Modified bitumen is approved for flat roofs with minimal slope but roll roofing is not viable below a 2 12 pitch two inches of rise for each twelve inches of horizontal run with exposed nails or a maybe little lower with concealed nail installation.
Roll roof difference.
The rolls are typically up to 100 feet long and may be any width from 6 20 feet wide.
It can be found in almost any home improvement outlet hardware store or online source.
Though roll roofing is similar to asphalt shingles it is considerably cheaper thinner and less durable.
Most types of roofing available for flat roofs come in rolls.
Rolled roofing may expand or contract due to temperature changes and the effect can be more significant the longer the roll is.
Rolled roofing does not last long usually about 5 8 years at most.
These rolls are also manufactured with thinner layers of base materials and asphalt.
This product is the best way of covering low incline roofs.
The vast majority of rolled roofing contains some variation of rubber in one of many different combinations.
Roof shingles can last for a very long time.
Pros of rolled roofing rolled roofing is the least expensive roofing material even compared to low cost composite shingles.
Rolled roofing msr is a mineral surfaced oil based asphalt product that is available in 100 square feet rolls and weighs about 75 pounds per roll.
Your choices for rolled roofing include materials like.
As shingles need to be cut into small shapes and feature thicker layers they tend to cost more per square foot compared to rolled roofing.
Roll roofing and modified bitumen are both suitable for low slope roofs.
The average lifespan is 20 years.