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Community and Q&A

New window installation/ wall assembly

Jcroley10 | Posted in Green Building Techniques on

I am planning to soon install a large living-room window on an exterior wall.  Climate Zone 5 – Windsor, ON.  The wall is 1950’s stone veneer but will be brought back to wood framing to re-shealth and insulate, etc.

My plan thus far:

1/2” OSB

1-1/2” EPS foam

Tyvek house wrap

Window opening flashed appropriately

Flanged window

Vinyl siding

My question is the detail regarding flange connection.  Should a wood piece be fastening to the outside on top of Tyvek and then window attached to it then flashed and later sided with vinyl?

Other questions – rainscreen needed?

Thank you,


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  1. GBA Editor
    Martin Holladay | | #1

    Here is a link to an article that should answer your questions: "Installing Windows In a Foam-Sheathed Wall."

  2. GBA Editor
    Peter Yost | | #2

    hi Jon -

    With regard to this part of your question: do you need to do a rainscreen detail with vinyl siding? The answer is no; since we "hang" rather than fasten vinyl siding as cladding, there is so much air flow through the courses of siding that it acts essentially a lot like a rainscreen cladding, in terms of free drainage and air movement. I don't know if I would go so far as to call it air flow with vinyls siding I since the pathways are a lot less dedicated than with true rainscreen systems), but it does have enough air movement to promote drying.


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