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Glossary

Glossary of roofing terms

Anticon Blanket

Installed over the roof frame directly beneath metal roof sheeting, it consists of a glasswool blanket adhered to an impermeable reinforced reflective foil facing.

Apron

Metal flashing used where roof meets vertical faces such as walls, chimneys etc.

Barge cap

A flashing that is used to fix the gable end of the roof where the sheets start and finish.

Batten

A long strip of squared timber or rolled metal that roof sheets are screwed into.

Box Gutter

A gutter that’s not at an eave. Typically at the base of two opposing roof faces or inside a parapet wall.

BMT

Base metal thickness.

Ceiling batts

Typically made from glasswool, polyester, or wool they are a type of bulk insulation that is designed to fit directly above the home’s ceiling between joists, rafters or studs.

Colorbond

Colorbond is the brand name of a coated steel product manufactured by Bluescope Steel. Colorbond steel is produced with a Zincalume base to provide corrosion resistance and then covered with a chemically applied conversion layer to enhance coating adhesion. On top of this goes a baked on epoxy primer and finally a baked on exterior grade top-coat

Downpipe

A pipe that carries rainwater from the roofs guttering to a drain or to ground level

Eaves
The external ceiling between the fascia and the building’s outside wall.

Edge protection

A temporary safety rail system attached to the perimeter of the building to prevent falls from roofs of certain heights

Face
A portion of the roofing area defined by having four separate edges. A single side of a gable or hipped roof

Fascia

A timber board or rolled metal product of similar dimensions, fixed along the eaves to which gutter is secured

Flashing
Materials used to waterproof a roof around any projections

Gable
Traditional roof style; two peaked roof planes meeting at a ridge line of equal size.

Guttering

A shallow trough fixed under the edge of the roof made to assist in carrying off water

Hip Roof
A roof with four roof planes coming together at a peak and four separate hip legs.

Laps
The area where rolled roofing or insulation overlap one another during installation

Parapet

A wall on the perimeter of building that projects above the line of the eaves

Pitch

The slope of the roof or gutter often expressed in degrees

Ponding

Pooling of undrained water on a roof

R Value

A value given for the resistance to heat transfer of a roof or wall system

Ridge

The horizontal angle on the outer part where two sloped roofs meet

Sarking

A layer of flexible foil insulation typically installed under roof tiles when the roof is being installed

Skillion

A single sloped roof, generally not attached to another roof.

Sump

A roof gutter pit used to connect downpipes to internal roof gutters

Swarf

Fine filings or chips of metal that come off metal when cutting or drilling

Transitions
When a roof plane ties into another roof plane that has a different pitch or slope.

Valley
Area where two adjoining sloped roof planes intersect on a roof creating a “V” shaped depression.

Window Hood

A decorative awning that covers the top of a window to protect from the weather 

Zincalume

The brand name given to a coated steel product manufactured by Bluescope Steel. The steel is coated in Zinc/Aluminium alloy to increase its resistance to corrosion

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