A-B | C-E | F-N | P-Z

Abutment

Where the roof tiles meet a structure rising above the roof.

Accessory

A concrete or terracotta product used to finish the roof; includes apex, ridge and barge tiles.

Anti-ponding board

A sarking or underlay-support of various materials, (galvanised iron, fibrous cement etc), installed along the eaves lines from the top of the fascia back to the rafter with a clearance of 10 mm below the first batten. This prevents water "ponding" behind the fascia. Anti-ponding boards should be installed on all low pitched roofs or roofs with no overhang.

Apex

The intersection of all ascending hips where they meet either a ridge or another ascending hip. Note: Also the name of a three or four-way fitting used to cover this point.

Apron flashing

A one-piece flashing, such as is used at the lower side of a chimney that penetrates a sloping roof.

Barge board/verge board/gable board

A sloping board installed to the pitched edges of a gable, covering the ends of roof timbers.

Barge course/Verge course

The tiles next to the gable.

Bastard valley or hip

A valley or hip formed in an abnormal or non-parallel line on which tiles are fixed.

Battens

A specifically sized timber or steel section installed parallel to the eave line on which tiles are fixed.

Bedding

A composition of brick layers’ sand and cement for fixing ridge capping on hips and ridges. The edges are finished off with a pointing material.

Bellcast batten (Tilting batten)

A batten installed on the toe of the rafters in a vertical line with the plum cut, to keep the eaves course of tiles on the same rake as the other courses. (The fascia board usually serves this purpose).

Bond

The system of aligning tiles on the roof in relationship to each other. With a straight bond, the sides of tiles form straight lines from bottom to top course. With a staggered, broken or cross bond, tiles in each alternate course overlap, by half, the tiles above and below them.

Box gutter

An internal roof gutter between the slopes of a roof or a roof and a wall that discharges water internally through a sump.

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