Leaky Cantilever & Porch Overhang in Rumson, NJ
Challenge
Porch overhangs, bump-outs, and cantilevers can often be overlooked and improperly insulated. In Rumson, NJ, this has resulted in cold floors above and cold ceilings below during winter. In summer, heat infiltrates through the soffits, radiating into the house and floors. These issues cause uncomfortable drafts and increase energy consumption, as more heating or cooling is required to maintain a comfortable indoor temperature.
Solution
We address these insulation issues by removing the soffit boards or wood under the porch overhang or cantilever and applying one of several solutions, depending on the structure. We can dense-pack TruSoft cellulose insulation by drilling holes in each joist bay and blowing in the insulation. Alternatively, we can install SilverGlo foam blocks to block each bay, then spray foam over the blocks and the bottom of the floor deck. Another option involves taking down the soffit board, installing 4” SilverGlo foam board insulation in each joist bay, and sealing it with expanding foam. We then reinstall the soffit board and seal it with expanding foam, effectively preventing outside air from infiltrating the house, thus improving comfort and reducing energy loss.
Project Summary
Products Used: SilverGlo, TruSoft, Spray Foam
