Certificate III in Roof Tiling flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Minimum fall-arrest trigger

Fall protection is required where a person could fall 2 m or more; systems include guardrails, scaffolds, and harnesses anchored to a rated point.

Roof pitch ratio

Pitch is rise over run, such as 1:4, and it sets minimum sarking laps and the tile and flashing types permitted for the roof.

Sarking side lap

Adjacent sarking sheets overlap at least 150 mm, with the upper sheet lapped over the lower so water runs down and away.

Batten gauge

Batten spacing equals tile length minus head lap; it must match the manufacturer's gauge so each course covers the tile below.

Roof dead load

Tiled roofs typically add 40 to 60 kg per square metre; confirm rafter and truss capacity before laying and spread tile stacks.

Ridge cap mortar mix

Ridge and hip caps are bedded in a stiff sand and cement mortar, commonly three parts sand to one part cement, or a flexible compound.

Flashing lap rule

Flashings are lapped so the higher element overlaps the lower by at least 150 mm, and no lap faces upward to collect water.

Asbestos stop-work rule

Suspect sheeting on older roofs must not be cut or disturbed; stop work and arrange identification and testing before proceeding.

Eave overhang check

Tiles usually project 40 to 50 mm past the fascia; too little causes water tracking back, too much risks breakage and poor appearance.

Valley clearance

Valley gutters must stay clear of tile and mortar so runoff is unobstructed; blockages cause backup and leaks under tiles.

Tile head lap purpose

The head lap is the overlap of one course over the next; it sheds water and its size depends on roof pitch and tile profile.

Ladder safety ratio

A leaning ladder is set at a 4:1 ratio, one unit out for every four units up, and secured at the top before use.

Manual handling limit

Team lifting is required when a load is too heavy or awkward for one person; tiles are handled in small, balanced stacks.

Roof plan reading

Plans show pitch, ridge and valley lines, penetration positions, and batten layout; check them before setting out any battens.

Tile cutting control

Cut tiles with a wet saw or score-and-break tool; wear eye and hearing protection and control silica dust with water or extraction.

Terracotta versus concrete

Terracotta tiles are fired clay and typically heavier and more porous than concrete tiles, which affects batten and rafter loading.

Steel roof minimum pitch

Corrugated steel commonly needs about 5 degrees with end laps, and roughly 3 degrees for continuous long sheets without end laps.

Cladding cavity depth

A drained and ventilated cavity of at least 20 mm sits behind wall cladding, with weep holes and base flashings for drainage.

Shower membrane height

Waterproofing extends at least 150 mm above the floor and 25 mm above the hob, with the floor graded toward the waste.

Floor fall to waste

Wet-area floors are graded between 1:80 and 1:100 to the waste so water drains and does not pond on the membrane.

Tile quantity formula

Tiles needed equal roof area divided by coverage per square metre, multiplied by one plus wastage, usually five to ten percent.

Scaffold platform width

A working platform is at least 450 mm wide, with a top guardrail at 900 to 1100 mm, a mid-rail, and a toe board.

Penetration flashing

Each pipe or vent penetration uses a collar or dektite flashing sized to the pipe and pitch, sealed against the tile profile.

Repointing trigger

Repointing is needed where ridge mortar has eroded about 10 mm or more; remove loose mortar and wet the surface before re-bedding.

Wall cladding fixing

Cladding is fixed to framing through the cavity with corrosion-rated fasteners at the manufacturer's spacing, allowing for movement.

Gutter slope

Gutters fall toward the outlet, commonly about 1:500, so water drains and does not stand and corrode the gutter.

Downpipe sizing

Downpipe capacity is matched to the roof catchment area and rainfall intensity; undersized downpipes cause overflow at the gutter.

Insulation placement

Roof insulation sits on the ceiling with clearance from downlights and flues; sarking may act as a radiant barrier beneath tiles.

Skylight flashing

Skylights use a proprietary flashing kit matched to roof pitch and profile, lapped into the tile courses above and below.

Wet-area leak test

After the membrane cures, the floor is flooded and left standing to check for leaks before tiling proceeds over it.

Roof ventilation

Ventilation at ridge and eaves reduces condensation under the roof; blocked vents cause moisture damage to battens and framing.

Site waste handling

Broken tiles and offcuts are separated for recycling or disposal, and silica dust and mortar waste are contained on site.