Browse Forums Owner Builder Forum 1 May 21, 2009 11:08 pm “It's just as unpleasant to get more than you bargain for as to get less” George Bernard Shaw. Re: Concrete questions. 4May 22, 2009 12:19 am “It's just as unpleasant to get more than you bargain for as to get less” George Bernard Shaw. Re: Concrete questions. 7May 22, 2009 10:25 am King willy Hi O.Bs I now understand not all concrete is the same. It’s not all grey stuff that pours out the back of the truck. It has different grades. Can anyone comment on the following? Ready mix concrete Strength of 20 mpa (is that strong) Standard for a waffle pod slab? Minimum slump of 80mm & max of 100mm. (I think that may be the thickness on top of the slab) Bulk pours at 15mpa. I need a bulk pour for footings is 15mpa OK. Trench mesh to be lapped at least 500mm with 20mm cover. (whats that) Fabric to be lapped a minimum of one full row. I’m doing a waffle pod slab by the way. Is it possible for a builder to skimp on mesh and concrete quality in the slab? The mesh I believe also comes in grades or thickness. Cheers KW.......... when you get your plans drawn up then get a slab design engineered... i think it cost me about $800, but im in the country and not alot of places to shop around! when they do it up they give you a report telling you what strength mesh, concrete etc, you dont need to guess it, itl be drawn up to aussie standards. every1 thats looked at our says its way over engineered, but atleast it should make it strong! bloody better with what i paid for my slab! Re: Concrete questions. 8May 22, 2009 10:50 am KW, Quote: Ready mix concrete Strength of 20 mpa (is that strong) Standard for a waffle pod slab? Minimum strength of concrete for slabs. I went 25 MPA Quote: Minimum slump of 80mm & max of 100mm. (I think that may be the thickness on top of the slab) Quote: Trench mesh to be lapped at least 500mm with 20mm cover. (whats that) Fabric to be lapped a minimum of one full row. All advice given by other posters is correct, slab design must be done or approved by a structural engineer. There're quite a few discussions on concrete and slabs on this forum, with plenty of advice, use the search to find them. And no, I'm no concrete expert, just an O-B badly burnt on the slab pour, who had to learn on his own errors. Chris My father rode a camel, I drive a car, my son flies in a jetliner, his son will ride a camel.Saudi saying Personally, considering your layout (study/work desks in bedrooms), I don't think you have any other option but to leave NW windows and make them as big as possible e.g.… 7 10538 We had this happen to us last year and got charged a variation. Try and give away as much as you can that is usable to charity otherwise if you are in Sydney I have a… 1 4533 |