Browse Forums Building Standards; Getting It Right! Re: New house slab work quality in doubt 3May 25, 2019 9:18 am Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: New house slab work quality in doubt 4May 25, 2019 6:37 pm Leeway Hi first home build here. Thanks in advance. Just got the slab poured yesterday and want to get some advice on the quality of the job and whether I should follow up with the builder. To late for me to hire an independent inspector before the concrete being poured and I only have some pics before the pour. And builder is going to start frame work tomorrow, you can see timber has been put on the garage slab. so the concrete is only cured less than 2 days. I found some issues today, 1. Side or edges of the slab is not smooth, I think this is how it is generally being done? Since they will be covered by brick later on? 2. A crack on the footing or rebate about 320mm long and more than 2mm wide and I can feel the area is not in the same level, should I be concerned. 3. The foundation is not in a straight line, i measured from the edge of the foundation to the edge of the footing. it is 140mm at one end and 160mm at the other end as you see from the pic. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ I can't tell u if there are actual issues. But from your the slab photos they looks fine IMO.. No different then any other slabs I seen. Re: New house slab work quality in doubt 5Oct 06, 2019 7:07 pm My suspended first floor concrete slab poured 3 week ago, the formwork removed and the thickness of the slab are not the same throughout, there are area 5cm thicker than 20cm engineering designed. Is it normal ??? I try to find infor on this but unsuccessfully. Anyone know please chime in. Thanks Re: New house slab work quality in doubt 6Oct 06, 2019 7:36 pm Hi Smcphee Welcome to the forum You will need to check the engineering Drawings/Details Suspended Slabs are generally in Brick coursing (Std Brick 86mm) 2c 172mm or 3c 254mm. Step down in the slab soffits are designed over internal wall supports generally, do you have photos? More Info Required Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: New house slab work quality in doubt 7Oct 06, 2019 8:07 pm Hi. Thanks for responding Just when walking up plain stair one side the measurements show 25m and other side show 20cm The engineer design say “to be 200mm”- UNO. Not sure if this is normal due to the concrete sink during cure Or issue that I need to raise with builder ??? Also As the result of this the down stair ceiling varies different place by 2cm, same as upstair ceiling. Thanks S. Re: New house slab work quality in doubt 8Oct 07, 2019 9:05 am SMcphee The engineer design say “to be 200mm”- UNO. Unless Noted Otherwise UNO The engineer notes the slab thicknesses on the engineering plan are you using 190mm wall blocks? The builder has no say in varying the slab thickness, the engineer must amend and sign his drawings? SMcphee Not sure if this is normal due to the concrete sink during cure Or issue that I need to raise with builder ??? LOL who told you the concrete sinks during curing? Ask the builder whose certified engineering plans is he following and then contact your Council Building Surveyor? SMcphee Also As the result of this the down stair ceiling varies different place by 2cm, same as upstair ceiling. BTW, Photos help others Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: New house slab work quality in doubt 9Oct 07, 2019 9:59 am Hi, Now I am concern !!! I will go on site and get few photo of the area of concern. Yes you are right about the UNO. I checked engineer spec, every thing seem fine except the uneven thickness of the upper floor slab and uneven height of both ceiling. Is the strength of the house compromise because of this ??? Thanks Re: New house slab work quality in doubt 10Oct 07, 2019 10:03 am StructuralBIMGuy SMcphee The engineer design say “to be 200mm”- UNO. Unless Noted Otherwise UNO The engineer notes the slab thicknesses on the engineering plan are you using 190mm wall blocks? The builder has no say in varying the slab thickness, the engineer must amend and sign his drawings? SMcphee Not sure if this is normal due to the concrete sink during cure Or issue that I need to raise with builder ??? LOL who told you the concrete sinks during curing? Ask the builder whose certified engineering plans is he following and then contact your Council Building Surveyor? SMcphee Also As the result of this the down stair ceiling varies different place by 2cm, same as upstair ceiling. BTW, Photos help others Wall just double brick for external wall and single for internal wall. And yes I will check to make sure the engineer plan is certified. Re: New house slab work quality in doubt 11Oct 07, 2019 10:18 am SMcphee I checked engineer spec, every thing seem fine except the uneven thickness of the upper floor slab and uneven height of both ceiling. Uneven heights of the ceiling below the slab Should be shown on the engineering suspended Slab Drawings All suspended slabs should be inspected and certified by an Engineer was this not done? SMcphee Is the strength of the house compromise because of this ??? As I said it could be a dropped soffit slab, which is thicker ? Inspecting the slab reinforcement after the concrete pour requires Specialist Steel detection/measuring Equipment Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: New house slab work quality in doubt 12Oct 07, 2019 6:19 pm StructuralBIMGuy SMcphee I checked engineer spec, every thing seem fine except the uneven thickness of the upper floor slab and uneven height of both ceiling. Uneven heights of the ceiling below the slab Should be shown on the engineering suspended Slab Drawings All suspended slabs should be inspected and certified by an Engineer was this not done? SMcphee Is the strength of the house compromise because of this ??? As I said it could be a dropped soffit slab, which is thicker ? Inspecting the slab reinforcement after the concrete pour requires Specialist Steel detection/measuring Equipment Cheers Chris The slab on right hand side is 5cm thicker than left hand side, not really sure about dropped soffit. I think certifier due to check including this this week before roof install. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: New house slab work quality in doubt 13Oct 07, 2019 6:33 pm I'm not an engineer but have been in the building industry for 30 years. Without seeing your engineering drawings I'd say that the slab on the right is over an open plan area and as such is often 258mm (3 course) to take the span. We had a mix of 172mm (2 course) across smaller spans but required 258 across our open plan living in our last house that I owner built. Changes in ceiling height won't be in obvious places, it will change either side of an opening. As BIM guy said. The structural steel reinforcement should have been inspected by the structural engineer and signed off. Your builder should have this. Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: New house slab work quality in doubt 14Oct 08, 2019 10:09 am Hi SMcphee Thanks for the photo Your photo has highlighted potentially another issue with with varying Soffits ( Below Ceiling Heights) at wall junctions, namely the placement of the slip joints which allows for movement alleviating the potential for brick wall cracking. BTW Take photos for future reference, so you will have a case for claims outside of the warranty period hth Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: New house slab work quality in doubt 15Oct 08, 2019 5:36 pm StructuralBIMGuy Hi SMcphee Thanks for the photo Your photo has highlighted potentially another issue with with varying Soffits ( Below Ceiling Heights) at wall junctions, namely the placement of the slip joints which allows for movement alleviating the potential for brick wall cracking. BTW Take photos for future reference, so you will have a case for claims outside of the warranty period hth Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Wow, Thanks so much for this, definitely outside of my knowledge. Tomorrow the tile roof is on. As scheduled, Certifier must have checked it today prior to tile roof. Wondering if certifier checked on !!! Re: New house slab work quality in doubt 16Oct 08, 2019 5:40 pm chippy I'm not an engineer but have been in the building industry for 30 years. Without seeing your engineering drawings I'd say that the slab on the right is over an open plan area and as such is often 258mm (3 course) to take the span. We had a mix of 172mm (2 course) across smaller spans but required 258 across our open plan living in our last house that I owner built. Changes in ceiling height won't be in obvious places, it will change either side of an opening. As BIM guy said. The structural steel reinforcement should have been inspected by the structural engineer and signed off. Your builder should have this. Thanks, you quite right, the right side is an open plan. I can sleep now. Much appreciated and thanks again !!! I posted the floorplan on Houzz.com forum and got some really good ideas and advice from people there. 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