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Glossary of Roofing Terms: H
Half Gable Roof: See Shed Roof.
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 Seaming: See Heat Welding.
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.
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.
Hot: Slang for hot bitumen.
Humidity: The amount of water vapor in the air.
HVAC: Acronym for Heating, Ventilating, and Air Conditioning.
Hypalon: The trademark name for Chlorosulfonated Polyethylene (CSPE), which is a single-ply roofing material.
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