Glossary Of Roofing Terms
ROOFING TERM DESCRIPTION
Abutment: A junction of a roof surface with a wall, or any other structural feature, which arises above it
Barge Board: A Timber/Upvc board fixed along the edge of a gable.
Batten: Horizontal small section timbers that are nailed to the rafters and to which tiles/slates are fixed/secured.
Back Gutter: A gutter formed in lead at the back of a chimney, or any other structure, which penetrates the roof to disperse water onto tiles/slates.
Cold Roof: A roof that has insulation laid horizontally at ceiling level and a void between the insulation and its outer roof structure and covering.
Course: A horizontal row of tiles/slates.
Dormer: Framed window unit, which projects through the sloping plane of a roof.
DownPipe: Drainage Pipe which takes water away from guttering to drains.
Eaves: The horizontal, lower edge of a sloped roof – where the first course of tiles/slates are laid/fixed on the fascia board.
Fascia Board: The horizontal timber/Upvc trim attached vertically at the eaves that covers the rafter ends, the wall plate or the wall face – the guttering is fixed to this and upon which the first course of tiles/slates are laid
Felt/Underlay: Breathable membrane, untearable bituminous or PVC sheet material, supplied in rolls and laid over rafters
Flashing: Strip/s of lead, used at abutments, to stop water penetration, The ‘Code’ of lead means the thickness.
Gable: The upper portion of a sidewall, which comes to a triangular point at the ridge of a sloping roof.
Gauge: The length of tile/slate exposed after it has been installed. It equals the distance between the top of one batten/slate/tile and the top of the next.
Gutter: The trough that channels water from the eaves to the down pipes.
Headlap: The amount by which a tile/slate overlaps the course below it.
Hip: The meeting of two pitched roof surfaces, which meet at an external angle.
Hip Iron: A metal hook, which is secured to the roof structure to support the hip tiles and stop them from moving or slipping
Mortar: Sand and cement mix consisting of 3/4/5 parts sand to 1 part cement.
Parapet: Low protective wall that extends above the roofline for support.
Pitch: Also known as ‘slope’, is the measure of how steep a roof is. The pitch of a roof is a big factor in determining the kinds of materials that can be used and the longevity of the roof. Usually, a steeper roof will last longer due to its better draining capabilities.
Purling: Main structural roof support timber: usually situated half way up the roof span: to which rafters are nailed.
Rafter: The supporting framing timber, sloping from ridge to wall plate.
Raking Cut: A diagonal cut across courses of tiles/slates.
Ridge: The uppermost horizontal junction of two slopes forming the apex of a pitched roof.
Saddle: A piece of impervious flexible sheet material (usually lead) dressed to shape, fitted to provide weather protection.
Secret Gutter: A gutter formed at an abutment and effectively hidden from sight.
Soaker: A small piece of sheet (usually lead), shaped and inserted between the roof covering and the sub-
Undercloak: Title or fibre cement strip, fixed at the verge beneath the battens, onto which the verge tiles/slates are bedded.
Underlay: A layer of material acting as a barrier between the roof covering and the sub-
Valley Gutter: A visible gutter running down the valley.
Verge: A free end of a roof surface; for example that at the end of a gable or dormer.
Warm Roof: A roof that has insulation and a vapour barrier laid above or between its supporting structure (normally on the pitch of the rafters) and immediately below its waterproof membrane.
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BPC Roofing Services, BPC Roofing Services
Unit One, Radfordmill Farm, 32 Redhouse Court,
Timsbury, Somerset, Bathgate, West Lothian,
BA2 0QF. EH47 7BU.
07922 635920(England) 07783 870676(Scotland)
Proprieter: Mark Brown
Contracts Manager : Peter Stoney
Affiliated Firestone Roofing Epdm Installers
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