Internet Know How
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Everything posted by Internet Know How
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ok thats good to know. Would you say that mesh is not good enough for the slab and it should be 20mm rebar? I am waiting on some quotes for fixing. Any ideas what I should expect to pay going rate wise? For example is this type of job priced per m3 of concrete labour and materials. From others I have seen done similar to this, it looks about 8-10 weeks work starting with the hole ready dug out. I reckon 8 weeks no problem 5-6 men Appreciate your replies
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Yeah I will have a contractor come in and install. All I am doing up front is working with sika, formwork company and arranging other materials as needed. Check out the tables I just dropped into this thread too.
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Hey Ronan, I have pulled this table together from the SE rebar schedule. Slab is 137kg/m3, Basement walls 144.79kg/m3, Pool walls 133kg/m3 of concrete. Overall I am happy with the rebar in the walls, but for the base slab I just expected to see 2 layers of maybe A393 mesh, but even using 90 sheets that would be 6300kg sheet or 65kg/m3 of concrete....half what you suggested. A larger basement build nearby used 2 layers of mesh, but they didnt have a 2nd floor and they did install on sand.
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The pool is 10x3.5m. I am going to drop in some exact figures in a table shortly in response to your earlier comment buddy
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We will be at clay 4.8m down where the slab will be formed. For the walls we will use aluminium formwork. There is about £20k of steel in the base using the as is spec.
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The SE soecified some foam type boards to help with ground heave. This basement slab isnt the internal basement floor because we will have a 1m void across the entire footprint which was mainly to accommodate the pool area and avoid a split level slab. We will have UFH in the basement which will use celotex or similar
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Our basement walls will be 4.2m high, however we did start with 3m high walls and the Steel grading was the same. If you have done so much of this you clearly know the norm. Im no expert but it even jumped out at me
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Seems a common theme thar h16 are very much standard. Our basement walls will be 4.2m high
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I think he is just over specifying. The basement walls will hold inner leaf block and beam at ground level and outer leaf for facing brick work. Then on the 1st floor the block and beam will sit on the internal block work right up to 2nd floor. i agree that 16mm is ample for the walls and maybe 20mm starter bars for closing the perimeter walls to the base as you mentioned
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Hey Conor, its 650sqm over all floors. Slab is 240sqm, with 208sqm internal for basement and ground floor. 1st floor internal is about 144sqm and 100sqm 2nd floor i will ask him as you suggest as i feel the same amount of steel is fine, just reduce the grading and use mesh in the slab
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Hey, I am building a new home with basement. My structural engineer has specified a 400mm thick sl ab, and the slab reinforcement is 100% H20 rebar. This is to support a 5 bed property over ground, 1st, 2nd floor, meaning the basement walls are structural. I assumed that the slab would have been mainly made up of steel mesh, and H20 starter bars for the walls. Instead, over a 240m2 base there will be 8259 linear meters of H20 top and bottom. The wall starter bars are specified H25. Does this H20 and H25 sound overkill? £16k + vat worth of steel in the slab alone. If you know groundworks well, I would be interested in your thoughts Thanks
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Sounds reasonable, rather than someone just coming in and plucking any figure from the air
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Well yeah its especially valid where the VAT needs claiming back on materials and the firm is small who are laying the materials
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North West UK. Its not difficult to source top quality spanish slate, felt and batten. When running a full development you dont always want a trade to come in and purchase the materials, its not always necessary , especially when the hirer knows what he is doing
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What are the going rates for labour price per square meter to slate a new roof which is ready for felt and batten? All materials provided
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Yeah I agree its a good idea to protect the tanking, as I am sure I will have to purchase some other thin board otherwise. So I have 3 options overall to choose from and it all comes down to what is the best method of insulating and reducing the cold bridge whilst ensuring there is no sloppy looking termination detail around the base of the house
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tanking is going externally for this. There are some other images earlier in the post showing insulating options which is what I need to decide on.
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We could create this, but it is more work and the same as it sitting on the top of the wall. Maybe this below reduces any bridging..i dont really know
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The SE wants 10n blocks he said, so I have also added on a little for the extra scaffold too. The walls are going to be 300mm at the moment but he may push them up to 350mm if we use the concrete walls. That extra 50mm increases the concrete/sika mix by £2k So the trade off is the saving on not using the internal block work compared with the external insulation termination detail....plus I gain more space internally without the block, but it is a large house so wont notice it in the basement. And....extra space means more ££ on tiling as we have a large pool area to tile ICF...I have looked into it and I prefer the poured concrete. Not priced ICF though to be honest.
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My SE has said he is happy to progress using the blockwork as structural providing we use 140mm block. So I have 2 options available at this point 1.) Use blockwork internally for ground floor support, this means I have to install 210sqm or over 2000 block in the basement perimeter. unbroken insulation zone 2.) Use concrete formed walls as support, which means I do not have to use any block in the basement. Walls supported on 1st floor from internal block. Insulate basement externally I am tied between the two options because option 1 will cost me £10k more minimum in block and labour. We have standing water according to SI report at 1.5m so not sure if insulating externally is the best option either.
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100% agree and in this case we have other SE opinion who said although a steel frame will work fine, its not necessary
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Architect is saying professionally he cannot disagree, and the SE is in review again, however I can echo my thoughts after consulting with the builders and from what I am hearing there are really no issues building up off the block wall as per the Architects preference, and that's using a solid floor at first and timber on 2nd floor. If we go with the SE preference it means we do not require block internally in the basement or the internal insulation, so it would save about £10k materials and labour
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Its always going to be the SE isnt it
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I agree with you and this is what my Architect was telling him on the call too and the SE seemed more comfortable using the concrete wall so lets see what he comes back with later having done more work on the calcs. Maybe he is using software that makes is job easier and it brings out steel all times.
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thats great, thanks for providing this I will speak with my Architect about this design option
