I am building an enclosed porch and just now attaching the
rafter header to the house. The current siding is wood
shingle. It will make a mess of the shingle above and below
to remove a row to attach the header. Can I just nail/bolt
the header right to the siding? Behind the siding is
1/2" ply and then upright 2x4's. I plan to used galvanized
4" nails and try to hit as many of the 2/4's as possible.
Is this ok to do? My guess is that the rafter header is not
bearing a big amount of weight even under snow load, but
rather the weight goes down to the beams on the front of
the porch, and pushes back against the side of the house,
rather than directly down on the rafter header.
Uh...I don't think you're going to get points for 'trying' to hit the studs.
You really should cut away the shingles, install flashing and - if through
bolts into a rim joist aren't possible - put long lag screws into the studs.
I also agree about the flashing, but you can preserve the siding below
the roof by tacking your header boards to the wall with 2 or 3 nails
in each board (leave heads stick out). Run a pencil along the bottom
of the boards. Remove the boards and take a circular saw and set the
depth the approximate thickness of the siding. Then carefully follow
the line. That way you can preserve the siding below the roof and
only have to remove the stuff above. You will have to apply flashing
somehow, and siding removal is the only way.
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