joists

  1. T

    Sistering Joists Treated or Untreated?

    Hi All, I have an old 1920's mid terrace property with a suspended timber floor on the ground level. There is a void (crawl space) of about 10 to 30 inches which is already quite drafty. The floor has sagged in places due to settling nothing structural so have decided to sister the joists and...
  2. B

    Deepening Joists

    Hi All, I need to deepen my 8x2s to ensure I have room for insulation as well as a service void. If I’m adding 2x2s to the bottom of the joists to give myself the extra room does it matter if I attach these parallel to the joists or should they run perpendicular? I have started running them...
  3. scimgx

    Does this look ok? (JG Speedfit)

    There was copper pipework in place previously (with a bathtub) and now, for a shower tray, basin etc, the pipework has had to go below the floor. Am not familiar with the reliability of speedfit and this is what the plumber installed. Is this ok? Would copper have been better? Also, the plumber...
  4. Tombling_Free

    Cutting Joist for Loft Hatch

    Hi - I've referred to this community so many times, but this is my first post myself. I am looking at putting a narrow staircase up into my loft. The joists run cross-wise to the staircase, so I am looking into cutting the joist to create the hatch. I'd be cutting right beside where the A frame...
  5. L

    Cracked Vertical Purlin Repair

    I'm in the process of buying a house and had a RICS survey conducted. The surveyor identified a crack in one of the Vertical purlins and said that it needed replacing. We asked the seller to get this repaired for us to proceed with the purchase and their contractor has repaired using resin...
  6. A

    Large holes through joists - advice please?

    A tradesman has drilled through joists for heating 22mm pipes. One joist looks particularly bad as I think they are too large holes as shown in photos. I need some advice to feel reassured if this is normal and can leave it as it is or if the joist needs some reinforcement with steel plates or...
  7. D

    Halving Joint for Joists

    This is a question I have more from curiosity than anything. But i was wondering if halving joints could be used in joists for a deck or shed frame. So basically build the outside frame then install the joists. But instead of nailing in short blocking pieces in between the joists as normal cut...
  8. sevenupcan

    Removing hearth from 1st floor bedroom

    I have a hearth on our first floor bedroom that I'm hoping to remove to I can pass a vent through it from below. We had the fireplace surround removed a few years ago, the chimney still remains. However while I was removing the concrete I discovered there are two small L beams positioned...
  9. A

    Composite Joists strength vs timber

    Hello I have a largish raised wooden joist and wood deck that needs replacing that I built 20 yrs ago. My plan (due to looks and price) is to put in a composite sub frame/joists (to reduce rot) and anti slip timber decking (already bought) I can’t seem to find out if composite is the...
  10. rajdsingh

    Sistering 2x7 joists, should I use 2x7 again?

    Hi all, I'm going to level my floor using sistering method and currently have 2x7 joists. Can I use 2x6 sistering joists? I was thinking of use screws, bolts and adhesive. Would appreciate any other advice as this is my first time doing this.
  11. N

    Joists on top of existing wall

    Hi I am upgrading the ceiling joists in my bungalow. They currently sit unattached on top of the wall plate i.e. there are no joist hangers and they are on top of the wall plate. Previously they only supported the ceiling plasterboard. I want a structural floor. I plan to use 150 by 47 C24...
  12. P

    Soundproof floor too heavy for third-floor flat?

    Hi all I'm going to soundproof my floor due to noisy downstairs neighbours. I live in a 120-year-old tenanment in Edinburgh, third floor, and now I've bought the materials and found how heavy they are I'm a tad worried about the eventual weight of the floor. I intend to remove the original...
  13. R

    Flooring Advice Needed

    Right, long story short our upstairs is floored with 18mm chipboard, with tongue and groove joints. Problems are: - the guy who owned the house before us did it himself, so nothing is glued, only screwed. It’s by no means the only job he absolutely sh*gged up. - multiple hatches have been cut...
  14. O

    How to level (lift) floor/joists with existing stud and brick walls?

    Hi everyone, my first post here! I have an old house where the front has settled lower than the rear, so the floor/joists are at an upwards angle from the front of the house > to an RSJ > to the rear of the house (after which is a newer extension on a concrete floor - so couldn't easily be...
  15. Chris_Munday

    Help please! Banging pipes

    I’ve recently had a whole new central heating system installed in my house. This consists of a new boiler, complete copper piping and radiators. The house was warmed by a warm air unit before. I have a problem when the heating comes on, all the pipes seem to make a knocking noise. Sure I saw...
  16. R

    What could be causing wet floor joists?

    Hi folks, Since we took up some floorboards a few weeks ago, three of our joists have been wet. We had the heating on and they did seem to be drying but we've not had the heating on much the past fortnight and had a lot of rain and they are very wet again, as well as the floor underneath...
  17. C

    Sistering 6"x2" Joists

    If I sister two or three 6"x2" joists, would this increase their span? I want to board out an attic with joist hung on joist hangers that over lap on a central wall. These are 4.8m joists, the overall span is 7m (with a wall in the middle). The longest stretch I have is about 4m which is...
  18. C

    Boarding Attic with fresh joists

    Hi All, I want to board out my attic. Will use 6x2 joists perpendicular to the existing ceiling joists. I am going to lift these joists up slightly and hang them to the walls. I will use 4.8m lengths and bolt them together in at the overhang. The span is 7m but there are stud walls/solid walls...
  19. E

    Joists and Wall Plate

    Hi, Is it ok to install flat roof joists between two old brick walls the following way? The wall plate would be resting on top of a 300mm wide brick wall. The joist size 175mm x 47mm x 2.4m span. The wall plate size is 45mm x 100mm.
  20. N

    Loft Conversion Joists

    Hi New here, great to have found this community and I hope someone can understand what is going on and give me a clue: When I lifted the plywood on our loft conversion to insulate and change flooring I found two sets of joists (8-10"): First set the old rafters running side to side Second set...
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