Tar and gravel roofing is a low slope roof type.
Tar and gravel roofing.
The fumes produced are also very noxious and fatal roofing accidents have occurred in the past with exploding kettles and scorching spills.
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No more than 3 inches of rise for every 12 inches of length.
The exact lifespan of your tar and gravel roof will depend on a few factors.
Tar and gravel roofing is meant to be installed on buildings that have flat or low slope roofs i e.
Used in the united states for more than 100 years tar roofs were traditionally six ply meaning that they had six layers of roofing material.
The surface is given a flood coat of hot asphalt and pea sized gravel is evenly distributed on top.
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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.
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The installation of this roof type consists of installing onto the roof alternating layers of plies and bitumen membranes with an extra layer of aggregate material stone or gravel.
A tar and gravel roof will last on average anywhere from 20 years to 25 years.
Tar and gravel systems involve a hot kettle to melt large chunks of solid tar so there are an inherent danger and high insurance liability.
In fact a bur roof can have from three to five ply sheets of asphalt membranes.
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Built up tar and gravel roofing diagram roofing made from a single layer of asphalt impregnated material called asphalt roll roofing is similar to built up roofing.
Tar and gravel flat roof systems are installed by laying out three to four layers of asphalt saturated felt roof paper tar paper and mopping on hot asphalt.
This is used more often on garages and outbuildings than on houses because of its relatively short life span 5 to 15 years.