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Tar and gravel roof cover is used primarily on roofs with low slopes ranging from a little better than flat to somewhere around a 3-in-12 slope - (that's roofing talk for three inches of vertical rise for every twelve inches of horizontal run). This type of roof is composed of alternating layers of roofing felt and hot tar and is often referred to as a hot mopped or built-up roof. It sounds as if you have a variation of this. That is, you have a built-up or hot mopped roof which does not contain gravel. A tar and gravel roof without the gravel so to speak.

Tar and Gravel Roofing Composition

A very popular feature of contemporary homes and commercial buildings is the low slope roof (3:12). Because many roofing materials such as shingles are unsuited to such low slopes, tar and gravel roofing is a common original material used. Also known as 'built-up roofs', tar and gravel roofing consist of layers of asphalt and tar paper that are fastened to the roof surface with molten asphalt applications. The layers are laminated and then covered with gravel to hold them down and protect against UV degradation. Some of this gravel becomes embedded in the hot asphalt, and some remains loose on the roof surface floor. The life expectancy of tar and gravel roofs is approximately 10-20 years.

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