GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Housewrap WRB Left Exposed for Too Long… Add a Layer?

jamesboris | Posted in General Questions on

Hello, I’m finishing up a tiny house in Zone 2A, near Austin. In late May, I wrapped the house with Tyvek Commercial Wrap (9-month UV exposure rating). In mid-July, I installed the windows/doors with Zip flashing and stretch tape (6-month rating).

It might be April before I can install the siding (w/1/2″  plywood rainscreen), and we had a long, sunny, dry, record-hot (103+ many days) summer. So I’m worried about these UV ratings. Can/should I just wrap another layer of Tyvek over everything? I don’t want to staple through the window flashing… so maybe there I could hold the Tyvek in place with a little piece of tape, then hurry to install the rainscreen? 

Pretty rough/stressful realization that I just can’t make my deadline, but I don’t want to trade bad for worse…

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. Patrick_OSullivan | | #1

    It can't really hurt. But, you could also just use it as temporary protection rather than carefully installing and detailing the second layer.

    1. jamesboris | | #2

      Well, if I put it up, I don't want to take it down again. I'd have to patch all the holes under it. The detailing of the 2nd layer couldn't be that intense anyway, unless I pull the windows out...

  2. Expert Member
    Akos | | #3

    House wrap holds up for a long time, well past its official UV rating. If it is a matter of a couple of months I would not worry about it.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |