Owens corning deckseal sa sbs cap 39 375 ft w x 32 833 ft l 100 sq ft shasta white roll roofing.
2 layers roll roofing.
For many years it was acceptable to put even the third layer.
How to install roll roofing on low slope roofs.
Apply roofing cement and secure the second layer to the roof.
Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles.
Valleys will be open so flash them before hand with metal or two layers of roll roofing the first an 18 inch wide strip and the second 36 inches wide.
On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.
Attach drip edge along the edge of the roof with roofing cement.
There are some advantages to roofing over existing shingles says dale richards owner of richards roofing in troy michigan.
When the two layers are pressed together they form a seal.
As mentioned above place the first 6 inches 15 cm of the second layer on top of the first layer.
The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.
To install roll roofing you ll need to cut the material into long strips of the correct length for your roof and lay it flat.
Install the first strip upside down.
Nail along one edge first spacing nails inch in from the edge and 6 inches apart.
If your roof pitch declines up to 1 inch vertically for every 12 inches horizontally 1 12 pitch it is a good candidate for rolled roofing as long as you use the concealed nail method of fastening.
Check the sheathing for any nails or screws that may be.
Asphalt shingles typically can have one more layer added over the top two roofs total.
The top membrane sheet to a torch down roofing system is a smooth cap sheet.
Otherwise the safest minimum pitch for rolled roofing is 2 inches of decline per 12 inches of horizontal direction 2 12 pitch.
Extend the front edge of the drip edge so it runs off the roof and into the.
For extra durability you may install roll roofing in two layers.
It also helps if you first install a layer of roofing felt.
The first course starts with an extra 1 2 wide run.
Then nail the opposite edge.
Clean the roof with a broom to remove any debris.
Get your trowel and another scoop of cement and apply it on the roof below the second chalk line.
The strips should always be horizontal.
Assuming your roofing contractor is using standard 36 wide 15 roofing felt double coverage means that each layer of felt put down across the roof laps 19 over the upper half of the previous course.
Once the cement is spread across the roof it s time to place the second layer down.
Steep sloped roof products such as tile slate metal and shakes only allow one layer.
