Keep drainage installations lined up
Matched core diameters
We allow for pipes, fittings, seals and tolerances when sizing each opening.
Consistent repeated holes
Careful setting out keeps grouped penetrations aligned with the planned layout.
Efficient slab drilling
A prepared repetitive setup can keep larger quantities moving at a steady pace.
Correctly sized routes for drains and outlets
A drainage penetration must be large enough for the pipe and fittings, but not so loose that sealing becomes awkward. We drill accurate circular holes through walls and slabs for drainage pipes, outlets and related service routes. We consider the component diameter, fitting size, fall and installation tolerance before confirming the core. On repetitive layouts, consistent setting out matters just as much as drilling speed. In one recorded project, we completed 35 holes in the same slab, each 75mm in diameter and 150mm deep, within three hours under suitable site conditions.
Multiple holes set out before drilling begins
We first check slab thickness, likely reinforcement, spacing and the position of hazards or services below the surface. Access beneath the drilling point can affect both safety controls and how cores are collected. For grouped penetrations, we mark each centre against the approved layout before starting, reducing the risk of a tidy hole in the wrong place. Programme estimates depend on the material and conditions, so photographs, drawings and clear dimensions help us choose the rig and prepare a realistic sequence.
Frequently asked questions
How much clearance should a drainage core allow?
The answer depends on the pipe, fitting, sleeve and sealing method. We need the installer's required opening size rather than the pipe diameter alone. Allowance may also be needed for the intended fall and positioning tolerance.
Can you drill several drainage holes in one slab?
Yes. We mark out the full pattern before drilling so spacing and centres stay consistent. In suitable conditions, a repeated setup can be efficient, but reinforcement, access and changes in slab depth can alter the programme.
What must be checked below a drainage hole?
Known services, hidden hazards and access beneath the slab must be considered before drilling. We also need to know what occupies the area on the far side so we can control the core, water and slurry safely.