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.
Tying in a porch roof to an existing roof.
Then mount new trusses on the new addition walls.
How to tie a additions roof to existing roof roof designs to attach to existing home how to construct a roof from an exsisting shead how to attach a deck roof to existing roof how to add a roof over porch cost to tie into existing roof attache porch roof on house attach shed roof to house adding a roof to screened in porch adding a roof to existing.
You can either remove the eave or just keep it.
Butt the first new truss against the old one.
Now take the 4x4 beams and erect them to the perimeter outside the porch about four feet apart.
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.
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.
Attach a sill plate to the house between the two side supports of the porch.
Measure the sightline clearance height from the roof to the house not the other way around.
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.
Tradesman use them mainly.
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.
Step 4 position the rafters on top of the sill plate.
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.
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 have to make.
Measure the size of the beam that you are going to use.
Using lag bolts and a screwdriver fasten the base of the posts to the ground.
This will provide a solid framework for attaching the metal panels.
In any case the structure.