Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load.
New gingles on roof.
Try on a new roof shingle style boards build your roof 2020 shingle color of the year design inspire get started financing your roof find a contractor.
The shingles should jut out from 1 4 to 3 8 inch 7 to 1 cm over the drip edge.
Then there are high end roofing installations.
On average a new roof can range anywhere from 6 000 to 17 000.
Every 5 inches make a new mark until you get to the rop of the roof.
Nail a horizontal row of shingles over the drip edge.
Meanwhile the most popular roofing material asphalt shingles may cost 4 000 to 6 200 for a full installation.
Use the chalk line to snap a straight line vertically every 6 inches.
Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Repeat this on both sides of the roof.
A metal roof may cost between 5 000 to 27 000.
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Leave the old valley flashing in place and install new over it.
That s also why building codes commonly limit re roofing to no more than two layers.