Hi,
My builder told me that we will have "Rigid Slab Freeboard". We signed for raft slab. Is it different name of raft slab or something else?
Browse Forums General Discussion Re: What is Rigid Slab Freeboard? 7Mar 19, 2019 3:35 pm Vikhome It just says Slab on ground detail- H2 (Type 4-2) in engineering document not sure what that means Surprised no experts replied on your thread. My contract include the engineering for the slab. Probably u haven't got it yet. Re: What is Rigid Slab Freeboard? 8Mar 20, 2019 8:41 pm MyFirst Vikhome It just says Slab on ground detail- H2 (Type 4-2) in engineering document not sure what that means Surprised no experts replied on your thread. My contract include the engineering for the slab. Probably u haven't got it yet. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Thanks, These are the drawing I got, however not clear if its raft or not.. Re: What is Rigid Slab Freeboard? 9Mar 20, 2019 8:43 pm Vikhome MyFirst Vikhome It just says Slab on ground detail- H2 (Type 4-2) in engineering document not sure what that means Surprised no experts replied on your thread. My contract include the engineering for the slab. Probably u haven't got it yet. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Thanks, These are the drawing I got, however not clear if its raft or not.. Mate if u fwded this drawing the 1st time. U would have got a fast answer. From your drawing it is a raft slab. So all good for u. Re: What is Rigid Slab Freeboard? 11Mar 21, 2019 3:02 am My understanding that as long as the slab is built on top of a freeboard (similar to pods, used for flood protection), this is just another name for the waffle pod construction. Your engineer also refers to the slab "on ground", not "in ground", which is another indicator of waffle pod construction. Also, if it is really an H2 soil class slab, half of which will be resting on a compacted fill, your footings should be on piers or screw piles. Especially, considering that cut and fill is running through the slab. I wouldn't be even thinking about waffle pod on H2, if I were you. Re: What is Rigid Slab Freeboard? 12Mar 21, 2019 6:21 am alexp79 My understanding that as long as the slab is built on top of a freeboard (similar to pods, used for flood protection), this is just another name for the waffle pod construction. Your engineer also refers to the slab "on ground", not "in ground", which is another indicator of waffle pod construction. Also, if it is really an H2 soil class slab, half of which will be resting on a compacted fill, your footings should be on piers or screw piles. Especially, considering that cut and fill is running through the slab. I wouldn't be even thinking about waffle pod on H2, if I were you. The slab drawing is not a waffle pod slab. Re: What is Rigid Slab Freeboard? 13Mar 21, 2019 7:46 am alexp79 My understanding that as long as the slab is built on top of a freeboard (similar to pods, used for flood protection), this is just another name for the waffle pod construction. Your engineer also refers to the slab "on ground", not "in ground", which is another indicator of waffle pod construction. Freeboard is a hydrological concept, not a product. The 310mm freeboard is the height difference between the rebate and the slab FSL. This is annotated on the drawings. The drawings show a stiffened raft, not a void formed slab. You don't place bedding sand on top of pods, and the inside edges of the perimeter beams are sloped - pods have vertical faces. While natural surface isn't explicitly annotated, it appears as if the footings are excavated below it. Re: What is Rigid Slab Freeboard? 16Mar 21, 2019 11:57 am alexp79 Got it, I have got confused with "slab on ground" and what the freeboard was. Still interesting why there are no piers. Yes, I find it interesting in regards to piers in general. Why volume builder uses waffle slab and then pier the hack out of the site.. Not uncommon to read on homeone, they have 40-60 piers... While small builder that uses raft slab.. they are very reluctant to pier the site as if they trust their raft slab while volume builder trust their piering... as we know piering is just to stop the house from "sinking" if...... But at the end, best of both world is raft slab with piers. But then probably that's is too expensive for an average customer to accept. Re: What is Rigid Slab Freeboard? 17Mar 21, 2019 12:34 pm MyFirst alexp79 Got it, I have got confused with "slab on ground" and what the freeboard was. Still interesting why there are no piers. Yes, I find it interesting in regards to piers in general. Why volume builder uses waffle slab and then pier the hack out of the site.. Not uncommon to read on homeone, they have 40-60 piers... While small builder that uses raft slab.. they are very reluctant to pier the site as if they trust their raft slab while volume builder trust their piering... as we know piering is just to stop the house from "sinking" if...... But at the end, best of both world is raft slab with piers. But then probably that's is too expensive for an average customer to accept. When there is extremely reactive soil used as doubtful and probably not very well compacted fill (you won't be able to well compact reactive clay, anyway), so I am not sure how they can pull it out without piers. There will be certainly difference in soil reactivity levels, so looks like slab heave is inevitable no matter how strong the slab is. Another important thing is that piers should be always connected with the slab through reinforcement as ideally they should not only help to prevent "sinking" but also "lifting". Re: What is Rigid Slab Freeboard? 18Mar 21, 2019 1:01 pm alexp79 Another important thing is that piers should be always connected with the slab through reinforcement as ideally they should not only help to prevent "sinking" but also "lifting". I think it depends on the reason for the piering. For instance, if they've been specified to address the impacts of a tree of influence (soil drying/shrinkage only) rather than soil reactivity (shrink or swell) then I'm not sure if there is a need to tie them to the slab. In this case the vapour barrier acts as on bond breaker so that the top "skin" of the unconnected pier doesn't get pulled off. I'm sure there's a few geo's here who could set me straight though. Hello all, I am thinking of getting my flooring replaced with Hybrid flooring. I visited some shops(only reputed ones, for better service and warranty). So far i liked… 0 2500 Thanks for the insights, that makes perfect sense, and yeah, I will be leaning on the experience of the excavator operator entirely. 6 16142 4 6201 |