Uninsulated Bay Window
There are millions of bay and bow windows like this with uninsulated sills, allowing cold, drafty air into the home. The only protection this home had from the outside air was the 3/4" piece of plywood that is the windowsill.
The window sill, despite being nailed in place, still had gaps that allowed too much air leakage. Sealing those gaps with foam and caulk was Larry's first step in alleviating the drafts.
Next, Larry screwed in our 4" SilverGlo insulation. SilverGlo is expanded polystyrene foam insulation that has been infused with graphite, which increases its R-value 24% over standard EPS foam!
A layer of plywood was added to protect the SilverGlo from possible damage over time from weather or animals. And, since air sealing is the key to stopping air leaks, Larry took the time to caulk the perimeter of this layer, as well.
Finishing the Edge
To protect the edge of the plywood and the SilverGlo, Larry added a vinyl 6" skirt board to finish the job. This homeowner can now enjoy a significantly more comfortable and energy efficient room.