How to Insulate Window Casings

The window casing is the trim that surrounds the window, and, during the winter, it can lead to some cold drafts entering your home. There is a shallow spot underneath the window casing that can be insulated, and doing this can save you some cash during the winter months. Removing the window casing requires some expertise with home improvement, but applying the insulation is quite easy.

Putty knife
Screwdriver
Hammer
Pliers
Measuring tape
Rigid polyisocyanurate insulation
Utility knife
Double-sided tape
Nails
Adhesive caulk

Instructions

- 1
  Inspect the edges of the window casing where it meets the walls and determine how it is held to the wall. Some methods include adhesive caulk, screws and nails.
- 2
  Slide a putty knife along the edge of the window casing where it meets the wall. This removes any paint that might be holding the casing to the wall. You can also break the caulk seal holding the casing to the wall, if there is one present.
- 3
  Remove any screws or nails holding the casing to the wall. A screwdriver can be used to remove the screws, while the claw end of a hammer or a pair of pliers pulls up the nails.
- 4
  Pry the casing away from the window using a pry bar, and set it aside. Work carefully so that you do not bend or break the casing.
- 5
  Measure the hollow spaces behind the casing using a measuring tape
- 6
  Cut rectangles of rigid polyisocyanurate insulation to match the measurements you found in in Step 5.
- 7
  Slide the rectangles of rigid polyisocyanurate insulation into the hollows. If you cut them correctly, they should stay in due to friction. If not, you can use a small amount of double-sided tape to hold them in place.
- 8
  Reattach the window casing over the window using a hammer and nails or adhesive caulk to put it back in place.

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