![]() ![]() ![]() There is a clear discrepancy between the roofers recommendation and AS3500. I also see there is a CSIRO method for shorter runs. Can anyone recommend, should I be engaging an engineer to make sure we get the right size gutters and downpipes/connection details or are roofers generally ok to do this sort of thing. ![]() Its all become a lot more complicated than I expected. The roofer thinks he is designing to HB 35 which is correct. We have a 70m2 catchment on each side of the house (rectangular roof, gable ends) with a 30 degree slope going into 1 downpipe. I decided to delve a little deeper and found that AS3500 actually goes into alot more detail than this and that in fact we need a much larger gutter and downpipe to comply with this standard. When I asked what size he was proposing the size he proposed for the gutter is 125mm high front quad. His response was that all you need is 1 downpipe per 90m2. ![]() As a last minute check I asked the roofer about whether he would be undertaking the calculations to make sure the replacement gutters and downpipes are the correct size. We have received a quote to replace the gutters at our place (as wella s replacement of metal roof to extension at the back) and had chosen someone for the work. ![]()
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