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How to Insulate Window Weight Pockets

In this how-to video, This Old House general contractor Tom Silva shows an energy-efficient way to insulate old windows

In this video, This Old House general contractor Tom Silva explains how to insulate window weight pockets.

Steps:

1. Use a hammer and pry bar to carefully remove the wood trim from around the inside of the window, exposing the sash-weight pockets.
2. Cut strips of foil-faced rigid foam insulation to fit into the weight pockets; stack strips to completely fill the void.
3. Use foil tape to seal the joint between the window jamb and foam insulation.
4. Replace the window trim.