TECH SOLUTIONS 214.0 Reduce Wall Condensation Reduce
TECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated SheathingTECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated SheathingOther Insulated Foam SheathingProductsThese results demonstrate theeffectiveness of STYROFOAMSIS Brand Structural InsulatedSheathing. However, similarresults can also be achieved withother continuous insulated foamsheathing products from DowBuilding Solutions, such as: STYROFOAM BrandResidential Sheathing(extruded polystyrene) THERMAX Sheathing(polyisocyanurate) Super TUFF-R Insulation(polyisocyanurate)Similar to STYROFOAM SIS Brand Sheathing, these productsall have low water vapor permeanceof 0.3 perm, and can be installedas a WRB. Typically, insulatedfoam sheathings are non-structural,although STYROFOAM SIS Brand Sheathing combines thebenefits of continuous insulation,WRB and structural bracing intoone product. STYROFOAM SIS Brand Sheathing is the onlyinsulation product from Dow thatcan be used for lateral bracing.Significance of PermThird-party AgreementReferencesHousewrap, at 58 perms, isgenerally considered an adequateway to manage moisture inresidential walls. A commonperception in the residentialbuilding industry is that high-permhousewrap makes the walls more“breathable,” leading to betterperformance than low-perminsulated sheathing. Yet thecomparison data presented hereclearly show otherwise.Why didn’t the high-permhousewrap perform as well as thelow-perm insulated foam sheathingin the analyses? The housewrap’sperm was not a significant factorsince the OSB has such a low permat 1 perm. The housewrap’s highperm does not help the wall“breathe,” since the OSBdetermines the rate of watervapor diffusion to the outside.Both the housewrap and the OSBhave very low R-values and donot have the ability to raise thetemperature of the wall cavity tothe same level of performance ascan be achieved with insulatedsheathing.The end result is clear: Insulatedsheathing provides exceptionalcondensation protection inresidential walls because it raisesthe temperature of the stud cavityin cold weather, causing decreasedcondensation potential andincreased stud cavity dryingpotential to the inside of the building. The sheathing R-value has agreater effect on thermal andmoisture performance than permeance rating in this application.The following building scientistsand researchers recognize themoisture protection advantage ofinsulated sheathing in wallconstruction:The insulated effect of the foamsheathing does have the effectof keeping the stud cavity at ahigher temperature during thewinter than a similar cavityusing plywood or fiberboardsheathing.– USDA Forest ProductsLaboratory, Research PaperFPL 4331. Southern Pine Council, “ManagingMoisture and Mold” ProductPerformance Facts,www.southernpine.com/pdf/MOLDsheet0903 907.pdf2. WUFI is a trademark of theFraunhofer Institute for BuildingPhysics in Holzkirchen, Germany.WUFI ORNL is jointly developedwith the Oak Ridge NationalLaboratory in Oak Ridge, Tenn.,and funded by the U.S. Departmentof Energy. WUFI PRO version 3.3is commercially available heat andmoisture modeling software.Note: Models do not guaranteeactual field performance.Use exterior insulating sheathingin place of or in addition toplywood or fiberboard sheathingto greatly reduce the chancefor high wall cavity moisturelevels and the long-termpotential for wood decay.– Northwest Wall MoistureStudy, George A. Tsongas,Ph.D., P.E. laboratory tests showed thatthe addition of an exterior lowpermeability insulation retrofitsystem would result in a reduction in the moisture accumulationwithin the existing wood sidingand sheathing. These findingsare consistent with the resultsof a limited field survey. Themodel showed that the additionof the exterior retrofit insulationsystem raised the temperatureat the interface between thecavity insulation and the woodfiber sheathing.– National Bureau of Standards,Report DE-79-3 No. 35UNITED STATES . RESIDENTIAL TECHNIC AL INFORMATIONThe Core of Moisture ProtectionSummaryInsulated sheathing providesexceptional moisture protectionperformance in residential wallsversus traditional spun-bondedpolyolefin housewrap with orientedstrand board (OSB) sheathing.Increasing stud cavity temperatureis critical to managing the potentialfor condensation within conventional light framed wall designs.The high R-value* of exterior wallinsulation increases stud cavitytemperature, creating a distinctmoisture protection advantageover other non-insulated sheathingmaterials, as shown in Figure 1.The moisture content wasanalyzed in two types of wallassemblies – an assembly usingSTYROFOAM SIS BrandStructural Insulated Sheathing andone using housewrap and OSB.Testing was performed in both hotand cold climate scenarios. Neitherof the wall assemblies experiencedmoisture content greater than 20percent, which is the generallyaccepted threshold for potentialmold growing conditions withwood-based products. Theanalyses contained in this document demonstrate that insulatedsheathings result in drier studcavities than non-insulatedsheathing in both hot and coldclimates.For Technical Information: 1-866-583-BLUE (2583) . For Sales Information: 1-800-232-2436THE DOW CHEMICAL COMPANY . Dow Building Solutions . 200 Larkin . Midland, MI 48674www.dowbuildingsolutions.comNOTICE: No freedom from any patent owned by Dow or others is to be inferred. Because use conditions and applicable laws may differ from one locationto another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate forCustomer’s use and for ensuring that Customer’s workplace and disposal practices are in compliance with applicable laws and other government enactments.Dow assumes no obligation or liability for the information in this document. NO EXPRESS WARRANTIES ARE GIVEN EXCEPT FOR ANY APPLICABLEWRITTEN WARRANTIES SPECIFICALLY PROVIDED BY DOW. ALL IMPLIED WARRANTIES INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR APARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.NOTICE: Changes to the International Residential Code require the installation of a water-resistive barrier (WRB) within most exterior wall assemblies inresidential construction. The following Dow insulated sheathing products qualify as a WRB when installed according to the installation instructions developedfor “installation of foam sheathing as a water-resistive barrier”: STYROFOAM DURAMATE Plus, STYROFOAM Residential Sheathing, STYROFOAM Tongue and Groove, STYROFOAM SIS , STYROFOAM Square Edge, STYROFOAM Residing Board, STYROFOAM High Performance Underlayment,THERMAX Sheathing, TUFF-R and Super TUFF-R and therefore do not require the use of a building paper or a housewrap as a WRB. When a WRB isnot needed, these Dow foam sheathings may be installed according to standard installation instructions for foam sheathing from Dow. Be sure products andinstallation instructions meet code requirements for your particular location. Note: WEATHERMATE and WEATHERMATE Plus Housewraps have alreadyqualified as water-resistive alternatives to the prescribed felt (see Evaluation Reports NER-593 and NER-640 for approved alternative).STYROFOAM Brand Extruded Polystyrene InsulationCAUTION: This product is combustible. Protect from high heat sources. A protective barrier or thermal barrier may be required as specified in the appropriatebuilding code. For more information, consult MSDS, call Dow at 1-866-583-BLUE (2583) or contact your local building inspector. In an emergency, call1-989-636-4400.Dow Polyisocyanurate InsulationCAUTION: This product is combustible and shall only be used as specified by the local building code with respect to flame spread classification and to the useof a suitable thermal barrier. For more information, consult MSDS, call Dow at 1-866-583-BLUE (2583) or contact your local building inspector. In an emergency,call 1-989-636-4400.WARNING: Rigid foam insulation does not constitute a working walkable surface or qualify as a fall protection product.Building and/or construction practices unrelated to building materials could greatly affect moisture and the potential for mold formation. No material supplierincluding Dow can give assurance that mold will not develop in any specific system.Published November 2008The substantial energy savingsadvantage of continuous insulatedfoam sheathing in residential wallsis well known. However, doesinsulated sheathing offer greatermoisture protection than housewrap and OSB? What impact doessheathing have on condensationpotential inside the stud cavity?Further, is the perm of sheathingmaterials the most important factor to consider for condensationpotential inside the wall cavity?Or, does the sheathing’s R-valueplay a greater role?Why is it important to ask thesequestions? Excessive moistureinside the wall can potentiallylead to mold. Wood or woodbased products with a moisturecontent of 20 percent or more areconsidered to have favorableconditions for mold growth.1 It isimperative to understand theimpact that sheathing selectioncan have on the condensationpotential inside the stud cavity.The two wall system typesshown in Figure 2 meet waterresistive barrier (WRB) requirements,and therefore effectively shedbulk water. However, not all WRBsystems perform equally in managing condensation potential andmoisture content inside the wall.The ability to shed bulk watershould not be confused with theability to manage condensationpotential and moisture contentinside the wall. Both abilities arevital to providing comprehensivemoisture management in residential walls. The following analysesreveal how insulated sheathingsprovide a moisture protectionadvantage over housewrap andOSB sheathing materials.Figure 1: Insulated sheathing results in higher temperatures in thestud cavity, which increases moisture evaporation and drying tothe interior.Insulated Sheathing: Warmer stud cavity Higher drying potential to the interior Lower condensation potential in thestud cavityHousewrap/OSB: Colder stud cavity Lower drying potential Higher condensation potential in thestud cavityWater VaporWater VaporCondensationPrinted in U.S.A. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of DowTECH SOLUTIONS 214.0Reduce Wall CondensationPotential withInsulated Sheathing Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of DowHabitat for Humanity is a registered service mark owned by Habitat for Humanity InternationalForm No. 179-07513-1108P&MUNITED STATES . RESIDENTIAL TECHNIC AL INFORMATIONMcKAY200567Mckay198005 Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow*R means resistance to heat flow. The higher the R-value, the greater the insulating power.UNITED STATES . RESIDENTIAL TECHNIC AL INFORMATION
3-1/2" Fiberglass Batt1/2" or 1" STYROFOAMSIS Brand Sheathing 7/16" OSB Housewrap4" Brick 1" Air SpaceSTYROFOAM SIS BrandSheathing (laminated fiber layer)OSB SheathingSTYROFOAM SIS BrandSheathing (foam insulation layer)MethodologyTwo residential wall systemswere compared using the WUFIORNL2 (PRO version 3.3) heat andmoisture analysis tool for buildingenvelope construction. WUFI isrecognized as a highly advancedmethod of hygrothermal modelingby North American organizationssuch as ASHRAE (AmericanSociety for Heating, Refrigeratingand Air-Conditioning Engineers)and BETEC (Building Environmentand Thermal Envelope Council).WUFI PRO modeling is wellHousewrapdocumented and has beenvalidated by many comparisonsbetween calculated and fieldperformance data.The wall systems comparedwere identical except for thesheathing materials. See Figure 2for a detailed comparison.One wall system featuredSTYROFOAM SIS BrandStructural Insulated Sheathing.The other wall system utilizedhousewrap with OSB sheathing.Two climate scenarios, cold andhot, were modeled for eachwall system.WUFI Results: Cold ClimateComparisonA comparison of the two wallsystems was made in thenorthern cold weather climateprofile of Chicago (ASHRAEClimate Zone 5). Except for thesheathing materials, all otherfactors were the same for bothwall systems. The time periodmodeled was two years, with astart date of October 1. Threesheathing materials were modeled:1/2" and 1" thick STYROFOAMSIS Brand Structural InsulatedSheathing and housewrap/OSB.The results are shown in Figures3 and 4. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow2UNITED STATES . RESIDENTIAL TECHNIC AL INFORMATIONNot only does insulated foamsheathing have an obvious energysavings advantage, it also elevatesthe temperature of the stud cavityin cold weather. Elevating thetemperature inside the walldecreases condensation potentialand increases drying potential tothe inside of the building.Another cold climate comparisonmonitored moisture content insidethe gypsum board during thesame two-year period (Figure 4).Again, the wall systems withSTYROFOAM SIS BrandStructural Insulated Sheathingoutperformed the wall systemfeaturing housewrap/OSB. Wallsusing STYROFOAM SIS BrandSheathing had substantially lowermoisture content in the gypsumboard during the summer months,which allows wood studs behindSTYROFOAM SIS BrandSheathing to “live” in a drier wallenvironment, reducing thepotential for mold and rotting.Figure 3: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Sheathing; Chicago2520% moisture threshold for potential mold growth20peaks occur during winter months1" STYROFOAM SIS Brand; laminated fiber onlyslow drying150.5" STYROFOAM SIS Brand; laminated fiber onlyHousewrap/OSB; OSB only10fast drying50012Time (years)Figure 4: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Gypsum Board; Chicago8peaks occur in September761" STYROFOAM SIS Brand; gypsum only50.5" STYROFOAM SIS Brand; gypsum only4Housewrap/OSB; gypsumonly32Figure 5: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Sheathing; Houston2520% moisture threshold for potential mold growth201" STYROFOAM SIS Brand; laminated fiber only% Moisture content 1/2" GypsumFigure 3 compares the moisturecontent within the actual sheathing material of each wall assembly.For STYROFOAM SIS BrandSheathing, the moisture content ismonitored inside the laminatedfiber portion only. For the housewrap/OSB sheathing, the moisturecontent is monitored inside theOSB portion only. The laminatedfiber and OSB are both woodbased materials that face theinterior side of the stud cavity intheir respective wall systems. Thislocation is the most critical portionof the wall to compare becausecondensation is most likely tooccur here, especially duringwinter months. The two peaks inthe moisture content data shownin Figure 3 occurred during wintermonths when temperatures arecoldest.STYROFOAM SIS BrandSheathing had exceptionalperformance not only in the wintermonths, but it exceeded themoisture protection performanceof housewrap/OSB during theentire two-year period by a widemargin. Housewrap/OSB did notkeep the wall components nearlyas dry.It is evident from Figure 3 thathousewrap/OSB sheathing ismuch closer to the 20 percentthreshold for potential mold growingconditions. Insulated foamsheathing demonstrates exceptional performance and is wellunder the 20 percent threshold.TECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated SheathingHousewrap/OSB; OSB only10500From Figures 5 and 6, it isevident that STYROFOAM SIS Brand Structural InsulatedSheathing outperforms housewrap/OSB sheathing in hotsouthern climates, in this caseHouston (ASHRAE Climate Zone2). Again, the insulated foamsheathing kept the wall components drier during the two-yearperiod.0012Time (years)The wall temperature of thesheathing’s interior surfacewas also monitored during thetwo-year period. During the wintermonths, the interior surface of 1"STYROFOAM SIS BrandSheathing was as much as 14 Fwarmer than the housewrap/OSBinterior surface and the 1/2"STYROFOAM SIS Brand Sheathingwas as much as 7 F warmer.The higher wall temperatureswithin the wall assembliesfeaturing STYROFOAM SIS Brand Sheathing are principallydue to the high R-value of therigid foam layer. Higher stud cavitytemperature is the primary reasonthe assemblies using STYROFOAMSIS Brand Sheathing had considerably lower moisture content. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of DowUNITED STATES . RESIDENTIAL TECHNIC AL INFORMATION12Time (years)Figure 6: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Gypsum Board; Houston9peaks occur in August87WUFI Results: Hot ClimateComparison10.5" STYROFOAM SIS Brand; laminated fiber only15% Moisture content Key inputs for the model were:Mean interior relative humidity:40 percent with an amplitudeof 10 percentMean interior temperature:70 F with an amplitude of 1.8Two coats of latex paint ondrywall, 3 permsNo interior vapor retarder(e.g., polyethylene)R-13 fiberglass batts; unfacedHousewrap, 58 permsOSB, 1 permSTYROFOAM SIS BrandStructural Insulated Sheathingis a multilayer product: facer,foam and laminated fiber layerExterior STYROFOAM SIS Brand Sheathing facer, 0.3perm% Moisture contentFigure 2: STYROFOAM SIS Brand Structural Insulated Sheathing WallAssembly vs. Housewrap/OSB Wall AssemblyTECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated Sheathing% Moisture contentTECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated Sheathing61" STYROFOAM SIS Brand; gypsum only50.5" STYROFOAM SIS Brand; gypsum onlyHousewrap/OSB; gypsumonly43210012Time (years)Figure 5 demonstrates thathousewrap/OSB sheathing ismuch closer to the 20 percentthreshold for potential moldgrowing conditions. So in hotclimates, too, insulated foamsheathing demonstrates exceptional performance and is wellunder the 20 percent threshold. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow3UNITED STATES . RESIDENTIAL TECHNIC AL INFORMATION4
3-1/2" Fiberglass Batt1/2" or 1" STYROFOAMSIS Brand Sheathing 7/16" OSB Housewrap4" Brick 1" Air SpaceSTYROFOAM SIS BrandSheathing (laminated fiber layer)OSB SheathingSTYROFOAM SIS BrandSheathing (foam insulation layer)MethodologyTwo residential wall systemswere compared using the WUFIORNL2 (PRO version 3.3) heat andmoisture analysis tool for buildingenvelope construction. WUFI isrecognized as a highly advancedmethod of hygrothermal modelingby North American organizationssuch as ASHRAE (AmericanSociety for Heating, Refrigeratingand Air-Conditioning Engineers)and BETEC (Building Environmentand Thermal Envelope Council).WUFI PRO modeling is wellHousewrapdocumented and has beenvalidated by many comparisonsbetween calculated and fieldperformance data.The wall systems comparedwere identical except for thesheathing materials. See Figure 2for a detailed comparison.One wall system featuredSTYROFOAM SIS BrandStructural Insulated Sheathing.The other wall system utilizedhousewrap with OSB sheathing.Two climate scenarios, cold andhot, were modeled for eachwall system.WUFI Results: Cold ClimateComparisonA comparison of the two wallsystems was made in thenorthern cold weather climateprofile of Chicago (ASHRAEClimate Zone 5). Except for thesheathing materials, all otherfactors were the same for bothwall systems. The time periodmodeled was two years, with astart date of October 1. Threesheathing materials were modeled:1/2" and 1" thick STYROFOAMSIS Brand Structural InsulatedSheathing and housewrap/OSB.The results are shown in Figures3 and 4. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow2UNITED STATES . RESIDENTIAL TECHNIC AL INFORMATIONNot only does insulated foamsheathing have an obvious energysavings advantage, it also elevatesthe temperature of the stud cavityin cold weather. Elevating thetemperature inside the walldecreases condensation potentialand increases drying potential tothe inside of the building.Another cold climate comparisonmonitored moisture content insidethe gypsum board during thesame two-year period (Figure 4).Again, the wall systems withSTYROFOAM SIS BrandStructural Insulated Sheathingoutperformed the wall systemfeaturing housewrap/OSB. Wallsusing STYROFOAM SIS BrandSheathing had substantially lowermoisture content in the gypsumboard during the summer months,which allows wood studs behindSTYROFOAM SIS BrandSheathing to “live” in a drier wallenvironment, reducing thepotential for mold and rotting.Figure 3: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Sheathing; Chicago2520% moisture threshold for potential mold growth20peaks occur during winter months1" STYROFOAM SIS Brand; laminated fiber onlyslow drying150.5" STYROFOAM SIS Brand; laminated fiber onlyHousewrap/OSB; OSB only10fast drying50012Time (years)Figure 4: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Gypsum Board; Chicago8peaks occur in September761" STYROFOAM SIS Brand; gypsum only50.5" STYROFOAM SIS Brand; gypsum only4Housewrap/OSB; gypsumonly32Figure 5: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Sheathing; Houston2520% moisture threshold for potential mold growth201" STYROFOAM SIS Brand; laminated fiber only% Moisture content 1/2" GypsumFigure 3 compares the moisturecontent within the actual sheathing material of each wall assembly.For STYROFOAM SIS BrandSheathing, the moisture content ismonitored inside the laminatedfiber portion only. For the housewrap/OSB sheathing, the moisturecontent is monitored inside theOSB portion only. The laminatedfiber and OSB are both woodbased materials that face theinterior side of the stud cavity intheir respective wall systems. Thislocation is the most critical portionof the wall to compare becausecondensation is most likely tooccur here, especially duringwinter months. The two peaks inthe moisture content data shownin Figure 3 occurred during wintermonths when temperatures arecoldest.STYROFOAM SIS BrandSheathing had exceptionalperformance not only in the wintermonths, but it exceeded themoisture protection performanceof housewrap/OSB during theentire two-year period by a widemargin. Housewrap/OSB did notkeep the wall components nearlyas dry.It is evident from Figure 3 thathousewrap/OSB sheathing ismuch closer to the 20 percentthreshold for potential mold growingconditions. Insulated foamsheathing demonstrates exceptional performance and is wellunder the 20 percent threshold.TECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated SheathingHousewrap/OSB; OSB only10500From Figures 5 and 6, it isevident that STYROFOAM SIS Brand Structural InsulatedSheathing outperforms housewrap/OSB sheathing in hotsouthern climates, in this caseHouston (ASHRAE Climate Zone2). Again, the insulated foamsheathing kept the wall components drier during the two-yearperiod.0012Time (years)The wall temperature of thesheathing’s interior surfacewas also monitored during thetwo-year period. During the wintermonths, the interior surface of 1"STYROFOAM SIS BrandSheathing was as much as 14 Fwarmer than the housewrap/OSBinterior surface and the 1/2"STYROFOAM SIS Brand Sheathingwas as much as 7 F warmer.The higher wall temperatureswithin the wall assembliesfeaturing STYROFOAM SIS Brand Sheathing are principallydue to the high R-value of therigid foam layer. Higher stud cavitytemperature is the primary reasonthe assemblies using STYROFOAMSIS Brand Sheathing had considerably lower moisture content. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of DowUNITED STATES . RESIDENTIAL TECHNIC AL INFORMATION12Time (years)Figure 6: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Gypsum Board; Houston9peaks occur in August87WUFI Results: Hot ClimateComparison10.5" STYROFOAM SIS Brand; laminated fiber only15% Moisture content Key inputs for the model were:Mean interior relative humidity:40 percent with an amplitudeof 10 percentMean interior temperature:70 F with an amplitude of 1.8Two coats of latex paint ondrywall, 3 permsNo interior vapor retarder(e.g., polyethylene)R-13 fiberglass batts; unfacedHousewrap, 58 permsOSB, 1 permSTYROFOAM SIS BrandStructural Insulated Sheathingis a multilayer product: facer,foam and laminated fiber layerExterior STYROFOAM SIS Brand Sheathing facer, 0.3perm% Moisture contentFigure 2: STYROFOAM SIS Brand Structural Insulated Sheathing WallAssembly vs. Housewrap/OSB Wall AssemblyTECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated Sheathing% Moisture contentTECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated Sheathing61" STYROFOAM SIS Brand; gypsum only50.5" STYROFOAM SIS Brand; gypsum onlyHousewrap/OSB; gypsumonly43210012Time (years)Figure 5 demonstrates thathousewrap/OSB sheathing ismuch closer to the 20 percentthreshold for potential moldgrowing conditions. So in hotclimates, too, insulated foamsheathing demonstrates exceptional performance and is wellunder the 20 percent threshold. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow3UNITED STATES . RESIDENTIAL TECHNIC AL INFORMATION4
3-1/2" Fiberglass Batt1/2" or 1" STYROFOAMSIS Brand Sheathing 7/16" OSB Housewrap4" Brick 1" Air SpaceSTYROFOAM SIS BrandSheathing (laminated fiber layer)OSB SheathingSTYROFOAM SIS BrandSheathing (foam insulation layer)MethodologyTwo residential wall systemswere compared using the WUFIORNL2 (PRO version 3.3) heat andmoisture analysis tool for buildingenvelope construction. WUFI isrecognized as a highly advancedmethod of hygrothermal modelingby North American organizationssuch as ASHRAE (AmericanSociety for Heating, Refrigeratingand Air-Conditioning Engineers)and BETEC (Building Environmentand Thermal Envelope Council).WUFI PRO modeling is wellHousewrapdocumented and has beenvalidated by many comparisonsbetween calculated and fieldperformance data.The wall systems comparedwere identical except for thesheathing materials. See Figure 2for a detailed comparison.One wall system featuredSTYROFOAM SIS BrandStructural Insulated Sheathing.The other wall system utilizedhousewrap with OSB sheathing.Two climate scenarios, cold andhot, were modeled for eachwall system.WUFI Results: Cold ClimateComparisonA comparison of the two wallsystems was made in thenorthern cold weather climateprofile of Chicago (ASHRAEClimate Zone 5). Except for thesheathing materials, all otherfactors were the same for bothwall systems. The time periodmodeled was two years, with astart date of October 1. Threesheathing materials were modeled:1/2" and 1" thick STYROFOAMSIS Brand Structural InsulatedSheathing and housewrap/OSB.The results are shown in Figures3 and 4. Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow2UNITED STATES . RESIDENTIAL TECHNIC AL INFORMATIONNot only does insulated foamsheathing have an obvious energysavings advantage, it also elevatesthe temperature of the stud cavityin cold weather. Elevating thetemperature inside the walldecreases condensation potentialand increases drying potential tothe inside of the building.Another cold climate comparisonmonitored moisture content insidethe gypsum board during thesame two-year period (Figure 4).Again, the wall systems withSTYROFOAM SIS BrandStructural Insulated Sheathingoutperformed the wall systemfeaturing housewrap/OSB. Wallsusing STYROFOAM SIS BrandSheathing had substantially lowermoisture content in the gypsumboard during the summer months,which allows wood studs behindSTYROFOAM SIS BrandSheathing to “live” in a drier wallenvironment, reducing thepotential for mold and rotting.Figure 3: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Sheathing; Chicago2520% moisture threshold for potential mold growth20peaks occur during winter months1" STYROFOAM SIS Brand; laminated fiber onlyslow drying150.5" STYROFOAM SIS Brand; laminated fiber onlyHousewrap/OSB; OSB only10fast drying50012Time (years)Figure 4: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Gypsum Board; Chicago8peaks occur in September761" STYROFOAM SIS Brand; gypsum only50.5" STYROFOAM SIS Brand; gypsum only4Housewrap/OSB; gypsumonly32Figure 5: STYROFOAM SIS Brand Structural Insulated Sheathing vs.Housewrap/OSB; % Moisture Content of Sheathing; Houston2520% moisture threshold for potential mold growth201" STYROFOAM SIS Brand; laminated fiber only% Moisture content 1/2" GypsumFigure 3 compares the moisturecontent within the actual sheathing material of each wall assembly.For STYROFOAM SIS BrandSheathing, the moisture content ismonitored inside the laminatedfiber portion only. For the housewrap/OSB sheathing, the moisturecontent is monitored inside theOSB portion only. The laminatedfiber and OSB are both woodbased materials that face theinterior side of the stud cavity intheir respective wall systems. Thislocation is the most critical portionof the wall to compare becausecondensation is most likely tooccur here, especially duringwinter months. The two peaks inthe moisture content data shownin Figure 3 occurred during wintermonths when temperatures arecoldest.STYROFOAM SIS BrandSheathing had exceptionalperformance not only in the wintermonths, but it exceeded themoisture protection performanceof housewrap/OSB during theentire two-year period by a widemargin. Housewrap/OSB did notkeep the wall components nearlyas dry.It is evident from Figure 3 thathousewrap/OSB sheathing ismuch closer to the 20 percentthreshold for potential mold growingconditions. Insulated foamsheathing demonstrates exceptional performance and is wellunder the 20 percent threshold.TECH SOLUTIONS 214.0Reduce Wall Condensation Potential withInsulated SheathingHousewrap/OSB; OSB only10500From Figures 5 and 6, it is
† Super TUFF-R Insulation (polyisocyanurate) Similar to STYROFOAM SIS Brand Sheathing, these products all have low water vapor permeance of 0.3 perm, and can be installed as a WRB. Typically, insulated foam sheathings are non-structural, although STYROFOAM SIS Brand Sheathing combine
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