Combining Rigid Foam And Batt Insulation

I live in wa state climate zone 8a marine puget sound area.

Combining rigid foam and batt insulation.

Cape cod for myself just south of allentown pa. The layering is from the outside inwards roof 1 in. Flash and batt is a combination of spray foam insulation with fiberglass batts. Rigid foam installed on the inside i built a 4500 sq ft.

I m building my own house and reading up on ways to make my house more energy efficient. It s a technique used by some insulation contractors where a flash of closed cell spray foam at 1 to 2 inches is applied in an effort to create an air seal and then puts fiberglass batt insulation over it. The studs were 2 x 6 with fg batts. Fiberglass batts mineral wool batts rigid foam insulation or spray foam insulation.

Researchers who have measured the moisture content of rim joists with rigid foam on both sides haven t discovered any problems the moisture content of the rim joists isn t worrisome. It can potentially replace the vapor barrier and house wrap as well. It s pretty wet here and i m concerned about moisture from the exterior walls. Also squeezing an r19 batt into the remaining space will reduce the performance of the batt.

It also had 1 foil faced thermax on every exterior wall. In this video matt shows off a hybrid insulation system for a high performance home utilizing the flash batt method. Cutting rigid foam board to fit between studs will be labour intensive and will not offer any significant improvement to your wall s thermal performance. You can get similar results as doing all closed cell foam but with less cost.

Nor will that approach address thermal bridging through the studs. Foam it green spray foam insulation can be combined with other insulation to make a powerful hybrid method. Foam board insulation can add insulation and eliminate thermal bridging when used in wall and ceiling assemblies insulated with batts. This home has 2 of closed cell foam i.

Understand that the function of the vapor barrier is to prevent moisture from migrating from the warm side into the total thickness of insulation towards the cold side where at some point the temperature gradient will drop. Combining rigid and foam insulation. 2 foam on all basement exterior walls. Rigid foam insulation uses one of three materials.

Yes foam board insulation is an excellent complement to batt insulation. Airspace rigid foam batts vapor barrier plastic drywall. It had 1 2 foil faced thermax on every interior cold wall and ceiling. These are panels of rigid foam sold in 4 by 8 foot sheets in a variety of thicknesses from 1 4 to 2 inches it is also sold in large bundled panels joined at the ends accordion style for use as an exterior sheathing material.