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
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
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.