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Community and Q&A

How to install windows if I build with 2″ rigid foam?

Stripes7 | Posted in Green Building Techniques on

Hi. I live in zone 5. I want to build my house not only with 2 x 6 stud walls for extra insulation but also with 2″ of rigid foam as that is what the article I read said I would need so I don’t have a cold wall.

I do not think I want to have the rigid foam next to my house sheathing so I want to put the house wrap my lumber yard sells over the sheathing like normal before the rigid foam covers it. So I am wondering, should I install the house wrap like normal homes do and then build a 2.75″ deep x 2″ wide frame around the window opening nailed through the house wrap, osb, and trimmer stud so my window is on the same plane as my siding?

If this is the best option, what will I do to flash the window or the opening since it is built out?

thank you!

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  1. GBA Editor
    Martin Holladay | | #1

    You have two choices: you can hire a contractor familiar with these issues, or you can begin reading widely on the GBA web site so that you become educated on these issues.

    If you want to do the work yourself, here is a list of articles to get your started. This is just a sampling; you have lots of questions, you so may end up having to do lots of reading.

    How to Install Rigid Foam Sheathing

    Where Does the Housewrap Go?

    ‘Innie’ Windows or ‘Outie’ Windows?

    Calculating the Minimum Thickness of Rigid Foam Sheathing

    Window Installation Tips for a Deep Energy Retrofit

    Fastening Furring Strips to a Foam-Sheathed Wall

  2. Reid Baldwin | | #2

    I would add bsi-085: windows can be a pain from Building Science Corporation to the reading list.

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