Browse Forums General Discussion Re: Strip footing or raft slab? 2Nov 02, 2021 8:01 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: Strip footing or raft slab? 4Nov 02, 2021 1:38 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: Strip footing or raft slab? 5Nov 02, 2021 2:52 pm Architectural Homes & Duplexes - specialising in custom designing homes to your budget Get a Free Onsite Consultation Today or send a PM for information, questions or advice. Re: Strip footing or raft slab? 6Nov 02, 2021 3:48 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: Strip footing or raft slab? 9Nov 04, 2021 12:07 pm Architectural Homes & Duplexes - specialising in custom designing homes to your budget Get a Free Onsite Consultation Today or send a PM for information, questions or advice. Re: Strip footing or raft slab? 11Nov 04, 2021 6:35 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: Strip footing or raft slab? 14Nov 05, 2021 5:41 am building-expert I think it's engineering vs common sense It does not seem sensible to me to put a raft slab to float on loose sand when rock is down 1.7m or less Raft slabs are engineered structures and require contractors with skills to construct and are very expensive once you factor in site costs and prone to failure for variety of reasons. There is no engineering in strip footings and pads that are taken down to rock, will last forever and is probably cheaper So raft slabs are more prone to failure? 😨 Re: Strip footing or raft slab? 15Nov 05, 2021 5:51 am Savagepuppy building-expert I think it's engineering vs common sense It does not seem sensible to me to put a raft slab to float on loose sand when rock is down 1.7m or less Raft slabs are engineered structures and require contractors with skills to construct and are very expensive once you factor in site costs and prone to failure for variety of reasons. There is no engineering in strip footings and pads that are taken down to rock, will last forever and is probably cheaper So raft slabs are more prone to failure? 😨 Now my architect is asking the second engineer why screw piling is not chosen being sand? The first engineer‘S initial plan was screw piling without the geotect report . I’m so confused 😐 Re: Strip footing or raft slab? 16Nov 05, 2021 6:20 am Savagepuppy building-expert I think it's engineering vs common sense It does not seem sensible to me to put a raft slab to float on loose sand when rock is down 1.7m or less Raft slabs are engineered structures and require contractors with skills to construct and are very expensive once you factor in site costs and prone to failure for variety of reasons. There is no engineering in strip footings and pads that are taken down to rock, will last forever and is probably cheaper So raft slabs are more prone to failure? 😨 Yes I have seen hundreds of slab failures. I am defining failure when movement of slab exceeds allowable construction tolerances 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: Strip footing or raft slab? 18Nov 05, 2021 10:38 am Yes, you can have strip footings and then put on top stumps and cover with yellow tongue (still sounds like a cheapish farm house solution to me rather than prominent double brick residence) or you can put raft slab on top of your strip footings. There also other ways (arguably cheaper and more reliable than raft) e.g. having suspended slab with Bondek or Speedfloor over your strip footings. Re: Strip footing or raft slab? 19Nov 05, 2021 10:22 pm building-expert Savagepuppy building-expert I think it's engineering vs common sense It does not seem sensible to me to put a raft slab to float on loose sand when rock is down 1.7m or less Raft slabs are engineered structures and require contractors with skills to construct and are very expensive once you factor in site costs and prone to failure for variety of reasons. There is no engineering in strip footings and pads that are taken down to rock, will last forever and is probably cheaper So raft slabs are more prone to failure? 😨 Yes I have seen hundreds of slab failures. I am defining failure when movement of slab exceeds allowable construction tolerances That sounds pretty bad. Does that mean there will be subsidence when movement of slab exceeds allowable construction tolerances? That’s the lat problem I want to have 😖😟 Re: Strip footing or raft slab? 20Nov 05, 2021 10:23 pm alexp79 https://cornellengineers.com.au/what-is-a-raft-slab/ Many thanks, really helpful yep sounds good make the footing bigger to to allow for the pipe in the middle 3 7299 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 10208 I've dug some footings to embed a post anchor into. My holes are around 450mm deep which I'll put a 200mm stirrup into. The bottom of these holes seem firm enough. … 0 3302 |