Foam insulation densities vary among closed cell vs open cell forms.
Exterior rigid foam insulation r value.
This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses.
The 1 inch foam on the outside of the 2 8 is ok but you ll need more r value planning on more insulation in the wall cavity.
C or thermal conductance of these materials is the reciprocal of the r value.
For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.
R 7 5 scored squared edge rigid foam board insulation sheathing model 88wd view the owens corning exterior insulation.
Falls in the middle of the three types of rigid foam insulation in both cost and r value used most in walls or below grade applications recyclable and at about r 5 per inch costs around 42 per sq.
House wrap is a good idea even with foam on the outside of the house.
It is available with r values ranging from r 18 to r 28 at a 3 inch thickness.
Closed cell foams are more dense and rigid typically about 2 lb cu.
More effective insulation with r values ranging from 3 6 to 8 0 rigid foam sheathing has much better insulation per inch than other materials i e.
3 benefits of rigid foam sheathing.
For example a house with 2 6 walls in climate zone 6 would need rigid foam with a minimum r value of r 11 25.
Open cell foams are typically about 1 2 lb cubic foot.
Polyurethane rigid foam is a.
It is denser than eps and provides more r value with a rating of 5 per inch of thickness.
Owens corning foamular 150 1 1 2 in.
Rigid foam insulation one option is to use polyurethane rigid foam insulation.
Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.
For a 1 in thick 4 8 panel comes unfaced or with a number of different plastic facings.
This foam board insulation is available with straight or tongue and groove edges to help limit air movement.