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In this video, This Old House general contractor Tom Silva explains how to replace a basement window.


1 Remove the sash from existing basement window.
2 Use reciprocating saw to cut through the window frame.
3 Pull out the old window frame from wall opening.
4 Use hammer and cold chisel to chip away mortar from sides of opening, if necessary.
5 Slide new window into the opening.
6 Use shims to center new window in the opening.
7 Secure window by screwing up through its frame and into the mudsill.
8 From outside, apply caulk along the sides and top of the window frame.
9 Spray urethane foam under the sill to seal the bottom of the window.
10 Apply a coat of exterior-grade primer to all bare wood window parts, followed by two paint topcoats.
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