Browse Forums Owner Builder Forum Re: Roof Plumbing Plan 2Mar 01, 2014 11:48 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: Roof Plumbing Plan 5Mar 02, 2014 2:32 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: Roof Plumbing Plan 8Mar 03, 2014 3:15 am 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: Roof Plumbing Plan 9Mar 03, 2014 12:18 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: Roof Plumbing Plan 12Mar 09, 2014 4:36 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: Roof Plumbing Plan 14May 02, 2014 11:33 am Hi akapacker, Just to let you know the spreader bars are a great idea as I often see the asphalt shingles deteriorate prematurely where the water off the main roof is let to run off the roof below. However, the MOST IMPORTANT thing is to use the best underlay. IKO Roof guard premium synthetic underlay will last a lifetime. Even if the shingles start to deteriorate the underlay will stop any water from entering. We have stopped using the asphalt saturated felt paper because it breaks down easily and can leak. It is just PAPER with an asphalt saturant coating. It is worse in the areas where water builds up. If your whole roof is covered in the synthetic underlay and the valleys are lined with IKO Armourguard rubberised membrane you will never have a problem. I am replacing a block of ten units where no underlay was used on a 10 degree pitch - huge mistake. Low slope roofs need "Rubberised Membrane" between 8.5 and 18.5 degree pitch & valleys. All other areas need premium Synthetic underlay - like IKO Roof Guard synthetic underlay. Kind regards, Richard. Richard Larner - Asphalt Shingle Roofing Expert. Supplying DIY roofing advise tailored to Australia's unique conditions. Re: Roof Plumbing Plan 15May 10, 2014 1:01 pm I've been reading this thread with interest as I'm in the process of doing the same as akapacker and have worked out my downpipes pretty much the same. One thing I am confused with though is the slope factor. Any of the slope or pitch factor charts I have seen say that a roof with a pitch of 25º has a slope factor of 1.103 not 1.23 ? I'm about to work out the slope factor for my roof which is 15º and accordingly the SF should be 1.036 or is this the wrong figure ? I thought it was as simple to work out your actual roof area by multiplying the plan area x the SF. What am I missing here ? Stewie Re: Roof Plumbing Plan 16May 10, 2014 1:11 pm Stewie D One thing I am confused with though is the slope factor. Any of the slope or pitch factor charts I have seen say that a roof with a pitch of 25º has a slope factor of 1.103 not 1.23 ? Hi Stewie, AS/NZS 3500.3:2003 Section 3, table 3.2 is my reference for eaves gutter roof area factoring. 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: Roof Plumbing Plan 17May 10, 2014 2:34 pm The former Victorian Plumbing Industry Commission (PIC), now incorporated into the new Victorian Building Authority (VBA), had a technical solution sheet that explained the factoring by example. It now simply refers to AS/NZS 3500.3 and HB114...a handbook! Go figure!!! I checked the NSW Office of Fair Trading website and they now also use the 'upgraded' technical solution sheet. http://www.pic.vic.gov.au/__data/assets ... water3.pdf Nevertheless, if you calculate the roof plan area, you will find that it is 185 sq m (two areas of 10 x 15 & 5 x 7). If you then add up the catchment areas shown, they total 222 sq m. The roof pitch is still stated in the linked document as 23 degrees. This is factored by 1.21 as per AS/NZS 3500.3 (calculation example no longer shown on technical solution sheet) but the doc still states that the maximum roof area drained to the indicated gutter's cross sectional area and downpipe size is 47 sq m. Given that the average of the 5 roof catchment areas shown is 44.4 sq m, you can see that the 23 degree roof pitch shown in the example has had a factoring of 1.21. 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: Roof Plumbing Plan 19May 10, 2014 3:17 pm Stewie D Aha ! 15º Roof slope factor = 1.13 Correct. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. 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 6191 For anyone that comes across this issue in the future - Just did what aussieta said and found a plumber to inspect it and sign off on it. Was difficult to find someone to… 3 7067 5 3790 |