Drilling Holes Plumbing Through Floor Joists

How to drill a hole through the side of a floor joist.

Drilling holes plumbing through floor joists.

I noticed that quite a few people have a common concern that drilling holes in joists will make them weaker. Even if you are going to drill a hole through the joist one of the problems you are going to get is threading the pipe through and you don t want any joints in the ceiling space. But modern living requires electrical wiring and plumbing. 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.

Holes cannot be closer than 2 to the bottom or top of a joist or to another hole or notch in the joist drilling floor joists. The maximum allowable diameter of a hole in any solid lumber joist is one third of. I m here to let you know that you can safely drill holes in joists by following a few simple guidelines. The hole cannot be larger than one third the depth of the joist so the maximum hole size for a 2 12 joist actual size 1 1 2 x 11 1.

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. From the top and the bottom if it s a dimensional lumber joist. Drilling floor joists to run plumbing wiring or ducts can be tricky. There are regulations in the uk you must follow in new build insta.

But the pipe will be above floor level or thereabouts especially if you use a shallow trap. Drilling holes in joists for plumbing and pipes is easy and we show you how in this video. In a perfect world floor joists are left whole to provide the greatest support. There are very specific locations and sizes in the code telling you what is allowed.

Where and how to drill joists for electrical cables or plumbing runs depends on what type of floor framing you have. I hate putting waste pipe through joists for the reasons. You often require drilling holes in ceiling joists to pass any electrical or plumbing runs through the ceiling or floor. Use our calculator to ensure your holes and notches are in the right position and do not affect the structural integrity of the building.

Keep the hole at least 2 in.