Generally used on flat or low-pitched roofs, a roofing system composed of three to five layers of asphalt felt laminated with coal tar, pitch or asphalt, and finished on top with crushed slag or gravel.
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Generally used on flat or low-pitched roofs, a roofing system composed of three to five layers of asphalt felt laminated with coal tar, pitch or asphalt, and finished on top with crushed slag or gravel.
« Back to Glossary Index