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Internet Know How

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  1. Hi Ronan, what are your thoughts if we were to put 2 pumping wagons on this and 4 concrete wagons serving them half and half of the diagram I shared? We pumped a 97m3 slab last week with one pumping wagon and 3 concrete wagons on rotation in 5 hours start to flat float finish on the slab. We would probably need 6 men, 3 on each half, plus 2 guys moving the pump boom.
  2. What are the going rates these days for fixing slab rebar and wall rebar? H20, H16 mixture of straight, cut and bent. For the walls H25 starters, H20's and H16's. Is it generally priced per tonne or would a fixer estimate "x" number of days and apply his price? Thanks
  3. The video looks great, did you hire the time lapse camera or buy one?
  4. I'm no expert, I just think its better to have the one pour if possible. I do know of one other basement build who had walls at 2.7m high and probably 100m3 concrete pour...they did it in one with Sika. That doesn't mean my one will go smoothly though so I appreciate your knowledge and advice
  5. To pour the walls in one, or to not pour in one.....thats the question. We have a basement in the process of construction, and wondering if we should pour the walls in one or split it up into two pours. My installer has reservations about the potential of introducing cold joints if the concrete goes off too quickly before they get around to the next part of the pour to reduce the risk of any cold joints appearing in the walls due to concrete going off too quick. Although we have a construction joint where the wall meets the kicker, - outline plan of walls attached - basement wall height is 3410mm plus a 300mm reveal to the top - Sika waterproofing in the slab and wall concrete, using a c32/40 mix - Walls are to be constructed using H16-H20 rebar - Aluminium formwork panels will be used, panel height will be 3.9m, but the wall itself will pour as per above - Walls are 72 linear meters in total, and at 393mm thick we have about 100m3 to pour in the walls - We are in the water table - Will install a kicker, cast as part of the slab - We are using external sika tanking under the slab and down all walls - Pouring 1m section around the entire perimeter at a time, pokered, before going round for the next pass until the pour is complete. 1 perimeter pass will take 4 concrete wagons. In total in the 1 day we would need 13-16 wagon loads if each deploys 7.6m3. - The concrete yard is ten minutes down the road, and we can have multiple wagons on rotation. I personally want a single wall pour, and technically we meet the wall height to width pour ratios. I don't really like the idea of splitting the basement in half vertically for the pour and having sikaswell water bar up two sections of wall. What if there is ever any future movement, even slightly could open up a joint. I prefer a single pour, tied together completely with rebar. Would welcome your thoughts on this. Cheers
  6. Hi Russell, yeah I thought that could cause me some delays. To be honest, I would also expect that my brickie's would build accurately to the building regulations drawings which have all the sizes on there!
  7. I think it makes sense for the fabricator to do this and provide all the drawings too doesn't it, otherwise could end up being and expensive task to redo something if there are issues later where something does not fit.
  8. Thanks for the advice! I see what you mean by the thickness of insulation. The trade off for us is not digging any deeper to accommodate a 200-300mm insulation board. I have raised the use of the Eurothane sheet with my SE for input. We installed a water tank to capture all water run off, and we cast the tank in the ground with concrete so it will not move. Our slab is 400mm thick and our walls will be the same. We have some 25 tonnes of rebar going in as part of the basement build, which is mixed between 16 and 20mm bars.
  9. Yeah I will ask the SE to double check it, thanks!
  10. We did consider having a split level slab, so you are correct that whilst it has cost more to dig out, the engineering aspect putting back is a bit easier. the pool area takes up pretty much half of the basement footprint too. It's also made water management so much easier. As for the sump pump, not planning to have a pump running externally around the basement once we backfill, but we are having external tanking, sika in the concrete and maybe even an internal 3rd line of defence too...such as slurry to the walls or the internal drainage with sump pump
  11. Architect specified 150mm Recticel Eurothane® GP PIR board (thermal conductivity 0.22 W/m.K) or equal approved. im not sure on compressive strength of this
  12. Hey Conor, Swimming pool in basement, and slab is the bottom of the pool. It means we have a 1m void, then we install a block and beam floor which will have insulation, UFH pipes and screed. We are in the water table and its not possible to drain away water because the basement slab sits below the water table level. My view is that the insulation will be good for the pool area only to keep some heat of the pool water in, but wont offer much else. All other floors in the house have UFH and insulation under the screed. If I install 150mm or 200mm insulation across the entire underside of the slab, I then have to reduce my pool depth by this amount, which was planned at 1200mm (a standard depth). A 1m pool will work but isnt the best
  13. Hi Peter, Our basement slab is also the pool base, but not the basement floor level. We have dig deeper to accommodate a pool in the basement, so at pool level we have insulation and underfloor heating across the entire basement floor. There is a 1 m void between the basement slab and the basement floor. Thanks
  14. My Architect has specified 150mm insulation beneath the entire basement slab, as well as 150mm on all external RC walls to the basement. Is it typical to insulate under a basement slab or is this a complete waste of time? I understand having to insulate the walls, but the slab seems a little overkill. There are questions over whether the design will meet the SAP calculations if the under slab insulation is not included. Slab is 240sqm, so quite big, and with a pool in the basement we are going to insulate with 150mm under the slab where the pool is location which will take up some 80 SQM Your advice would be appreciated, thanks
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