After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
How to tie a new roof to an existing roof.
The ends of the shed rafters.
The big idea is that layers of the lower roof should sit below corresponding layers of the upper roof.
Depends on the slope of the new roof.
You ll need to remove the existing shingles and cut back the existing eaves to make room for the shed roof then nail a two by six ledger board on the existing roof.
Tying in to an existing gable 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.
The new flashing should go under the old felt and over the new felt and new roll roofing.
If you don t remove the stone and you put new roof over it the water will get underneath the gravel so make sure you clear it away.
Then mount new trusses on the new addition walls.
After nailing down these two boards dab roofing cement on the nails and along the outside edge.
The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
Set the last truss or set of rafters for the new roof at the outside edge of the existing roof.
Now take the 4x4 beams and erect them to the perimeter outside the porch about four feet apart.
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Roofing nails to the existing structural sheathing.
The roofing cement will resist possible leaks overnight.
First the 4x4 beams need to be cut to the size of the existing roof so the porch roof and the edge of the existing roof will be even when the job is complete.
The lower the slope the further it should extend.
Chip away the existing gravel exposing the stone underneath.