Felt otherwise known as underpayment is required when.
Roofing felt lines assist shingles.
The purpose of the shingle underlayment is to provide an additional moisture resistant layer to back up your roof shingles.
Chalk lines should be snapped 33 5 8 above the eave line.
Many pros shingle in a vertical line up the roof because it s much faster.
Known in the trade as vertical racking or staggering this how to lay shingles method enables the roofer to install a single column of shingles all the way to the peak without the wasted back and forth motion necessary to fill several rows of stair steps.
Overlap felt courses at least 4 inches.
For many years felt paper served as the leading type of shingle underlayment.
Use the chalk line to snap a straight line vertically every 6 inches.
Every 5 inches make a new mark until you get to the rop of the roof.
The ms300 and felt paper was secured using staplers and when the shingles go on the roofing nails will hold it place too.
After this lines should be snapped every 34 as you move up the roof.
Roll out the felt eliminating creases or bubbles and drive at least three staples every foot.
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Use your chalk and tape measure to mark about 12 inches up on the roof for the first set of shingles.
Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment.
Roofing felt is a layer of tar paper installed beneath the shingles to provide a backup waterproof membrane in case of leakage.
Repeat this on both sides of the roof.
If you use the lines as guides for installing shingles measure up from the drip edge to confirm that you stay parallel.
Snap a chalkline 32 inches above the top edge of the wsu or use the lines on the felt as guides.
Pro tip this type of underlayment is considered self healing meaning it will seal around the fasteners to remain waterproof.