Hot/Cold Addition-Herndon, VA

Monday, March 6th, 2017 by Justin Dobson

Challenge

This Herndon, VA homeowner was having trouble heating and cooling this wonderful addition they built a few years ago. Upon a thermal camera investigation we determined there to be loose fiberglass batts (which don't stop air movement) under the addition.

Solution

The old plywood was removed, and the fiberglass batts taken out. Closed cell spray foam was used to air seal and insulate the bottom of the addition. This keeps the hot/cold air away from the floor. The fiberglass batts were re-installed to add thermal protection and fill the rest of the cavities. New, white, composite boards were installed to make it look good and keep things in place when done.

Project Summary

Evaluator: Shayne Sandner

This addition was built with no conditioned space beneath it, causing this room to be hotter and colder then the rest of the home.

The old plywood was removed to access this area above.

A close up of the plywood.

The empty cavities are shown here after the plywood and fiberglass batts were removed.

Closed cell spray foam insulation was installed (R19). Once the fiberglass batts are added back to fill the cavity the R value jumps to R49....way above code requirements.

New composite sheathing was installed for aesthetics and to keep air out.

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Hot/Cold Addition-Herndon, VA

Challenge

Solution

Project Summary

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