slab

  1. U

    How to make a slurry from SBR and cement for porcelain tiles outdoors?

    Hi there, I'm using porcelain tiles in the garden. It's quite a 'wet' garden due to run off from the neighbours land so I want to ensure that my tiles are properly primed (I've read that it's crucial with porcelain tiles). I also read that you can use SBR and cement to make a slurry and just...
  2. U

    Porcelain slabs have lifted - what are my options?

    Hi all, I've just had half the garden fitted with porcelain slabs. The builder doing the work hasn't used any "slurry" primer (although he did say that he used a PVA primer) and a lot of them have lifted. Not sure if this is due to the frost over the last month or two? He did pop round and put...
  3. B

    Downstairs WC soil pipe through floor slab

    Hi all, We’d like a toilet downstairs, but there are some isues. Our drains are at the back and feed into the main sewer at the back of our garden, so the existing soil stack (and the new pipe) MUST be at the back (WC goes under the stairs). Unfortunately, our foundation is solid concrete all...
  4. T

    What sand for blinding on a concrete slab?

    Evening all, I'm installing insulation on my concrete slab ready for UFH and a 50mm liquid screed. I think I'll need to install a very thin sand blinding to flatten out the slab a bit, however I can't find anywhere what sand to use above concrete. I ask this because there is a DPM below the...
  5. L

    Can Steel concrete casing form part of floor slab?

    Hi, More for my understanding and planning right now, but my wraparound extention is set to have a box frame steel beam running below the floor (where the wall will come down), right down the middle of the room which will be encased in 100mm concrete. My question is, can the top of that...
  6. N

    Pouring slabs at different times - connect with rebar/helibar?

    Hi, First time post - go easy on me. I'm building a side-return extension on my victorian terrace which also requires the removal of two internal walls which divide the kitchen into 3 rooms. To keep the house functional and to save money, my plan is to work my way back from the end of the...
  7. M

    Lean - to foundations.

    Hi everyone. I've only just joined today so please bear with me as i may post in the wrong forum. I have a question. I intended to build a sloped polly cobonate roof between my existing bathroom( which spans half of my terraced house to the rear) and next doors lean-to/conservatory (this...
  8. George Hartshorn

    Should I break out the concrete slab in my flat? - help!

    I'm at a loss as to what decision I should make. I'm just in the process of buying a new lower ground floor flat in London which is approx 50sqm. Its been unoccupied for a few years and we will be renovating before we move in. In the late 80s the wooden floor was ripped out and replaced with a...
  9. H

    Concrete slab found under floor boards upstairs

    Hi. I need some advice on a concrete slab that I’ve recently found under the floor boards in my daughters bedroom on the first floor. It’s in the corner of the room adjacent to the two exterior walls (and coldest walls). I’ve always had issues with damp patches on these walls and very much in...
  10. J

    Improve ground floor thermal conductivity. Screed or subfloor?

    I`m doing a bit or renovation and I have 100mm of concrete sitting directly on soil. Removing it to poor a proper concrete and then 200mm insulation would have a massive cost impact and this is not feasible. I was thinking to poor 30mm or screed to level up all ground floor and then 18mm floor...
  11. D

    Screeding the shed

    Hey everyone! I am building a concrete block shed, or rarher two sharing one wall. Each one a bit smaller than 7x5 meters. I am about to pour foundation, 60cm deep, 30cm thick and take the blocks from there until i get a bit over the ground level. Next i will want to lay a concrete slab within...
  12. L

    Making floor for basement conversion (ed.)

    Hi, I did have an account on here a few years back but can't login.. So I'm converting our basement into the babies future playroom but I'm stuck on floor choice. My current substrate is the original brick type floor which was possibly laid when the house was built c.1870. My main goal is to...
  13. Shazad.m.

    Gravel sub base

    Hi All, currently trying to build a shed base/ paved area at rear of garden. Total area for the slabs is 5.4 sq m. I have dug down 11cm and started to now fill this with about 5cm coverage sub base which I made myself out of gravel ; bits of concrete and dry soil. However I have not got a hand...
  14. J

    1930s Floor issue. Seems very soft. How to make it stronger and lasting

    Hi, Just removed my old T&G plank and at the beginning I though that below I had a very strong Concrete flooring but this is not the case. I made few trial hole and the drill bits goes in like a soft cream and what come out is a black soil. the all flooring does not sound very strong and my...
  15. J

    Finish Floor, wood on top of slab, screed different level issue. Help

    Hi, I'm on the bit of renovation and found out after removing the carpet that my slab is in concrete with wood planks on top. I have removed some plank and some black paint seems to be on the slab. My question is because the living room has an extension and the level is 15mm different some...
  16. A

    Tarmac to Garage Slab Finishing

    Hello, I have a new build property with detached garage and tarmac drive (slopes down and away from garage door). I am looking at improving the finish of the tarmac to the slab on the garage. In short, the detached garage has a concrete slab which finishes inline with the brickwork. However...
  17. Ben-v

    Replacing floor joist with concrete slab

    Hi, My partner and I are having an extension on the back of our house and we would like UFH throughout the downstairs. Most UFH systems I have found aren’t the best for wooden floorboards and the floor height would raise substantially, so I was wondering about the feasibility of replacing the...
  18. N

    Suspended Concrete Slab - No Hardcore!?

    Morning We have just commenced the build of an orangery off the back of our property. The plan and quote was to have a 7m x 4m beam and block base with an air gap of around 150mm, so a fair bit of excavation. However when the builder turned up he suggested a slab as it worked better with the...
  19. C

    Bridging DPC to DPM

    During the build of our extension the builder built the walls (outer and inner) before laying the slab. This means the DPM does not go under the course of blocks containing the DPC. Is this a normal practice these days? There is also a gap between the end of DPM in places and the DPC, can this...
  20. S

    Can flooring be laid straight onto concrete slab?

    We've had to replace all the floors in our house, as part of a renovation. They have been constructed using 100mm insulation and there is UFH laid within new concrete slabs. However, there is no top screed, just the concrete slab itself on which to lay the final flooring. My concern is that the...
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