Wayne's Roofing: Photo Glossary

	This glossary contains many useful terms and definitions. For easier browsing you can view our Photo Glossary, which has photographs of common roofing sites and problems, or you can browse the entire glossary by our alphabetical listing. A \| B \| C \| D \| E \| F \| G \| H \| I \| J-L \| M \| N \| O-P \| R \| S \| T \| U-V \| W-Z

Photo Glossary

This Photo Glossary contains a sample of some common roof sites and problems to better help you find the answer to your questions or observations. Each thumbnail has a link to a more detailed "Photo Example", and a link to it's glossary definition and from there you can browse Wayne's Roofing's extensive roofing glossary.

	Aggregate Roof System: rock, stone, crushed stone, crushed slag, water worn gravel or marble chips used for surfacing and/or ballasting a roof system.
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	Alligatoring: the cracking of the surfacing bitumen on a built-up roof, producing a pattern of cracks similar to an alligator’s hide; the cracks may or may not extend through the surfacing bitumen.
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	Blister: an enclosed pocket of air, which may be mixed with water or solvent vapor, trapped between impermeable layers of felt or membrane, or between the membrane and substrate.
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	Drain Sump: an intentional depression around a roof drain or scupper that serves to promote drainage.
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	Flaking: detachment of a uniform layer of a coating or surface material, usually related to internal movement, lack of adhesion, or passage of moisture.
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	Mole Run: a meandering buckle or ridging in a roof membrane not associated with insulation or deck joints.
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	Ridging: an upward, elongated tenting displacement of a roof membrane frequently occurring over insulation or deck joints. Ridging may be an indication of movement within the roof assembly.
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	Splitting: a rupture (generally linear) or tear in a material or membrane resulting from tensile forces.
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