New windows question reguarding tyvek

Old 03-01-09, 07:56 AM
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New windows question reguarding tyvek

Hi all,
Presently installing new construction windows (double hung) to replace the old ones that are 30+ years old and pretty much served there usefullness. Okay, I live in a townhouse (7 years now) with association rules I have to live by. Originally the home was T-11 and about 15 years ago it was vinyl sided. Before siding was applied, foam board insulation and then a layer of tyvek applied over the foamboard. I took off the trim on the inside of the house to get the rough opening measurements and noticed when the townhouses were built originally it appears that a house wrap of any type was ever used due to the fact that nothing is attached to the winow opening. Also when the vinyl siding was installed, the foamboard and tyvek ran only to the trimboard (3 inch perimeter around window)) as well as the siding ending in a j channel to the trim. My concern is the window opening. I would prefer to have it wrapped before I do any kind of window install. I would like to know if I could tape a piece to where it was ended during the vinyl install and then cut and wrap the window opening as per window install directions. I would like to tuck and overlap the new piece under the exicting and then tape it but I know the association would have a fit if I started taking siding off even though I am a licensed contractor.

I have been trying to get things done around here for a while and basically we have (new pavement in parking lots, new roofs, new pool and decking, etc). The problem with the window install if I waited until we, being the association, would be that it would be another 2 or 3 years before the association would tackle the issue and I cannot wait any longer for two of my windows are in such sad shape I am afraid they will blow out given a good wind not to mention the energy loss I am currently experiencing.

Maybe I will get lucky when I remove the exterior trim boards and I will find that there is a house wrap there I can tie into but I will not know for sure until my windows arrive in about 2 to 3 weeks.

So can I tie into the existing tyvek with the appropriate tape and then treat my opening as new construction by cutting and wrapping the opening? Also when I replace the exterior trim I was thinking about a composite type board...any recommendations.
Old 03-01-09, 10:41 AM
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I question the application of Tyvek over foam board, but that is what you have to live with. And, yes, you can tape tyvek over existing tyvek to give yourself a complete wrap into the window sill and frame area. Use Tyvek tape when applying the complimentary tyvek.
For composite boards, we use either Miratek or Azek. Check, first to see if it will be ok with the association, as it's design may not blend with the others.

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