Q:
I’m installing T-111 plywood siding on an outbuilding with several windows and doors. How should I flash the windows and doors?
Humphrey Russel, Woodbury, CT
A:
John LaTorre, a contractor in Tolumne, California, replies: T-111 is best installed over tar paper or housewrap stapled to studs. The best option for windows is the type with a vinyl flange all the way around. Weatherproof the opening using self-adhering flashing such as Grace Vycor (www.graceconstruction.com), as shown in the drawing. Install the window, and tape the flanges to the housewrap or tar paper with flashing tape such as Tyvek Contractor Tape.
Now you simply side around the window. You can add any style of trim without affecting the weather performance. If you choose a protruding exterior sill and built-up top trim, make sure the sill slopes away from the house, and if the protruding top is not well protected by the roof overhang, add a small piece of L-shaped flashing on top, which is caulked fast to the T-111. If your windows have brick mold instead of flanges (your door is most likely configured this way), weatherproof the opening the same way, but skip the Tyvek tape. Side around the brick mold. Leave 1/8 in. or so between the window or door and the T-111 for caulk.
View Comments
please, go a bit more and actually give us a diagram of what you do after this nice little typical wrapping system...
show us a sectional view of where the flange sits, and how to trim up to the window, the window does not extend enough to clear both the t1-11 and the trim ... this explanation does not yet show us what to do ... just lets us make guesses, and im seeing problems with my guess ... please make a really nice detail drawing of how you did this, and how you catch the water that seeps into the flange area, that is normally carried away by a sill system, and what you mean by caulk fast to the t1-11, how about a slight angle kerf cut for the top clashing to stick into ... (metal causes condensation and rots the header usually ) ... so please one more time, with a nice set of details please ... thanks, peace ... meanwhile ill be scratching my head ...
I am installing an aluminum window with a nail flange in an exposed wall (no overhang) and know how to seal it to the wall Tyvek. Looking for the detail of how to interface the T1-11 to the wall/window. Yes, sectional view of the options would be appreciated!