Combining Foam Board And Batt Insulation

In this case i am assuming that the plastic will prevent indoor humid air from getting inside the wall.

Combining foam board and batt insulation.

Fiberglass devoured the insulation industry in the 1970s for obvious reasons. Foam board insulation is easy to use and is a great diy way to add some insulation. To insulate the underside of ceilings. Some types of thicker foam board insulation are available but they may need to be special ordered.

Cut n c plywood so drywall can fit just behind the bottom of the upper cabinets by 1 inch. Batts in stud bays first then 1 foam panels to the inside of the room then drywall. Finish with plastic stapled to the studs then drywall. It s in southern illinois and i m trying to get some good advice on whether i should be concerned about vapor barrier and if the fiberglass batt makes this better or worse.

Would having the ridged foam between the drywall and the fiberglass bats prevent moisture from migrating into and condensing in the walls. When you use foam it green closed cell spray foam for the first 50 of the r value and then use fiberglass or another low cost insulation to get the air barrier and high starting r value and then add in more r value. Thinking of going with 1 of rigid foam board and then adding a fiberglass batt on the inside of that. Flash and batt is a hybrid insulation approach combining fiberglass insulation and closed cell spray foam.

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. Use batt or foam or cellouse in the wall stud cavity as you like. We like fiberglass batting for northern california homes because it is easy to install and waterproof. Halo interra foam board insulation can be applied to the studs covering the batt insulation.

Flash and batt is a combination of spray foam insulation with fiberglass batts. With the old house the 2x4 studs are actually at least 4 not 3 5. Halo interra foam board insulation is applied to the foundation wall and batt insulation is applied afterward. Flash and batt insulation is one example of a new technique being implemented by insulation contractors.

Perhaps adding a foam strip on the studs to create an air gap between the foam board and the back of the drywall. While installing batt insulation can be a potential diy project it s best to consult with a professional. Cover with foam attached to the studs and cover foam with 3 4 inch non com plywood to maintain fire rating for wall behind cabinets. Insert foam board between the studs to seal everything up tight and then install fiberglass batts over the foam board.

It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.