Browse Forums Building Standards; Getting It Right! Re: Downpipe Compliance - general discussion 61May 24, 2015 9:39 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: Downpipe Compliance - general discussion 73Aug 12, 2015 4:19 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: Downpipe Compliance - general discussion 79Aug 12, 2015 7:51 pm tom_air Trying to work out if my downpipes are compliant. I'm using the same builder as Goody I think, so I dare say mine won't be compliant either... How do you work out how much of the roof area each downpipe is draining? Is it possible to work it out based on the plans? Here is the plan showing my downpipe locations: https://dl.dropboxusercontent.com/spa/7 ... v07d7k.png Is that 7 downpipes? What is roof pitch? metal or tiles for roof? Do you have eaves? Save H20 has calculated that my roof drainage in non compliant. I would require a quad gutter with a cross sectional area of 6,000sq mm for my roof drainage to be compliant. I am on a H2 site too so that makes it even more important to have a roof drainage compliant roof. Re: Downpipe Compliance - general discussion 80Aug 12, 2015 8:25 pm goody59 So what I take from that is that my 7 downpipes to be compliant will only drain by design to be compliant 37 sq m each. A shortfall for me of 2.3 sq m per downpipe so multiply that by 7 is 16.1 sq metres short fall for my roof drainage. Have I got that right SaveH20? Yes...but the figures aren't exact because I didn't know the exact roof area...but the drainage will come up short because the figures will be close and the discrepancy is large. The calculations factor the maximum roof area that can drain to each downpipe, it is not the average drained to each downpipe because downpipes invariably drain different size roof areas. Your builder will (if willing) be able to tell you the roof space area and the roof catchment (factored) area. If you return to fzxbeetle's opening post on this thread, you will see that he has posted his roof areas as given to him by his builder. Note that the builder (Henley) were wrong with their drainage calculations as per those figures because they basically didn't have a clue. The VBA technical solution sheet 0.04 that I have linked below also discusses roof drainage compliance with an example. Note that the technical solution sheet is a re-vamp of a former Victorian Building Commission technical solution sheet but it is a poor attempt...some things like the roof slope factoring isn't properly addressed and they have even left a downpipe off the last house diagram on page 6! Good on 'em. I give it a 4/10. http://www.vba.vic.gov.au/__data/assets ... mwater.pdf 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Building Standards; Getting It Right! It's all good. You can get both wye piece and the coupling with or without thread. The cost difference is negligible and means the plumber only has to carry the single… 1 5211 Hi Sillysausage1900, Hope all is well. I came across this forum as Im somewhat same situation with you regarding Roof Plumbing certificate requirement. Im requesting a… 4 9398 |