Nearly all builders specify that they have an "M" slab included in their std package price.
But how many of you actually ended up with it?
I think it would be great if we could have a poll thread on what slab types people have.
Browse Forums General Discussion 1 Jan 25, 2015 12:28 pm Nearly all builders specify that they have an "M" slab included in their std package price. But how many of you actually ended up with it? I think it would be great if we could have a poll thread on what slab types people have. Re: Slab type 3Jan 25, 2015 5:33 pm M slab included as standard, site investigation came back with S. I asked to go with M regardless but the Engineers still designed the slab based on a S site. At least I have a conventional raft slab - it seems to be the waffles which are causing dramas Dale - Building Newbie Proserpine, QLD Re: Slab type 5Jan 25, 2015 5:50 pm bugbos What are the circumstances for using the different slab types, S, M, H1, H2? Flat blocks, sloping blocks etc....? And cost differences between them all Nothing to do with slope or anything, S, M etc refer to the soils reactivity - I.e. How much it will swell or shrink, basically how much it moves. Once you get above M, the bigger the chance of big slab cracks and slab heave if the slab has not been engineered properly. In other words, S, M, H2 etc refer to the soil movement/reactivity and the slab must be engineered to cope with the soil movement. If you get Class P, that means problem site, usually due to fill on the site or trees. If you have a big slope and highly reactive soil, site costs can easily get above 50k - even 100k is not unheard of. I am a bit hesitant when people say they have 15k site costs for a sloping, H2 site. Sort of screams out "under-engineered" to me! Dale - Building Newbie Proserpine, QLD Re: Slab type 6Jan 25, 2015 6:04 pm bugbos What are the circumstances for using the different slab types, S, M, H1, H2? Flat blocks, sloping blocks etc....? And cost differences between them all depends on the general reactivity of the site 1 non reactive =A(all sand or rock) 2 slightly reactive =S(clayey sand or minor clay) 3 moderately reactive =M-MD(moderate to deep non basalt clay) 4 highly reactive =H1-H1D(deep moderate clay or moderate amount of basalt clay) 5 highly reactive =H2-H2D(basalt clay) 6 extremely reactive =E-ED(very deep basalt clay) the D stands for deep profile. Problem site P =moderate to deep fill or abnormal moisture conditions on clay site(knock down/trees) Probably best to speak to a concreter or builder on this forum about different slab costs Re: Slab type 9Jan 25, 2015 6:40 pm dalemengel M slab included as standard, site investigation came back with S. I asked to go with M regardless but the Engineers still designed the slab based on a S site. At least I have a conventional raft slab - it seems to be the waffles which are causing dramas I'd be entirely comfortable having a waffle slab in my house on A, s or m soil. Even on H & P they are fine if the associated drainage is designed and implemented correctly however there is far less margin for error. Re: Slab type 10Jan 26, 2015 6:54 pm [/quote]If you have a big slope and highly reactive soil, site costs can easily get above 50k - even 100k is not unheard of. I am a bit hesitant when people say they have 15k site costs for a sloping, H2 site. Sort of screams out "under-engineered" to me![/quote] What are you talking about? Our site works were under 15k on a sloping block with H2 soil. Not sure what you mean by "under-engineered" when all it means is preparing the side for the slab. We have a raft slab designed and signed off by an "engineer". All depends if you wish to work with your block or go against it. Site works are not "engineered", its the prep work before foundations (slab,stumps,etc) are performed. Never argue with an idiot. They will only bring you down to their level and beat you with experience. George Carlin Re: Slab type 11Jan 31, 2015 6:27 am Engineering has a lot to do with statistics ie What is the chances of failure A, B, Or C ocurring Tell that to civil engineeer Chances are if you havent engineered & coupled siteworks, environmental conditions, structural elements,etc,etc you will have problems... Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab type 12Jan 31, 2015 7:23 am Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅
Our block looked like this - estimated fall 500mm from back to front and we are on H2 soil. Our raft slab cost us $21,200 for a 167 square metre weatherboard house with a colourbond roof. The builder told us that in the opinion of the tradies the slab had been "overengineered". Hopefully they didn't make any "adjustments" because considering the number of failed slabs in this area I would want my slab to be overengineered rather than underengineered. Re: Slab type 13Jan 31, 2015 11:00 am Liliana The builder told us that in the opinion of the tradies the slab had been "overengineered". On reading this, I immediately wondered why the builder would pass on the engineering opinions of site tradies to the new home buyer. To do so (I think) suggests that the builder has given greater credence to the tradies opinion than to those who engineered the design. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Slab type 14Jan 31, 2015 11:13 am Or just a convenient way to shift the blame for his own cost-cutting and incompetence. So far our builder has shifted the blame for not installing the water controllers to our hot water system on to the plumber; our defective service pipes are the fault of the building surveyor; the fact that our bracing doesn't conform to our engineering drawings is the fault of the framing company; Reece is to blame that we don't have the Rainbank which was in our contract and we are to blame for his mortar stains on our recycled bricks! Re: Slab type 15Jan 31, 2015 11:19 am Engineers dont generally get called in until it's too late and something goes terribly wrong. Under pier review it will be manys engineers opinions/calculations. I think you will find Building Commissions and Insurance Companies want to deal with engineering problems as they happen in situ, mitigate, and not wait. These are non compliance issues where Building Surveyors cant make the call.. Apps can play a part...HTH Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab type 16Jan 31, 2015 1:33 pm Liliana Or just a convenient way to shift the blame for his own cost-cutting and incompetence. So far our builder has shifted the blame for not installing the water controllers to our hot water system on to the plumber; our defective service pipes are the fault of the building surveyor; the fact that our bracing doesn't conform to our engineering drawings is the fault of the framing company; Reece is to blame that we don't have the Rainbank which was in our contract and we are to blame for his mortar stains on our recycled bricks! What was the problem with the bracing? Not enough supplied or the framing company over ruled the design? Re: Slab type 17Jan 31, 2015 1:36 pm StructuralBIMGuy Engineers dont generally get called in until it's too late and something goes terribly wrong. Under pier review it will be manys engineers opinions/calculations. I think you will find Building Commissions and Insurance Companies want to deal with engineering problems as they happen in situ, mitigate, and not wait. These are non compliance issues where Building Surveyors cant make the call.. Apps can play a part...HTH Not sure which area you speak of, but in QLD the designing engineer does the slab and footings inspections. Certifiers shy away from it claiming if there is a change to site conditions once works starts the engineer is the best person to assess it against their design Re: Slab type 20Jan 31, 2015 3:22 pm I'm not talking about metal angle or strap bracing. I'm talking about steel. http://www.powertruss.com.au/ Is this stronger than ply bracing? Natural stone tiles like slate, travertine, and limestone add a timeless, elegant look to… 0 24508 2 4181 Thanks for the insights, that makes perfect sense, and yeah, I will be leaning on the experience of the excavator operator entirely. 6 16138 |