Browse Forums Building Standards; Getting It Right! Re: Piers\Footing poured at same time as slab? 2Aug 26, 2015 10:39 pm Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Piers\Footing poured at same time as slab? 8Aug 29, 2015 10:56 am insider Gunna Well I visited site. The boxing is done, waffle pods in place and the rio has been tied. Checking the perimeter and the holes for the piers are in place, so they have been dug at least and must of been done this morning as they were not there yesterday afternoon. So the piers have been poured? Ask if they were inspected and if they were can you see the documentation . Not poured. Just the holes dug. I called our independent inspector and he said it's sometimes done and is normal. I was just nervous as it was due to rain and they were boxing the slab. At the time I checked no pier holes had been dug. Re: Piers\Footing poured at same time as slab? 9Aug 29, 2015 11:50 am I don't think its normal and how are you going to keep bottoms of pier holes clean whilst working on top. Its a shortcut and I would not try it. I have seen two pier holes poured with slab but only because they were missed when the rest was done and building inspector allowed it. 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: Piers\Footing poured at same time as slab? 11Aug 31, 2015 1:55 pm So it would seem the bored the holes, laid the black membrane, reo, pods then more reo. They cut circles around the pier holes. Building inspector said they will get holes inspected, pour and then re-inspect. They will then lay some more membrane and then pour the slab. Said there will be some cure time before that last bit of membrane goes on though. Re: Piers\Footing poured at same time as slab? 12Aug 31, 2015 8:38 pm Gunna So it would seem the bored the holes, laid the black membrane, reo, pods then more reo. They cut circles around the pier holes. Building inspector said they will get holes inspected, pour and then re-inspect. They will then lay some more membrane and then pour the slab. Said there will be some cure time before that last bit of membrane goes on though. I have never heard of that before.They have to tape the circular plastic membrane over each individual pier hole after it is been poured. Sometimes you just have to wonder what the hell is going on in this industry. Re: Piers\Footing poured at same time as slab? 13Sep 01, 2015 8:41 am Option 1 Drill out pier holes, clean out and have them inspected, then back up concrete truck and have them filled with concrete, then proceed to form slab on top, then pour slab(pump concrete in)(I have done it many times) Option 2 Drill out pier holes, have them inspected and approved then keep them open whilst forming slab on top, (don't forget there will be volume of excavated soil from pier holes how will you prepare level base for slab without some of the dirt falling back in?) then pump concrete into piers, fix membrane and pour slab. Option 2 makes no sense to me( what if it rains overnight and pier holes fill with water and sides collapse?). It's a free country and making wrong choices is perfectly legal. 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: Piers\Footing poured at same time as slab? 14Sep 01, 2015 2:14 pm Option 1 is the correct option in my opinion not sure why anybody would do it another way but I suppose people can try and make the construction more efficient but I don't think this is the way Re: Piers\Footing poured at same time as slab? 15Sep 02, 2015 5:33 pm Was the site pour supervised by Schrodinger's cat perchance? 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: Piers\Footing poured at same time as slab? 16Sep 02, 2015 7:27 pm It's easy to do and very common. Drill pier holes then cover the entire pad with plastic, mark pier location on plastic with paint so you dont stand on them. Box up and prep the slab, then when its all done you take a knife and cut the plastic where the piers are. No mess No fuss and no need to think there has been anything untoward done on your slab. Re: Piers\Footing poured at same time as slab? 17Sep 02, 2015 11:01 pm mgilla It's easy to do and very common. Drill pier holes then cover the entire pad with plastic, mark pier location on plastic with paint so you dont stand on them. Box up and prep the slab, then when its all done you take a knife and cut the plastic where the piers are. No mess No fuss and no need to think there has been anything untoward done on your slab. Interesting mgilla Then after you have poured the piers do you put more plastic down and tape it ? Re: Piers\Footing poured at same time as slab? 18Sep 03, 2015 5:39 pm insider mgilla It's easy to do and very common. Drill pier holes then cover the entire pad with plastic, mark pier location on plastic with paint so you dont stand on them. Box up and prep the slab, then when its all done you take a knife and cut the plastic where the piers are. No mess No fuss and no need to think there has been anything untoward done on your slab. Interesting mgilla Then after you have poured the piers do you put more plastic down and tape it ? why? Re: Piers\Footing poured at same time as slab? 19Sep 03, 2015 6:12 pm The piers are in contact with the soil and moisture could travel up the pier onto the slab.Defeats the purpose of a moisture barrier but I'm guessing because I haven't seen it done before. Re: Piers\Footing poured at same time as slab? 20Sep 03, 2015 6:46 pm insider The piers are in contact with the soil and moisture could travel up the pier onto the slab.Defeats the purpose of a moisture barrier but I'm guessing because I haven't seen it done before. I agree I am with Structural BIMGuy, check your engineering design and specification and ensure it is followed. 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 Hello needing some advice. I was about to build my Alfresco and needed a new slab and remove exisiting slab as its not standard. So they start to excavate and jackhammer… 0 10911 yep sounds good make the footing bigger to to allow for the pipe in the middle 3 7340 PM me your email. I have a build excavation calculator you can use based on your plans to double check what your builder is telling you. Cheers Simeon 1 10288 |