The roof should be in sound.
Roof framing over existing roof.
How to increase the pitch by building a roof over an existing roof use premade roof trusses.
How to install a roof over an existing roof determine the feasibility.
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.
Position the square at the end of the rafter board with the tongue on your left and facing away from you.
Multiple layers of shingles can make it difficult or impossible for the nails to penetrate.
On the gable ends this was pretty easy.
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.
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.
Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge.
Add the length of the overhang beyond this mark and.
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Remove the top several levels to.
Inspect the condition of your current roof.