Correct hole sizing prevents rework, leaks, and damage. Match size to application, allow clearance, verify thickness and angles, coordinate with trades, and confirm on site before drilling begin
Steps to Get the Right Size
1. Match to application
Choose core sizes based on use: small for conduits/anchors, mid for plumbing, larger for HVAC and sleeves. Matching application ensures functional clearance and compliance with installation standards.
2. Add clearance
Allow additional diameter for insulation, couplings, fire collars, and construction tolerances. Adequate clearance avoids forcing services through cores, preventing damage to finishes and service components.
3. Check thickness and angle
Confirm wall or slab thickness and whether angled drilling is required for gradients or alignment with service routes. Thickness and angle influence bit selection, rig setup, and drilling duration.
4. Coordinate with trades
Consult plumbers, electricians, and HVAC installers early. Coordination prevents undersized, misplaced, or misaligned cores, ensuring seamless installation and fewer site changes or penetrations later.
5. Mark and verify
Mark centres from fixed references, double-check measurements, and get a quick sign-off before drilling. Verification avoids costly relocations, patching, or redrilling after the fact.
Pro Tip
When uncertain, step up to the next core size—it’s usually quicker and cleaner than grinding or chiselling to widen a finished opening.