H | Roofing Glossary

Roofing Glossary, a collection of terms used in the roofing industry

There are 639 entries in this glossary.

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Term	Definition
Hand-Sealing	The method to assure sealing of shingles on very steep slopes, in high wind areas, and when installing in cold weather.
Hand-Tabbing	Applying spots of adhesive to shingle tabs.
Hatch	A unit used to provide access to a roof from the interior of a building.
Headlap	The distance that the topmost ply of roofing felt overlaps the undermost ply or course.
Heat Transfer	Thermal energy going from an area of higher temperature to an area of lower temperature by conduction, convection, or radiation.
Heat Welding	Fusing the seams of separate sections of roofing material together through the use of hot air or an open flame and pressure. Also known as heat seaming.
Hem	The edge created by folding metal back on itself. Metal is hemmed for safety and strength reasons.
High Nailing	When shingles are nailed or fastened above the manufacture’s specified nail location. (This is used in very steep applications.)
Hip	The angle formed by the intersection of two sloping roof planes.
Hip Roof	A roof that rises by inclined planes on all sides of a building. The line where two adjacent sloping sides of a roof meet is called the Hip.
Hoist	A mechanical lifting device. A hoist can be hand or electrically operated.
Holiday	An area where a liquid-applied material is missing
Honeycomb	Small voids left in concrete because the mortar failed to fill the spaces around the aggregate.
HVAC	Acronym for Heating, Ventilating, and Air Conditioning.
Hypalon	The trademark name for Chlorosulfonated Polyethylene (CSPE), which is a single-ply roofing material. It was a product of DuPont Performance Elastomers, a subsidiary of DuPont. Along with PVC, CSM is one of the most common materials used to make inflatable boats and folding kayaks. It is also used in roofing materials.