Glossary

 

Below we explain the terms commonly used in the roofing and construction industry for those who are not familiar with it. All these terms are explained in the context relate to this industry. We hope that you find this useful.

 



Apron Flashing - a term used for a flashing located at the juncture of the top of the sloped roof and a vertical wall or steeper-sloped roof.

Asphalt - a dark brown or black substance found in a natural state or, more commonly, left as a residue after evaporating or otherwise processing crude oil or petroleum.

Attic - the cavity or open space above the ceiling and immediately under the roof deck of a steep-sloped roof.

Beams - Load bearing cross members, usually timber or steel, that support the upper structure of a building – additional floors and/or roofs.

Building - Any temporary or permanent, movable or immovable structure including a structure intended for occupation by people, animals, machinery or chattels.

Building Code - The national, mandatory standards for building work. All building work in New Zealand must comply with the Building Code.

Building consent - Consent issued by a building consent authority for building work to begin in accordance with the approved plans and specifications. For information about when a building consent is required and how to apply, see Building consents and inspections process.

Building Consent Authority (BCA) - BCAs are Territorial Authorities, Regional Authorities or private body that has been registered by the Department of Building and Housing. BCAs issue building consents, undertake inspections during construction and issue code compliance certificates, notices to fix and compliance schedules.

Barge Board - The flat board fixed at the edge of a gable roof following the slope of the roof from the eves to the ridge.

Batten - usually made of timber, long strip, size 50x40mm, fixed above rafters for fixing the new roof.

E2 - ‘E2 External moisture’ is a clause within the Building Code requiring the prevention of water that could cause undue dampness and damage to building elements.

Eaves - The part of the roof that extends out over the walls.

Fascia - any relatively broad, flat, horizontal surface, usually made of steel or timber and fixed to the rafter ends where the gutters attach.

Flashing - A building element used on a joint between two materials designed to catch and drain rainwater to prevent it penetrating the interior.

Foundations - The substructure that supports a building, such as piles, piers or footings, with the purpose of transmitting structural loads from the building into the earth.

Framing - The skeletal framework of a building to which roofs, floors and cladding are attached. Usually constructed of wood or steel, the components of the frame include studs, beams, joists and rafters.

Gable - Triangular upper part of wall at the end of a ridge roof.

Gable Roof - Also known as pitched or peaked roof. They are easily recognized by their triangular shape.

Galvanised - Steel that has been coated in 100 per cent zinc.

Hip - Sloping junction of two roofing surfaces that generally meet at an external corner.

Hip Roof – A hip roof has slopes on all four sides. The sides are all equal length and come together at the top to form a ridge.

Licensing Building Practitioners (LBPs) - A licensing system for the building industry covering designers and trades. From March 2012 certain critical building work will need to be carried out or supervised by a licensed building practitioner.

NZBC - New Zealand Building Code.

Pitch - The angle or slope of the roof surface.

Profile - Usually indicates the shape or design of a roofing product.

Product certification - Certification by a product certification body that a specific building product, system or method meets nominated provisions of the Building Code, if used in accordance with conditions on the product certificate.

Purlins – Are roof framing timbers that are fixed over the rafters and that the roof cladding is fixed to.

Resource consent - A consent issued by a Territorial Authority to use the land in a way that is not a permitted activity under a council or district plan. Resource consent will be needed when a building project will contravene a permitted activity, for example, wishing to locate a building closer to the boundary than permitted on the District Plan.

Ridge - The highest point of a pitched roof that receives the head of the rafters.

Trusses - Structural components to support roof and ceiling cladding, typically prefabricated using timber and nail plates. It also available on steel frame.

Underlay - A moisture-resistant building paper that is laid over the rafters and under the battens. Required under New Zealand building code 3604 for lightweight roofing as a condensation barrier.

Valley - the area which is formed at the intersection of the lower end of two roof slopes. A valley tray is installed in this area to direct water to the gutter.

Waterproof - The process of rendering a building element or building totally resistant to the ingress of any moisture.

Weathertightness - The resistance of a building to the weather. Weathertightness is not necessarily waterproofing (see above). A building is weathertight when water is prevented from entering and accumulating behind the cladding in amounts that can cause undue dampness or damage to the building elements, ie. moisture may occasionally enter a weathertight building but is able to harmlessly escape or evaporate.