How to replace a single pane basement window using professional techniques
In short: Replacing a broken window pane is a manageable task for homeowners, provided you are working with a single-pane unit. General contractor Tom Silva demonstrates a precise method for removing old glass and installing a new pane, ensuring a clean fit and a weather-tight seal using standard tools from home centers.
The process begins by removing the window from its frame. Safety is paramount, so you must wear gloves, safety glasses, and a mask to protect against glass shards and potential lead dust. Using a HEPA vacuum while scraping away old glazing helps keep airborne particles to a minimum. Once the glazing is cut with a utility knife, the damaged glass can be carefully pried out.
Accurate measurement is critical for a successful replacement. When working with a wood frame, you should subtract 1/16 inch from the opening dimensions to account for the natural expansion and contraction of the wood. To cut the new glass, dip your glass cutter in oil, score the line once using a straight edge, and snap the glass cleanly over the edge of your work surface.
Installation involves applying a bead of glazing putty into the opening, setting the glass, and securing it with glazing points pushed into place with a putty knife. A final bead of putty is applied over the top and smoothed out. While the glazing requires a couple of days to dry, the window can be reinstalled immediately. Once fully cured, a razor blade is used to clean up the edges for a professional finish.
It is important to note that this specific technique is designed exclusively for single-pane basement windows. If you are dealing with double or triple-pane windows, the internal seals are more complex, and the entire unit must be replaced rather than just the glass. All necessary materials, including glazing points and cutters, are readily available at most home improvement stores.
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Sources
- Summary by Intellect · source: How to Replace a Broken Window Pane | Ask This Old House
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