What Insulation To Put In Exterior Walls?


Materials include loose fiberglass, cellulose and several types of foam-in-place insulation. Some contractors use a "dense-pack" installation (usually with cellulose) that can provide better thermal performance and reduce the likelihood of the insulation settling and leaving voids.


The best insulation for exterior walls is spray foam insulation if it is new build and retrofitting with loose fill insulation for existing homes. Paying for cooling your home in Phoenix during summer is expensive! It’s possible to cut down on those electricity bills with quality insulation.

R-TECH Insulation on Exterior walls

Insulating with PlastiSpan Insulation – Above Grade Exterior Wall (French)

Frequently Asked Questions

What kind of insulation to use on exterior of house?

The existing house has aluminum siding over the old cedar clap boards, over 1x planks. Due to budget constraints, we are using fiberglass batt insulation in the walls. 2/3rds of the exterior wall will be covered with a cement backer board, the Schluter-KERDI waterproofing membrane and ceramic tile.

What kind of insulation do you use for 2x4 walls?

Older homes, especially those pre-dating the 1950s, may employ two-by-fours that truly are 2 inches by 4 inches. In this case, use R-13 or R-15 fiberglass insulation. There is no 4-inch thick faced fiberglass insulation in batts or rolls on the common market. Insulation for 2x6 Walls

How is fiberglass used to insulate exterior walls?

The purpose of fiberglass insulation fasteners is to attach the clip itself to the frame, which then supports and secures the insulation with a material that has a low conductivity to avoid heat loss, fiberglass clips also provide a solid surface for fastening strapping (furring strips) and exterior cladding.

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