As the roofing industry has a large variety of terms, we have put together some common roofing definitions below to help you further understand our products and services.
Alternatively you can quickly access the following information sheets:
Roofing and Walling Profiles
Astragal: See straps.
BMT: Base metal thickness
Box Gutter: A gutter not at an eave, typically at the base of two opposing roof slopes.
Chimney Gutter: See Soaker
CGI Corrugated: See Roofing Profiles
CGI Mini: See Walling Profiles
Cladding: Sheeting that encloses a building-roofing and walling.
Close Pitched Trapezoidal: See Roofing Profiles
Colours: View COLORBOND® Steel colour samples
Conceal-Fixed Roofing: See Roofing Profiles
Concealed-fastened: A method of fixing cladding by means of hidden, fixing clips or brackets (sometimes called secret fixing).
Corodek®: See Roofing Profiles
Corrugated Roofing: See Roofing Profiles
Custom Orb®: See Roofing Profiles
Downpipe: A pipe to carry roof water from gutters and roof catchments to drains or storage tanks.
Drop: A short fitting in a gutter sole, where rainwater leaves the gutter to accommodate a downpipe.
Dry Verge: Usually associated with tiles to provide a simple clean finish. Alternatively used on a raking barge.
Dutch Gable: is a roof with a small gable, usually at the top of a hip roof.
Elbow: A fitting used in a downpipe, to change direction of the downpipe by about 90 degrees.
Electrolytic (galvanic) Corrosion: Corrosion resulting from the contact of two different metals when an electrolyte (like water) is present.
Expansion Joint: A joint in a long run of cladding, gutter or flashing designed to allow for thermal expansion and contraction.
Fascia (fascia board): A board, or rolled metal product of similar dimensions, fixed along the eaves, to which a gutter is secured.
First Flush Divertor: A device fitted to a downpipe preventing sediment and debris from entering a rainwater tank.
Fixings Screws: nails or clouts used to fasten cladding to a building structure.
Flashing: A material, usually metal, used to waterproof the junction between two intersecting roof and/or wall surfaces. At a masonry wall, it is often built into the mortar.
Gable Roof: A sloping roof running over either side of the generally triangular portion of a wall known as a Gable.
Galvanized Steel: Steel sheeting protected against corrosion by a zinc coating applied by the continuous hot-dip process.
Girth: The width of the blank strip from which a profile is rolled (usually refers to gutters and flashings).
Gutter: A channel that collects roof water and carries it to an outlet.
Gutter Profiles: This link will take you to our Gutter Profiles Page
Hi-Ten: See Roofing Profiles
Hip Roof: is a type of roof where all sides slope downwards to the walls, usually with a fairly gentle slope.
Klip-Lok 700® Hi-Strength: See Roofing Profiles
Longspan®: See Roofing Profiles
Maxirib®: See Walling Profiles
Metlok 700®: See Roofing Profiles
Metrospan®: See Roofing Profiles
Mini Orb®: See Walling Profiles
Mini Corodek®: See Walling Profiles
Mini Corry®: See Walling Profiles
Monoclad®: See Roofing Profiles
Oilcanning: Variation from flatness of sheet metal, creating undulations along the surface. The result is poor appearance and potential ponding.
Parapet: A wall on the perimeter of a building that projects above the line of the eaves.
Penetration: A projection through the roof, e.g. vent pipe, chimney or rooflight.
Pierce-fastened: A method of fixing cladding by means of a screw or nail which pierces the cladding.
Pitch: see Fall.
Ponding: Pooling of undrained water on a roof.
Pop: See Drop
Prospan: See Roofing Profiles
R-value: A value given for the resistance to heat transfer of a roof or wall system.
Rib: A longitudinal upstand in cladding.
Ridge Capping: Formed metal designed to weatherproof the junction at the apex of opposing roof slopes.
Roofing Profiles: This link will take you to our Roofing Profiles Page
Sarking: A membrane to collect and discharge clear of the structure any water that may penetrate a roof or wall cladding.
Shoe: A fitting used in a downpipe, to change direction of the downpipe by about 45 degrees.
Skillion Roof: normally a single sloping roof surface, not attached to another roof surface.
Smartspan®: See Roofing Profiles
Soaker (gutter): A small gutter located on the upper side of a chimneystack.
Soaker (flashings): Formed metal designed to weatherproof the perimeter of roof protrusions or penetrations. Soaker flashings are usually positioned under rather than over the surrounding metal roof.
Sole: The internal, bottom surface of a roof gutter.
Spandek®: See Roofing Profiles
Speed Deck Ultra®: See Roofing Profiles
Spigot: See Pop.
Spreader: A downpipe-tee or elbow fixed at 90 degrees to the roof slope used to spread stormwater over a greater area of the roof.
Spouting: See Gutter.
Straps: A metal band used to secure a downpipe to a wall.
Sump: A roof gutter pit used to connect downpipes to internal roof gutters.
Superdek®: See Roofing Profiles
Topdek® 700: See Roofing Profiles
Trapezoidal Roofing: See Roofing Profiles
Trays: See Pan.
Trimclad®: See Roofing Profiles
Trimdek®: See Roofing Profiles
Valley Boards: Timber or profiled metal laid under a valley gutter to support it.
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