Abutment
The junction of a roof with a structure which rises above it.

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

Anti-Ponding Board
A sarking support which bridges the top of the fascia board (or tilting batten) and the rafters. This prevents water building up behind the fascia.

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.

Barge Board
A timber or metal member fixed along the pitched edges of a gable to cover the ends of the roof members.

Batten
A small section of timber or steel which provides a means of supporting, positioning or fixing tiles, viz:

• Tile batten - a batten parallel to the eaves line and at right angles to the rafters. Sometimes called nailing strip or furring strip. Tiles are fixed to it. Refer Section 2 Materials, AS 2050-1989.

• Clipping batten - a batten fixed to the rafters directly behind the fascia. Used for fixing the bottom course of tiles when sarking is not specified.

• Counter batten - a batten fixed on top of the rafters to allow sarking to sag where ceiling lining (with exposed beams) is used.

• Tilting batten (bellcast) - a batten fixed to the eaves end of a pitched roof to maintain the roof slope at the eaves course. The fascia board is usually used for this purpose.

• Wiring batten (where applicable) - an intermediate batten for wiring of tiles.

Bedding
The fixing of tiles, ridging or hip capping upon a bed of mortar. Also the term for the mix. Note: Edges are finished off by "pointing".

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

Dormer
A vertical window formed in a sloping roof.

Eaves
The lower parts of a roof which project beyond the face of the external walls.

Eaves Overhang
The inclined distance (line of rafter) from the external load-bearing wall to the fascia.

Eaves Width
The horizontal dimension between the inside of the fascia board and the outside of the external wall.

Edge of Roof
The area of a roof bounded by the eaves, ridge and barge, extending towards the centre of the roof for a distance equal to 0.1 multiplied by the minimum plan dimension of the building, measured from eaves to eaves or barge to barge.

Fascia Board
A member, usually of timber, fixed to the rafter ends. Fixing Materials Components used to fix and weatherproof a roof, e.g. nails, screws, clips, mortar. Fixing Systems refer Section 2.4 AS 2050-1989.

Flashing
A strip of flexible waterproof material (usually ductile) used to exclude water from the junction between a roof covering and another part of the structure, viz:

• Apron flashing - a flashing with the lower edge lapped over the head of each tile.

• Cover or counter flashing - a flashing which overlaps the sides of tiles. Often overlaps other components such as soakers.

• Raked flashing - a flashing which covers an inclined intersection. The top edge is secured into a chase cut parallel to the top surface of the roof.

• Stepped flashing - a flashing used to cover an inclined intersection, secured into the horizontal joints.

Gable
The vertical face of the roof end.

Gable End Cover Tile (Barge Tile)
A tile fitting covering the gable end.

Gauge
The measured distance between tile batten centres.

Gutter
Any form of roof water channel, viz:

• Back gutter - a gutter at the back of a chimney or other penetration in a pitched roof.

• Box gutter - a gutter with parallel sides, usually between two opposing roof slopes.

• Concealed gutter (secret gutter) - a gutter formed at a valley or against an abutment and concealed by the tiles and flashing.

• Eaves gutter - a gutter fixed at the eaves.

• Valley gutter - a gutter at the internal junction of two roof slopes.

High-Wind Area
Areas in which the basic design wind velocity, modified for terrain and height in accordance with AS 1170.2, is not less that 33 m/s. Refer also Appendix A, AS2050-1989.