Coal Tar built-up roofing provides one of the most durable roofing
systems known due to its inherent waterproofing and weathering
characteristics. Coal tar roofing systems are the time-proven
roofing systems for level and low sloped roofs.
Coal Tar Pitch can be used for the following:
- "Dead" level roofs.
- Water-cooled roofs.
- Low sloped roofs with occasional ponding.
- Low sloped roofs with retarded drainage.
- Buildings with level or low-sloped roofs that are built for
long service life.
- Inverted Roof Membrane Assembly (IRMA).
- Waterproofing.
Koppers Coal Tar Pitch, the traditional roofing grade coal tar,
is manufactured to meet Standard ASTM D 450 Type I.
Koppers Coal Tar built-up roofing systems consist
of alternate layers of Koppers Coal Tar Roofing Pitch and Koppers
Reinforcing Felts, topped with a pouring of Koppers Coal Tar into
which is embedded an aggregate surfacing.
Slope is the most significant limitation of coal
tar roofing systems when compared to asphalt BUR's. When using
organic coal tar saturated felts (Tarred Felt), the maximum slope
allowed is 1/2" per foot. When using coal tar coated glass
felts (Tar Glas), the maximum slope allowed is 1/4" per foot.
Coal tar has a relatively low softening point,
so it must always include a gravel surface. Gravel provides many
benefits, including protecting the roof from the sun's rays, protection
from foot traffic, weight as additional protection for wind uplift,
reduced surface temperature, and protection from burning brands.
But most importantly, gravel allows us to include an additional
minimum average of 70 lb/square of coal tar in the installation
of the roof.
Coal tar provides superior performance in several areas, giving
owners a coal tar roofing system with durability levels that
are unique in the roofing industry. Coal Tar has natural resistance
to water, air, and water vapor penetration making it impervious
to standing water.
Coal Tar roofing is self-healing. Because coal
tar has a lower softening point, which allows it to actually flow
on warm days. Coal tar can actually heal itself of minor cracks
and punctures. This cold flow property is also why coal tar cannot
be used on slopes above 1/2" for organic felts, and 1/4" for
tar coated glass felts.
For more information about this product or for assistance specifying
Koppers materials for your roofing installation contact our sales
department at 1-800-558-2706 (fax us at 412-227-2262)
To reach our Warranty and Technical Department,
call 1-800-468-9629 or Fax us at 412-227-2002.
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