Browse Forums General Discussion 1 Jun 03, 2010 8:01 pm I have a new home recently completed by a major project builder. When it rains moderately heavily (it hasn't teemed down yet) the guttering overflows in many places. We have the compulsory rainwater tank. Is it normal for homes with tanks that the gutter water can't drain away fast enough? It's not that the downpipes are blocked - they are draining. It seems to be they're just slow. Any advice would be appreciated. Re: Guttering overflows 2Jun 03, 2010 8:53 pm jassy Is it normal for homes with tanks that the gutter water can't drain away fast enough? No, that's not normal. I have had 3 tanks installed, they haven't caused my gutters to overflow. I'd say your problem is with the gutters, not the tanks - but you'll need someone who knows more than me to tell you any more than that! Building on an acre in Macedon ......one day. Re: Guttering overflows 3Jun 03, 2010 11:06 pm There can be two reasons for this (not the tank/s). One is not enough (or too small) downpipes. The other is that your guttering may not be sloping (falling) correctly. If there is a low spot in the gutter between the downpipes there will be a tendancy for an overflow to occur. Regards, Dennis Re: Guttering overflows 6Jun 04, 2010 9:03 pm Height difference, pipe diameter, roof area, etc are inter-related. I have 90mm pipes, approx 100 sqm going into the tank, and height difference of approx 45cm. My gutters have overflow slots that are only about 7cm above the bottom of the gutter. My gutters overflow during moderately heavy rain. Chris Yes, get a builder, make sure he is experienced and a registered building practitioner 5 9008 The two 15mm holes are obviously not compliant. The Dept of Fair Trading would love to see this one! Do the gutters pool water after it stops raining? Although it's… 4 8039 |