Can I leave a layer of tyvek over the 1st course of 1 1/2 foam when adding another course?
I got a surprise when i stripped the vinyl siding off my walls..I expected XERO exterior foam but found 1 1/2″ covered by a layer of tyvek.
Q- Is there any harm in leaving that layer there and adding another when I complete the addition of a second course of 1 1/2″ foam (total of 3″).
I will be using 3/4″ furring strips at each stud and furring around the windows…
a follow-up question will deal with how to detail the foam around the windows with 6″ wide furring at the edge of the Dudley box (furring to permit 4″ wide exterior window trim and room for J channel).
I’m working now and would really appreciate a GO/NO GO on leaving the orig tyvek soon…
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