We are going to re-insulate and re-side our 1947 home with new Roxul ComfortBatt, IsoClad 2 1/4" foam boards and some basic kaycan vinyl siding.
I have been looking at how to flash a window and have concluded that I'll need to remove an existing window, flash the frame and re-install it. All of the guides I have read use an air barrier that is not included in the foam board, meaning they can cover the window frame and cut the wrap in order to fold it into the frame and flash properly.
Like this:
What I am wondering is, what is the correct way to flash a window when using an air barrier that is stuck to the foam board insulation?
I was thinking of buying the smallest roll of House Wrap and just cutting a section out to cover up the width of the window, but if this is not necessary i'd rather not spend the time/money.
I can't find anything in the Isoclad manufacturer's website or the product manual.
Thanks!
Best Answer
You got it. Just install a piece of housewrap over your window, going past the window, maybe 4"+. Then seal thw housewrap to your foamboard using housewrap tape, or flashing tape.
Then, refer back your drawing there and cut as necessary.
Remember, you can hide all bad cuts with the tape.
Alternately, just flash the entire window frame in wide flashing tape and walk away. A tiny bit more expensive, but much better job.
Good luck with your project.