I have an old house, and two of the windows are still single paned. As part of my ongoing energy efficiency improvements, I wanted to reduce the air and heat leakage from them, and reduce condensation on the glass. Since it's not in the budget to replace them this year, I needed a reasonably priced fix.
I decided to add a pane of acrylic on the inside of each window.
- Clear acrylic panes (plexiglass, lucite, etc)
- Double sided foam tape (found in the weatherstripping aisle)
- Cove trim (optional) and fasteners
- Dessicant (optional)
- Work gloves (acrylic can be very sharp)
- Safety glasses (you like your eyes, right?)
- Measuring tape and pencil/pen
- Exacto knife
- Miter box and saw
- Caulking gun
- Hammer (if nailing on trim)
Step 1: Air seal the window
The first thing to deal with is air leakage. I got out the trusty caulking gun and caulked around the edge of each pane of glass, and filled in any gaps around the window frame. The caulk I used is water based clean up, so a wet finger made sure that I got all the gaps, and a damp rag cleaned everything off the glass. I used white indoor/outdoor 25 year caulk.
Let the caulk cure, per the tube instructions. You want the window and caulk very dry before you install the acrylic.