When installing exterior window trim (just some 1" x 4" boards), how do you fasten them to the house without hitting the windows nailing fin and weather proofing material on top of them?
For example, a vinyl window is installed into the frame with nails or screws through a fin that has holes in it. This sits on the exterior side of the frame. Then you put tape over it. I imagine when installing the exterior trim boards, you don't want to puncture the fin or the tape, but then I don't see how you can install the trim because the fin is at least 1" and the tape more like 4", but the trim board is only 4" wide.
Best Answer
Personally, we regard flashing tape as self-healing, to an extent. At least, to the extent that we don't worry about a few finish nails going through it.
See, that tape and those fins are really just to deter condensation, not full-blown rain leaks. A couple pin-holes are acceptable.