Browse Forums Paving & Concreting Re: Tipping fees when concreting 22Jul 10, 2011 6:59 am Aiah Highly reactive soil? Maybe they are actually following the Aus standards and excavating an extra 100mm in depth and rolling in cracker dust..... never seen it done on a residential place before. Just reading through this thread, many Qs are popping up .. When you say "rolling in cracker dust" - do you mean spreading crusher dust on the driveway/paths area and then running a bobcat to compact it? Do driveways need to be compacted first? What's the normal practice?? My signature is distracting people from my wise posts ... Re: Tipping fees when concreting 23Jul 10, 2011 7:01 am Pulpo I have used crusher dust for many slabs over the years. I have 3 big water tanks sitting on it. I find it easy to lay a smooth base for the plastic to rest on before the slab. I find road base too hard to work with for slabs. I have had problems with sand. What is the best "underlay" for driveways (or should I say, what is normally used)? I know what the theory (or some engineers) say, but what is used in practice and why and does it present any issues?? My signature is distracting people from my wise posts ... Re: Tipping fees when concreting 24Jul 12, 2011 7:19 pm Why is a base laid? If plastic used need a smooth level base. If no plastic and the ground is reasonably firm and level no need for any base. Seen plenty of concrete pour straight on the ground / dirt, but I almost always use plastic. Sometimes water the ground before as the water in the concrete is sucked into the earth. Crusher dust is my preference, cheap too. I have heard its meant for drainage and provides support for the slab but I have my doubts. Yes if the ground is a bog then the base provides drainage and support. Good Luck Pulpo Re: Tipping fees when concreting 25Jul 13, 2011 7:32 am Thanks for your reply, Pulpo. I've heard from engineers that a base is used to level the surface, so that the concrete stays approx. the same thickness. Some base materials can apparently actually present more of a problem, eg. non-compactible materials. I was told to stick to (real) roadbase, but have my doubts how many concretors actually use it . Same goes for plastic. One guy told me that he won't use it (under driveways) since it stuffs up the drying somehow (dries too slowly at the bottom where it sits on plastic). I am a bit surprised by that, since driveways are fairly thin concrete ... or are they not?? My signature is distracting people from my wise posts ... Is it just a report written to give to the bank initially and it is based on what and how your payments are made up for, or is it a full service where they go out and… 2 5720 0 21280 It will be neat but you won't have much freeboard. At least they are not weep holes. Are you in a high intensity rainfall region? The regulatory slope is only required… 3 8361 |