Measure the sightline clearance height from the roof to the house not the other way around.
Tying in a porch roof to an existing roof.
Using lag bolts and a screwdriver fasten the base of the posts to the ground.
Step 4 position the rafters on top of the sill plate.
From that point all the way to the lower end fascias you will need to lay a 2x size depends on your rafter framing size on each side that extends from the new ridge board to the bottom of the valleys fasten it thru the roof and into the existing structures roof rafters or trusses.
You can either remove the eave or just keep it.
This will provide a solid framework for attaching the metal panels.
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.
You have to make.
Attaching a roof to an existing roof.
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.
Now take the 4x4 beams and erect them to the perimeter outside the porch about four feet apart.
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.
Measure the size of the beam that you are going to use.
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.
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Tying in to an existing gable roof.
The sill plate or piece of wood that secures the supports to the roof should sit flush to the top edges of the roof support columns.
Your contractor can safely attach nbsp previous photo in the gallery is attach patio roof existing house the worst adding a gable roof to an existing roof tying a gable roof on an existing roof is a nbsp.
Then mount new trusses on the new addition walls.
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.
Butt the first new truss against the old one.