Remodeling the 1930s wood-framed building we live in, and ready to make new openings to install new windows. It's difficult to describe how the walls are so I made a diagram below.
Basically, from outside to inside: T1-11 siding nailed to OSB, nailed over original clapboard and tar paper, nailed to original balloon framing, which is gusseted to a newer 2x4 interior wall that was added at some point.
There is essentially no overhang from the roof at all, so the new windows will get a lot of water. I've purchased a few new construction windows, which have nailing flanges. Assuming I can make these work, but not sure. After internal framing, I'm considering:
- Cut rough opening
- Cutting back just the T1-11 back to make room to nail the flanges directly to the OSB (which will be backed by new framing where needed)
- Apply flashing/flex tape to sill
- Coerce/wedge a drip cap wedged under the T1-11 at the top.
- Install, nail up and caulk the window
- Trim to make it nice.
Considering another approach, but not sure. Might be easier because I could install the windows from the inside. After internal framing:
- Cut rough opening, with room as needed for new exterior sill and jambs
- Install new exterior sill, jambs, and drip cap, to waterproof the opening; aluminum or similar
- Install some form of molding/stop to then take the window from the inside, after removing nailing flanges
- Put the window in, make it nice, caulk and foam, etc
SO- Will either approach work? Or is there a door number 3 I should be thinking about?