Vinyl Siding on Bay Window = Funny Angles

Old 04-13-10, 07:15 AM
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Vinyl Siding on Bay Window = Funny Angles

Morning everyone, I am about to start a vinyl siding project, and Im just trying to determine how to proceed with my bay window. I really only need siding on a small area above the window, about 12 inches tall (the rest is brick). The area consists of 5 rectangles (approx 12 inch tall by 18 inches wide each), joined at about a 15 degree outside corner. Im using horizontal vinyl siding, but what should I use for these off-90 outside corners? Ive heard people say that both inside 90s and outside 90s and be modified to fit an odd angle. Is this the best way to proceed, and if so how do I do it?

Old 04-13-10, 09:40 AM
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I would use an outside corner. I guess there is an overhang that the OS corner would butt up to? Install flashing at each corner or flash the entire bay area. You can cut (with a little practice) a piece of siding to make a filler for the bottom of the OS corner if you'd like. Anyway, cut the OS corner to length, warm it a little (usually friction by rubbing your hand briskly over the edge of the corner) then place the corner nail flanges on a smooth surface and push to spread the angle out from 90 to the angle desired. For the inside corner just install 3/4 J channel. You can also use for the OS corner, a quarter round insert and two J channels. This takes a little more time and makes a smaller corner. The method would be to cut the J channels and Qtr round insert to length then pop rivet them together then install.

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