Exterior Wall Insulation Thickness

Most used when framing the exterior walls of a house.

Exterior wall insulation thickness. Best for interior and exterior walls in cold or humid climates especially for homes with masonry or wood walls. An external wall insulation system or ewis is a thermally insulated protective decorative exterior cladding procedure involving the use of expanded polystyrene mineral wool polyurethane foam or phenolic foam topped off with a reinforced cement based mineral or synthetic finish and plaster. Most manufacturers produce an r 13 batt that fits into a 2 by 4 wall cavity which is. The total up charge for my hypothetical house would be 1 020.

Once the insulation is in the wall and sealed up with drywall it is not easy to change out. Standard fiberglass insulation batts or blankets provide an r value of 2 2 to 3 8 per inch of thickness. Window and door jamb depth needs to increased with 2x6 walls. Larger houses or ones with more exterior wall surface area windows and doors will obviously cost more.

These extension jambs cost 575 in my example. The extra thickness fiberglass insulation added 145 to the cost. When you are insulating two by four 2x4 and two by six 2x6 framed exterior walls and want to use fiberglass insulation what thickness is best the question becomes all more critical because of the permanent nature of wall assemblies and wall insulation.