Using two inch by four inch studs build a frame for columns that stand from the porch floor to the soon to be built roof.
How to connect a new roof to an existing roof.
After that to make it flush with the roof of the existing house cut the two outer rafters.
Shingle the addition roof letting the new shingles fold through the valley center and onto the old roof deck by at least 1 ft.
You ll need to pull any nails within about a foot of the valley line so that you can slide your valley flashing up under the old shingles.
Attach the horizontal beam by using a nail gun.
Bed the end of each shingle in a 2 in wide ribbon of roofing cement placed 4 in.
I use steel valleys.
Cover the column frame with siding brick or any outdoor material that matches the exterior of your home.
The ends of the shed rafters.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
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Brace the column frame in place using l brackets and concrete screws.
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.
Frame your new roof.
Tying in to an existing gable roof.
Figure out where the new roof will be on the old one and cut a line up the old roof shingles about 3 away above from this valley line.
Re lay the shingles you removed from the existing roof.
Remove siding from the house where the new roof will attach to expose rafters or other framing of the old roof.
Connect a flat roof to a sloped or pitched roof with a ledger board.