1 2 Inch Foam Board R Value

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

1 2 inch foam board r value. Fiberboard nail base insulating board 1 2 inch. Fiberboard insulating sheathing 25 32 thick regular density per inch. Exterior above grade walls underneath vinyl siding claddings. This material offers the highest r values about r 6 to 6 5.

That vapor barrier stops moisture from the foundation concrete from getting into the framed wall assembly. R 7 5 scored squared edge rigid foam board insulation sheathing 88wd the home depot. 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. 30 divide this per inch number by 2 to obtain the r value for 1 2 regular density fiberboard r 1 32. Conditioned per atsm c1289 test method astm c518 1 2. It provides about r 5 per inch.

Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. Find the foamular f 150 1 1 2 in. 30 25 32 board r 2 06. R value chart for enerfoil tm rigid foam faced insulation.

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. It provides r values that range from 3 6 to 4 2 per inch. Click here to shop loctite foamboard adhesive. One inch of foam board only provides a minimal insulating value.

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