block

  1. S

    Thin concrete blocks (40mm) as foundation pillars for a garden room

    Hi, I have a thick & reinforced hardstanding that is going to be used to build a garden room within the permitted development. It was originally intended as a brick garage years ago but was never built. The hardstanding is NOT coming up or being drilled out.... The sub-base for the garden room...
  2. W

    Reinforcing a purlin thats ready to go...good idea?

    Hello! I found this forum from other "purlin nightmare" threads which had really good ideas. The roof section in question is an extension around 3m wide (completed around 15y ago) which is partly separated from the main attic by the old gable end, the main roof is built using trusses in the...
  3. J

    Single skin block wall roof to wall runner an issue?

    I have a small outbuilding built around 10x10ft in single skin medium density block. I have a 4% pitch roof and want the high point of the beams to sit within the wall to keep the roof blocked from the close fencing as its within the boundary. So my idea was a wooden 2x5 wall plate (runner)...
  4. R

    Concrete Block Strength

    Hi All... Possibly a stupid question, but here goes - how much weight can a concrete block (7.3N) and a Thermalite or Fibotherm (3.6N) actually support before it crushes? Reason for asking is that I have 4m lintel (Catnic extra heavy duty) going in above some bi-fold doors - its a single...
  5. Mr.Mincer

    Cavity block piers

    Hi everyone. I've to build a cavity block wall 8 courses high & 11m long. The block Laying etc is no problem,my question is how do I do tidy piers? I could do 4" solids ,2 flat,2 upright but I think that will be very chunky. How can I put piers in the middle of the wall so both sides looks...
  6. B

    Blocked off Chimneys on Party Wall (Leave, Vent, or... ?)

    So, we have 3 chimney breasts that are blocked off and are on the party wall - they are all papered over and I presume plasterboard/wood or similar has been used to block the gap. These are not vented at the bottom, which I thought had to happen. (Please note that I'd prefer not to have a vent...
  7. T

    Rodding access for soil pipe in eaves

    I am installing a new bathroom which will have a 5.5m run of soil pipe from the toilet to the stack. I am planning to turn the pipe 45 degrees immediately after the toilet, then a first run of 1m, followed by another 45 degrees, then the remaining 4.5m to the stack. This will all be with...
  8. D

    Chocbox - do I need to provide access?

    When extending cables in the ceiling, with a connector block inside a chocbox, do I have to leave access to this new junction? Thank you Dain
  9. SS-ProjectBuild

    Concrete cavity fill (225mm below dpc) question?

    Hi Guys, I will be filling my cavity as per title over the weekend prior to backfilling and compacting the ground. I know i need to use 8 part balast to 1 part cement gfor the mix...but i have read conflicting messages about the consistency of the mix....should it be wet or dry? Also i have...
  10. SS-ProjectBuild

    Help with lintel size

    Hi Guys, going to be building up to DPC for my project this week. There will be 2 bridges for water and electric supplies to run under the blocks... what size/rating lintel will i need (assumng i need 4 lintels also)? Thanks
  11. D

    Blocking up ground floor internal doorway - does it need dpc? etc

    Single leaf breeze (not supporting). I dug a 100sq test hole in the ctr and found conc. below the screed so I figure using conc. blocks will be ok. Do internal walls require a dpc? I'm assuming it would be good practice to dig out a channel in the screed and block up off the concrete below...
  12. SS-ProjectBuild

    Concrete vs Ash vs Thermalite

    Hi All, Ive been advised by my builder to use concrete blocks fro my outer skin of my outbuilding and internal skin/partition walls with ashblocks/ashlite.... i cant find much information on these on the net...has anybody else come across these (or if there is a different term for them)? Ive...
  13. U

    Garden retaining wall, concrete block k-rend and cavity?

    Hi folks, I’ve done quite a bit of research but can’t find the exact answer to the exact question I have; do I need a cavity in a 2 skin concrete block wall to satisfy k-rend requirements? Background. I have had a 1.5m block retaining wall built and hope to k rend it (eventually after other...
  14. G

    Extension Brick/Block Work and Foundations

    Hi all, Embarking on a small extension on the back of the house. No knocking through required, just using existing window and door openings. I've spoken to BC for some of the technical info, and am intending on doing a chunk of the work myself as much as possible. My questions are as follows...
  15. T

    Block and beam into existing wall??

    I’m building a rear extension on my bungalow. The block and beam floor has been designed so that the beams run parallel with the rear facing wall. So i understand that usually if they were running perpendicular, the beams would key into the existing wall and be supported by the load bearing...
  16. D

    What size hole for 6x100 Easydrive concrete screws?

    Easydrive seem to be a bit shy of providing hole spec.. The 6x100 have 6mm thread diameter, slightly unsurprisingly (with 4.8mm shank). They're going in to a concrete blockwork wall. Is there a general rule for hole sizes? Thank you Dain
  17. S

    Suspended concrete garage floor

    After being let down by several structural engineers wondering if anyone on here will be able to help me. I purchased a new house 4 months ago and the garage is my next project. Water has been getting in for several years and it has rotted the existing suspended floor rendering it useless...
  18. B

    Toilet partially blocked?

    Can anyone help with a solution to a partially blocked toilet? This has never happened before and has only just started. Basically the toilet flushes fine, and maybe the fresh water after a flush takes a little longer to settle at the correct height. But after a few hours left alone, brown...
  19. acurachris

    Blockwork for windows and lintel

    Hi I am doing the block work on my extension and I'm wondering the best way to continue around the ground floor windows. I can run a full course of 75mm blocks on top of my wall now which leaves me at the correct height for the window and then the coursing is also correct for the lintel, or I...
  20. acurachris

    Council regulation over the top?

    Hi I am doing an extension and had a trial hole dug for the foundations which was to 1.4m (deep due to trying to find good ground - point 1 below). The water table was oily/contaminated and ground is obviously made up ground. My council building inspector came out and inspected the hole and...
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