Rogues Gallery

Holes through walls should be drilled from the outside, though the mortar joint, whenever possible. It’s also a good idea to drill ‘uphill’ a bit, to discourage water from creeping in. But of course sometimes the hole has to be drilled from the inside, for instance when the cable is to enter an existing flush backbox from the rear. In such a case, measure the wall thickness by looking at a window or door opening and then turn the drill’s hammer action off for the last inch or so. If the wall is rendered get someone to hold a thick board or a short batten tightly against the surface to hold it together as the drill comes through. But tell them to mind their fingers!

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