Browse Forums Building A New House Re: Waffle slabs, slab heave and site drainage 8Dec 13, 2021 10:07 am actually in hindsight i think i know the answer to this. The services will be bedded in appropriate material regardless of the trench back fill and its the "ends" of those trenchecs at the slab edge if you will, that need the clay plug Dark matter scientist, can breathe underwater, mind reader and can freeze matter just by willing it. Trust me, its in my sig. Re: Waffle slabs, slab heave and site drainage 9Dec 27, 2021 9:43 am On highly reactive site they should back fill with clay. one issue that does come up in slab heave cases is the pipe trench is dug flat or even sloping towards the house and then gravels are used to get the correct slope away from the house.This doesn't work and can cause slab heave especially for the sewer trench at the rear of the house as watering the backyard lawn can be directed water under the slab. Another issue apart from not using clay plugs is flexible plumbing joints which are really done although required by AS2870. Re: Waffle slabs, slab heave and site drainage 10Dec 27, 2021 11:57 am groundzero Another issue apart from not using clay plugs is flexible plumbing joints which are really done although required by AS2870. According to the Victorian Building Authority and other industry groups, they are not required as the slab comes under building regs but flexible joints come under plumbing. To wit, a representative from Storm Plastics was shot down when he said they were mandatory during a meeting attended by the VBA and other building bodies a couple of years ago. Unfortunately, rather than advocate correction to regulatory shortcomings and ambiguities, many regulatory bodies adopt laissez-faire doctrines. 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: Waffle slabs, slab heave and site drainage 11Dec 27, 2021 12:27 pm AS 2870—2011
Re: Waffle slabs, slab heave and site drainage 12Dec 27, 2021 1:22 pm According to the VBA, it depends on what is referenced. If the slab is referenced, then external plumbing does not apply. I'll contact Storm Plastics in the new year and ask what their recollection of reasoning is. 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: Waffle slabs, slab heave and site drainage 13Dec 27, 2021 4:46 pm What do they mean by referenced ? When your at VCAT it doesn't matter what the VBA say if the builder hasn't complied with AS2870 then they haven't fulfilled their contract obligations. It is one of many things the VBA let happen in the building industry that don't comply with the Australian standards. Re: Waffle slabs, slab heave and site drainage 14Dec 27, 2021 6:07 pm groundzero What do they mean by referenced ? When your at VCAT it doesn't matter what the VBA say if the builder hasn't complied with AS2870 then they haven't fulfilled their contract obligations. Australian Standards are only law if they have been legislated or written in a contract. The VBA person was adamant when he said that when the slab is referenced, only the buildingcode applies, not the plumbing code. I'm pretty sure the VBA person I spoke to referenced an ABCB meeting he attended as the VBA representative when the Storm Plastics representative was deemed wrong after claiming flexible joints were compulsory use when building on reactive soils. I had asked for a written ruling on my Email query but the VBA don't like supplying them. I'll search my Email sent folder later to see if I still have the query I sent. Don't rely on V-CAT historic rulings, they have used unlegislated and outdated Guides as references in the past and only got away with it because industry 'experts' were none the wiser. The same happened in NSW but it was falsely denied when the question re the use of an unlegislated handbook was put to the NSW parliament several years ago. I'll investigate again in the new year. 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: Waffle slabs, slab heave and site drainage 15Dec 27, 2021 6:29 pm SaveH2O Australian Standards are only law if they have been legislated or written in a contract. That is also my understanding, specific codes, alternate solution's, etc must be referenced in the contract documents. If it's non compliant then the builder is to guarantee the work for the specified warranty time ie structural 6 years. Its bad luck if it falls apart after then, but best to bring the non compliance and subsequent effects to the builders attention ASAP. Build a solid case based on facts, data/proofs and put the builder on notice. Start with non compliant -> Not fit for purpose -> Followed by negligence. But get legal advice Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Waffle slabs, slab heave and site drainage 16Dec 27, 2021 7:39 pm StructuralBIMGuy SaveH2O Australian Standards are only law if they have been legislated or written in a contract. That is also my understanding, specific codes, alternate solution's, etc must be referenced in the contract documents. My NCC Part 2 (which hasn't been amended as far as I know) only states that a footing or slab must be constructed in accordance with AS 2870. As per the above and that stated by StructuralBIMGuy, no plumbing provisions external to the slab that are contained within AS 2870 apply as they are not referenced in either Parts 2 (BCA) or 3 (PCA) of the NCC but would apply if they were referenced in the contract. This is my understanding as explained to me by the VBA and my interpretation of the text from the NCC Part 2 3.2.0 (a) pasted below . "Acceptable Construction Manuals 3.2.0 Application Performance Requirements P2.1.1 and P2.2.3 are satisfied for footings and slabs if they are installed in accordance with one of the following: (a)The footing or slab is constructed in accordance with AS 2870. (b)Piled footings are designed in accordance with AS 2159. Explanatory information: Composite construction — design requirements for other materials State and Territory Variations In New South Wales delete 3.2.0(a) and insert NSW 3.2.0(a) as follows: (a)The footing or slab is constructed in accordance with AS 2870 except that for the purposes of Clause 5.3.3.1 of AS 2870 a damp-proofing membrane is required to be provided." 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. The Soil classification has little to do with piers. The purpose of the classing of the soil is to identify the clay content and the "average expected range of movement… 2 9859 13 6632 my suspicion - some builders, they do usually make 'odd' settings in their site plan / pricing as their standards - being hopeful that first - the initial price is… 9 2505 |