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How to Mend a Tiled Roof
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STEP 1
Preparing the tiles
Remove loose caps and chip away
old mortar. Sweep the roof. Chip old
bedding from caps using an angle
grinder for stubborn pieces. Attach
small cut tiles by nailing a 75mm
galvanised flathead nail in the top of
the hip rafter and secure with wire.
STEP 2
Mix the mortar
Lay caps in position and mark
with chalk. Mix four parts bricklayer’s
sand to one part cement, add water
until creamy. Lay sausage-shaped
mortar inside the chalk line. Secure
starter cap with wire around a 75mm
galvanised flathead nail 150mm above.
STEP 3
Lay ridge caps
Press in the starter cap, keeping
mortar 20mm thick at highest point of
the tile. Lay all the caps. Fill gaps with
mortar and flush to the edge of the
cap. When dry, trowel flexible coloured
pointing compound 5mm thick over
the mortar and collar of the caps.
Mortar makeover
Mix just three bucketfuls of mortar
at a time as it needs to be used
within about 45 minutes.
Apply only enough mortar to lay
two caps at a time as the mortar
should be tiled over within about
10 minutes of being laid.
Add a little water regularly to
mortar for a workable consistency.
Mortar should stick to the trowel
but slide off when the trowel tilts.
Be Neat when applying flexible
coloured pointing compound.
Use flexible coloured pointing
compound at 45º over cap collars
for a good weather splay.
Weep Holes are needed at the
flat point of every second tile
when laying concrete ridge caps.
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