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joist

A joist is a horizontal structural member used in framing to span an open space, often between beams that subsequently transfer loads to vertical members. When incorporated into a floor framing system, joists serve to provide stiffness to the subfloor sheathing, allowing it to function as a horizontal diaphragm. Joists are often doubled or tripled, placed side by side, where conditions warrant, such as where wall partitions require support.
Joists are either made of wood, engineered wood, or steel, each of which have unique characteristics. Typically, wood joists have the cross section of a plank with the longer faces positioned vertically. However, engineered wood joists may have a cross section resembling the Roman capital letter "I"; these joists are referred to as I-joists. Steel joists can take on various shapes, resembling the Roman capital letters "C", "I", "L" and "S".
Wood joists were also used in old-style timber framing. The invention of the circular saw for use in modern sawmills has made it possible to fabricate wood joists as dimensional lumber.

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  1. D

    Clipping Pipes running though metal web joists

    Hi Guys. This is a question on how to clip central heating pipes (Hep2 15, 22 and 28mm) when running 90 dgrees to metal web joists. How to do it and look good. I could use a load of Britclips with a section of wood accross, clip to that. Or use the electricals trays, and clip to that...
  2. P

    Lining old joist notches to prevent expansion noise

    Has anyone tried lining joist notches with a low friction, high temperature resistant material to prevent the bangs when a pipe expands and momentarily sticks on the joist?
  3. P

    Shower waste hits joist slightly

    Hi folks, Got a cracking deal on a stone resin shower tray but unfortunely it hits the joist slightly. The joist is around 3.25" wide and 6.75" tall, and I would have to cut out a vertical notch from the joist of 1.15" (at the max, it will probably be less than this) for it to fit. Would...
  4. B

    Pipe best used for joist floors

    What pipe for plumbing Radiators and domestic do most plumbers use for upstairs with joist floors on new builds these days iv used copper and hep but resently bout a press but never tryied it on a 1st floor with joists is it viable to do it with the 16mm pipe and 20mm pipe as its not as...
  5. Steve DM

    centering toilet/waste but joist in the way

    Hi all - newby here just hoping someone might come up with a clever solution to my problem. Recently put a toilet in, and although I can live with it the way it is, I'd like to see if there is some way I can move it slightly to the left, and have it centered in the space it sits in, see...
  6. P

    Chasing radiator pipes through joist and wall

    Hi all, hoping there are answers out there to my small dilemma. A customer of mine wants 15mm radiator flow and return pipes chased into the block wall and pop out down the bottom. Problem is the joists are close to the wall so to start the chase in the block i will have to notch out the joist...
  7. P

    Running pipe INSIDE floorboard?

    I need to run central heating pipe horizontally under the floorboards of an upper floor. I need to go through only one 75mm wide beam, but I'm wary of boring or notching it, also because that would be quite close to the wall bearing the beam. So I thought of running an 8mm or 10mm pipe...
  8. Suzan

    Joist not reaching the end

    We are redoing a wet room on the ground floor and we have uncovered the floor boards. I'm looking at this and I'm totally baffled.... the joist doesn't even reach the end of the room... what's supporting it is a mystery to me... What's the best way to fix this? It's a bit of a disaster...
  9. A

    How much joist can be cut out fo CH pipes

    Hi all, Heating engineer has curved 15mm ch pipes where the wall meets the ceiling instead of notching the joist further and putting them at a 90 degree angle so completely hidden when ceiling is boarded and wall bonded then plastered. He explained that he couldn't notch out the joist anymore...
  10. S

    Copper tees (soldered) through joist

    Considering many options for dealing with plastic pipe / fittings under a tiled floor, which are difficult to get to because they sit very close to the top of a brick wall i.e. extremely limited access through ceiling downstairs! The floor will ultimately be tiled. There are 4 x 22mm-to-10mm...
  11. O

    CH radiator routing pipework from ceiling around joist tight to the wall

    Hi All, 1st post on here and hoping someone can help out. Im in the early stages of a garage conversion; I've temporarily hung the vertical radiator where its planned to go and my plumber has routed a couple of feed and return pipes in ceiling; i've attached a couple of photos showing the...
  12. O

    CH radiator routing pipework from ceiling around joist

    Hi All, 1st post on here and hoping someone can help out. Im in the early stages of a garage conversion; I've temporarily hung the vertical radiator where its planned to go and my plumber has routed a couple of feed and return pipes in ceiling; i've attached a couple of photos showing the...
  13. A

    UK Cowboy plumber & electrician put notch/holes everywhere in the joist

    Hi, You may have seen my post from 2-3 weeks ago about the troubles I was having with cowboy builders/electrician/plumber/gas engineer that I had the misfortune of hiring. Today, I decided to lift up the floorboard to see how they ran the wiring and pipes around the joist and was horrified to...
  14. Pickwickpick

    Treating leak affected joist ends

    Went to quote on a job last night where a bath was fitted few years back with no frame and only 3 of the metal feet actually connecting to the floor. Needless to say it's not been stable and the silicone seal around the edge failed and has been slow leaking water at good couple of years. The...
  15. 1

    UFH Joist system and Manifold selection - Evohome

    Evening all I have been researching the hell out of this, following my last project. Currently ripping half the kitchen out to remove a wall and make our downstairs open plan - If you wouldn't mind me running my plans by you to hopefully pick any obvious holes in. Current floor is standard T&G...
  16. H

    Joist reinforcement for soil pipe hole

    Hi everyone need a little help. I am planing on moving my bathroom and need to run a new soil pipe. Luckily for the most part the joists don’t get in the way except at either end of the run. My joists are 175mmx60mm, obviously I don’t have death wish so can’t just punch a 115mm hole either end...
  17. P

    Suggestions for radiator pipework route around joist

    Hi All, I am currently renovating my house (first home) and what started as a bit of paint has somehow escalated.....so, on the list of current jobs is central heating and radiators throughout. I've hung most of the radiators and chased down walls in three locations (for downstairs radiators)...
  18. plumb_know

    joist weight capacity?

    Hi Everyone, Just wondered if anyone can recommend good site/book for working out load bearing of joists (also good book for general construction/building). i am quoting a job and 300litre cylinder would be preferred but worried about weight as on 1st floor in airing cupboard. luckily they...
  19. A

    40mm Waste Pipe through joist

    Hi, Does anyone see any issues taking my waste through the 200 x 75 joists. Was going to put a 50mm hole through centre of it. Cheers, Anthony
  20. M

    Swapping joist

    I went out to a toilet today and the customer said you might need to change the floor board as well as it has got a bit wet. Well that was the understatement of the century I stood on the floor and it sank by about 2". So I ripped the floor up and had a look and the 1 joist has started...
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