Readers ask: What Is Pitch Roofing Material?

Coal tar pitch roofing is a type of built-up roofing in which coal tar pitch forms the waterproofing component of the roof membrane. It was so common and used on so many flat roofs for such a long time that even today, when most built-up roofs are asphalt-based and use no “tar”, they are still called “tar and gravel”.

What is roof pitch made of?

Roof pitch is comprised of two numbers in the form of a ratio. You’ll see it expressed either with a slash – 5/12 or 8/12 – or with a colon – 5:12 or 8:12. Either way, the numerator and denominator work together to tell you the pitch of the roof. The numerator refers to the height of the roof.

What is pitch used for on a roof?

Roof pitch (or slope) tells you how many inches the roof rises for every 12 inches in depth. An Example of a roof pitch would be a “6/12 pitch” which means that the roof rises 6 ” for every 12″ inward towards the peak (or ridge).

How long does a coal tar pitch roof last?

Coal-tar roofs are reported to average 25 years of life, and some have been known to last more than 50 years with proper maintenance and surface restoration.

Is coal tar pitch a bitumen?

Bituminous Roofing Hits the Market Back in the pre-World War II years, there were two bituminous substances (bitumens) that dominated the roofing industry. Coal tar pitch was a by-product of processing coal to make coke, which in turn was used in making carbon steel and electrodes for the aluminum industry.

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What are standard roof pitches?

The most commonly used roof pitches fall in a range between 4/12 and 9/12. Pitches lower than 4/12 have a slight angle, and they are defined as low-slope roofs. Pitches of less than 2/12 are considered flat roofs, even though they may be very slightly angled.

What are the types of roof pitches?

The most common r00f pitch on residential homes falls between 4/12 and 9/12. A “walkable-roof” is generally defined as having a roof pitch of 7/12 or below. There are many different types of pitched roofs including gable roofs, hip roofs, gambrel roofs, dome roofs, and mansard roofs.

Which roof pitch is best?

For metal panel roof systems, NRCA recommends slopes of 1/2:12 or more for structural panel systems and 3:12 or more for architectural panel systems. For asphalt shingle, clay and concrete tile, metal shingle, slate and wood shake and shingle roof systems, NRCA recommends slopes of 4:12 or more.

What is a 3/12 roof pitch?

A 3/12 roof pitch angle is about 14°, so on and so forth. 4/12 is quite typical. Anything under 3/12 is a low pitch roof. Anything above 6/12 is a steep roof pitch since it becomes harder to walk on the roof.

What is a pitch tar roof?

Coal tar pitch roofing is a type of built-up roofing in which coal tar pitch forms the waterproofing component of the roof membrane. It was so common and used on so many flat roofs for such a long time that even today, when most built-up roofs are asphalt-based and use no “tar”, they are still called “tar and gravel”.

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What is coal tar pitch used for?

Coal-tar pitch is a thick black liquid that remains after the distillation of coal tar. It is used as a base for coatings and paint, in roofing and paving, and as a binder in asphalt products. Both coal tar and coal-tar pitch contain many chemical compounds, including carcinogens such as benzene.

What is asphalt and pitch?

Pitch Pitch is the name of a large number of highly viscous liquids which appear solid. Asphalt Asphalt is a sticky, black and highly viscous liquid or semi solid that is present in crude petroleum and in some natural deposits sometimes termed asphaltum.

Is coal tar waterproof?

A waterproofing material used since the beginning of time, coal tar pitch is a superior and sustainable raw material that is ideal for use within a roofing membrane system.

Is pitch a carcinogen?

There is sufficient evidence in humans for the carcinogenicity of coal-tar pitch as encountered in paving and roofing. Coal-tar pitch as encountered in paving and roofing causes cancer of the lung. Coal-tar pitch is carcinogenic to humans (Group 1).