Contractors lack of knowledge and lack of training.
Residential rubber roof.
A rubber roof known in the roofing business as an epdm ethylene propylene diene terpolymer roof has a lot of advantages and only a few disadvantages one of the big advantages to rubber is the cost although a homeowner must use a licensed installer to lay down this roof the cost of the entire job still favorably compares to the cost for other types of roofing.
Most residential rubber roofs are made of single ply epdm synthetic rubber ethylene propylene diene monomer.
Look even commercial roofs are not immune to hack roofers and faulty materials like rubber roofing but in residential this is much more common.
On two sides the roof abuts a parapet a short wall common around flat roofs as well as a wall for the third floor.
Rubber roofing is likely to cost about 300 or 400 per square while asphalt shingles are usually less than 100 per square.
The national roofing contractors association provides an overview.
Here the rubber roof will need to run up the walls and glue to the sheathing.
Of all these membrane types epdm synthetic rubber is the most common single ply membrane roof material in both residential and commercial use.
So all you need to be able to say to your roof contractor is you want an epdm rubber roof.
Rubber roof membranes are often used on flat or low slope buildings including mobile homes or on unusually shaped roofs such as on a dome.