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Found 5 results

  1. Hi everyone, I seen this forum when searching about raft foundations. Who knew how expensive they would be, I've been quoted £9k and £7.5k so far so I've looked at doing some myself and splitting it down to individual jobs, e.g pay a guy to dig it out, get someone in to show me how to build the metal work, get someone in to do the concrete. Obviously all checked at stages by building control. What are your thoughts on this people? Raft is 8.5m x 4m. 600 wide edging down to 1.2m, slab is 200. It's for a single storey extension on my house. Or if anyone is based in North East England give me a shout.
  2. Hi, I am just awaiting our ground survey and the plan is to go with an insulated raft assuming there isn't something stopping this. I have a quote from MBC for a frame and a raft. The frame cost is a little high as I expected, but not crazy. The raft price seems very high. I have not seen anyone actually quote how much an insulated raft foundation is costing them. We like the idea of MBC doing the whole shell, but I am just curious as to what would be considered a reasonable price. The quote is almost £250 per square metre of footprint. We would still have to do the groundworks on top of that. So people who have paid for or had quotes for an insulated raft, what kind of cost are you seeing?
  3. I have been gathering prices from the usual suspects (Kore, isoquick, Izodom) for my insulated raft foundation. I thought i was up to speed however Kore has just thrown me off a little with the engineering costs sheet they supplied. (See attached) and below for the two specific paragraphs. So when we are talking Kore type - insulated foundations, when is a ground bearing insulated foundation, not a insulated raft? Insulated Foundation Engineering costs (One off).pdf
  4. Greetings I am in the early stages of building a single storey oak framed outbuilding around 90m2. I intend to do everything myself to keep the cost down and as I have always wanted to build a cruck frame, indulge and try and enjoy the process. The ground has some clay content and is close to trees so I was thinking about going down the route of an insulated slab which doubles up as the envelope to form the raft. You may be familiar with passive house foundation stuff. The problem that I am finding is that despite being ‘just a large shed’, building control will need to be satisfied that structural calculations are done. To this end I have had some some quotes done and most are eye watering, or reasonable with the proviso I then spend a small fortune on a bespoke polystyrene system. Is anyone aware of any generic calcs for rafts (after all there are tables for timber beams!). Any help of any kind would be very welcome Cain assembly.pdf
  5. Im just planning how and where my soil pipes are going to poke up through my slab and I'm wondering what others have done for their 50mm waste connections. Always keen to save space and as I know where everything will go could I just have 50mm wastes poking up for every appliance and sink? If I use a strap boss from the soil pipe underground is this a bit stupid if it ever fails? Seems like it might have less chance of failure down there than surviving being beaten around by rebar and concrete. Either way can I get 50mm elbow into ducting? or is there no point even ducting the horizontals as the only wiggle room required will be horizontal..
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