Browse Forums General Discussion 1 Apr 27, 2018 12:24 pm There is a concrete floor deck (with metal on bottom) between ground (garage) and first floor(lounge) in our house (solid brick, built circa 1972). I noticed a deflection of approx 20mm for beams 4.20 meter long. Floor area is approx 31.5 sqm (7.5*4.2). We bought the house recently and tight on finances. Is it something we need to attend urgently or it can wait? How much would it cost to fix a problem in Adelaide region? What methods local builders use? Can someone recommend a builder with a good structural engineer to do this kind of job? Re: Concrete Deflection 2Apr 27, 2018 1:32 pm gag The code AS3600 limits deflection for serviceability to span/250 4200/250= 16.8mm Other factors would need to be considered.. please contact a Structural Engineer and have it inspected.hth Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Concrete Deflection 3Apr 27, 2018 2:40 pm StructuralBIMGuy The code AS3600 limits deflection for serviceability to span/250 4200/250= 16.8mm Other factors would need to be considered.. please contact a Structural Engineer and have it inspected.hth Thank you for your response. I came across AS3600 yesterday. The deflection of 20mm is above a limit and it is why I started this topic. Re: Concrete Deflection 4Apr 27, 2018 8:14 pm Thanks for the reply, the deck ribs and concrete form a Composite Slab if outdoors It will need to be properly assessed for concrete cracking->deck corrosion-> fit for purpose? Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Concrete Deflection 5Apr 28, 2018 10:27 am Don't forget that the house is 45 years old and you would expect long term concrete creep, 20mm-16.8mm= 3.2mm. Is that significant for you? 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 When you get a chance watch the last couple of videos. The cracks are pretty bad, it's almost as though he hasn't put any reo in that corner and hasn't compacted/levelled… 2 3358 You are fine. The concrete is never going to explode. Worse case scenario is that it develops a crack from different rates of expansion but hopefully it's got some… 5 4509 |