2/17/2024 0 Comments Glazing putty windowsI won’t lie that this can take some practice to get just right. Properly installed finish glazing putty should be installed at a 45° angle with mitered corners to allow it to shed water effectively. Remove excess putty from inside of sash and tool interior putty flush and smooth with profile.(Be sure to set point far enough back so that it lays behind the glazing rabbet.) Use a point driver or putty knife to insert at least one glazing point into each side of glass and an additional point every 12″.Pressing on the center of the glass can stress it too much and cause it to break. Bed a small amount of Sarco Type-M (or similar) putty in glazing rabbets and gently press glass into bedding. Only press the glass around the edges, especially on large pieces.Dry fit glass into sash to determine the correct orientation. Make sure the glass is evenly set into the puttied glazing rabbet and you only leave a thin film of putty on the interior side of the glass. Once you have the glass, in insert your glazing points (I prefer the diamond points because they are easier to hide behind the putty line). Make sure they are firmly in place and the glass is where you want it to be before setting your points. This will cause excess putty to squeeze out the inside. Insert the glass into the opening gently and apply firm pressure around the edges. This helps air seal the glass and prevents water from getting behind the glass due to condensation. Step #1 Bed Glassīedding the glass refers to installing the glass back into the sash in a bed of putty. A well glazed window should have clean straight lines of putty and none of it should be visible to occupants from the inside. You can work the putty until you are satisfied with the results. This beveled putty glazing is the big finish to all the restoration work and is typically the last thing done before finish painting. Old wood windows traditionally have glazing putty on the exterior of the sashes. If you want the complete step-by-step guide for restoring your wood windows, get your copy of Old Windows Made Easy. The following is almost an exact excerpt from the book. The nice thing about putty glazing is that if you don’t like the results the first time, you can scrape it off and try, try again until you’re satisfied. The good news is that it doesn’t need to be perfect, just done well enough so that it sheds water and seals the glass properly. Proper glazing makes for long lasting, well-sealed windows. This skill is one of the most important and difficult to get right. Continuing our focus on window restoration to mark the release of my new book Old Windows Made Easy, I decided to post about putty glazing today.
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