How to Trim an Exterior Window | This Old House

Most of the new windows are in at the Arlington house. Tom Silva is starting to trim the windows using a PVC product. He shows Kevin his special technique of using a rabbet joint to connect the top and side casings

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Tom Silva shows Kevin O’Connor how he’s trimming the new windows on the exterior at the Arlington house. PVC trim of over 1-inch thick is used as flat stock around the window. To make a nice joint, he makes a rabbet cut in the top head casing and then a rabbet cut in the side casing so the pieces lock together. He extends the window sill out on either side of the side casings for a nice traditional look. The side casings are glued and screwed to the sill with pocket screws. The frame is assembled and then Tom runs a bead of caulking around the top and sides of the window where the frame will go. Tom and Kevin place the entire window frame over the glue and screw it into place.

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This Old House is America’s first and most trusted home improvement show. Each season, we renovate two different historic homes—one step at a time—featuring quality craftsmanship and the latest in modern technology. We demystify home improvement and provide ideas and information so, whether you are doing it yourself or hiring out contractors, you’ll know the right way to do things or the questions to ask. Our experts including general contractor Tom Silva, plumbing and heating expert Richard Trethewey, landscape contractor Jenn Nawada, master carpenter Norm Abram, and host Kevin O’Connor give you the tools you need to protect and preserve your greatest investment—your home.

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How to Trim an Exterior Window | This Old House
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