# Readers ask: How Close Can Holes Be Drilled In A Joist?

Holes must be located no closer than two inches from the top or bottom of a joist or any other hole or notch. Any closer than that, the remaining wood in the joist may not be sufficient to transfer load across the opening. The size (diameter) of the hole must not be more than 1/3 the joist’s depth.

## How many holes can you cut in a floor joist?

The maximum hole size is 1/3 the joist’s depth. You can cut a notch at the end of the joist to 1/4 of the joist’s depth (maximum). Along the outer third of a joist, you can cut a notch a maximum of 1/6 the joist depth and 1/3 the joist length without compromising its strength.

## Do holes weaken joists?

The larger the hole, the greater the reduction in strength. Generally speaking, will a 1-1/2” hole in the dead center of a board (say, the biggest common hardware store found material: 2×12 Doug fir) weaken the structural integrity of the board regardless of the length, knots, etc.? Generally speaking, yes.

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## What are the codes for drilling or notching joists?

Holes bored in joists shall not be within 2 inches (51 mm) of the top or bottom of the joist, and the diameter of any such hole shall not exceed one-third the depth of the joist. Notches in the top or bottom of joists shall not exceed one-sixth the depth and shall not be located in the middle third of the span. R502.

## What is the minimum distance apart that two holes should be drilled in a timber joist?

Adjacent holes must be at least three times their diameter apart and no hole may be within 100mm (4”) of a notch. Measure the clear span between supports and the joist height. E.g. 3.0 m (10’0”) and 150mm (6”).

## How big of a hole Can I drill in a 2×8 floor joist?

The maximum allowable diameter of a hole in any solid-lumber joist is one-third of the joist’s depth. Notches can’t be deeper than one-sixth of the joist depth. In the case of your 2×10 joists, the maximum diameter is 35⁄64 in.

## What is the maximum allowed distance of a hole in a joist from a bearer or a wall?

The maximum allowable depth of notches is one fifth of the joist or rafter depth or 32 mm, whichever is less. Holes may only be located within a length measured from the face of a support that is no more than three times the depth of the joist or rafter.

## How deep should a pilot hole be?

Pilot holes guarantee that your screw won’t break off and your wood won’t crack. For most hardwoods, the pilot hole should be at least as large as the screw’s minor diameter. If the screw has deep threads, or the wood is very hard, the pilot hole should be another 1/64-in.

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## Should pilot hole be smaller than screw?

As a general rule of thumb, your pilot hole should be slightly smaller than the diameter of your screw. It is best to err on the smaller side when choosing a bit; a pilot hole can always be made bigger, but not smaller.

## Do you always need to drill a pilot hole?

Pilot holes are necessary if you’re drilling into hardwood, laminate, or need a precisely located fastener. They’re also recommended if the wood is likely to crack, or if appearance is important. You can skip the pilot holes when doing a rough build with softwood where appearance isn’t important.

## How much of a joist can be notched?

Should be no deeper than 0.125 times the depth of the joists. Should be no closer to the support than 0.07 times the span and no further away than 0.25 times the span.

## Where do you drill holes in wood beams?

Only drill within the 1/3 middle of the span horizontally and the 1/3 middle vertically. 3. Never drill holes of the same size next to each other. Vary the vertical location of holes.

## Is it OK to drill through joists?

You can drill the holes anywhere along the length of the joist (first photo). If you have manufactured I-joists, you can drill holes up to 1-1/2 in. diameter almost anywhere in the web area (the area between the flanges).

## Can I run 32mm waste pipe through joists?

Can a waste pipe go through a joist? Running waste pipes through joists should be avoided where possible, as any drilling of joists (also known as notching joists) may weaken them and compromise the structural integrity. Notches must be no closer than 0.07 the span of the joist to the structure supporting them.

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## Why is it important to drill through the Centre of the joist?

The top of the joist is in compression, and more so in the middle, and the bottom of the joist is in tension. So notching in the middle is bad, and is relegated to the edges.

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