1 2 Inch Foam Board R Value

Choose this option for areas that need a good amount of strength and water resistance.

1 2 inch foam board r value.

R value chart for enerfoil tm rigid foam faced insulation. Thickness inches r value in i p imperial rsi r value in metric 0 5. Closed cell rigid foam board designed to resist moisture and helps to block mildew. Highly questionable 30 also see.

It provides r values that range from 3 6 to 4 2 per inch. Some products have reinforced facing to make them sturdier. One inch of foam board only provides a minimal insulating value. This material offers the highest r values about r 6 to 6 5.

30 25 32 board r 2 06. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. Exterior above grade walls underneath vinyl siding claddings. Has a higher r value than wood fiber plywood or 1 2 in.

It provides about r 5 per inch. Conditioned per atsm c1289 test method astm c518 1 2. Find the foamular f 150 1 1 2 in. Fiberboard insulating sheathing 25 32 thick regular density per inch.

Insulation board 270824 made for exterior wall assemblies tough lightweight and offers exceptional insulating power at the home depot owens corning foamular 150 1 1 2 in. 30 divide this per inch number by 2 to obtain the r value for 1 2 regular density fiberboard r 1 32. One inch of foam board isn t sufficient for two reasons. That vapor barrier stops moisture from the foundation concrete from getting into the framed wall assembly.

1 you need a minimum of 1 1 2 inches 2 preferably of foam closed cell xps to create a vapor barrier.