I’m helping a friend attach a portico to the front of his house. We laid out the roof line and cut the aluminum siding so that the first set of rafters could be nailed directly to the wall of the house. We have a plan for flashing the tops of the rafters but are unsure how to flash the area where the plum cuts of the rafter tails intersect the wall. Anyone have a suggestion on how to flash those areas?
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The sidewall flashing should terminate with a "kickout flashing". The water should not be allowed to run off the roof and down the face of that fascia at the wall line. The siding then can be butted to the fascia and caulked.
I think you have opened a can of worms by cutting the siding. If I'm reading this correctly you plan to have an open rafter portico with each rafter butted directly to the sheathing exposed by the removal of the siding, no roof, yes?
And, just flashing the tops of each rafter leaves a gap between each which must now be closed up with something, yes?
If your plan includes a real roof, then I would use continuous flashing up under the siding and house wrap and over the roof sheathing and underlayment. You can then just disguise the cut out siding from underneath later.
A photo of the current state of the job and the extent of the exposure to be flashed would be really helpful.
Unfortunately, we discovered just how big the can of worms was after we cut out the siding and built the roof...You are correct - we cut the siding to match the rafters, leaving ~1" between the cut line of the siding and the top of the rafters so that we could fit sheathing, felt paper, and shingles on the rafter, and also insert j-channel and flashing up under the siding along the length of the rafter. The J-channel and flashing was installed before installing the rafters. It wasn't until after we inserted the flashing and built the roof that we realized that we had a real problem at the rafter ends.So now we have flashing tucked up behind the siding that runs from the peak of the portico to the start of the plum cut on each side of the roof. I'm guessing that the kickout flashing (and a boatload of silicone caulk) that jimAKAblue suggested is the solution. I have a real uneasy feeling about preventing all water from seeping behind the siding...