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Browse Forums General Discussion Re: Slab Heave Cause? 42Aug 02, 2018 6:49 pm 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: Slab Heave Cause? 45Aug 03, 2018 10:14 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: Slab Heave Cause? 56Aug 06, 2018 4:57 pm No I have seen raft slabs heave from that period.There may be slightly less damage but it is hard to compare directly to waffle slabs because each situation can be different as far as cause and degree of wetting etc. The reason you don't see as many raft slabs heave as waffles in that period is simply there were much more waffles built than rafts. I still prefer a raft for several reasons one being that the perimeter beam is dug into the ground providing a minor barrier to water getting under the slab. Re: Slab Heave Cause? 57Aug 06, 2018 4:58 pm insider No I have seen raft slabs heave from that period.There may be slightly less damage but it is hard to compare directly to waffle slabs because each situation can be different as far as cause and degree of wetting etc. The reason you don't see as many raft slabs heave as waffles in that period is simply there were much more waffles built than rafts. I still prefer a raft for several reasons one being that the perimeter beam is dug into the ground providing a minor barrier to water getting under the slab. Question for you insider, I see some of our SA friends still use in ground raft slabs even for budget builds, why is that? Re: Slab Heave Cause? 59Aug 06, 2018 5:11 pm Yes its ironic isn't it.They invented the waffle and now they don't use them.The reason is that they actually call site class"E" in SA so for waffles the step up is too much.With the raft "E" it can be dug in and the step up isn't a problem.Here in Vic everyone is too scared to call a site "E" as they are afraid they will lose their client to someone who calls it a "H2" and the builder can still use waffle slabs. During the drought the ground movement calculations were done as if it were normal conditions but in reality they should have been increased significantly.Therefore a lot of site should have been classified as "E" but weren't basically because builders wanted to use waffles and would take their business to someone who classified "H2 so they could keep using waffles. Re: Slab Heave Cause? 60Aug 06, 2018 5:14 pm insider Yes its ironic isn't it.They invented the waffle and now they don't use them.The reason is that they actually call site class"E" in SA so for waffles the step up is too much.With the raft "E" it can be dug in and the step up isn't a problem.Here in Vic everyone is too scared to call a site "E" as they are afraid they will lose their client to someone who calls it a "H2" and the builder can still use waffle slabs. During the drought the ground movement calculations were done as if it were normal conditions but in reality they should have been increased significantly.Therefore a lot of site should have been classified as "E" but weren't basically because builders wanted to use waffles and would take their business to someone who classified "H2 so they could keep using waffles. That's terrible. So only people in SA have brains and the rest of the states are filled with consumers with too high expectations and builders too willing to please whatever the cost? Is it the water that's special in SA or something? Firstly the ableflex that has been installed needs (manufactures specification) a sealant cap over the top, preventing water draining down between the slab and the… 3 7744 1 6601 |