Browse Forums Building A New House Re: Custom Double Story Home Downpipe 2Jul 11, 2021 8:22 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: Custom Double Story Home Downpipe 3Jul 11, 2021 8:54 pm Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Custom Double Story Home Downpipe 5Jul 11, 2021 9:21 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: Custom Double Story Home Downpipe 6Jul 11, 2021 10:20 pm I take it that the lower gutter will have one downpipe in the middle and the others at the ends. Having the straight gutter run gives the best efficiency. If you are close to Sydney metro, your 1:20 ARI will be about 200 mm/hr which is based on a 5 minute rain intensity average of 3.33 mm/min but the more regional Intensity Frequency Duration (IFD) is becoming more regularly used now. Without knowing the method used and the figure, I can still give you a ball park guesstimated answer provided I know the gutter's cross sectional area and the downpipe size because I would doubt that your regional 1:20 rain intensity would exceed 3.33 mm/min.. The gutter's cross sectional area is the critical one as I am sure that the downpipes would be least 90mm round which are sufficient. You can download the National Construction Code for free. The Building Code of Australia comprises Parts 1 & 2 of the NCC and the Part 2 roof stormwater drainage regulations are found at 3.5. The tables are easy to understand, you just cross reference the design rainfall intensity to the roof catchment area applicable (the factored roof slope allows for wind driven rain and is larger than the roof space area) and then cross reference against the gutter and downpipe size. Your roof slope should slot your factored roof area into the 60 sq m column serving each downpipe but this would still require a rectangular gutter cross sectional area a minimum of 7,900 sq mm or a 150 mm D gutter with a minimum 9,000 sq mm. Knowing your ARI/IFD intensities, the roof slope and the gutter size are critical to being able to give a proper answer. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. We bought land in Tallawong Schofields NSW size 30m X 12.5m and planning to get double story house build around 350 sqm. We are thinking about having premium inclusions… 0 4099 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 4933 |