Our Services Coal Tar Built-up Roofing Systems are well known for their long-term durability, low maintenance and low life-cycle cost. This system's leading features are its self healing properties, natural resistance to aging and its ability to resist ponded water. A Coal Tar roofing system represents the industry�s premier built-up roof membrane assembly. 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. Its superior resistance to ponding water eliminates the costly use of tapered insulation. Its cold flow/self-healing properties mean lower maintenance costs since small cracks and fissures disappear before they become real problems. The unprecedented and time tested performance of coal tar pitch, coupled with the redundancy of up to 5 plies of organic or fiberglass reinforcements, makes a Coal Tar built-up roofing assembly the system of choice where long term performance and low maintenance costs are important.
If these symptoms sound familiar, it's likely that you were handling coal-tar-pitch roofing. Two types of BUR. Coal tar pitch is a by-product of converting coal into coke for steel manufacturing—and, way back when, of gasifying coal to make illuminating gas—whereas asphalt is a by-product of refining petroleum. Visually they're similar, but chemically they are much different. In general, the built-up roofing (BUR) industry has been declining since the 1970s, with the advent of reliable single-ply membranes, though asphalt BUR is still installed today. New coal-tar-pitch roof installations, however, are extremely rare. Because of the different properties of asphalt and coal tar pitch, roofers were careful not to mix the two materials on the same project. Application tools—such as melting kettles, mops, and mop carts—needed to be dedicated to either pitch or asphalt. Also, each had its own specific felt membranes and mastic products: pitch paper and mastic for pitch roofs, and asphalt paper and mastic for asphalt roofs.
What is the difference between coal tar and bitumen? - Quora
Remember, you're dealing with liquid so the bucket can shift. So make sure the bucket isn't too heavy. Step 4: Apply tar carefully It's best to start in the corner of your roof. Pour the tar out and use a fiberglass mop to move it around. Focus on making smooth strokes. Cover every area of the roof and make sure that your layers are thin. Ideally, you should be rolling in a straight line and work towards the opposing corner. Make sure that the tar doesn't buildup or clump in any specific area. Carefully spread tar paper across the top of the tar and use your mop to go over it. This ensures that it sinks into your asphalt. You can seal each layer by overlapping the tar paper. Create three layers. Step 5: Be mindful of the heat It's important that you take precautions when you're dealing with hot tar. Your tar kettle should always be 25 degrees below flashpoint so that there's no chance of explosions or fires. Never place your kettle near objects that are flammable. This includes grass, wooden tools, and rags.
But the most impressive benefit of coal tar pitch as a material is that it self heals! How is that possible? It's because the material isn't technically solid; as temperatures warm, the coal tar pitch is able to flow and fill in any cracks or fissures that appear in the roof's surface. That means protection against hail, ultraviolet radiation, chemicals, oxidation, and of course, water! Is It Right for You? There are buildings where it's difficult to have tapered insulation. Ponded water can also be an issue, especially during hurricane season when the storms are fierce. If people need to walk on the roof frequently, coal tar is a great choice. Plus, in case you didn't know, the longevity of coal tar pitch is phenomenal. Over a history of more than 125 years in use, coal tar roofing systems have lasted longer than almost any other type of roofing material. And if you combine this with a protected membrane like Ultra SHIELD, the effects are even stronger! Don't hesitate to contact us if you want to know more about this excellent roofing material!
Other workers who may be exposed to coal-tar pitches include those who produce or use pavement tar, roofing tar, coal-tar paints, coal-tar enamels, other coal-tar coatings, or refractory bricks. The general population may be exposed to coal tars in environmental contaminants and through the use of coal tar preparations to treat skin disorders such as eczema, psoriasis, and dandruff. Which cancers are associated with exposure to coal tar and coal-tar pitch? Occupational exposure to coal tar or coal-tar pitch increases the risk of skin cancer. Other types of cancer, including lung, bladder, kidney, and digestive tract cancer, have also been linked to occupational exposure to coal tar and coal-tar pitch. How can exposures be reduced? Exposures to coal tar and coal-tart pitch are regulated under the U. S. Occupational Safety and Health Administration's (OSHA) Air Contaminants Standard for general industry, shipyard employment, and the construction industry. OSHA provides detailed safety and health information about coal-tar pitch to the public.
2 µg/m 3 2016 [ 22] µg/m 3 = micrograms per cubic meter Canadian agencies/organizations Agency Designation/Position Health Canada DSL – high priority substance with greatest potential for exposure 2006 [ 23] CEPA Entry for 'PAHs' only 1999 [ 24] National Classification System for Contaminated Sites Rank = "High hazard", confirmed human carcinogen 2008 [ 25] DSL = domestic substance list CEPA = Canadian Environmental Protection Act Coal tar was not included in other Canadian government guidelines, standards, or chemical listings reviewed. Main Uses The majority of coal tar is distilled to produce refined products, including creosote, coal-tar pitch, crude naphthalene, and anthracene oils. [ 1] Because of its high availability and heating value, some crude coal tar is used as fuel for blast furnaces in the steel industry. [ 5] Coal tar also has a long history of use in pharmaceutical products to treat skin conditions, including eczema, psoriasis, and dandruff. It is also used in denatured alcohol.
Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… … Wikipedia technology, history of — Introduction the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, "art, craft, " with logos, "word, speech, " meant in Greece a discourse on the arts, both… … Universalium dye — dyable, dyeable, adj. dyer, n. /duy/, n., v., dyed, dyeing. n. 1. a coloring material or matter. 2. a liquid containing coloring matter, for imparting a particular hue to cloth, paper, etc. 3. color or hue, esp. as produced by dyeing. 4. of the… … Universalium Oil sands — The Athabasca oil sands in Alberta, Canada, are a very large source of bitumen, which can be upgraded to synthetic crude oil. Bituminous sands, colloquially known as oil sands or tar sands, are a type of unconventional petroleum deposit. The… … Wikipedia steel — steellike, adj.
In 1973-1974 an oil embargo existed which brought about the introduction of a 2-ply coated asphalt felt which reduced the number of mopping layers and required less labor. Unfortunately, these 2 ply layers were plagued with blistering. Today, roofing companies in Oakville and throughout the GTA use a 4, 5 or 6 layer material which has greatly reduced the risk of blistering. Asphalt emulsions come into existence Asphalt itself is water impervious. However, introducing an emulsifying agent such as bentonite clay it can be dispersed in water. This roofing system provides a stable base for reflective roof coatings and once cured, provides excellent fire resistance without the need for a gravel surface coating. These emulsion based roof systems were so good, they were often used with a single-ply base sheet with several layers of emulsion and chopped fibreglass for reinforcement. This emulsion system was useful when resurfacing bituminous roofs and made an excellent base for reflective coatings.