Browse Forums Building Standards; Getting It Right! Re: Calculating slab height using RLs 30Jan 24, 2015 11:12 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: Calculating slab height using RLs 31Jan 26, 2015 10:29 pm Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Calculating slab height using RLs 36Feb 06, 2015 8:03 am Foremost Building Expert in Australia,assisting with building problems/disputes, building stage inspections,pre-contract review advice for peace of mind 200 blogs http://www.buildingexpert.net.au/blog Re: Calculating slab height using RLs 40Feb 16, 2015 6:08 pm Slab Heave Recipient SaveH2O building-expert Below is extract from NCC 2011 Volume Two Australian Building Codes Board 3.1.2.3 Surface water drainage Surface water must be diverted away from Class 1 buildings as follows: (a) Slab-on-ground — finished ground level adjacent to buildings: the external finished surface surrounding the slab must be drained to move surface water away from the building and graded to give a slope of not less than (see Figure 3.1.2.2)— (i) 25 mm over the first 1 m from the building in low rainfall intensity areas for surfaces that are reasonably impermeable (such as concrete or clay paving); or (ii) 50 mm over the first 1 m from the building in any other case.************* Hi BE, I have always thought that the slope must be 50 mm over the first metre for all class 1 buildings but when reading the above, this is an urban myth! What is defined as "low rainfall intensity"? The intensity would obviously also have to pertain to the region's ARI but which one, 1:10, 1:20, 1:50, 1:100 or one of the others that I haven't mentioned? In Melbourne for example, it says that the low rainfall intensity is to be calculated over a 20 year period for a 5 minute duration of rainfall. Close but no cigar. B-E answered my query not long after I posted it. A "low rainfall intensity" is a region where the 1:20 Average Recurrence Interval (ARI) is 120 mm/hr or less. The one hour figure is based on a 5 minute average rainfall intensity, for example, in a 120 mm/hr rainfall intensity area, total rainfall of 10 mm over a 5 minute period would qualify the storm as a 1:20 ARI. AS an aside, eaves gutter compliance is based on a 1:20 ARI and box gutter compliance is based on a 1:100 ARI. A 1:100 ARI has a 5 minute intensity that is approximately 50% greater than a 1:20 ARI. 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Broker here - legislation says that every true broker must put the clients best interests before theirs so in theory they must offer you the best options for you on their… 2 46013 0 2020 Unless the room is for storage then it's non compliant BCA V2 2019 S3 P3.8 You have 2 options 1. The builder deconstructs the section and rebuilds as per plan /… 7 10684 |