Residential low slope roofing can generally be divided up into two broad categories.
Diy low slope roofing.
You can t use the rolled roofing materials if the roof slope is more than 25.
An underlayment of felt roofing is optional.
Then apply standard asphalt shingles over the membrane.
Cut the base sheet where it extends out so it will lay down to make the transition.
2 layers for low slope roofs 15 25.
Low slope roofs sometimes referred to as flat range from 0 inches per foot up to 4 inches in a foot of run.
Let the base sheet come out 6 inches.
4 layers if the roof is flat and the slope is 0 5.
It has just one layer so it goes on fast and can be installed by a homeowner with basic diy experience and tools.
1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.
Low slope roof systems must provide the following.
Detail the area with mastic and membrane.
If possible install roll roofing over a smooth plywood deck either perpendicular or parallel to the slope.
Remove and install the low slope roofing material.
Larger flat roofed applications low slope such as residential condominium complexes row homes and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically from steep slope to low slope on the same structure.
This means that low slope roofs don t require mechanical drainage solutions like asphalt shingles or slate.
The roofing should overhang the eaves by inch except where you install drip edge flashing on top of the roofing along the rake edge.
Technology of laying the roll roofing on a flat roof.
Attain high marks for low slope roof installation posted november 30 2017 low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs.
3 layers if the roof slope is 5 15.
Install ridge shingles butting them close to the low slope roof transition.
Roll roofing is different.
Low slope metal roofs require less material which reduces the overall load on the building s structure.
Only has to be 10 or so out from where it connects to the low slope roof.
Install the low slope edge metal.