4/10/2012

1

How to Properly Insulate a SlabHowtoProperlyInsulateaSlabPresentedby:MikeTurns,AssociateDirector,PHRC

Tuesday,April10,2012 1:00PM

4www.enrg.psu.edu/phrc

Slabedgeinsulationisoneofthe most abused details inthemostabuseddetailsinconstruction.

DavidHales,BuildingScienceProfessorattheUniversityofWashington

5

4/10/2012

2

Typical2story,2,000SFhousewithR10perimeterslabinsulation

HeatLossthroughanInsulatedSlab

Windows33%

Roof/Ceiling8%

Slab15%

6

Doors5%

Walls39%

InsulationandFenestrationCriteriaTable402.1.1

InsulationandFenestrationRequirementsbyComponenta

CLIMATE ZONE

FENESTRATION U-FACTORb

SKYLIGHTb U-FACTOR

GLAZED FENESTRATIONb,e

SHGC

CEILING R-VALUE

WOOD FRAME WALL

R-VALUE

MASS WALL

R-VALUEi

FLOOR R-

VALUE

BASEMENTc WALL

R-VALUE

SLABd R-VALUE & DEPTH

CRAWL SPACEc

WALL R VALUE

E402.1.1

R-VALUE

1 1.20 0.75 0.30 30 13 3 / 4 13 0 0 0 2 0.65j 0.75 0.30 30 13 4 / 6 13 0 0 0 3 0.50j 0.65 0.30 30 13 5 / 8 19 5 / 13f 0 5 / 13

4 except Marine

0.35 0.60 NR 38 13 5 / 10 19 10 / 13 10, 2ft 10 / 13

5 and Marine 4

0.35 0.60 NR 38 20 or 13+5h 13 / 17 30g 10 / 13 10, 2 ft 10 / 13

6 0.35 0.60 NR 49 20 or 13+5h 15 / 19 30g 15 / 19 10, 4 ft 10 / 13 7 and 8 0.35 0.60 NR 49 21 19 / 21 38g 15 / 19 10, 4 ft 10 / 13

7

a.Rvaluesareminimums,UfactorsandSHGCaremaximums,R19batts compressedintoanominal2x6framingcavitysuchthattheRvalueisreducedbyR1ormoreshallbemarkedwiththecompressedbatt RvalueinadditiontothefullthicknessRvalue.b. ThefenestrationUfactorcolumnexcludesskylights.TheSHGCcolumnappliestoallglazedfenestration.c. 15/19meansR15continuousinsulatedsheathingontheinteriororexteriorofthehomeorR19cavityinsulationattheinteriorofthebasementwall.15/19shallbepermittedtobemetwithR13cavityinsulationontheinteriorofthebasementwallplusR5continuousinsulatedsheathingontheinteriororexteriorof thehome.10/13meansR10continuousinsulatedsheathingontheinteriororexteriorofthehomeorR13cavityinsulationattheinteriorofthebasementwall.d. R5shallbeaddedtotherequiredslabedgeRvaluesforheatedslabs.Insulationdepthshallbethedepthofthefootingor2feet,whicheverislessinZones1through3forheatedslabs.e. TherearenoSHGCrequirementsintheMarineZone.f. BasementwallinsulationisnotrequiredinwarmhumidlocationsasdefinedbyFigure301.1andTable301.1.g. Orinsulationsufficienttofilltheframingcavity,R19minimum.h. 13+5meansR13cavityinsulationplusR5insulatedsheathing.Ifstructuralsheathingcovers25percentorlessoftheexterior,insulatingsheathingisnotrequiredwherestructuralsheathingisused.Ifstructuralsheathingcoversmorethan25percentofexterior,structuralsheathingshallbesupplementedwithinsulatedsheathingofatleastR2.i. ThesecondRvalueapplieswhenmorethanhalftheinsulationisontheinteriorofthemasswall.j. ForimpactratedfenestrationcomplyingwithSectionR301.2.1.2oftheIRC orSection1608.1.2oftheIBC,maximumUfactorshallbe0.75inZone2and0.65inZone3.

4/10/2012

3

ClimateZonesE301.1

6

5

8

4

SlabRValue

Table402.1.1InsulationandFenestrationRequirementsbyComponent

E402.1.1

Climate Zone SlabRvalued

4 10,2ft

5 10, 2ft

6 10, 4ft

9

d.R5shallbeaddedforheatedslabs

Heatedslab:slabongradeconstructioninwhichtheheatingelementsareincontactwith,orplacedwithinorundertheslab

E202

4/10/2012

4

HeatedSlab

HydronicTubingHydronictubingorotherheatingelements

SlabEdgeInsulationSlabEdgeInsulation

10

R15RequiredpertheIRCandIECC

TypicalRvalueperinch InchesforR10 InchesforR15

ExpandedPolystyrene 4.0 2.5 3.75

Whatmaterialscanbeused?

ExtrudedPolystyrene 5.0 2.0 3.0

Polyisocyanurate 6.5 1.5 2.3

11

ExpandedPolystyrene(EPS) ExtrudedPolystyrene(XPS) Polyisocyanurate(ISO)

Checkwithmanufacturerforapprovalforgroundcontact

4/10/2012

5

Floorsurfaceslessthan12inchesbelowgradeshallbeinsulated

WhenIsSlabInsulationRequired?E402.2.8

12"

ConditionedSpace

12

13

4/10/2012

6

14

Note:RequirementsforslabconstructionarefoundinIRCSectionR506

Insulationshallextenddownwardfromthetopoftheslaboutsideorinside

HowShouldSlabInsulationBeInstalled?E402.2.8

15

4/10/2012

7

Slabedgemayberesponsibleforabout60%oftheslabstotalheatloss(Certainteed)

/

EffectofSlabEdgeInsulation

REM/Designsimulations 8%increaseintotalheatingconsumptionwithnoslabedgeinsulation

62%ofheatlossthroughslabedge

16

InsulationlocatedbelowgradeshallbeextendedthedistanceprovidedinTable402.1.1

DistanceBelowGradeE402.2.8

Climatezones45:2ft Climatezone6:4ft

17

4/10/2012

8

IncorrectSlabInsulationDetail

18

19

Willtherebeathermalbreak?

4/10/2012

9

20

CorrectSlabInsulationDetail

21

4/10/2012

10

AProblemwith2InchSlabEdgeInsulation

Foundation

FoamInsulation

Slab

23

FloatingSlab

Thetopedgeoftheinsulationmaybecutata45degreeangle

E402.2.8

24

Isthisagoodidea?

4/10/2012

11

PAAlternativeDetail

1/2inch thermal break1/2 inchthermalbreak

Thermal break materials:

25

Thermalbreakmaterials:

Asphaltimpregnatedfiberboard

Extrudedpolystyrene

Other

Note:AnenergyenhancementoptionmustbechosenperPA104.

UseIECCSection405:SimulatedPerformanceAlternative

S ft d li ( REM/D i

UsingthePerformancePath

Softwaremodeling(e.g.REM/Design,EnergyGuage USA)

Energycostofproposedhomemustbethereferencehome

Includes: Building orientationBuildingorientation Airinfiltrationrate Rvalues Etc.

26

4/10/2012

12

27

DetailstoAchieveFullPerimeterInsulation

28

4/10/2012

13

Cantileveredsillplate

29

Checkwithanengineer

Source:JoeLstiburek,BuildersGuides

30Source:FundamentalsofResidentialConstruction

4/10/2012

14

UseFlooringotherthanCarpet

31Source:FundamentalsofResidentialConstruction

EXTERIORFOUNDATIONINSULATION

32

4/10/2012

15

ExteriorFoundationInsulation

; ; ;

33

(a) Cold-Bridge ThroughBrick Veneer and Correction

(b) Cold-Bridge ThroughBasement Wall and Correction

(c) Cold-Bridge ThroughExposed Foundation Wall

and Correction

Insulationnotrequiredonthehorizontalportionofthefoundationthatsupportsamasonryveneer

MasonryVeneerE402.2.10

34

4/10/2012

16

35

36

4/10/2012

17

ExteriorinsulationrequiredMonolithicSlab

37Source:FundamentalsofResidentialConstruction

Slabedgeinsulationnotrequiredinareasdesignatedbythecodeofficialashavingveryheavytermiteinfestation

TermitesE402.2.8

infestation

38

4/10/2012

18

TermiteShields

39

TermiteShields

40

4/10/2012

19

Termites ChemicalTreatments

41

Exteriorfoundationinsulationshallhavearigid,opaqueandweatherresistantprotectivecovering

ProtectionofExposedFoundationInsulationE303.2.1

covering Coveringshallextend6belowgrade

42

4/10/2012

20

ProtectionConsiderations

43

1. Pressuretreatedplywood

InsulationProtectionOptions

2. Fibercementpanelsiding

3. Cementitious coating(stucco) eitherreinforcedwithfiber,,orinstalledoverfiberglassmesh,orinstalledovermetallath.

44

4/10/2012

21

1. InsulCapvinylcoveringfromWisconsinPouredWallProducts

2. GroundBreakerfiberglasscoveringfromNudo Products

ProprietaryProductsAAdvisor

3. InsulGuard2fiberglasscoveringfromDiversifiedComposites

4. Surfacebondingcement

5. PermaBondComplete(foamplusfactoryadheredcementitious coating)

6. FPUltraLite panels(factorycoatedfoampanels)fromStyro Industries

7. Protecto Bondpeelandstickmembrane

Source:M

artin

Holladay,GBA

p

8. EnergyEdge

45

Slabinsulationisrequiredwhen: Thespaceaboveisconditioned Slab is one foot or less below grade

Summary

Slabisonefootorlessbelowgrade

R10insulationrequired,extending 2feetbelowgradeforclimatezones4and5 4feetbelowgradeforclimatezone6

Insulationshouldextenddownwardfromthetopofthe slab (with two options to reduce slab edgetheslab(withtwooptionstoreduceslabedgeinsulationRvalue)

Exteriorslabinsulationmustbeprotected

46

4/10/2012

22

Questions&Evaluations

47

NextMonthsWebinar MakeupairandlargekitchenexhaustsystemsMay8,2012 1:00PM