Where do I caulk on new window retrofit?
x_navyfc
| Posted in Construction Techniques on
This weekend I plan on installing new windows in my garage using the same method from the attached FHB article from the website archives.
After everything is flashed and the window is installed, I will be creating ‘picture frame’ trim around the window using PVC.
The article really didn’t address where to apply caulk.
My thoughts-
Outer edge of PVC trim where it meets the wood siding: Caulk top and sides but leave bottom empty so any water can drain out
Inner edge of PVC trim where it meets the vinyl window: caulk all pieces of trim
Thoughts?
Thanks in advance
Brandon
Replies
When using PVC trim you want to make the trim in a single frame. Use pocket screws and PVC cement (if using Azek they have a special glue that is slower to cure so gives you more than a few seconds to attach the pieces) to join the PVC joints. I also cut a rabbet in the trim so that the trim lays flat against the nailing flange and the sheathing. The frame should allow about 1/8" (or just over 1/16" ) on each side, top and bottom to allow caulking. Caulk on all four sides of the "inside" of the trim (between trim and window). Don't caulk the bottom of the "outside" of the bottom trim piece to allow water out. I also put a kerf cut in the bottom trim piece to kick any water out from curling under the trim.
Thanks for the advice!
a little off topic, but I looked in a fairly high end neighborhood new builds at the wooden "entrance door unit with attached sidelights" set into brick wall ---and several homes had no caulk between the unit and the brick.
is air sealing done some other way?
Thank you
Hopefully, it was done with the flashing tape. If you are depending on caulk to keep water from penetrating your walls you're already in trouble. The primary purpose of caulk around doors and windows is cosmetic. Caulk is always going to fail, the problem is that you won't usually know about it until you see water damage.