Where am I allowed to drill through a floor joist?
| Joist depth | Max hole | Keep clear of |
|---|---|---|
| 150 mm (6 in) | 50 mm | 50 mm from top and bottom edge |
| 200 mm (8 in) | 65 mm | 50 mm from top and bottom edge |
| 250 mm (10 in) | 80 mm | 50 mm from top and bottom edge |
| Engineered I-joist | Follow the manufacturer chart | Never cut the flanges |
Why the middle third: the top and bottom of a joist carry the tension and compression. A hole at the edge cuts the fibres doing the work; a hole in the middle removes material that is barely stressed.
Practice: mark every hole before drilling, and drill from one side so blowout lands in the waste side. An auger bit for timber, a hole saw for pipe sleeves, and a step drill for steel web stiffeners.
Hole Saw Set, 8 pcs, M42 bi-metal, 16-40 mm — $49
Price includes US duty, international shipping and customs clearance. In stock. Dispatched within 48 hours. Delivered in 7–12 days, tracked. 14-day returns, we pay return shipping. No US state sales tax collected.
| Product | Price | Pieces | Weight |
|---|---|---|---|
| Hole Saw Set, 8 pcs, M42 bi-metal, 16-40 mm | $49 | 8 pcs | 900 g |
| Cobalt Drill Bit Set, 21 pcs, M35, imperial, metal case | $59 | 21 pcs | 717 g |
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Options we stock
| Product | Price (duty and shipping included) | Weight | Delivery |
|---|---|---|---|
| Hole Saw Set, 8 pcs, M42 bi-metal, 16-40 mm | USD 49.00 | 900 g | 7-12 days |
| Cobalt Drill Bit Set, 21 pcs, M35, imperial, metal case | USD 59.00 | 717 g | 7-12 days |