Coal Tar Pitch Roofing Details

Both coal tar and coal tar pitch contain many chemical compounds including carcinogens such as benzene.

Coal tar pitch roofing details.

Coal tar pitch membranes using coal tar saturated organic felts is one of the oldest systems listed in table 2 these systems perform very well historically but are limited to very low slope applications and must be gravel surfaced because of the low viscosity of coal tar pitch at normal. Coal tar s unique molecular structure provides a system that resists water and vapor penetration insect damage chemical attack uv exposure and most elements considered common enemies to other roof membrane systems. Astm d450 standard specification for coal tar pitch used in roofing dampproofing and waterproofing provides a classification for two types of coal tar bitumen. Coal tar pitch is produced by distilling or heat treating coal tar which is a by product of the production of coke or coal gas.

Bituminous roofing hits the market back in the pre world war ii years there were two bituminous substances bitumens that dominated the roofing industry. Science and technology 2001. Coal tar is a thick dark liquid which is a by product of the production of coke and coal gas from coal. Coal tar pitch is a thick black liquid that remains after the distillation of coal tar.

Cash in encyclopedia of materials. Type i coal tar pitch is intended for use in built up roof membrane construction. A coal tar roofing system represents the industry s premier built up roof membrane assembly. Type ii coal tar pitch is intended for below grade waterproofing applications.

Coal tar pitch roofing in the processing of coal to make coke for steel making volatile compounds are collected from the coking ovens condensed and separated and become the base of hundreds of raw materials including dyes plastics and a byproduct called coal tar pitch. It is used as a base for coatings and paint in roofing and paving and as a binder in asphalt products. It has both medical and industrial uses. Coal tar is considered the product of choice for roofs which have ponding water due to its superior ability to withstand extended exposure to water.

Medicinally it is a topical medication applied to skin to treat psoriasis and seborrheic dermatitis dandruff. Historically coal tar pitch was used as a component on the first sealed roads has served as a heating element and was used to manufacture paints synthetic dyes and. The traditional coal tar built up roof is one of the most reliable and longest lasting low slope commercial flat roofing systems available. 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.

Industrially it is a railway tie preservative and used in the surfacing of roads. Coal tar pitch is melted on site in an industrial kettle and applied to the roof as a hot liquid. 2 9 coal tar pitch built up roofing.