Browse Forums Building A New House 1 May 31, 2015 3:38 pm Spoon drain formed on outside edge of concrete apron around house slab. I tried to find the techniques that can be used by concreter to form spoon drain on the edge of concrete apron around house slab placed for slab protection. Any suggestions? I intend to place 1m wide apron sloped away from house around my waffle pod slab for slab protection. I prefer to not spend more money using prefabricated spoon drains, just after technique to form on in concrete during apron construction. Edit. Found a tool online. Master Finish Rad 50 dish drain trowel for about $30. Re: forming spoon drain 2Jun 01, 2015 11:32 am The only problem with trowels like that is that the sides are too steep and the concrete will want to keep slumping into the hollow depression you are trying to create for the drain. I've used similar before and just the nature of concrete means you will struggle to end up with a nice looking drain. You need a trowel with sides that slope at maybe 45º - even less if possible. The Master Finish 75mm radius coving or spoon drain trowel would be a better buy than the 50mm radius in my opinion seen here on page 9 http://www.masterfinish.com.au/catalogu ... alogue.pdf A concreter that used to do some work for us was an English guy and some of the tools he used were not available here - one of which I described above with the shallow sides. Stewie Re: forming spoon drain 4Jun 02, 2015 8:26 pm I am thinking an apron edge drain using 75 radius trowel to from spoon drain and some of these along the drain running into the storm water and out to LPD. https://www.masters.com.au/product/1001 ... rate-100mm Re: forming spoon drain 5Jun 02, 2015 10:33 pm Maybe where you are but around here most of the local councils will require a grated drainage sump ( usually 400 x 400 x 400mm deep ) to trap sediment before it discharges the water into the councils system particularly seeing as you will be directing water from your land. Stewie Re: forming spoon drain 8Jun 03, 2015 8:39 am I'm unsure of your local council regs but ours are pretty strict on it - maybe because we are so close to the coast. You only have to look at some of the big stormwater drains emptying into the sea around here when it really hoses down to see how much silty water is being discharged. For days afterwards the ocean will be a lot murkier than usual. Most of the time you'd be right in that there would be minimal or no sediment being washed off your path or any other concrete around your house when it rains but maybe not in a big downpour. As I say council regs differ a lot so just check with yours to see if there is any requirement. Stewie Re: forming spoon drain 9Jun 03, 2015 10:50 am Thanks Stewie, I will do exactly that and check with Council. I have advised the builders of my apron intention along with the associated spoon drain for them to consider as they engineer and draw up the drainage proposals for the site and engineer the slab. I will see what they come up with. Thanks again. Yeah mine about 9 metres long and 8 wide with slope of 25% at one point but the end point of the outlet is past the side of garage and if he concretes allowing for… 4 4517 Agreed. I just found out today the certifier has not given the final sign off. 2 4072 Grab a hose, insert it at the top of the inlet/down pipe and turn the water on and see where the water is escaping from. Then you'll know. 3 8454 |