Up from the valley center and cut through the shingles and underlayment.
Tying in a new roof to an existing roof.
The roofing cement will resist possible leaks overnight.
Tying in to an existing gable roof.
The big idea is that layers of the lower roof should sit below corresponding layers of the upper roof.
The lower the slope the further it should extend.
Depends on the slope of the new roof.
Tie into the end of an existing gable roof by removing existing facing boards wall siding and any other obstructions back to the first truss of the old roof.
A roofing diagram is on every package of shingles home depot or lowes.
Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.
When a shed roof ties into an existing roof the new roof could be a simple lean to that covers a deck or porch or it could be the shed roof of a substantial addition.
Sep 12 2020 explore peter baker s board roof tie in on pinterest.
Then mount new trusses on the new addition walls.
Attach the horizontal beam by using a nail gun.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
After nailing down these two boards dab roofing cement on the nails and along the outside edge.
Connect a flat roof to a sloped or pitched roof with a ledger board.
Once you cut the old shingles back 36 or less work the new section into the old.
Using new shingles to run your valley.
In any case the structure.
You will be using new shingles for tying in you old and new shingles.
Hope i helped somewhat.
The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
Roofing nails to the existing structural sheathing.
Now you can begin assembling the outer rafters and attaching the rafter beam to the edge of the roof of the house.
Butt the first new truss against the old one.
After that to make it flush with the roof of the existing house cut the two outer rafters.