Browse Forums Building Standards; Getting It Right! 1 Nov 10, 2018 3:30 pm Hi, based in Victoria, wondering if any knows the plumbing standards for down pipes, how deep they should be, should they be sealed (usually see blue colour sealer) as you can see they are just less than an inch below the ground, not sealed. Also im now concerned if they done the same for the waste under the slab, not sealed etc.. any way to check? Thanks Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Plumbing query / standard 2Nov 10, 2018 7:16 pm Coverage depth depends on the type of finished surface. Did you discuss your intended finished surface with your SS? Single dwelling: No pavement and not subject to vehicular loading...minimum 100mm cover. With pavement of brick or unreinforced concrete...minimum 50mm below the underside of the pavement. There must however also be a minimum gap between the Damp Proof Course (at the bottom of the weep holes) and the finished surface. For Victoria as per The Building Code of Australia (BCA) Part 2 2016 which is Part 2 of the 3 Part National Construction Code (NCC) refers to AS3700 and AS4773. "The height of a DPC, or flashing serving as a DPC must be not less than— (i) 150 mm above the adjacent ground level; or (ii) 75 mm above the finished surface level of adjacent paved, concreted or landscaped areas that slope away from the wall". Sometimes plumbers are compromised by the site levels not being conducive with the stormwater pipe's required minimmum 1:100 slope (which indicates a more general design problem) and so plumbers need to lay the pipes higher near the downpipes so that they can attain the minimum drainage slope. This mostly goes unnoticed. Also check for blow out under the pipe. The downpipes should not be sealed at the adapter as this opening gives the water an outlet should the stormwater system surcharge during a major storm event or if the sub surface pipes should ever block due to ground movement or tree root invasion etc. The alternative would be for the water to back up into the gutters. If you are questioning as to whether the pipes have been solvent welded; Type N (unpressurised) solvent cement and the primer also comes in clear, it is not always blue (or red primer). Visible "blue" solvent cement is just a sign of sloppy workmanship (which unfortunately is quite common and even expected) and excess solvent outside of a melded area weakens the pipe and/or fitting. It would be unthinkable for a plumber to have not melded the pipes with solvent cement although many take the shortcut of not using primer.....which is also poor workmanship. 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: Plumbing query / standard 3Nov 13, 2018 2:58 pm Many thanks for the reply, however they were advised this is a charged system for rain water tanks above ground at the start of the build, and appears the pipes move around so not sealed. This is what the other 8 down pipes look like. This is the workmanship to date. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Been over 5 months like this. Caused much damage to slab? Re: Plumbing query / standard 4Nov 13, 2018 5:45 pm That is not a charged system and you do not use metal downpipes on a charged system. Have the downpipes been draining next to the foundations??? What is your soil classification? Not reactive I hope! Re the pipes "moving around", the plumber's behaviour is strange to put it lightly. Someone has stuffed up but has refused to own it. 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: Plumbing query / standard 5Nov 13, 2018 6:24 pm Yes the down pipes have have all gone under the slab, between the vapour barrier and slab too. Yes I was advised round pipes for charged system but hasn’t happened. Also the site is cut and fill on Class P due to clay soil. Just slab on ground no piers. Any way to test the pipes under the slab to check if they installed the swivel joint or sealed correctly. Re: Plumbing query / standard 6Nov 19, 2018 10:28 pm http://www.vba.vic.gov.au/__data/assets ... -Tanks.pdf Your engineering drawings will tell you which of your downpipes are charged so should have the suitable downpipes. Save H20 - in your experience would CCTV pipe inspection allow swivel joints to be seen the n pipes under the slab. Re: Plumbing query / standard 7Nov 20, 2018 7:28 am simonsss Yes the down pipes have have all gone under the slab, between the vapour barrier and slab too. Yes I was advised round pipes for charged system but hasn’t happened. The photos don't show downpipes going under the slab. The pipes in the photos are not charged and the rectangular downpipes also appear to be metal. You haven't indicated otherwise. The opening post said nothing about charged pipes, how many were charged or whether the pipes in the photos were suppose to be charged. You need to address your concerns to your builder and private building consultant if you have one and they will refer to the plans and applicable regulations covered by the Australian Standards. 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: Plumbing query / standard 8Nov 20, 2018 5:41 pm simonsss Many thanks for the reply, however they were advised this is a charged system for rain water tanks above ground at the start of the build, and appears the pipes move around so not sealed. This is what the other 8 down pipes look like. This is the workmanship to date. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Been over 5 months like this. Caused much damage to slab? Yes it will cause slab heave,that is not good enough. Looks like you are in Rockbank,Melton or Cobblebank? 2 7427 There is no reason why building contract reconciliation cannot be done prior to handover, if the builder won't do it get someone to do it for you. Why would you pay for… 3 7094 You might want someone to check your vinyl, the red of the floor and the way the vinyl has torn, it would be the right age to be asbestos vinyl. The moisture is an issue,… 1 1149 |