Rigid Foam Board Insulation
The various types of rigid foam board can be used to
insulate just about anyaspect of a building.
Foam board can be used to insulate almost anything, including: roofs, walls, foundations, entry and overhead garage doors, pipes and tanks, under basement slabs, or over a slab-on-grade floor. Foam insulation placed in wall and floor cavities both insulates and offers some degree of soundproofing. Most varieties of foam have a higher R-Value /inch than fiberglass, cotton, or cellulose.
Installing rigid foam insulation over wall or roof framing reduces this thermal bridging, raises the R-value of the wall or roof assembly, and can eliminate or reduce air leaks. Building scientists Joseph Lstiburek and Peter Baker have reported that adding 1 in. of R-5 insulation to a 2x6 wall insulated with fiberglass batts increases the effective R-value of the wall from 14.4 to 19.4—a 35% gain with only a 15% increase in wall thickness. Adding 2 in. of foam raises the R-value from 14.4 to 23.8, an improvement of 65%.
Installing rigid foam insulation over wall or roof framing reduces this thermal bridging, raises the R-value of the wall or roof assembly, and can eliminate or reduce air leaks. Building scientists Joseph Lstiburek and Peter Baker have reported that adding 1 in. of R-5 insulation to a 2x6 wall insulated with fiberglass batts increases the effective R-value of the wall from 14.4 to 19.4—a 35% gain with only a 15% increase in wall thickness. Adding 2 in. of foam raises the R-value from 14.4 to 23.8, an improvement of 65%.
Polyiso retrofitted to a sloped ceiling
Polyiso is the most environmentally benign
Polyiso doesn't use ozone-depleting blowing agents; it uses water.
Polyiso doesn't use ozone-depleting blowing agents; it uses water.
