To tie into the side of an existing roof put a new roof truss on the walls of the addition brace it upright then snap chalklines on the shingles to mark the center line of the new roof valleys where old and new roofs will connect.
How to tie existing roof shingles.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
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The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
The roofing cement will resist possible leaks overnight.
I will be creating a new valley on one side and tieing into the existing shingles on the other.
This video shows the transition of a shingle roof to a metal roof.
I have a roll of aluminum flashing that i plan on putting over the felt at the roof intersection where there is about a 1 2 drop from the new roof osb to the existing roof.
After framing and sheathing the new addition s roof snap a line over the existing roof shingles.
I am almost done roofing it.
To do this we had to extend the plane of the shed roof out over the porch roof creating a small triangular extension of the existing roof.
You want to be about two inches above the very center of the valley itself.
The image below depicts the current status.
I put roofing felt down under the two rows of the existing shingles as shown in the image.
Up from the valley center and cut through the shingles and underlayment.
The most trusted miami roofing contractor professionally describes the installation of thi.
The bottom of our blind valley was about 30 inches short of the bottom of the porch roof so we extended the line of the valley down to the edge of the new roof.