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Question DetailsAsked on 10/18/2013

I had vinyl replacement windows installed, the installer didn't use any sill tape. Is this correct procedure?

New build vinyl windows with integral flange were removed. house doesn't have house wrap installed. the new windows were centered on a 2x6 wall leaving 1 inch of sill exposed past the exterior of the window. j-channel and exterior flashing were then installed. I asked installer about the sill flashing tape and was told that was for new build only. They didn't seem to understand the difference between house wrap (tyvek) and sill tape (protect-o-wrap or butyl tape).

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1 Answer


Sounds like you know more than they do - I would suggest you show them this article -

and have them come back and do it right. They should have either water shielded the entire opening before installation, or at least Tyveked the top and sides and water shielded the bottom and about 6 inches up each side, at a minimum, in addition to ice and water shield all round the outside as the J-channel and flashing were applied.

It would help if you could find this requirement on the window manufacturer's website too - so they could not argue so easily that this is extra cost work.

Answered 7 years ago by LCD

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