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On this project, we’re using rigid foam insulation, which is also serving as our secondary weather barrier, so we don’t have housewrap going on the building. If we did have housewrap, we would typically fold the sides of the housewrap into the opening.
Protect the rough framing from possible leaks
On this job we have to protect the wood on each side of the opening, should any water leak in around the jamb of the window and drain down here and get into the sill pan.
There are a few choices for framing protection
For that we can use a couple of different products. We could use some pieces of housewrap, some tar paper from typical roof underlayment—or in this case, we’re going to use some synthetic underlayment, used on roofs typically. These are just some scraps left over from jobs; we cut them into strips and we use them just to line the inside of the jamb opening. Now if any water leaks behind the flange of the window and gets to the membrane, it’ll drain down and onto our self-draining sill pan.