No more than 3 inches of rise for every 12 inches of length.
Tar and gravel roof construction.
You can expect to pay 2 50 to 4 00 per sq.
This surface layer weighs down the built up roof protects it from sun exposure and serves as decoration.
Most houses with flat or nearly flat roofs are topped with built up roofing or tar and gravel roofing made from fiberglass based asphalt sheeting that is applied in layers with hot bitumen tar mopped on between each layer.
Tar gravel roof costs.
Foot or 250 to 400 per square installed on a standard sized single story home.
The average roofing installation price for a tar gravel built up roof costs anywhere between 3 750 to 6 750 depending on the slope pitch and size of your roof.
Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system.