Browse Forums Building A New House Re: Alfresco Drainage 11Sep 28, 2009 10:51 pm Our final plans say that our front porch (under roof) has a 25mm fall over approx 2.3m and our rear alfresco area (under roof) has a 40mm fall over approx 3.8m 2 6416 I would find out how deep your clay base is and depending on the depth install a cut off drain which is more than a normal agi drain. Where the neighbouring walls is… 2 3458 13 7118 |