Drilling Holes: Floor Joists - A Quick Tutorial
HTML-код
- Опубликовано: 30 дек 2022
- If you are going to do drainage plumbing, you will need to know how to drill holes. But you can't just drill through anything or anywhere. The wood structure is holding up the building, so you'd better know where you can drill.
When drilling solid wood joists, you are not allowed to drill in the top two inches or the bottom two inches, and the hole cannot be any larger than 1/3 height of the joist.
When drilling I-joists or TJIs you are not allowed to cut, notch or drill the top or bottom structure of the joist. You can drill through the OSB webbing of the joist, but you must keep a distance from the bearing ends of the joists. In general, for every 1inch of hole you are drilling you must stay away from the bearing point 1 foot.
Glue laminated beams or glue-lams are designed to hold more weight than a TJI, so in general they should not be cut, notched or drilled. However, with permission from a structural engineer, you can drill in the very center of the beam, but the size will be limited.
Floor trusses have a lot of open space for running pipes through. They are not to be cut, notched or drilled at all.
These are just general rules. for specifics, you should look up the specifications from the manufacturer.
When it is time to drill holes, you will need to mark them out first. Calculating the slope of a pipe, and making adjustments to the center of the hole from one joist to the next will allow you to run a pipe through joists with slope. Also, to create a straight series of holes for the pipe to run through, you will need to measure from something that runs parallel, like a wall and mark each joist.
There are a variety of hole saws that can be used for drilling holes. Some of these options are demonstrated in this video.
In the end you must understand that drilling holes is hard physical work. But working hard is good for the body, mind and soul! So enjoy your time s you work out drilling holes for plumbing! 
Развлечения
Wow! One of the best hole drillers I ever saw! :) Anyway, seriously, good video.
Thanks.
Kickass animations!
Thanks!
@@plumber-tom9470 yes...that really helped...very well done
That’s a great video, short enough to watch, no wrong info, really well done. 13 years as an electrician here, we usually just use a hammer though.
Thanks. I try to keep it short and to the point.
Electricians can do it that way. I think plumbers should manage PEX differently than wires.
I'm a GC. I was at one end of the house with nobody doing work but me and an electrician. I heard some banging from the other end of the house.
He literally was knocking holes in my newly built and freshly painted walls with his hammer!
"Stop! Just tell me where you want the holes. I'll cut them for you".
He never hired him to do work for me again.
Yikes! Some tradesmen are quite savage! @@RalphSampson...
Hard work is good for us! That's right, let's go do hard things
Thanks Jared! You’re a pro at hard work!
Let me guess. You work at a hair salon or worse a doctor and have no calluses on your hands.
You constantly wash your hands and they are soft as a baby's bottom.
I’m instructed to drill a 5” hole in a 2x12 standard joist in a basement for a 3” pvc pipe. I have a heavy right angle Milwaukee holehawg. Will this be difficult drilling with 12” spacing between joists?
Good question. 5” hole seems big for a 3” pipe. 3” pvc has an outside diameter of around 3 1/2”. With a fitting it is closer to 4”. My point is that you want to keep the hole size as small as possible to preserve structure.
To answer your question, yes that might be right to get your drill in between joists. Hard to say until you try.
Good luck.
great video! In solid wood joists, if the drill holes are over 1/3 of the board, it is possible to solve by metal joist reinforcement kit?
Good question. I’m afraid I don’t know the answer. Best to talk to a structural engineer about how to repair or reinforce joists.
The normal recommendation is to splice (glue) 3/4” plywood to each side of the beam about 18” long and full beam height (9.5” for a 10” beam). Then drill through that spliced area.
As a plumber ijoists are great. Laminate beams not so much
well said.
Service is the way to go, i dont like new construction, you make more in service too.
I agree. I ran a service business for 10 years. Much more lucrative than residential new construction.
BCI joist basically you only have to stay a foot off of load bearing points
Thanks for the clarification.
a HALF INCH EMT is a 7/8ths bit. My boss thinks he needs to drilll EXACTLY the size of the friggin pipe, making it hard to work with!! OMG!!! I swear!! I dont know where he learned to run pipe! LOL
It is not good to have the whole that tight. Pipe expands and contracts, so it needs room to move through the studs. Plus, as you point out, it is a lot harder to install if there is not a little wiggle room.
@@plumber-tom9470
I would think a tight fit in the hole would cause squeaking, too. Leave some room for movement is a good idea.
well said. @@RalphSampson...
If an electrician drilled a 3/4 inch hole through one of these glued together beams. I stopped him before he make it all the way through.
Will it be ok? Do I need to call a structural engineer?
It’s a beam going across my garage about 3 inches from where it meets the wall.
I’m not an engineer, but I think it is ok. Usually they will allow for holes in the middle of the beam. I think up to one inch is not a problem.