Position the square at the end of the rafter board with the tongue on your left and facing away from you.
Roof framing over existing roof.
Inspect the condition of your current roof.
Premade roofing trusses will be easier and take less time than installing a stick built roof.
On the front of the roof edges the original roof deck sheathing was cut back flush with the wall and the fully adhered membrane folded down around the rafter tails to catch the.
How to install a roof over an existing roof determine the feasibility.
The roof should be in sound.
How to increase the pitch by building a roof over an existing roof use premade roof trusses.
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Add the length of the overhang beyond this mark and.
Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge.
One of the keys to over roofing is to tie the air control layer of the roof assembly to the air control layer of the wall assembly.
Multiple layers of shingles can make it difficult or impossible for the nails to penetrate.
The fully adhered membrane wrapped down over the cut back roof deck to tie into the wall water control layer and air control layer photograph 11.
You ll need to remove the siding where it meets the roof.