Follow the 10 steps below in order to felt a flat roof.
Which side of roof felt up.
Afterward roll the felt away from you lengthwise along the lower edge about 10 feet 120 in.
Osb roof panels should always be installed with the grade stamp facing into the attic and the screened surface with the nail guide lines facing up.
The roofing felt should be applied in layers that overlap.
Step by step guide for felting a flat roof.
The nails will make holes in the roofing felt which eventually become slightly oval and let the rain through.
Have a helper ready to assist with this step and take care to get the lines straight and clean.
This guide will use the more durable 30 roofing felt although you can use 15 felt.
After this lines should be snapped every 34 as you move up the roof.
Problem is the felt doesn t flatten out even when it dries so the ridges don t go away.
When the vapor hits the roofing felt the felt expands which in turn pushes up the shingles.
Heavier shingles may help to keep felt from pushing up but then again maybe they won t.
The smoother side goes downward and so any softening will help it stick to the shed roof.
Work up the roof to the peak and fold felt over the top overlapping at least 3 inches and fasten it on both sides.
As you roll it out make sure that it remains flat.
Roofing felt is comprised of a base made from natural materials such as wood cellulose or synthetic ones such as fiberglass or polyester and then coated or saturated with a protective coating such as bitumen asphalt which repels water but still allows the product to breathe.
Chalk lines should be snapped 33 5 8 above the eave line.
The screened surface also provides a little more.
When the grade stamp is covered by roofing the building inspector will not be able to confirm that the correct osb roofing panel was used.
Start rolling the first layer of felt out from the bottom of one side of the roof.
Do the other side of the roof the same way also with an overlap at the peak.
In terms of materials please note that there are several different weights for the roofing felt.
