Existing roof existing roof 10.
How to build a lean to roof on existing roof.
Design lean to roof per your local building codes.
Front wall trims lean to addition.
Cut back the roofing on the existing building if needed so that the new roof can fit correctly beneath it.
Add roof existing deck add roof existing deck 12.
Place the starting panel onto one edge of the roof.
Add porch roof existing build metal over deck add porch roof existing build metal over deck 11.
Attach patio roof existing house attach patio roof existing house 13.
Place the rib inside closure inside the groove both overhangs will have this.
The lean to s roofing will need to fit fairly snugly underneath the existing roof to prevent rain from blowing into your addition.
Use 1 8 lumber for the side roof.
From this existing post measure 3 feet distance in the same line dig a hole and drive the second post in.
Space rafters either 16 o c.
The other side is for overlapping the panel.
For shingles or 24 o c.
Mark the area where you want the structure.
Measure 8 feet from the existing structure towards the outer direction and dig a deep hole to drive the post in.
Attaching patio cover existing roof attaching patio cover existing roof 14.
Determine where the lean to will be attached to the existing building.
The side of the panel that has a slightly flat side is to place on the roof.
When attaching ledger board to an existing wall install proper flashing when required.
Use right size of rafters and headers.
Fit the trims to the sides of the lean to roof and lock them into place with 6d nails.
The preferred spot would place the lean to under the overhanging roof of the existing building.
Attach patio roof.
In the case of a lean to roof over an addition the existing rafters will have to be cut away to accommodate the addition and the shed roof will require support where.
Any water runoff will flow off of the main roof and hit the lean to at an angle to prevent pooling and flooding in the lean to.
Typically a lean to roof will lay at a different pitch than your existing roof.