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Abstract
Bentonite clay stabilized with bituminous emulsions are widely used for roofing, the writer's own company alone marketing in more than 100 countries from 16 plants distributed around the world. The advantages they give, i.e. cold application, exceptional weather resistance and non flow even at high temperature encourage their wide use even though used on roofs in widely different climates. These materials lend themselves to production in differing grades to fulfil varying requirements, while specifying retains great flexibility, incorporating either brush, trowel or spray application. Roofing techniques used in the world are fast becoming standardized, due to the rapid interchange of information and the marketing internationally of many roofing materials especially insulants. This has enabled better comparisons to be made of the effect of climate on the material. The results tend to reveal that varying climates cause less variation in results than previously thought to be the case, and that other factors are equally or more important. The following basic roofing rules are referred to: roofs must be kept cool; waterproofings over insulants have a harder life than other materials; coatings must be protected from UV light; insulation must be kept dry; insulation cavity must be vented; specifications must allow for roof movement; insulated roofs must not be used as site working areas. Examples are given of suitable roofs for the tropics, temperate climates and for cold climates. Generally in most countries minimum roof specifications are used so that more money is available elsewhere; that is a shortsighted policy and reflects a failure of the roofing industry to have better standards accepted.
Bentonite clay stabilized with bituminous emulsions are widely used for roofing, the writer's own company alone marketing in more than 100 countries from 16 plants distributed around the world. The advantages they give, i.e. cold application, exceptional weather resistance and non flow even at high temperature encourage their wide use even though used on roofs in widely different climates. These materials lend themselves to production in differing grades to fulfil varying requirements, while specifying retains great flexibility, incorporating either brush, trowel or spray application. Roofing techniques used in the world are fast becoming standardized, due to the rapid interchange of information and the marketing internationally of many roofing materials especially insulants. This has enabled better comparisons to be made of the effect of climate on the material. The results tend to reveal that varying climates cause less variation in results than previously thought to be the case, and that other factors are equally or more important. The following basic roofing rules are referred to: roofs must be kept cool; waterproofings over insulants have a harder life than other materials; coatings must be protected from UV light; insulation must be kept dry; insulation cavity must be vented; specifications must allow for roof movement; insulated roofs must not be used as site working areas. Examples are given of suitable roofs for the tropics, temperate climates and for cold climates. Generally in most countries minimum roof specifications are used so that more money is available elsewhere; that is a shortsighted policy and reflects a failure of the roofing industry to have better standards accepted.
Date
9/1974
9/1974
Author(s)
Owen, A
Owen, A
Page(s)
Paper 19
Paper 19
Source
Society of Chemical Industry
Society of Chemical Industry
Keyword(s)
betonite clay; bituminous emulsion; weather resistance; cold applied; waterproofing
betonite clay; bituminous emulsion; weather resistance; cold applied; waterproofing