Insulation for Older Homes

The 3,200-square-foot duplex in Arlington, Mass., used roughly 1,400 gallons of home heating oil before being retrofitted for energy efficiency.

Walls were given two layers of 2-inch polyisocyanurate rigid foam board.

Installers had to figure out how to install the two layers of 3-inch rigid foam board on the roof. The product was 2 inches thicker than the roof foam they were used to.

Once the two layers of foam were installed, plywood sheathing was laid on top.

Workers screwing in the sheathing to the foam.

The 10-inch screws used to secure the new roof deck, 6 inches of foam, and old roof deck into the rafters.

The thickness of the foam boards can be seen around the new windows.

Even the underside of the house gets foam board in order to wrap the entire house in a protective skin.

Furring strips were attached to the foam board to create an air space behind the siding. The space promotes drainage, allowing the house to dry out.

The complete house wrapped in foam board and furring strips.

The attic and basement ceiling were sprayed with Icynene open-cell foam insulation.

Contractors installed NuCedar cellular PVC siding over the furring strips.

The pre-finished cellular PVC siding is virtually maintenance free and will stand up to the elements. The holes provide movement for expansion and contraction.

The detail shot shows how the window detail is handled with the extra thick foam board.

The house with its new siding, windows, and trim installed.

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