Browse Forums Building A New House Re: Waffle Pod Slab with Piers 2May 27, 2019 6:15 pm Ideally, piers and footings should be connected via steel reinforcement and poured together. Alternatively, reinforcement steel can be chemi-anchored into the piers after they are poured and then footings and slab are poured on top. Re: Waffle Pod Slab with Piers 3May 27, 2019 7:35 pm Thanks Alex. My building inspector was thrown off by it. Said he had never heard or seen it done before. Mentioned the concreter wasn’t happy about doing it. All of which threw me off. I am waiting for the engineer to say it was planned that way and my inspector to confirm it’s common practice. I thought they would be seperate and stiffening the soil base not integral to the Slab. Re: Waffle Pod Slab with Piers 4May 27, 2019 7:40 pm If piers are connected with the footings via reinforcement then they will be preventing the slab from lifting up if to some reason the water gets under the slab and the soil under slab swells (piers will be holding the slab better via their friction with the soil). Otherwise, there is always a risk that swelling soil will lift the slab/footings and then they will just stay lifted as dirt and clay will get in between your piers and the footings and create unequal load bearing. Unfortunately, a lot of "common sense" and common global practice things are unheard of for the most of the construction related specialists in Australia. Re: Waffle Pod Slab with Piers 6May 27, 2019 10:08 pm insider It is uncommon to be poured as one.A good question to ask the builder is how did they do the plastic membrane ? I have witnessed plastic membrane to be generally installed under the slab but rarely into the footings. Piers generally go under the footings. And yes, as a matter of fact, composited structures (poured simultaneously, connected via reo and without construction joints) will always perform better. BTW, there are some modern and effective ways to waterproof concrete for life (eg by adding RadMyx into the concrete mix before the pour), so there will be no need to install neither DPC nor plastic membrane. Re: Waffle Pod Slab with Piers 7May 27, 2019 10:23 pm alexp79 insider It is uncommon to be poured as one.A good question to ask the builder is how did they do the plastic membrane ? I have witnessed plastic membrane to be generally installed under the slab but rarely into the footings. Piers generally go under the footings. And yes, as a matter of fact, composited structures (poured simultaneously, connected via reo and without construction joints) will always perform better. BTW, there are some modern and effective ways to waterproof concrete for life (eg by adding RadMyx into the concrete mix before the pour), so there will be no need to install neither DPC nor plastic membrane. except that it is required by AS2870. Piers are part of the footings Re: Waffle Pod Slab with Piers 8May 27, 2019 10:33 pm insider alexp79 insider It is uncommon to be poured as one.A good question to ask the builder is how did they do the plastic membrane ? I have witnessed plastic membrane to be generally installed under the slab but rarely into the footings. Piers generally go under the footings. And yes, as a matter of fact, composited structures (poured simultaneously, connected via reo and without construction joints) will always perform better. BTW, there are some modern and effective ways to waterproof concrete for life (eg by adding RadMyx into the concrete mix before the pour), so there will be no need to install neither DPC nor plastic membrane. except that it is required by AS2870. Piers are part of the footings Isn't it mandatory only in NSW and SA? Re: Waffle Pod Slab with Piers 9May 27, 2019 11:17 pm probably not mandatory here in Canberra, which is odd as I always thought Canberra had stricter regulation - one of the reasons builders site for their insane price here! either that or the certifiers are letting it go unchecked? I have observed a number of constructions recently, most of them piers first and then the wrap, form-work and slab - no contact between piers and slab.
Re: Waffle Pod Slab with Piers 10May 28, 2019 7:44 am Royce Should the piers be poured in situ with our slab on a P class site? Good Idea but rarely practised Royce There are four piers on one length of the block only. If you want a reply Here are some tips The better the info (ie.Photos, Contour survey, engineering slab plan,notes) you put up the better the answer BTW, it also helps others. The wpm can be penetrated and connector bars ie pier to beam are highly recommended This should be on your engineering detail/notes followed by stormwater considerations? Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Waffle Pod Slab with Piers 11May 28, 2019 8:41 am Royce Should the piers be poured in situ with our slab on a P class site? Or should they be separated from our slab? There are four piers on one length of the block only. I have done a lot of work on class P sites using both screw piles and concrete piers. They are always done separately in my experience and inspected by the engineer and certifier separately Simeon McGovern Affordable Custom Homes, We design and build to your budget Ashington Homes www.ashingtonhomes.com.au Re: Waffle Pod Slab with Piers 12May 28, 2019 9:45 am P class sites normally have a sub-classification and this would determine whether the piers are poured at the same time or separately. 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 9863 How good is Simeon?! Always taking time to help others out! Wish we were building in NSW and could work together. Thanks for all that you do! 7 6577 DIY, Home Maintenance & Repair That’s very helpful information. Will find out more from there. Much appreciated. 11 13455 |