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.
Tar and gravel roofing.
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.
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The exact lifespan of your tar and gravel roof will depend on a few factors.
Some of the gravel is permanently embedded into the hot asphalt and some gravel remains.
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In fact a bur roof can have from three to five ply sheets of asphalt membranes.
If you re looking for 2020 breakdown for cost of tar and gravel roof materials and what installation cost might be you ve come to the right place.
A tar and gravel roof will last on average anywhere from 20 years to 25 years.
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The surface is given a flood coat of hot asphalt and pea sized gravel is evenly distributed on top.
The fumes produced are also very noxious and fatal roofing accidents have occurred in the past with exploding kettles and scorching spills.
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.
Tar and gravel roofing is a low slope roof type.
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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.
Tar and gravel roofing is meant to be installed on buildings that have flat or low slope roofs i e.
That is a fairly standard lifespan for a roof asphalt roofs for example last around 20 years.
No more than 3 inches of rise for every 12 inches of length.