Spray Foam Insulation Thickness Basement

Last year we had closed cell foam insulation basf walltite profesionally sprayed on the inside walls to a thickness of 4 inches followed up by a layer of fire retardant material code on all exposed walls about 2 3 of the basement the other 1 3 is covered up.

Spray foam insulation thickness basement.

Often times we end up insulating basement walls with a hybrid approach. Depending on thickness and the type of foam you choose super high effective r values can be achieved. Average spray foam insulation cost like all forms of insulation spray foam is designed to prevent heat from traveling between the interior of your home and the exterior. Then we build a stud wall which holds the foam board in place but also provides room for wiring and hvac.

We are ready to insulate the walls and are going to use closed cell spray foam. This is a poured full basement below grade. I ve also read that nominal insulation for the basement walls should be between 15 and 20r. Most often this is between a warm home and a cold exterior although in hot climates it can be a cool interior and warm air outside.

Despite the name spray foam insulation isn t exclusively sprayed. Install two inches of rigid insulation board directly against concrete. The substance will later expand to form a thick foam. Spray foam insulation essentially functions by starting as a liquid before hardening into a solid mass after drying.

In addition foam in place insulation is blown into walls or other cavities where it then hardens. The ideal basement wall assembly to prevent mold growth. Frame your wall against the rigid foam with a thermal break of foam 1 4 between the bottom sill and the concrete floor. I m finishing my basement in southeastern wisconsin.

Its r value of r 2 9 and r 3 8 per inch in thickness is inappropriate. Spray foam insulation costs 1 36 to 2 63 per square foot depending on if it s open or closed cell. Instead it can be injected poured or sprayed. One said i only need 1 against the walls and 3 in the sills.

For an average 2 200 square foot home open cell foam insulation costs 1 254 for the minimum 1 5 thickness and 2 926 to spray the maximum 3 5 thickness on average while a closed cell foam installation costs 6 776. Optional walls insulate with fiberglass batts against rigid foam. Basement spray foam insulation. The spray foam usually comes from polyurethane.

First we install two inches of rigid foam board insulation closed cell. Rigid foam panels are also a good way to insulate on the inside of concrete basement walls. One disadvantage of rigid foam is for it to be effective it must be attached directly to the wall using adhesive or idp foam insulation anchors. It is easiest to attach it to the wall with a couple of concrete nails or even some adhesive while you frame walls.

It best works when applied wet.