i need to drill 4 holes to put up a small glass shelf above the sink. the
tiles are on a plasterboard wall with brick behind. do i just use a masonry
drill bit? what if the drill is under size, can i open up using say the next
size up or would this crack the tile.
plugs look to be around 6mm but no markings on them.
You use a special drill for ceramic tiles, which is flat
and looks like an elongated "spade" from suits of cards.
Put some tape over the area to be drilled so the bit
doesn't skate around before biting in the wrong place;-)
Don't use hammer action. Once you're through the tile,
switch to a normal bit.
The hole through the tile needs to be over-sized so the
plug can pass right through. You don't want the plug to
grip the tile as it may crack it when the screw is done
up and the plug expands. Also, you want the plug to grip
the wall, not the tile. You may need longer screws than
were provided to get through the tiles to the wall.
Use masking tape at the drill point, mark the hole point with a cross and
then use an ordinary engineering drill, start with a small pilot drill and
increase in drill sizes to just over the diameter of the rawlplug. Don't use
hammer action when drilling the tiles, then use the masonry drill through
the hole in the tile, using hammer action..
I've just fitted a cistern using this method; although care is required.
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