I N S U L AT E D D R A I N A G E B OA R D

STEEL STUD DESIGN GUIDEVAPOR / DEW POINT ANALYSIS

* ®

*PATENT #5860259

TYPICAL VENEER WALL DEW POINT ANALYSIS

NOTICE: This calculation is based onthe theory of Water Vapor Migrationpresented in the ASHRAE 1993Fundamentals Handbook. Actual per-formance may vary depending on airinfiltration, workmanship, and buildingmaterials. Since the information is pro-vided without charge, The DowChemical Company assumes no obli-gation or liability for its use.

BRICK VENEER / STEEL STUD WALL (PRIOR TO 8/02 CSI ARTICLE)

R-19 BATT INSULATION

15# BUILDING PAPER

1/2” DRYWALL

6” STEEL STUDS @ 16"O.C.

1/2” DENS GLAS GOLD

2” AIRSPACE

3 5/8” BRICK

APPARENT R-VALUE ABOUT 22.16ACTUAL R-VALUE* 10.26

*TAKING INTO ACCOUNT STEEL STUD THERMAL SHORTING AND ASHRAE 90.1 CORRECTION FACTORS

OVER ONEOUNCE OF

CONDENSATIONOCCURS

WITHIN WALLPER DAY!

TYPICAL VENEER WALL DEW POINT ANALYSIS

BRICK VENEER / THERMADRAIN / STEEL STUD WALL

NOTICE: This calculation is based onthe theory of Water Vapor Migrationpresented in the ASHRAE 1993Fundamentals Handbook. Actual per-formance may vary depending on airinfiltration, workmanship, and buildingmaterials. Since the information isprovided without charge, The DowChemical Company assumes no obli-gation or liability for its use.

6” STEEL STUDS

1/2” DENS GLAS GOLD

HOUSEWRAP OR TYVEK BETWEEN DENS GLAS AND THERMADRAIN

1/2” DRYWALL

2” THERMADRAIN

5/8” TOLERANCE SPACE

3 5/8” BRICK

R-VALUE OF WALL* 14.24

SLIGHTCONDENSATION IN

AIRSPACE

TYPICAL VENEER WALL DEW POINT ANALYSIS

THERMADRAIN CAVITY WALL

3 5/8” BRICK

7 5/8” CMU

2” THERMADRAIN WITHSTYROFOAM INS.(DOW STYROFOAM)

- 2” INSULATION- 3/8” DRAINAGE MAT

2 3/8” TOTAL THICKNESS

5/8” TOLERANCE/ ANCHOR SPACE

1/4” OVERHANG

3”

R-VALUE 13.86

• R-Value of wall using Thermadrain

with Dow Styrofoam*

1 1/2” - 11.36

2” - 13.86

2 1/2” - 16.36

NOTICE: This calculation is based on thetheory of Water Vapor Migration presentedin the ASHRAE 1993 FundamentalsHandbook. Actual performance may varydepending on air infiltration, workmanship,and building materials. Since the informa-tion is provided without charge, The DowChemical Company assumes no obliga-tion or liability for its use.

SLIGHTCONDENSATION IN

AIRSPACE

1/2” DRYWALL

STEEL STUDS @ 16" O.C.

4' X 8' SHEETS OF 1/2" DENS GLAS GOLD

NO BATT INSULATION (COULD SUPPORT MOLD / MILDEW)

CLAY BRICK - ASTM C216, TYPE FBS, GRADE SW

TYPICAL SECTION

5/8” TOLERANCE / ANCHOR INSTALLA-TION SPACE

SELF ADHESIVE FLASHING & STAINLESSSTEEL DRIP EDGE BY IPCO

OPEN CELL VENT IN HEAD JOINT ON TOPOF FLASHING, RECESSED TO TOUCH MAT@ 24” O.C.

STYROFOAM WEATHERMATEPLUS HOUSEWRAP BY DOW,OR TYVEK, SHIPLAPPED OVERFLASHING AND SHEETING(BETWEEN THE DENS GLASAND THERMADRAIN)

ANCHORS

1 HOHMANN BARNARD X -SEAL ANCHOR. @1PER 2.67 FT2 OF WALL AREA WITH LEG OF2”, 2 1/2” OR 3 1/2”

OR

1 HECKMANN POSITIE WITH BARREL SCREW@1 PER 2.67 FT2 OF WALL AREA WITH 11/2”, 2”, 3” OR 3 1/2” DEEP BARREL SCREW(HOT DIPPED)

OR

1 WIRE-BOND HCL-711 ANCHOR @1 PER2.67 FT2 OF WALL AREA WITH 1 1/2”, 2”, 2 1/2” OR 3” PLATE LEGS(THERMADRAIN MUST BE CAVITY CUT 16” X96” WHEN USING THIS TIE)

4’ X 8’ SQUARE SHEETS OF THERMADRAIN® EDGE BUTTED ;PERIMETER JOINTS PRESSED INTO ABEAD OF LOW-RISE FOAM (GREATSTUFF BY DOW)

BEAD OF FOAM

CAVITY CUT

FLUSH CUT

ACTUALTHICKNESS

WALL R-VALUE WITHDOW SUPER TUFF R-C / THERMAX

1” THERMADRAIN 1 3/8” R = 10.841 1/2” THERMADRAIN 1 7/8” R = 14.14

2” THERMADRAIN 2 3/8” R = 17.342 1/2” THERMADRAIN 2 7/8” R = 20.14

3” THERMADRAIN 3 3/8" R = 23.343 1/2” THERMADRAIN 3 7/8" R = 26.34

ACTUALTHICKNESS

WALL R-VALUE WITH DOW EXTRUDED POLYSTYRENE

1 1/2” THERMADRAIN 1 7/8” R = 11.84

2” THERMADRAIN 2 3/8” R = 14.34

2 1/2” THERMADRAIN 2 7/8” R = 16.84

3” THERMADRAIN 3 3/8" R = 19.34

THERMADRAIN WITH DOW SUPER TUFF R-C / THERMAX THERMADRAIN WITH DOW EXTRUDED POLYSTYRENE

4' X 8' SQUARE SHEETS OF THERMADRAIN® EDGE BUTTED; PERIMETER JOINTS

PRESSED INTO A BEAD OF MASTIC, NP1

5/8" TOLERANCE / ANCHOR INSTALLATION SPACE

SELF ADHESIVE FLASHING & S.S. DRIPEDGE BY IPCO

OPEN CELL VENT IN HEAD JOINT ON TOP OF FLASHING, RECESSED TO

TOUCH MAT @ 2’0" O.C

STEEL STUDS @ 16" O.C.

4’ X 8’ SHEETS OF 1/2" DENS GLAS GOLD

NO BATT INSULATION (COULD SUPPORT MOLD / MILDEW)

CLAY BRICK - ASTM C216,TYPE FBS, GRADE SW

STYROFOAM WEATHERMATE PLUS HOUSE WRAP BY DOW, SHIPLAPPED OVER FLASHING & SHEETING (BETWEEN DENS GLAS AND THERMADRAIN)

BEAD OF SEALANT

TUBE STEEL

LINDAPTERHOLLO BOLT

1/2Ó DRYWALL

SECTION AT LINTEL

ThermaDrain Insulated Drainage Board

STYROFOAM WEATHERMATE PLUSHOUSEWRAP BY DOW, OR TYVEK,SHIPLAPPED OVER FLASHING ANDSHEETING (BETWEEN THE DENS GLAS AND THERMADRAIN)

DEWPOINTBLUELTR.QXD REVISED 3-19-2008

423 Joseph Drive South Elgin, IL 60177800-837-4065 847-289-2804(fax)

4' x 8' SQUARE SHEETS OF THERMADRAINEDGE BUTTED; PERIMETER JOINTS

PRESSED INTO A BEAD OF MASTIC, NP1,OR GREAT STUFF BY DOW (LOW RISE)

5/8" DRYWALL