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2 layers of 1 2 gypsum wallboard r-value

walls - Do two layers of 1/2" drywall provide a fire rating ...

Also the type of gypsum panel used Type X board or Type C board. Fire code C has a better rating than Type X. To include the installation of the board joints Two layers of 1/2 inch require the first layer to be horizontal stagger joints face layer vertically staggered joints.

Composite Wall R-Values | EGEE 102: Energy Conservation and ...

Whereas the fiberglass each inch has a R-value of 3.7. We are using 3 and a half inches. So 3.5 times 3.7 would give us about 13.00 R-value. And the last layer would be one half inch plaster board which is also drywall and its R-value is given as .45. 1/2" wood siding: 0.81 3/4" plywood: 0.94 3 1/2 Fiberglass (3.7/inch): 13.00 1/2" plaster ...

What Thickness of Gypsum for Ceiling & Walls? | eHow

So a 2-by-4 is really 1 1/2 inches by 3 1/2 inches. The same rule for wallboard thickness on a ceiling also holds true on walls. Minimum thickness of 1/2 inch is suitable for wall studs on 16-inch centers but use 5/8-inch wallboard for 24-inch centers.

GA 235 2019 FINAL 031119 - American Gypsum

1 Layer 2 Layers 1 Layer 2 Layers Thickness in. (mm) Board Type in. mm in. mm in. mm in. mm 1/2 (12.7) regular 12 300 30 760 12 300 42 1070 1/2 (12.7) type X 24 610 54 1370 24 610 54 1370 5/8 (15.9) type X 30 760 72 1830 24 610 60 1520

USG SHEETROCK BRAND GYPSUM PANELS

2. 3/8 in. (9.5 mm) gypsum wallboard shall not be applied to ceilings where the gypsum board supports thermal insulation. 3. 1/4 in. (6.4 mm) panels are not recommended on ceilings to receive water-based texture material. 4. For double-layer ceilings adhesive must be used to laminate 1/4 in. (6.4 mm) and 3/8 in. (9.5 mm) gypsum wallboard.