Browse Forums Building Standards; Getting It Right! Re: Damp proof course 81Mar 01, 2014 1:57 pm 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: Damp proof course 83Mar 01, 2014 2:46 pm 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: Damp proof course 85Mar 01, 2014 3:04 pm 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: Damp proof course 87Mar 01, 2014 7:45 pm 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: Damp proof course 89Mar 05, 2014 10:23 am tezzab Example Quote: PVC Pipes to be sewer grade solvent cement joints but the plan shows and states Quote: 90 dia. PVC @ 1:100 I tried many searches for Sewer grade PVC but the only sewer type I can find is DWV, Drain Waste Vent, non pressure. No 90mm though, 80 dia or 100dia Sewer grade is DWV. It is not made in 90 mm but it is available in 80 mm, 100 mm and many other sizes. Stormwater pipe and DWV pipe are both available in 150 mm. He has confused his pipe references. Just to elaborate on the above posts... The 100 mm uPVC SN6 DWV pipe has an internal volume (8.53 litres per metre) that is about 46% greater than the common use 90 mm uPVC stormwater pipe with 1.8 or 1.9 mm walls and an internal volume of 5.84 litres per metre. This is because the 90 mm stormwater pipe has an internal diameter (ID) of 86.2 mm whereas the much stronger (3 mm thick walls) 100 mm SN6 DWV pipe has an ID of 104.2 mm. AS2200 requires the nominal diameter 100 mm uPVC DWV pipe to have a maximum flow rate of 450 lpm (which is 0.88 metres per second) whereas the flimsy nominal 90 mm uPVC stormwater pipe is mandated as 360 lpm (which is 1.03 metres per second). A bit strange one might say! http://www.dsdip.qld.gov.au/resources/n ... er/136.pdf When you do the calculations for pipes with a true 90 mm ID and a 100 mm ID, the respective internal volumes are 6.36 and 7.86 litres per metre.This in turn equates to respective flow rates of .94 and .95 metres per second when flowing at 360 and 450 litres per minute. Taking this further... If the 90 mm (86.2 ID) uPVC stormwater pipe was mandated for a maximum flow rate of .94 metres per second, the litres per minute flow rate would be 5.89 x .94 x 60 = 332 litres per minute, not 360! If the 100 mm (104.2 ID) uPVC SN6 DWV pipe was mandated for a maximum flow rate of .95 metres per second, the litres per minute flow rate would be 8.53 x .95 x 60 = 486 litres per minute, not 450! It is my opinion that the calculations for 90 mm ID and 100 mm ID uPVC pipe should not be transposed to nominal sized 90 mm uPVC stormwater pipe and 100 mm uPVC SN6 DWV pipe. The standards should, in my opinion, apply to the pipe's true ID and not their nominal ID, indicated as DN. The pipe's strength should also be taken into account. Farcical situations such as highlighted here where thin walled DN90 (actual ID is 86.2 mm) PVC stormwater pipe is understood to have a 17% higher velocity rating (1.03 metres per second) than the considerably stronger DN100 (actual ID is 104.2 mm) PVC DWV pipe (.88 metres per second) should never happen. 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: Damp proof course 90Mar 15, 2014 8:53 pm Liliana Note to everybody - take a photo showing land levels with a reference point during the build! I'm with you there! Our builder didn't want to fix something because "we must of changed the ground level" but if the ground level was where he reckoned it was then there was something else he should of done. He couldn't argue it, if the ground level was this he should of done A and if the ground level was that he should of done B, he was wrong either way. (But we didn't change the ground level.) Re: Damp proof course 91Sep 14, 2014 1:15 am Hi Liliana, Hope this topic is still going I think that good construction practice for a weatherboard house on a slab is as Ausdesign said to provide an underlay to the slab, best turned up the edge of the slab and a Rencourse or similar dampcourse or similar laid under the bottom plates of the timber walls and turned up behind the wall plus down over the upturned underlay to form a continuous damp-course flashing because there are these things called external doors and full height windows. However not long ago it seems that the Building Code of Australia (in its wisdom?) decided not to draw the situation of a weatherboard house on a slab. The same goes for wall tiles junction joints with fixtures and floor tiles and hobs which is why wall tile installations are almost always not in compliance with plasterboard and particleboard manufacturer requirements. Leonardo_23 Re: Damp proof course 92Sep 20, 2014 12:19 am Hi Liliana, Instead of upturned underlay I meant over the particleboard edge and further down past the bottom of the particleboard to avoid any capillary action. The underlay under the slab could be turned up to the ground level but is normally not required nowadays and stops at the inside of the edge beam. Re: Damp proof course 93Sep 20, 2014 11:23 am Hi Leonardo_23, I'm not sure what you mean by particleboard. Where would the particleboard be? The underlay is, I assume, the black plastic but that certainly wasn't upturned and covered by any Rencourse. Do you have any images of what Rencourse is? Re: Damp proof course 94Nov 21, 2014 11:14 am Thanks for this threat, Liliana, I just discover my drainage is another non compliant, 90mm instead of 100mm. stormwater pit in wrong location, also less than 1 metre from our slab. our plan said, min 1 metre distance. Lucky I still have one last bill to be paid.........Thanks guys...... Re: Damp proof course 95Nov 21, 2014 11:31 am Hi fzxbeetle, I'm glad the thread has been of some use to you. It always pays to read the boring technical details yourself and see if they have indeed been followed. And best to do it now before you have paid. Good on you. Re: Damp proof course 97Dec 29, 2021 7:42 pm Hi building-expert, I have been searching posts for a few days regarding ground levels, thankfully I have found this post! I’m having a similar issue. Is there a specific requirement regarding the ground level around the perimeter of the house at handover? What are your thoughts on the attached photo? Thanks in advance, Jemma building-expert I have lost the count on the number of times this appeared on my pre final inspection report. " Builder must reduce ground levels around dwelling to comply with BCA. Levels must be 150mm below DPC and slope a minimum of 50mm away from dwelling(for ground surfaces that are not landscaped)" Of course what happens is that excess soil from slab excavation is spread around dwelling raising levels too high to save on removal from site costs. Nice bonus for the builder if he gets away with it (not if I am around) and a major headache for the owner. If concrete contractor is on the ball he will tell owner that excavation is required to reduce levels before preparing for paving. Then owner pays again for what builder should have done. However reality is that many builders don't have BCA and next to none concretors have one . So you end up with a problem that Liliana described. In saying that I exclude many competent concrete contractors that are professional and know their job. You just have to be lucky to pick one. 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