Browse Forums Building Standards; Getting It Right! Re: NCC Volume 2 Rule 3.1.2.3 2Nov 04, 2016 12:08 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: NCC Volume 2 Rule 3.1.2.3 4Nov 05, 2016 2:02 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: NCC Volume 2 Rule 3.1.2.3 7Nov 05, 2016 11:16 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: NCC Volume 2 Rule 3.1.2.3 9Nov 05, 2016 1:35 pm An ag pipe cannot connect direct to the stormwater, there has to be a silt pit close to the stormwater junction. You need to check as to whether 100mm would allow you to do this. 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: NCC Volume 2 Rule 3.1.2.3 10Nov 05, 2016 7:50 pm Hmmm doesn't look like I'll get to do that...my weep holes and DPC are quite high I checked today which allows me to start to concrete a bit higher than the exposed Slab...maybe one brick higher than I wanted which will still give me >75mm clearance from the DPC and >150mm from the internal floors. Let's me slope as required without finishing below the base of the colourbond fence. Re: NCC Volume 2 Rule 3.1.2.3 12Nov 05, 2016 10:23 pm Are you planning on doing the concreting yourself? You seem to know more about the regulations than many concreters. It also appears that your slab and site cut was designed and laid with the appropriate heights which is not always the case. shanil86 Do you think some ableflex should be used between the building and the concrete pathway?? Absolutely. https://www.cornellengineers.com.au/all-about-abelflex/ 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: NCC Volume 2 Rule 3.1.2.3 14Aug 08, 2022 7:24 am [quote="SaveH2O"]The way that I have always read it is that 3.1.2.3 is the minimum and that the slope can vary greater than the minimum if deemed appropriate. The slab's footprint and the surrounding topography should be factored when the site cut and slab is engineered but this is not always done to satisfaction. Hi there, I have been reading through the BCA guidelines and I haven’t been able to confirm the required angle for an outdoor area on the ground floor slab that is covered by the 1st floor slab. The two sliding doors out to this area have built in drains so there will be no step, however I’d like to confirm if I still need a 50 or 100mm fall in the first metre of the covered area if this area is 5 metres deep or is it within the last metre closest to the edge? Thank you in advance!!!! Re: NCC Volume 2 Rule 3.1.2.3 15Aug 08, 2022 1:59 pm You could always commission alternative solution if you have trouble getting OC 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: NCC Volume 2 Rule 3.1.2.3 16Aug 12, 2022 5:35 pm trooper56 Hi all As you will have seen already on this forum this topic has been beaten with a stick over and over again. I draw your attention to rule 3.1.2.3 of the NCC Volume 2 which states: 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. However, in the explanatory notes, the following is stated: The appropriate slab height above finished ground level and the slope of the external finished surface surrounding the slab may vary depending on: 1. The local plumbing requirements; in particular the height of the overflow relief gully relative to drainage fittings and ground level (to work effectively they must be a minimum of 150 mm below the lowest sanitary fixture). 2. The run-off from storms, particularly in areas of high rainfall intensity, and the local topography. 3. The effect of excavation on a cut and fill site. 4. The possibility of flooding. 5. Termite risk management provisions. Does this mean that the rule is subject to the discretion of certifying authorities? I only have 1 metre on each side of my house available and I would not like to slope the concrete pathway 50mm from the edge of the home to the boundary. I am happy to place ample stormwater run-off channel drainage along the pathway. Keen to hear your thoughts and experiences/expertise. Cheers Shanil I Think what you are proposing is better than the standards as long as the plumbing is done by a professional and can cope with a heavy downfall. Just sloping the concrete away from the house either dumps it on the ground next to your paving or dumps it on your neighbour both can have consequences. thanks guys! yes this is how I've exactly raised it with the builder. still awaiting response. 12 6361 Whats in the gap between the fence and the concrete? I assume dirt/plants etc, right? like youve shown in other parts of the pics. Im not sure how familiar you are with… 8 6220 10 years ago was a different software than we use now. it has had a lot of changes over the past years. Improvments to the software and changes to how Nathers models need… 8 2393 |