Browse Forums Building A New House 1 Jul 03, 2011 3:12 pm Hi Guys, First time post here, but I have been lurking around reading all the great info some of the members can provide. I was wondering if anyone can help with this question I have. Basically our slab had been poured a week or so ago and I have just noticed that the internal plumbing for the shower waste must of been placed slightly in the wrong location. What the builder has done (from what I can see) is used a concrete saw to cut a 400x400mm square out to place a new pipe in the new location and connected it the existing pipe in the slab then just concrete around it, then they just cut down the existing PVC pipe and filled it with concrete. The locations of both the new and old pipe are in line with each other but the distance was wrong. Just wondering if the way that they have rectified the error is ok and in accordance with the building guidelines. Any help and advice will be greatly appreciated. I have pictures if taht would help Thanks Re: Slab and internal plumbing Question 2Jul 03, 2011 6:08 pm Exactly the same thing happened with our build - the shower waste was located in the wall! No fix yet but really interested to hear what should be done and what to look out for. I have an independent inspector on board so will be asking him as well. Re: Slab and internal plumbing Question 3Jul 03, 2011 8:10 pm Yeh can't imagine that ours would be the first for a mistake in the slab! I also can't see how else they can rectify it, besides pulling up the whole slab! ( if that happened I'm sure they won't be making anymore mistakes) Althom If you don't mind can you post what your inspector says about your situation? Thanks Re: Slab and internal plumbing Question 4Jul 03, 2011 11:40 pm My main concern with cutting out a 400x400 square is that the waterproofing plastic underneath the slab would be cut, an this would be difficult to seal again. Not sure how much of a problem it would be. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Slab and internal plumbing Question 5Jul 04, 2011 1:27 am Its a fairly common occurrence from what I've seen and the alterations were always done just as you described except for the added inclusion of a jackhammer. If done correctly there shouldn't be anything to worry about. Success is the result of good judgment, good judgment is the result of experience, and experience is often the result of bad judgment! Re: Slab and internal plumbing Question 7Jul 04, 2011 4:36 pm Lex But what about the reo that can start rusting?? (Or can it??) ... I thought that would be the main issue ... No there isn't any corrosion issue with the rebars. Certain chemicals contained in the cement mix create a type of protective film which forms on the surface of the steel making it much more resistant to corrosion than it otherwise would be. The main thing to be concerned with would be making sure the concrete is joined correctly. If the reo is cut or damaged in the works they should drill in some rebars in the existing slab. Success is the result of good judgment, good judgment is the result of experience, and experience is often the result of bad judgment! Re: Slab and internal plumbing Question 8Jul 04, 2011 4:37 pm If Reo is surrounded by concrete it doesn't rust. Also in this sort of location it is usually fairly dry which minimises rust. I know you are always interested in concrete issues Lex so...Did you know that its better that concrete REO is slightly rusty before the concrete is placed than shiny. It means any oil or grease is gone, the concrete grips the steel better and once the concrete is placed no further rusting occurs. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Slab and internal plumbing Question 9Jul 04, 2011 5:09 pm thanks guys with all your answers, it does reassure us some what. I have spoken to the ss and he has stated that the repair was all carried out in accordance to the regulations, also an supposedly engineer signed off the repairs (but off course we cant get a copy of that) and also pictures were sent to him(ss) prior to them filling the whole with concrete to make sure it was repaired correctly, rio drilled back in and plastic re-sealed and so on. (also we cant get copies of the photos of the repair either). Just wondering if the rio is not re-drilled back into the slab is there any chance, that overtime that section of concrete could sink or even rise a little? thanks again for all your responses. Re: Slab and internal plumbing Question 10Jul 04, 2011 5:43 pm biggie thanks guys with all your answers, it does reassure us some what. I have spoken to the ss and he has stated that the repair was all carried out in accordance to the regulations, also an supposedly engineer signed off the repairs (but off course we cant get a copy of that) and also pictures were sent to him(ss) prior to them filling the whole with concrete to make sure it was repaired correctly, rio drilled back in and plastic re-sealed and so on. (also we cant get copies of the photos of the repair either). Just wondering if the rio is not re-drilled back into the slab is there any chance, that overtime that section of concrete could sink or even rise a little? thanks again for all your responses. I've never seen or heard of anyone having any issues after this type of repair so I wouldn't worry too much considering its only a small hole. Although it would be nice for the ss to backup his claims because you still have your doubts. If he can't/wont send a copy to you he could always show you at your next site meeting . Success is the result of good judgment, good judgment is the result of experience, and experience is often the result of bad judgment! Re: Slab and internal plumbing Question 12Jul 04, 2011 5:59 pm Yes, thanks Bash, I actually did know that!!! (Yaaay!) I also know that reo must be completely surrounded by concrete in order not to rust, and there also must be a certain prescribed "cover", depending on where the reo is (side, top or bottom). So far so good But, I also know that reo should not be laying on the bottom of the trench on plastic, but ours is in once section, right at the start of the trench, abutting the house slab . The only consolation I have is that this location should be fairly dry, but not completely moisture free. So, I think I'd be watching for some spalling in the next few years . How is it possible that "experts" that know and do nothing else still make these basic errors, and I'm talking about people that have been doing nothing but concrete for 20 years. I give up. My signature is distracting people from my wise posts ... Re: Slab and internal plumbing Question 13Jul 04, 2011 8:41 pm biggie thanks guys with all your answers, it does reassure us some what. I have spoken to the ss and he has stated that the repair was all carried out in accordance to the regulations, also an supposedly engineer signed off the repairs (but off course we cant get a copy of that) and also pictures were sent to him(ss) prior to them filling the whole with concrete to make sure it was repaired correctly, rio drilled back in and plastic re-sealed and so on. (also we cant get copies of the photos of the repair either). Just wondering if the rio is not re-drilled back into the slab is there any chance, that overtime that section of concrete could sink or even rise a little? thanks again for all your responses. Is there is no documented evidence, it didn't happen. This is what auditors say when they audit our company. Demolition August 2009, Construction Started September 2009, Completed December 2010 Re: Slab and internal plumbing Question 14Jul 05, 2011 7:23 am ^ Biggie, I think there is a great chance of different subsidence if you cut a section out and replace it without anchoring the new section into the old slab. What's your slab type, is it waffle or raft, or ...? My signature is distracting people from my wise posts ... Re: Slab and internal plumbing Question 16Jul 16, 2011 2:31 pm This is our builders fix - build a wall over it and pretend it's not there! http://i1211.photobucket.com/albums/cc4 ... 160711.jpg If there have been changes, variations, during construction then the drawings should be revised, the building permit amended and the current, as built drawings given to… 2 4478 Thank you alexp79 and gommeqld for your advice, that's very helpful, thanks 3 7898 In my experience roof is essential element of the building envelope and hence a common property and should be covered by owners corporation however a detailed review of… 3 6163 |