Q. Our house has gutters that pool water. We understand the regulations state that gutters must slope towards the downpipes but the builder has said that the gutters were installed correctly and are compliant. What can we do?
A. Slab movement and settling can alter a gutter’s slope. The best precaution is to install gutters on new homes with more slope than the required minimum. This often requires no more than one extra downpipe.
Regardless of this, water pooling in a gutter up to a depth of 10 mm for three days is deemed acceptable!
See 7.03 in the following link: http://www.buildingcommission.com.au/__data/assets/pdf_file/0009/6759/S_T_GUIDE_07.pdf