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


A Tractile product used to finish the roof; includes visual accessories such as apex, ridge and barge tiles, as well as functional accessories such as vents, skylights and solar panels.

Anti-ponding board

A sarking or underlay-support of various materials, (galvanized 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.


The intersection of all ascending hips where they meet either a ridge or another ascending hip. It is 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.


A specifically sized timber or steel section installed parallel to the eave line on which tiles are fixed. Because Tractile roofs are light and the tiles can be made larger, roofers need fewer battens to install the roof which saves you money in materials and installation time.


Also : Mortar

A composition of brick layers’ sand and cement for fixing ridge capping on hips and ridges in traditional roofs. The edges are finished off with a pointing material. Of course, Tractile roofs connect using the Tractile Interlocking Building System and there is no need for such extensive use of bedding. In most cases, you won’t need any at all. We’re telling you this so you know one of the things you do not have to spend so much money on when you get a Tractile roof.

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).


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.

Broken Hip rafter

See “Crippled Jack”

Capillary break

A groove or space left between two surfaces, large enough to prevent capillary movement of water into a building.

Ceiling joists

The joists that carry the ceiling and also form a tie between the feet of the common rafters.


A small piece of wood that reinforces or is used to position another (general larger) piece of wood.

Clipping batten

A batten installed to the rafters directly behind the fascia in traditional roofs. The clipping batten is used for installing the bottom course of tiles when sarking is not specified. Generally it is only used on homes with metal fascias, and only in high wind areas. The Tractile Interlocking Building System, being stronger and more water resistant, may reduce or eliminate the need for clipping battens in many circumstances.

Collar tie

The timber used to connect two rafters at or near their centres.

Common rafter

The main support rafter of the slope between eaves, wall plate and ridge.

Concealed gable flashing

A concealed gable flashing is a fibre cement verge strip running to the gutter line. Concealed gable flashing is subject to various regulations when it comes to the use of the galvanized metal flashing. These regulations vary between different regions.

Counter battens

A batten normally installed on top of and parallel to the rafters over the ceiling lining. Counter battens are used where roofers fix the ceiling lining on top of the rafters (exposed beams). Roofers then attach tiling battens to the counter battens, creating an air space that allows them to fit sarking between the rafters.

Cripple Creeper rafter

The rafter connecting a hip and valley.

Crippled jack or Broken Hip rafter

A rafter connecting the end of a ridge to a valley.

Dormer cheek

The upright side to a dormer or dormer window.

Dormer or dormer window

A vertical window or opening, coming through a sloping roof, usually provided with its own-pitched roof.

Dutch gable

A roof that has a gable near the ridge, with the lower part hipped.


The lowest overhanging part of a sloping roof that projects beyond the external wall.

Eaves fascia

A board on edge installed along the feet of the rafters. On traditional roofs it often carries the eaves gutter along the eaves. Tractile roofs include the gutter as part of the roof.

Eaves overhang

The inclined distance (line of rafter) from the outside of the external wall to the inner face of the fascia.

Eaves width

The horizontal distance from the inner face of the fascia board to 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.


The face or front of a building.


The slope or pitch of a roof or gutter.

Fascia board

A wide board set vertically on edge and fixed to the rafter ends or wall. Gutters attach to fascia boards for traditional roofs, but gutters form part of a Tractile roof and Tractile gutter tiles attach to other Tractile tiles at the base of the roof using the Tractile Interlocking Building System.

Flexible pointing

In traditional roofs, this is a highly pliable yet durable compound which, once cured, forms an incredibly strong bond between the tile and ridge capping. It is completely unnecessary in a Tractile roofs where every single tile and piece is connected to every other tile and piece with an incredibly strong bond. We call it the Tractile Interlocking Building System. We think it’s a lot better than glue.

Gutter tile

A Tractile tile, moulded to include a gutter piece, that fits to the lowest row of standard tiles.

Head or End lap

The distance by which one course of tiles overlaps the course below.

Hip creeper rafter

A rafter connecting a wall top plate and hip.

Hip end Tile

A sloping triangular roof fitting designed to cover the end of a hipped roof.

Hip rafter

A rafter following the line of the intersection of two roof planes.

Hipped roof (End)

A gable roof which has two additional sloping planes at either end of the roof.

Jack or Crown End rafter

A rafter installed at the end of a ridge and the meeting point of two hips.


Roofing trade term for stacks of tiles around the roofs.


The installing requirements and materials for sarking, battens, tiles and accessories etc, specified by the tiling manufacturer as sufficient to withstand the loading requirements of AS 1170.0 and AS 1170.0 Suppl 1:2000.

Mansard Roof

A roof structure with two pitches. The steep pitch commences at the eaves, and intersects with the lower pitch, which finishes at the ridge. Tiles on the lower pitch overhang the steeper pitch by a slight margin.

Mitred hips/valleys

Cut tiles on hips or valleys that form a true and straight line where the cut tiles join on each slope.


See "Bedding".


Used to describe the laying of various coloured tiles at a consistent percentage throughout the roof.


Short pieces of timber nailed between studs in a wall to brace the structure.

Parapet wall

Usually a brick or timber structure that rises above the roof line.

Picking up

The term used when the tiler is troweling off any excess mortar that may overhang the ridge capping after bedding. Roofers installing Tractile roofs might make better use of this term to describe what they will do to their mates earlier in the afternoon because a Tractile roof takes so much less time to install.


The angle or slope of the roof surface to the horizontal expressed either in degrees or as a ratio, eg 15° or 1:3.75.

Principal rafter

An upper member in a truss that has the same inclination as the common rafters.


The shape and design of the Tractile tile.


A sloping member that extends from the eaves to the ridge of a roof to support roofing material.


The roof’s angle of inclination from the horizontal.


The horizontal line where two planes of a roof meet together.

Ridge board

The horizontal board, set on edge, at which the rafters meet.

Ridge capping

A roof fitting used to cover the ridge-line that can be either ‘V’ shaped or arched (rounded). This generally consists of a specifically made tile used for both the ridge and hips of a roof. Tractile ridge capping fits to standard Tractile tiles with the Tractile Interlocking Building System.

Rigid pointing

Use in traditional roofs, this is a mixture of clean sand, cement and oxide colouring or pre-mixed flexible material, used for the completion of joints between ridge or hips and with roof tiles or tiles at gable ends. It is almost completely unnecessary in a Tractile roof, where each tile is connected structurally with the Tractile Interlocking Building system.


A covering to protect a building from the elements.

Roof tile

A product used to cover the field of the roof. Traditional roofs used concrete or terracotta tiles because the roof needed to be heavy. The Tractile Interlocking Building System allows you to use a greater array of more modern materials. With so many tile options of both visual and functional utility, Tractile tiles gives you complete control over not only the look of your roof, but how you use it too.

Sarking or underlay

A reflective, pliable membrane that is installed under the tile battens of traditional roofs, and conforms to AS/NZS 4200.1. (Underlay is not reflective in New Zealand). With tiles that can include insulation, and a much greater level of waterproofing, the Tractile Interlocking Building System, combined with Tractile materials, sarking is just another cost you will not have to pay when you install a Tractile roof.

Sawtooth roof

A roof structure that is vertical on one side with a slope down from the ridge line on the other.

Scribe board

A type of barge board shaped to match the overhanging profile formed by the under surface of roof tiles that overhang a gable end. The tiles are pointed up on the interlocking joints.

Secret gutter

A gutter usually fixed against a wall adjoining the roof slopes, concealed by the roof covering and vertical wall flashing, then spilling into an eaves gutter.


A close boarding or other material nailed to the framework of a wall or roof. Sometimes referred to as sheeting.

Side lap

The distance by which one tile interlocks with the tile beside it.


The term for a pitched roof with one plane.


A glazed window or translucent roof section fitted parallel to the roof slope to admit light. The Tractile Interlocking Building System allows you to fit a skylight as part of the roof itself, rather than as an addition, helping to maintain structural integrity and reducing the costs of installation.


The lining installed under the eaves between the fascia board and external wall.

Soffit bearer

Timber or metal used to support the soffit.

Staggered bond

The method of laying tiles where the vertical joint of every tile is laid to overlap with a half bond of the tiles in the course below.

Starter/Shell end

The first hip cap at the lowest point of the hip line.

Steel battens

Steel battens must be designed in accordance with, AS 2050.2, 2.2 and manufactured from metallic coated steel with a minimum coating class of Z275 or AS 150 in accordance with AS 1397. In corrosive areas, advice should be sought from the manufacturer.


A bitumen impregnated foam strip used to weatherproof areas of roof to prevent water penetration during storms. It is expensive, but is a necessary addition in many cases. With the increased water resistance that the Tractile Interlocking Building System supplies, most roofs require less Stormseal, or none at all.

Straight bond

Where tiles are not staggered but are laid directly on top of the tile in the course below, so that the vertical joints form one straight line up the slope of the roof.


A vertical wall support.

Tile clip

A specially formed metal fastening used to secure tiles to supporting members.

Tilting batten

Serves the same purpose as a “Bellcast batten”.

Top plate

The horizontal member above a wall on which the truss or rafter sits.

Truss roofs

A roof supported by self-supporting, triangulated structural framework. This type of construction is the most common for all types of roofs and is usually prefabricated and delivered to the job site.

Under purlin

A horizontal member in a roof at right angles to the principal rafters or trusses. It carries the common rafters.

Upright work

Tiling carried out on a roof pitched close to vertical, normally on a façade or a mansard roof.


The internal angle formed by the meeting of two sloping surfaces of a roof; the opposite of a hip. A valley tray is installed in this area to direct water to the gutter.

Valley creeper rafter

A rafter connecting ridge and valley.

Valley iron/Valley tray

A "V" shaped sheet lipped on each outside edge and formed to fit into the angle of a valley.

Valley rafter

A rafter following the line of the internal intersection of two roof surfaces.

Verge Course

See “Barge Course”

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