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-   -   Insulate bottom of bay window (http://www.diychatroom.com/f103/insulate-bottom-bay-window-111484/)

ftcbski 07-21-2011 11:25 AM

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!

parts 07-21-2011 11:59 AM

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

HomeSealed 07-21-2011 04:27 PM

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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