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BUILT UP ROOFING SYSTEMS

COMPARISON CHART

 Roof Type >>>

Built up Roofing (Asphalt) Built up Roofing (Coal tar)

 Traffic Resistance

 Good

Good 

Thickness 

 Excellent (Multi-ply)

 Excellent (Multi-ply)

Flexibility 

 Fair

 Fair

Chemical Resistance 

 Good

 Excellent

Life Cycle 

 Good

 Very Good

Track Record 

 Good 20 years Very Good 25 years 

A built up roof system is made up of three materials (bitumen, felts and surfacing). There are two kinds of bitumen, asphalt and cold tar.

Asphalt built up roofing system is a roof constructed with ply felts made with asphalt-impregnated fiberglass and mopping asphalt. The surface is a flood coat made up of asphalt and aggregate (gravel, crushed stone, slag, or marble chips). Generally, these roofs consist of four plies of felt installed in shingle fashion. Asphalt is not a true waterproofer and depends on positive slope in order to maintain its integrity.

Coal tar (pitch) built up roof is a roof constructed with plies (layers of felt) made with coal tar impregnated fiberglass and mopping asphalt. The surface of a coal tar pitch built up roof is always a flood coat of coal tar and aggregate, such as gravel or crushed stones.

When the layers of a built up roof are installed correctly, it creates a strong, water tight membrane.

“It is essential that a built up roofing system is installed by true commercial roofing professionals”


The bitumen used to apply on these systems must be heated to the ideal temperature. If the bitumen is too hot, the quality of the bitumen will be diminished. If the bitumen is not hot enough it will not flow as well when it is applied. If it does not flow well, it will not adhere as it should. If that happens, the roof system will not last long.

Whitco Roofing has successfully installed hundreds of built up roofing systems, and can provide solutions, to meet both your budget and needs. Need advice? Need an estimate? Need answers? Contact a roofing professional at Whitco today!


Built up roofing repairRepair - Total Tear Off and Replacements - Installation - Restoration - Management - Maintenance - Solutions

Service areas AL - FL - GA - TNProviding professional roofing services to Atlanta, Georgia and beyond. Service areas include all of AL, FL, GA, LA, MS, NC, SC, TN, and VA.