Browse Forums Building A New House 1 May 30, 2021 9:37 pm Hi Everyone We are in the process of having an off the plan house built by a volume builder (They are doing the entire few streets in the area), it's at the slab down stage (Estimated settlement October/November)and I was looking for some advice and guidance, being quite clueless to this process. I noticed that the slab in general seems rough along the front as well as one of the middle-left corners - it has gaps or air voids in the fill. (Honeycombing?) There is also a chunk of concrete missing on the front left side corner and what remains on the slab at that corner seems like it may also be cracking? What do you think of this and whether it is normal/cosmetic, and if it should or can be remedied at this stage? I have no idea as I've never really looked at a slab before(First home), as the builder is also doing the entire street I took a look at some of their slabs and some look a bit smoother. I'm actually not sure we can actually get an independent inspector out at this stage for an off the plan home (Single contract, not stages as for a building contract) as I think the builder will just allow them as a final inspection but I haven't pushed that yet (or raised it with the builder) Cheers! Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: New home build, Concrete Slab quality question 2May 31, 2021 10:06 am Hey newhome2021 Welcome to the forum and thanks for the photos The concreter's start at the back and works to the front in which time the concrete starts the setting process. To avoid voids it is recommended that the concrete is vibrated. A bit of concrete Bleeding around the formwork and honey combing is acceptable. If you aren't sure have it inspected...OT, it's too late now as the pour should have been inspected Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: New home build, Concrete Slab quality question 3May 31, 2021 12:39 pm Thanks Chris for your reply and detail! Seems like a bit of lack of vibration as you say, do you think this should be remedied (Have heard structural grout) or is cosmetic and can be left as is? I have raised it with the builder and awaiting feedback Re: New home build, Concrete Slab quality question 4Jun 01, 2021 3:11 pm StructuralBIMGuy Hey newhome2021 Welcome to the forum and thanks for the photos The concreter's start at the back and works to the front in which time the concrete starts the setting process. To avoid voids it is recommended that the concrete is vibrated. A bit of concrete Bleeding around the formwork and honey combing is acceptable. If you aren't sure have it inspected...OT, it's too late now as the pour should have been inspected Cheers Chris Very good explanation Chris 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: New home build, Concrete Slab quality question 5Jun 02, 2021 1:38 pm newhome2021 Thanks Chris for your reply and detail! Seems like a bit of lack of vibration as you say, do you think this should be remedied (Have heard structural grout) or is cosmetic and can be left as is? I have raised it with the builder and awaiting feedback In the first photo there is a significant crack on the rebate, sometimes they put studs or columns on the rebate, you need to ask the design Engineer to check if they have designed a stud/column on the rebate. In regards to honey combing, your RBS needs to get the design Engineer to comment on it, they should patch it to ensure cover to reinforcements are not compromised. Do you know whether the slab has been poured in one stage or if it has been poured in two stage for the first photo? yep, clearly mark where the infloor heating pipes are before drilling or nailing 1 6041 What you are looking at is fibrous plaster, true gypsum, it is cast on horizontal beds with fibers included to give strength. I has no Asbestos in it. Houses before 1985… 2 7113 |