joist

joist

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  1. T

    Drilling through domestic joist

    Hello, I need to run a mains spur off the existing ring main in a domestic property. To get the double socket to the correct place I have to drill through several joists. I understand that there are building regs on this. Can some provide a link to the regs or info that clarifies what I need to...
  2. P

    Opening up holes in joist

    A friend of mine is looking to have an electric shower fitted and has floorboards up already (mostly, long story). Anyway there is a run of 2.5mm T&E already following a sane route that the 10mm T&E for the shower could take, but the holes are just a bit bigger than 2.5mm and certainly not...
  3. L

    Hole drilled in TJI Chord/Flange

    So I had a ceiling repair done in my bathroom due to water damage. The neighbors toilet above me was leaking for who knows how long. Mold between the two layers of ceiling drywall, moldy wet insulation which caused some soft webbing between chords/flanges. Handy man company sistered it by just...
  4. J

    Posi joist wiring ref

    Evening What ref method would you give t/e running the web of a posi joist? 100mm insulation below the posi joist then a MF and plasterboard ceiling below that Cable not touch insulation Cable touching:clipped to posi joist
  5. D

    Cables run in Wolf Easi joist system

    Hi Guys Im wiring a domestic dwelling that has the Wolf Easi joist fitted. The central web is great is running services, but how do you fix cables running with and at the normal to the joists? My first thought was mini trunking say 100 by 100, then we should to do grouping calcs. Why trunking...
  6. J

    Electrician has cut holes to close to joist ends

    Hi Employed electrician to wire extra sockets in bedrooms upstairs in an empty house. However I have noticed when I lifted floor board up to do other work, that the cables are running through holes close to ends of the joists, not within the safe zones, .25 & .4, as with Building Regs...
  7. S

    Hole in joist - question on span

    I need to make a hole in a floor joist - I know it needs to be within 0.25 to 0.4 x the span, and in the middle of the joist etc, but I can't find a clear answer on what the span is when there is a supporting wall in the middle. Is the span seen to be between the outer wall, and the supporting...
  8. 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...
  9. L

    Notching the side of a joist?

    I know the regs for the regular notching of joists, but I can find nothing about notching up the side of a joist. I need to route my cables up past a large wooden beam 4500mm x 400mm, 115mm thick. Do the normal rules apply? 0.07-0.25 of the length and 0.125 of the depth? Or is it a no go? Cheers
  10. B

    Cable in narrow space - how to fix it?

    10mm 2+e must run in a 30mm wide gap under floor between wall and joist. Must also be >50mm from surface or enclosed in earthed metal or impenetrable armour. The distance is only 1m. It is not possible to reach 50mm down the gap to fix nail/screw in cable clips. Would any of the following...
  11. N

    Kneeling Board For Attic?

    Im wondering if any body has used a kneeling board in attics. The kit I'm looking for was A kind of folding contraption like a mug holder for the wall. You could turn it into a kneeling board or push it narrow and it would become a walkway. First seen them maybe 8 years ago. Googles failed me...
  12. R

    Drilling hole in joints

    Hi all, I'm looking for just a little advise ... During my last test on Building Regulation (part P) / BS7671 / Guidance note 3 of my on-line course I find this question: Question 03: When drilling holes in joists, the maximum diameter of the hole must not exceed: A 0.25 x joist depth B...
  13. H

    Joist - free estimation/invoice app

    Anyone used joist? Stumbled on powered now a while ago but joist offers a similar functionality for free. Doesn't seem to be a catch, available for android and apple. Might be a handy addition to your toolbag for professional estimation on the go: https://www.joistapp.com
  14. S

    Bad day today :-( drilled a 20mm hole straight through top chord of a tji joist

    As above drilling from floor above I thought I was going through a 3x2 bracer but turned out it was the top chord of a tji joist! In all my years and knowing the golden rule ! Well I'd say id describe myself as devestated!
  15. 1Justin

    Posi-joist installation & cable support.

    I have a customer costing up a new build using steel herringbone composite timber/steel type "Posi-joists" for first floor and flat roof areas. I called up the joist manufacturer and was amazed to hear that no-one had EVER asked them about installing electrics between, and support thereof. He...
  16. G

    Installing bathroom fitting with no joist to fix to

    Hi, I've not been working much during the past 8 months, but have been asked to do a job for my parents. I'm changing out 6 downlights in the bathroom as they don't work very well and was going to change it for one ip44 rated bathroom light fitting which takes 1 es bulb. The fitting has a...
  17. G

    Bathroom light fitting with no joist to fix it to

    Hi, I'm changing out 6 downlights in the bathroom as they don't work very well and was going to change it for one ip44 rated bathroom light fitting which takes 1 es bulb. The fitting has a 32cm diameter approx, with a glass cover. However, when I took the downlights out, I noticed it was a...
  18. driverman

    domestic new build first fixing

    Hi Guys, I'm going to wire a completely new build house soon and I've been out of game for many years.The house has those Z joist which have timber top and bottom and hollow between, using metal Z frames for strength. My question is for those of you that come across this a lot is, When...
  19. N

    general building regulation

    Sorry guys just looking for a little help here, I done a homer for a joiner and I cut a notch out a load baring exterior wall and fitted a metal back box, the client is complaining and is trying to charge me, but I know that I'm aloud to notch up to 25% of the width of the stud and basically I'm...
  20. A

    Building regs, joist cutting?

    Had to go into an attic today to do a little work. Anyway, a new boiler was fitted a month ago, with 5 pipes running from one side of the attic to the other. To keep them level, the plumber has cut 5 holes through 2 ceiling joists, right in the middle of their 8 foot span. The joists are...

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