Browse Forums Building A New House Re: Slab engineering for double brick home 5Jul 11, 2020 8:22 am insider ReneeN insider Hi ReneeN What did the soil test report say ? Hi we had a geotech report which says Site P Soil M Wind N1 ? And why was it a "P" site ? It does not explicitly describe, but the only thing they have ticked is ‘existing fill’. Which it is a cut and fill pad. Re: Slab engineering for double brick home 6Jul 12, 2020 10:07 am ReneeN It is clay soil, but for example they want us to dig about 100 piers for only a 30 square meter house, and then a heap of beams all throughout the slab. It just seems to be absolute overkill to me although I admit I am not an engineer! You will need to take your geotech report and design to an engineer ReneeN Essentially it is looking like it will cost 2x or more than what we budgeted for the slab alone. I don't know what your budget is, but it sounds like you were ill prepared Class A ( reference Point) slabs generally take a couple of days Class M can take up to 4-5 days add another 1-2 day for piers, LOL, who told you 100 piers the salesman? Get your slab and footings designed, engineered , quantified using 3D Bim Slab and formwork Costs Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab engineering for double brick home 7Jul 12, 2020 10:18 am StructuralBIMGuy ReneeN It is clay soil, but for example they want us to dig about 100 piers for only a 30 square meter house, and then a heap of beams all throughout the slab. It just seems to be absolute overkill to me although I admit I am not an engineer! You will need to take your geotech report and design to an engineer ReneeN Essentially it is looking like it will cost 2x or more than what we budgeted for the slab alone. I don't know what your budget is, but it sounds like you were ill prepared Class A ( reference Point) slabs generally take a couple of days Class M can take up to 4-5 days add another 1-2 day for piers, LOL, who told you 100 piers the salesman? Get your slab and footings designed, engineered , quantified using 3D Bim Slab and formwork Costs Cheers Chris This has been engineered - the engineering drawings is what I am referring to - they seem to be overkill and I don’t really get your LOL and what the joke is but yes there are 100 piers in the drawing he has done, as well as multiple 600 deep beams. I actually don’t think we were I’ll prepared and that’s the whole point I think this seems quite excessive for a small house we are not building a nuclear reactor! Before I waste potentially another few thousand getting it re-engineered and maybe ending up with the same thing if this is how it has to be I was just trying to find out if this is standard. Re: Slab engineering for double brick home 8Jul 12, 2020 10:40 am Hey you haven't put any information up, so there is no plan/engineering autopsy ( if your project dies). for the AS codes Try Masonry Small Buildings AS4773.2 Residential Footings Slabs AS2870 BTW I have never certified 100 piers under a small house it is generally over kill But i would imagine $100/pier x 100 pier = a quick $10K to the builder who hired the engineer? I suggest you have it checked by your own engineer and search $ticker $hock on the forum Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab engineering for double brick home 9Jul 12, 2020 11:04 am StructuralBIMGuy Hey you haven't put any information up, so there is no plan/engineering autopsy ( if your project dies). for the AS codes Try Masonry Small Buildings AS4773.2 Residential Footings Slabs AS2870 BTW I have never certified 100 piers under a small house it is generally over kill But i would imagine $100/pier x 100 pier = a quick $10K to the builder who hired the engineer? I suggest you have it checked by your own engineer and search $ticker $hock on the forum Cheers Chris Thanks - well the builder is not associated with the engineer both designer and engineer are independent of the builder and the builder is the one who said it’s ridiculous. The engineer insists it’s Australian standard. I’ll check out what you have mentioned. Thank you Re: Slab engineering for double brick home 10Jul 12, 2020 2:17 pm StructuralBIMGuy Hey you haven't put any information up, so there is no plan/engineering autopsy ( if your project dies). for the AS codes Try Masonry Small Buildings AS4773.2 Residential Footings Slabs AS2870 BTW I have never certified 100 piers under a small house it is generally over kill But i would imagine $100/pier x 100 pier = a quick $10K to the builder who hired the engineer? I suggest you have it checked by your own engineer and search $ticker $hock on the forum Cheers Chris I didn’t want to put the drawings up as I don’t want to run the engineer under the bus if it is legit how it needs to be I just want to try and do my own research before blindly trusting someone when there is some conflicting opinions from the builder. I can’t find those codes for me to be able to actually read without buying them and Sticker shock is all posts by you but it seems to be with project homes and people getting ripped off but this is an independent build by us, we have engaged a designer who engaged this engineer but the builder is completely separate so no kickbacks for them or profit to be made by them, in fact the builder is the one saying this is way too much and will be far more expensive than it needs to be for the work. I have no idea I don’t build houses every day and I am not an engineer so perhaps it is legit and we just have to pay more than we thought which is fine, but I also don’t want to be ripped off by someone who is just engineering the hell out of something for the sake of it! Is there some sort of resource or body that helps people deal with things like this, like a ‘where to go for a second opinion or what to do if you think you are being ripped off’ as you would with any other type of consumerism? This whole process seems like it is a blind trust exercise that results in average people being stuffed around. Re: Slab engineering for double brick home 11Jul 12, 2020 3:59 pm Will you be able to share your geotech report and site survey? There are several structural engineers on the forum who can provide good advice and second opinion. Also, please share what type of house you are planning to build (double brick, brick veneer, etc.). Re: Slab engineering for double brick home 12Jul 12, 2020 4:05 pm alexp79 Will you be able to share your geotech report and site survey? There are several structural engineers on the forum who can provide good advice and second opinion. Also, please share what type of house you are planning to build (double brick, brick veneer, etc.). Thanks Alex yes I will share the geotech on here. Is a site survey something different from the geotech? If so we didn’t have that done we only did a geotech. It is double brick external and will be steal frame internal. Re: Slab engineering for double brick home 13Jul 12, 2020 4:09 pm So double brick or single brick external? Single brick with steel frame where still frame is load-bearing is brick veneer. Double brick (with cavity) is structural construction which is not requiring frame, as the internal leaf acts as load-bearing wall. Site survey indicates the levels across the site as well as your house plan together with site survey should be providing information on the heights of cut and fill required. Also, your developer should be providing compaction report, I believe. Re: Slab engineering for double brick home 14Jul 12, 2020 4:09 pm 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 ⋅ Hope these work? Should be pictures of the geotech report Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Slab engineering for double brick home 15Jul 12, 2020 4:12 pm alexp79 So double brick or single brick external? Single brick with steel frame where still frame is load-bearing is brick veneer. Double brick (with cavity) is structural construction which is not requiring frame, as the internal leaf acts as load-bearing wall. Site survey indicates the levels across the site as well as your house plan together with site survey should be providing information on the heights of cut and fill required. Also, your developer should be providing compaction report, I believe. Cavity brick around the outside/external basically and then the internal walls will be built with steel frame. Does that make sense? Re: Slab engineering for double brick home 16Jul 12, 2020 4:14 pm What is the contour of your building envelope? Looks like you have around 1 meter of fill only near BH2, but near BH1 and BH3 - everything looks quite ok and natural (even with a good chance to hit a rock when excavating near BH1). Re: Slab engineering for double brick home 17Jul 12, 2020 4:16 pm ReneeN alexp79 So double brick or single brick external? Single brick with steel frame where still frame is load-bearing is brick veneer. Double brick (with cavity) is structural construction which is not requiring frame, as the internal leaf acts as load-bearing wall. Site survey indicates the levels across the site as well as your house plan together with site survey should be providing information on the heights of cut and fill required. Also, your developer should be providing compaction report, I believe. Cavity brick around the outside/external basically and then the internal walls will be built with steel frame. Does that make sense? Got it. Internal walls will be built using steel studs. So your house is full masonry and this is why engineer specified deeper footings. Will you be able to provide engineering drawings for your footings? Re: Slab engineering for double brick home 18Jul 12, 2020 5:07 pm 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 ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ These are the drawings from the engineer Re: Slab engineering for double brick home 19Jul 12, 2020 5:08 pm alexp79 What is the contour of your building envelope? Looks like you have around 1 meter of fill only near BH2, but near BH1 and BH3 - everything looks quite ok and natural (even with a good chance to hit a rock when excavating near BH1). I’m not entirely sure, would that be something done from a surveyor? We didn’t get that done it wasn’t indicated as needed. I can attach a photo of the building pad? Re: Slab engineering for double brick home 20Jul 12, 2020 7:00 pm AS2870 and AS4773.2 are copyright Australian Standards so you will need to buy them
https://www.techstreet.com/sa/standards ... id=2048299 https://www.techstreet.com/sa/standards ... id=2068452 or head across to the Steel Reinforcement Institute of Australia website https://www.sria.com.au/downloads.html and download this presentation https://www.sria.com.au/LiteratureRetrieve.aspx?ID=199666 which probably has enough detail for you. Take a look a Page 54 and you will your slab itself looks consistent with a Class M / Articulated full masonry construction (albeit with 3-L12TM in your case) As per the other opinions expressed, if it was for my house, I would query the number of piers proposed. Assuming you've modelled the TB8, TB10, TB12, TB2 & J1 joists/LVLs there, it appears as per drawing to me. There maybe should be an additional J1 between TB10 and T12 if… 3 31839 Thanks for all replies. I just noticed now the pictures I added to post right on top of page were wrong. I attached pictures showing "current" and my "suggested" floor… 9 14652 5 10493 |