joists

joists

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  1. P

    BS7671/ drilling joists.

    Hi all, my name is Pete and I’m new to this site. Could anyone clarify the following question for me please. Does BS7671 cover rules on acceptable locations to drill holes in joists in commercial properties. If so could anyone state the page number where I could find this. I’ve been working...
  2. C

    Downlights touching joists

    Our electrician has fitted these LED downlights: https://ansell-lighting.com/en/products/prism-pro-cct-fire-rated-downlight-dual-wattage Due to space constraints and equal spacing in the room, there are a couple of instances where the light is right next to and almost touching the joist above...
  3. HappyHippyDad

    Running LV and ELV cables together through joists?

    I have quite a bit a cat5e to run through joists under floorboards for ethernet points around the house. Can this run in the same joists as the LV cables or do you make separate holes in the joists for the ELV cables? Cheers guys.
  4. P

    Drilling joists vertically

    I don’t know if you would be able to help me. I want to drill 2 x 25mm and a 20mm hole through these joists to get into the loft. Is drilling vertically through joists allowed? It’s a bungalow so there’s only the loft above but the only info I can find is about drilling horizontally rather...
  5. W

    Wiring through joists in an insulated floor

    Hello, I'm about to start a complete house refurbishment, including rewiring and insulating between floors. As I understand it building regs require you to drill holes through the center of joists 0.25-0.4 along the span of the joist - this is going to put my cable run ~75cm away from the...
  6. D

    Downlight min distance to joists

    Yes that one again - been answered a millions times BUT often the answer is do what the MI say. I have the Enlite DLM982x and it doesn't specify any distances. Obvisouly I'm fitting LEDs but these cans would in theory allow a halogen. SO, belts and braces seems to suggest 50mm but could I fit...
  7. R

    Running wiring in a garage ceiling joists.

    Hey folks, I had a couple of questions regarding running electrical cables in an attached garage. Any help is appreciated. #1. I am installing a recessed sub-panel in my attached garage. I will be running 2-2-2-4 cable from the main panel to the garage through my attic crawl space. The cable...
  8. mattg4321

    Metal web / posi joists

    I don’t work on many new builds and the builders I usually work for don’t use them, so this is the first time I’ve come across posi joists at work. I suspect I know the answer as to what usually happens here when running cables - ie they’re just lashed in ‘bow and arrow’ style, but does anyone...
  9. LewisM

    LED Downlights Cut into joists

    Hello, I replaced some halogen down lights that had been fitted for about 15 years with some GU10s with LED Lamps in them I notices that three of them where cut into the joists a tad and had pipes hard up against them, do you think this is reason to move them or just leave as be, the old...
  10. B

    Guidance on running cables through joists please

    Hi, I’m adding a heat detector into my existing smoke detector system. The new detector will be inspected and commissioned by an electrician, but I’m fitting it to the ceiling and running the cables to save time taken by a professional (their suggestion as they are very busy). This is already...
  11. C

    Boarding attic, wires over joists, advice needed.

    Hi there I’m boarding my attic and the wires are going over the joists, I know I can chisel a grove in the chipboard board or take the wires out of light fixture. I was just wondering would it be a bad idea just to made a grove in the top of the joist with a round rasp just big enough for the...
  12. B

    Holes through joists

    Hi all Question regarding the amount of cables through holes in joists. Is there a set amount that you should stick to, or does it not matter how many cables are through a joist hole. As long as there is movement in the cables, finger gaps side of cables, reason i asked as seen about 8/9 cables...
  13. FatAlan

    Getting across ceiling joists from below - tricks of the trade.

    In the day and age of ..how many downlights can we get into one house, I'm intrigued to know what tricks / techniques folks use to install multiple downlights into an existing ceiling in replacement of a central pendant. In particular, once having located the joists, how do you get the cables...
  14. A

    Routing new cables under floorboard

    Hi guys after a second option here In the process of a rewire and I’ve lifted upstairs floorboards on the landings suss out my route for new upstairs ring, lighting and boiler circuits. The joists within the landing have a 25mm hole for existing up and down lighting circuits and no room left...
  15. D

    Running 10mm T+E under celler joists.

    Hello, Whilst doing some building works I have access to the inside of the stud wall to which the consumer unit is fitted, so full and easy access to all the cabling there. This wall is soon to be tiled. In the future I will want to put power into a garage at the end of the garden. I happen...
  16. rolyberkin

    Angle drill for joists

    Does anyone have a dedicated battery angle drill or an attachment, if so are they worth buying? Have to drill out joists at 400mm centres for 15mm pipes and cable runs and was looking at a Dewalt DCD 740N, however wondering whether a drill attachment for £15 do the same job?
  17. S

    Fixing a miss-drilled beam

    I'm building a flat-roof extension on my house and I've got a guy helping me. Sadly he's miss-drilled the holes in the joists right next to the wall (within 70 mm) instead of .25 - .4 of the beam length. Actually, it looks very nice, but not in line with BRs. If we move the wiring (and pipes...
  18. W

    Cables through drilled joists

    Hello peeps, just looking for clarification on my practices here . In the past , I have taken many cables through the same hole drilled in a joist . Mostly lighting and smoke detector cables , not heavily loaded ones , but on site , time is sometimes critical. Have I followed " normal practice...
  19. snipersmith87

    Downlight advice - joists / spacing guide

    What are people's methods of installing downlights?? Rule of thumbs?? Spacing?? I installed 14 today in a kitchen. 2 banks of 7 at just over a metre apart. 650mm from walls. Problem is joists. felt like it took an eternity just to mark out as I would inevitably land on joists somewhere along my...
  20. Pat H

    Drilling joists

    Doing a loft conversion and wondering about joist drilling. OSG states to drill in the middle of the joist 0.25 to 0.4 of joist length. I have 6" joists but the bottom 4" will be filled with 100mm celotex so If I drill at half way my cabling will be in the way of the insulation. It makes more...

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