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Old 07-21-2011, 10:25 AM   #1
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Insulate bottom of bay window

I have a bay window which extends out about one foot from the house. The bottom of it is not insulated. It looks like I could install 1.5" thick foam insulation. 1) Is that the right approach? 2) Would I need to cover the insulation say with exterior plywood or something else?

Thanks for any advice you are willing to offer!


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Old 07-21-2011, 10:59 AM   #2
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Yes it's the right approach, you could even install more if you extend the trim down. It should be covered also exterior plywood or nicer stuff if visible. I see stuff like this all the time even in new houses I work on for some reason most bay windows have little or nothing on the tops and bottoms of them and builders rarely do anything about it


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Old 07-21-2011, 03:27 PM   #3
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We typically add a 2" piece of XPS (R10) and then bend up some aluminum to dress up the edges... You'll notice a big difference in the temp of the seat board, as well as condensation if that is an issue for you.
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