construction techniques.

The installation of this material requires only limited new site skills, and its lowweight means the cost of foundations can be reduced.

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This award winning leisure centre comprises of a 6 lane 25m pool with a spectator area, a learner pool, 4 court sports hall, a health and fitness suit andstudio spaces.

The leisure centre won the silver Green Apple award; it also won the Community Benefit category in the Engineering Excellence Awards. The centre also won a Local Authority Building Control (LABC) Building Excellence Award for bestsmall commercial building and was a finalist in the LABC’s Best Sustainability inDesign category.

Horley Leisure Centre

The project included a new leisure centre with two swimming pools, fitness/healthsuite, café and ancillary accommodation. Furness Partnership completed initialsurveys, feasibility design and tender to construction, design of substructure, superstructure, external works and drainage.

Key aspects of the project include the retention and refurbishment of the historiclandmark tower building, demolition of adjacent leisure facilities and intergationof new leisure centre. Coordination was required between the client, English Heritage and the design/construction team.

Victoria Leisure Centre, Nottingham

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CLT floor span (m)(double span)

Floor used in

education building

Floor used inresidential building

3m 90L3 – CLT floor 90mm thick

80L3 – CLT floor 80mm thick





CLT - Span Chart

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Glulam beam(m)

Grade GL24(h)

Beams used in education building

Centres 6m span 7m span 8m span

3m 220mmx 400mm dp 220mmx 480mm dp 220mmx 560mm dp

4m 220mmx 480mm dp 220mmx 560mm dp 220mmx 560mm dp**

5m 220mmx 560mm dp 220mmx 560mm dp** 220mmx 640mm dp**

**Composite action with CLT floor assumed

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CLT Connection details

CLT wall board

Bonding with suitable air tight tape

Adhesive line

Screw connection(according to structural analysis)

• As an alternative to achieve the required airtightness in a building, the jointsof the CLT boards with the exception of the adhesive line, can be sealed withsuitable adhesive tape on the inside and outside of the boards.

• The choice and rating of the connectors and all structural components dependon the structural requirements.

• The screw connection at the corner joint must be made either purely constructionally (screw at 90°) or in a structurally effective way (slanted end-grain screwing).

Corner Junction Detail

Adhesive line

Screw connection(according to structural analysis)

CLT wall board

• If the individual rooms in the building are required to be airtight, the joints of the CLT boards must be sealed with joint-sealing tape.

• The choice and rating of the connectors and all structural components depend on the structural requirements.

• The screw connection at the T-joint must be made either purely constructionally(screw at 90°) or in a structurally effective way (slanted end-grain screwing).

Wall Junctions Detail

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CLT wall board

Adhesive line

Connection to wall board (nails, screws, staples) according to structural analysis

18mm Cleat board

• When external butt boards are used (e.g. 3-layer plate or laminated veneerlumber), the subsequent layer structure must be adapted to them.

• Joint-sealing tape must be used to make the structure airtight.

• The choice and rating of the connectors and all structural components dependon the structural requirements.

• With this type of CLT wall board connection in particular, the danger of buckling must be taken into account.

• The joint can also be adhesively bonded to enhance its rigidity.

Exterior Wall Cleat Connection Detail

480mm x 200mm Glulam beam

Half lap joint

Run of adhesive

120mm CLT floor

220mm x 8mm Spax T-Star

• Joint-sealing tape must be used if necessary to make the connection airtight.

• The design must provide sufficient clearance, depending on the installationsituation.

• The choice and rating of the connectors and all structural components depend on the structural requirements.

• Depending on the static system, fully threaded screws must be used in orderto secure effective lateral force connections at the joint and the point of support.

CLT Floor to Glulam Beam Joint Detail

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Foundation Base Plate connection to CLT walls

Connection from the concrete structure to the CLT walls would be by means ofour designed connection and levelling base plate.

Our plate has been used successfully on all of our projects to date and we havefound it, not only time saving, but also helps in the erection stage to keep the bottom of the CLT as dry as possible.

Base plate and levelling shims are galvanized and can be connected by up to four 12mm bolt; two are adjustable and two are locking.

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CLT provides:

• Energy efficiency – Heating cost – Comfort

Building with CLT panels - priorities:

– Prevent rain exposure during transportation and on constructionsite

– Prevent rain intrusion during building service – building envelope leaks and direct exposure of CLT elements

– Drying ability and condensation prevention

Building with CLT:

– Flexible (styles, dimensions, design)

– Performance (security, durability, fire resistance)

– Energy efficient – Environmental friendly – Quick and economic

construction

Building with CLT panels:

– Utilisation of CLT panels should notchange the heat, air and moisturecontrol design criteria

– Understanding of the heat, air andmoisture management processes in the building envelope using CLT panels is necessary

…and will lead to best practices

• Durability – Lifetime – Easy maintenance

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Airtightness

Evaluation during construction – no tool available

Evaluation after construction

– Infrared thermography – Infiltrometry evaluation

(blower door setup) – Determination of airtightness with a pressure differential of 50Pa

Airtightness

• Exfiltration due to 𝚫P – Stack effect – Wind – Unbalanced mechanical

systems • Conception methods

– Continuous air-barrier – Be careful with junctions

between components

Heat flow control

Heat flow control is achieved using insulation CLT panels that require appropriateinterior or exterior insulation boards, such as

– Wood-fibre board – Rigid mineral-fibreboard insulation – Extruded or expanded polystyrene (low vapour permeability, which can reduce

the drying capacity of the CLT panel) – semi-rigid fibreglass or mineralwool boards(vapour-permeable but require additional framing for cladding attachment);CLT can offer a certain level of insulation

The position and type of insulation may affect the moisture levels and durability of wood panel.

Exterior insulation will keep the wood at a relatively constant warm and dry indoor environment.

CLT panels have aesthetic benefits and could be left exposed to the interiorwhen fire safety requirements allow.

Rain infiltration

• Rain screen design • Drainage • Roof, gutters, flashing • Wall/window assemblies • Awareness of junctions.

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Heat flow control

Exterior rigid or semi-rigid insulation

Air flow control

Air infiltration or exfiltration is controlled through enclosure assemblies andachieves the following:

– Prevents condensation – Minimizes space-heat energy loss or unwanted heat gain. CLT panels

may provide a high level of airtightness – Continuity of airtightness between panels and other components

as is required

Cycles of drying and wetting may consequently reduce airtightness of the product

CLT panels cannot be relied on for airtightness on most panels. However, withedge glued 5ply no secondary continuous air-barrier system would be necessaryfor the following reasons:

– Weather resistant barrier (adhered or fastened)

– Drywall layer (interior side of the panel) – Air-barrier rely on transitions between the continuous system and openings

– Doors and windows – Transitions to floor, ceilings,

balconies, decks, roofs, etc. Details are set out in the G-frame construction details

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Vapour flow control

Vapour diffusion must be controlled to prevent interstitial condensation. Vapour control is provided on the warm side (driving force)

Water vapour must not get entrapped100mm thick; CLT panels have a vapourpresence of less than 30 ng/P.a.s.m2 at normal indoor RT level

Rain water and exterior moisture control

Rain water management is critical to the long-term performance of wood wall assemblies. We achieve this with:

– Steep roofs – Overhangs

The best control strategy is the use of a drained and ventilated rain screen cladding.

Weather resistant barriers (WRB) will be mechanically fastened or adhered. The WRB should have a high vapour presence.

Rain water and exterior moisture control

Best practice rainwater management (fromwall design guideline) is gained through:

Ventilated and drained cladding primary andsecondary drainage planes in addition to ventilation behind the cladding;

Typically used exterior insulated rain screen type wall assemblies

Vertical furring screwed through rigid insulation boards using long screws

100x50 or 150x50 vertical framing attached to CLT panels using metal clips.

Insulation retained betweenframing using metal clips.

Or adjustable two part fixing screws

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Detailing considerations - Installation of windows

Installation of windows in a CLT wall system varies from traditional practice; CLT liner built around window rough opening to support window frame andcovered with a waterproofing membrane.

Window is air-sealed around the interior perimeter of the frame as part of the air-barrier assembly

The waterproofing membrane at sill for window frame drainage overlaps theexterior of the insulation by approximately 100mm. (Water is not directed to the CLT beneath the window).

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Detailing considerations – At grade

CLT panels must be protected frommoisture at grade

Mesh at top and bottom of rainscreen cavity to prevent insect and pest intrusion Insulation below grade will typically

consist of extruded polystyrene (XPS)

Strip of waterproofing membrane and shims between CLT panel and concrete foundation. Air-seal joint between CLT panel and waterproofing

Minimum of 200mm between outer lower leveland bottom of CLT

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Control of moisture during construction

• CLT panels must be protected frommoisture during the constructionprocess.for example:

– Rain – Snow – Wet ground, etc.

• CLT panels can absorb a large quantity of water

• CLT panels can take more time to dry out

• Prevention of wetting should be a priority

• Water protection can be installed with the CLT to prevent water being absorbed

• Cycles of wetting and drying maydamage the panels and lead to distortion or dimensional changes

• It is as important to protect the CLT against sun light as well aswater on exposed panels

Wood treatment for durability

• Exterior exposed portion of panelscould benefit from wood preservativetreatment, protecting them from wetter or more humid climates

• Treatment for furring and framing is recommended

• The long term performance of any building is dependent on the conditions under which materials are submitted

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Advantages of CLT

• Value engineering of the foundations: CLT / Glulam buildings are only 450kgs per m³ dead load, whereas steel is 7,850kgs per m³ dead load.

• A CLT / Glulam building will give you all the walls and floor under one erection programme bringing forward the watertight date.

• Cold bridging with CLT buildings is 96% better than a steel frame building.

• The lifetime energy use of a CLT / Glulam building is less.

• SAP reports will be better, thereby reducing heating requirements.

• E.P.C. will be better.

• The insulation costs less with a CLT / Glulam building. 120mm CLT will give 0.13 UV and 52DBA which would be another costing you need to add to a steel frame.

• Second phase fixings will be slower and more costly with a steel frame building.

• A CLT building will be dimensionally correct, and all other second phasefitments can therefore be ordered from the structural drawings.

• Details of all fixings for the second phase fix will be supplied as part of the package.

• There is no site waste giving further savings, and reducing the carbon footprint even more.

• CLT can be left exposed, saving on wall and ceiling finishes.

• CLT will give you a 30 minute fire protection and can give up to 90 minutes if required.

• Air tightness of a CLT / Glulam building will be two or less, whereas steelwould be around 8 to 10.

• There will be less transport to site for the same size project.

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GlulamHistory Of Glulam

Although Glulam is mainly considered to have started in the ship build industrysometime in the 1800s, it found its way in to the construction of large buildings.

One of the earliest still-standing Glulam roof structures is generally acknowledged to be the assembly room of King Edward VI College, a school inBugle Street, Southampton, England, dating from 1866, designed by JosiahGeorge Poole. The building is now the Marriage Room of Southampton RegisterOffice.

Two churches in Northumberland are now thought to have the earliest extantuses: Holy Trinity, Cambo (1842), and Holy Trinity, Horsley (1844); four 1850sMerseyside churches also feature laminated timbers: St Mary, Grassendale,St Luke, Formby, St Paul, Tranmere and Holy Trinity, Parr Mount and St Helens.

The first industrial patented use was in Weimar, Germany. Here in 1872 Otto Hetzer set up a steam sawmill and carpentry business in Kohlstrasse. Beginning in 1892, he took out a series of patents. DRP No. 63018 was for a ventilated timber floor deck that could be tightened laterally after installation, to compensate for shrinkage. Hetzer continued to patent various ingenious systems,but the first of these that could be compared with subsequently standardised horizontal Glulam was DRP No. 197773, dated 1906.

This entailed vertical columns which transitioned into curved glued laminated eaves zones, and then became sloped rafters, all in a single laminatedunit. Each component, bonded under pressure, comprised three or more horizontally arranged laminations.

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Glulam construction

Glulam frames can be used in the same way as another frame steel or concrete.

Glulam support frames are quick to procure and erect. The light weight meansthe foundation can be reduced and off site manufacture in to components is an option. Outer cladding can be installed as the frame is erected; this can be anytype of cladding from light weight rain screen to brickwork. All types of floors can be used, even light weight concrete.

Glulam frames have real advantages over most other types of construction frames from drawings to site, and are now beingused in the housing and student accommodation sector because of theshorter procurement times.

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UNIT SIZES: STOCK BEAMS 12 METER

Glulam sizes

• Strength class GL 24/BS 11 (german standard)

• 40mm Lamella, nordic Spruce

• Produced according to EN14080/DIN1052

• Melamine glue (light )S4S, eased edges

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Glulam - Joist Beam Holder

• The design must provide sufficient clearance, dependingon the installation situation.

• The choice and rating of the connectors and all structuralcomponents depend on thestructural requirements.

Glulam - Roof Connection

• If the roof structure is suitably designed and the layers are configured in the right order(with their permeabilityincreasing from inside to outside), a vapour barrier may be omitted.


• Layer structures must bematched to the required structural physical properties of the design.

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• A suitable adhesive tape (jointbonding) must be used if necessary to make the structure airtight.

• The design must provide sufficient clearance, depending on the installation situation.

• The choice and rating of theconnectors and all structuralcomponents depend on thestructural requirements.

• If necessary, the support surface in the wall board must be reinforced with ametal plate and fully threaded screws (pressure).


• The choice and rating of theconnectors and all structuralcomponents depend on thestructural requirements.

Joist (wall cut out)

Joist (Column)

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• Appropriate beam holdersmust be used which correspond to the dimensions of the joists.

Joist (Hanger)

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Working with J-SAFE we have developed a Temporary Edge Protection Systemthat has been successfully used to provide a collective guardrail environment forthe erectors of engineered timber framed structures.

Panels are factory manufactured for internal and external walls which, when delivered to site, are connected to form buildings, typically hotels, schools, residential or student accommodations.

Timber Structures are fast to erect on site, and consistent quality is guaranteeddue to the off-site facilities in which they are manufactured.

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The J-SAFE system is fast, safe and easy to install, usually from MEWPs ontoerected walls, but can be designed to install onto the panels before they are liftedinto position.

There are only two components: pre-assembled Post Assemblies to suit floorthicknesses which support the J-SAFE mesh guardrail barrier.

Once installed, the J-SAFE System provides a continuous guardrail system for progressive storey lifts, greatly reducing the risk of the installers falling from height.

The J-SAFE System is compliant with BS EN 13374 Class A; instructional, anddemonstration support is provided.

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Connection Screws for CLT and Glulam Frames

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Connections

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Profiled timber claddings

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TREMOLO

by PIVETEAUBOIS

ADVANTAGES: a vibration that brings life to your facadesTIMBER SPECIES : Douglas Fir (From France)EFFECTIVE WIDTH : 110 mmTHICKNESS : 22 mm

Douglas fir brown, Cl.3b, 10-YEAR Guarantee

above ground

Douglas fir grey, Cl. 3b,10-YEAR Guarantee

above ground

Douglas firsapwood-free, Cl. 3b

FEATURES

Timber species : Douglas firTechnique : solid timberVisual appearance grading (NF EN 1611-1) : 1Surface finish : planed, brushedFinish : none (brown or grey-pigmented impregnation)Certification: CE marking according to the NF EN 14915 standard; CTB B+ certificate for autoclave impregnationUse class : CL3b by autoclave impregnation or sapwood-free(1) Fire-resistance rating : M3 (according to French regulation DTU 88) – Ds2d0 Eu-roclassMoisture content : kiln-dried before impregnation, air-dried after impregnationDurability : resistant to termites, rot and wood-boring insectsWeight per unit area : 11 kg / m²Lengths : 2,50 / 4,00 m – Other lengths on request. Tongue & Groove endsCompliance : NF EN 14519 StandardOptions on request : sapwood-free(1) Douglas Fir

(1) Douglas fir heartwood is naturallydurable, but must be given a finishing coat to protect it against contact with water thereby preventing surface mould from developing.

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LARGO

by PIVETEAUBOIS

ADVANTAGES : new generation longlasting finishesTIMBER SPECIES : Douglas Fir (From France)EFFECTIVE WIDTH : 200 mmTHICKNESS : 25 mm


above ground


above ground

FEATURES

Timber species : Douglas firTechnique : glulam (22 mm thick lamella)Visual appearance grading (NF EN 1611-1) : 1Surface finish : finely sawnFinish : none (brown or grey-pigmented impregnation)Certification : CTB B+ certificate for autoclave impregnationUse class : CL3b by autoclave impregnation Fire-resistance rating : M3 (according to French regulation DTU 88) – Ds2d0 EuroclassDurability : resistant to termites, rot and wood-boring insectsWeight per unit area : 13 kg / m²Lengths : From 2,00 to 5,00 m depending on availability. Tongue & Groove endsCompliance : NF EN 14519 StandardOptions on request : Bespoke colours available depending on quantityBespoke lengths

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PULSO

by PIVETEAUBOIS

ADVANTAGES : the new size for open joint cladding in colourTIMBER SPECIES : Douglas Fir (From France)EFFECTIVE WIDTH : 155 mm

THICKNESS : 34 mmFEATURES

Timber species : Douglas firTechnique : solid timber, finger jointedVisual appearance grading (NF EN 1611-1) : 1Surface finish : planed, brushedFinish : none (brown or grey-pigmented impregnation)Certification : CE marking according to the NF EN 14915 standard; CTB B+ cer-tificate for autoclave impregnationUse class : CL3b by autoclave impregnation or sapwood-free(1) Fire-resistance rating : M3 (according to French regulation DTU 88) – Ds2d0 Eu-roclassMoisture content : kiln-dried before impregnation, air-dried after impregnationDurability : resistant to termites, rot and wood-boring insectsWeight per unit area : 16 kg / m²Lengths : 2,50 / 4,00 m – Other lengths on request. Compliance : NF EN 14519 StandardOptions on request : sapwood-free(1) Douglas Fir



above ground


above ground


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MEZZO

by PIVETEAUBOIS

ADVANTAGES : the elegance of a discreet profileTIMBER SPECIES : Douglas Fir (From France)EFFECTIVE WIDTH : 125 mm


above ground


above ground


THICKNESS : 21 mmFEATURES

Timber species : Douglas firTechnique : solid timber, finger jointedVisual appearance grading (NF EN 1611-1) : 1Surface finish : planed, brushedFinish : none (brown or grey-pigmented impregnation)Certification : CE marking according to the NF EN 14915 standard; CTB B+ cer-tificate for autoclave impregnationUse class : CL3b by autoclave impregnation or sapwood-free(1) Fire-resistance rating : M3 (according to French regulation DTU 88) – Ds2d0 Eu-roclassMoisture content : kiln-dried before impregnation, air-dried after impregnationDurability : resistant to termites, rot and wood-boring insectsWeight per unit area : 11 kg / m²Lengths : 2,50 / 4,00 m – Other lengths on request. Tongue & Groove endsCompliance : NF EN 14519 StandardOptions on request : sapwood-free(1) Douglas Fir


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WEXSIDE

by PIVETEAUBOIS

ADVANTAGES: Hidden fixingsRecyclable productLong lasting finish (15 years)

Timber Species: Wood-Polymer composite 2/3 wood 1/3 polymer

TIMBER SPECIES : 190 mm for faster installationTHICKNESS: 8 mm

FEATURESSurface finish: - structured finish - acrylic stain- invisible fixings

Length: 4.00 m

Weight per unit area: 12kg/m2

Installation: easy and time-saving installation thanks to an innovative invisibleclipping system:- cladding clips fixed on a roll for fast alignment and fixing of clips- cladding clips pre-fixed on support battens for easy fixing of cladding on to theclips- flat front-face cladding with discreet 3 mm shadowline joint

Fire resistance rating: awaiting M3 certification

Durability: resistant to termites, rot and wood-boring insects

Options on request:Bespoke lengthsBespoke colours depending on quantity

Requirements for 1 m2 of Wexside*:- 6.00 linear meter of cladding- 3.00 linear meter of battens and 1 roll of clips or- 3.00 linear meter of battens with pre-fixed clips

* 10% waste included

Acrylic stainAnthracite GreyWhiteIvoryLight GreyPastel BlueRed-Brown

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• When carrying out a price comparison with other construction methods thesesavings need to be taken into consideration:

• Value engineering of the foundations - CLT / Glulam buildings are only 450kgsper m³ dead load whereas steel is 7,850kgs per m³ dead load.

• A CLT / Glulam building will give you all the walls, floors and roof under one erection programme bringing forward the watertight date.

• Cold bridging with CLT buildings is 96% better than a steel frame building.

• The lifetime energy use of the CLT / Glulam building is less. One tonne of carbon is stored for every metre cubed of timber used.

• SAP reports will be better thereby reducing heating requirements.

• E.P.C. will be better.

• The insulation costs less with a CLT / Glulam building. 120mm CLT will give 0.13 UV and 52DBA which will be another costing you need to add to asteel frame.

• Second phase fixings will be slower and more costly with a steel, block, concrete frame building.

CLT cost camparison with other construction methods

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• CLT requires no diamond drilling.

• A CLT building will be dimensionally correct, and all other second phase fitments can therefore be ordered from the structural drawings.

• Details of all fixings for the second phase fix will be supplied as part of the package.

• There is no site waste giving further savings on skips etc.

• CLT can be left exposed saving on wall and ceiling finishes.

• CLT will give you a minimum of 30 minutes fire protection and can give up to90 minutes if required.

• Air tightness of a CLT / Glulam building will be 2 or less, whereas steel will bearound 8 to10.

• There will be less transport to site for the same size project.

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Projects

North Beckton Primary School

G-frame constructed a new two storey CLT classroom block containing twelveclassrooms and a special needs room. There are also two large communal areasand smaller group rooms. A roof terrace provides outdoor space for the first floor.The CLT ceilings in the classrooms are left exposed giving the building a warmand welcoming feeling.

A polycarbonate canopy on a steel framework links the new block to the existing school.

Type of Project: EducationLocation: London Borough of Newham, UKClient: London Borough of NewhamArchitect: Walters & Cohen / Pick EverardMain Contractor: Neilcott ConstructionTimber Engineering & Construction: G-frame StructuresCLT Supplier: Stora Enso Glulam Supplier: Holzwerke Bullinger Area: 1300m²Project Duration: 5 weeks

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St Stephens Primary School

G-frame constructed a new two storey classroom block for St Stephens PrimarySchool including six new classrooms, office space, toilet facilities and ancillary rooms. The dining hall has also been extended with the addition of new crèche facilities.

A roof terrace provides outdoor space for the first floor.

Type of Project: EducationLocation: London Borough of Newham, UKClient: London Borough of NewhamArchitect: Rivington Street Studio & Pick EverardMain Contractor: Neilcott ConstructionTimber Engineering & Construction: G-frame StructuresCLT Supplier: Stora Enso Glulam Supplier: Holzwerke Bullinger Area: 900m²Project Duration: 4 weeks

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Roman Road Primary School

G-frame constructed a major extension for Roman Road Primary School consistingof three new CLT blocks comprising a hall and entrance block, a new teachingblock and areception and library building.

The landscaping at this inner city school will be enhanced by increased plantingto encourage biodiversity. Outdoor play space and landscaped courtyardscomplete the new scheme.

Type of Project: EducationLocation: London Borough of Newham, UKClient: London Borough of NewhamArchitect: Maccreanor LavingtonMain Contractor: Neilcott ConstructionTimber Engineering & Construction: G-frame StructuresCLT Supplier: Stora EnsoGlulam Supplier: Holzwerke BullingerArea: 2100m²Project Duration: 8 weeks

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Graveney Secondary School

The new building to the rear of the school provides valuable extra teaching, studyand events spaces for sixth form students and makes a positive contribution toGraveney’s campus - a host of fine architectural buildings.

The funding rules meant the building had to be delivered on a tight schedule andbudget, with a target cost per m2 way below current guidelines.

The 800m2 building includes eight classrooms and a double-height, independentstudy space with balconies and a gallery, 80% of all internal walls were left visual; this is what shaped the building and added character.

Type of Project: EducationLocation: London Borough of Wandsworth, UKClient: Graveney TrustArchitect: Urban ProjectsMain Contractor: Ashe ConstructionTimber Engineering & Construction: G-frame StructuresCLT Supplier: Stora EnsoGlulam Supplier: Holzwerke BullingerArea: 800m²Project Duration: 5 weeks

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Ten points which set G-frame apart from other contractors?

1 Our award winning structural design team is one of the mostinnovative in CLT and Glulam structures and has been working closely with G-Frame from 2008.

2 Shortened procurement time through design and erection.

3 Procurement times of less than ten weeks has beenachieved.

4 G-frame design solutions give further savings on waste.

5 G-frame use the highest grade of CLT panels on the markettoday.

6 We use our own designed and manufactured connectionplates.

7 All panels are half-lap jointed with a glue line to protect from moisture while in construction and total eliminate passageof air.

8 Application of a spray coating stops the absorption of moisture in the construction phase.

9 Trained erection teams supported by our own in houseCrane options give us total control from unload to install.

10 We can offer a full hybrid frame from the ground up, includingR C support works to podium level and the interphase intothe lightweight CLT structure.

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With Thanks to

Furness Partnership

Storaenso

Holzwerke Bullinger

Rothoblaas

G-frame 2015

Piveteaubois

G-frame Structures Ltd

Unit B2, Beckerings Business Park, Lidlington,

Bedfordshire MK43 0RD

01525 288022

5b Firth RoadHoustoun Industrial Estate

LivingstonWest Lothian

EH54 5DJ

GrowtownBarntown

Co WexfordIreland

[email protected]

the green book - g-framenorth american construction that is helping to deﬁne a new class of timber...

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