Browse Forums Building Standards; Getting It Right! Re: Slab for retaining wall: advice needed 3Mar 08, 2023 1:02 pm Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab for retaining wall: advice needed 5Mar 08, 2023 2:29 pm In NSW retaining walls above 600MM high require engineering. aside from that, the way you've laid out the diagram , your path isnt sufficient as a footing on the basis that the footing for a retaining wall would extend out both sides of the wall. You diagram has it all loaded on one edge. Best to go see an engineer. Re: Slab for retaining wall: advice needed 6Mar 08, 2023 2:53 pm ponzutwo your path isnt sufficient as a footing on the basis that the footing for a retaining wall would extend out both sides of the wall. You diagram has it all loaded on one edge. Your talking nonsense? Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab for retaining wall: advice needed 7Mar 08, 2023 3:10 pm may not have expressed myself clearly enough, but this wall still needs to be engineered as its over the max height for NSW to be done on the cheap. Comment stands, go see an engineer. Re: Slab for retaining wall: advice needed 8Mar 08, 2023 7:01 pm I was assuming it was already engineered as per your diagram? You can just extend it incorporating your extra slab apron as a monolithic pour, or you can top it, whatever the concretor prefers. If the footing is stepped then second pour might be easier Re: Slab for retaining wall: advice needed 9Mar 09, 2023 12:13 am My question would be, where is the water going to go? Any rain will just pool against the retaining wall. I'd drop the footing for the retaining wall down another 100mm and pour that first, then build your retaining wall. Then install a drain against the retaining wall and pour your path to run into that. You don't want water pooling so make sure you pay attention to drainage. Accessible Carpentry & Cabinets accessiblecarpentry@gmail.com accessiblecarpentry.com.au https://www.facebook.com/pages/Accessible-Carpentry-Cabinets/583314911709039 Re: Slab for retaining wall: advice needed 10Mar 09, 2023 6:48 am Drainage issue: the wall is approx 7m long and straight, no steps. Surface drain pipe is installed in the middle of the run. The intent is to split and taper (in addition to 1:20) the slabs towards the centre at 1:100. Then install a surface drain where wall meets slab, being the lowest point. Control joint for the wall and the slab will be at this point also. Height issue. Max height is 1m - can't go higher. Taper from the house at 1:20 drops the slab by 50mm at the retaining wall (this taper is shown on the sketch). An additional taper 1:100 along the length at 3.5 m gives an additional drop of 35 mm. So the total is already 85 mm. Dropping it down by another 100mm, assuming you're talking about strip drain, will lower the entire wall by 185mm... What is engineered is the 700 X 200 slab and the retaining wall details. What I want is to extend it using 500x75 slab towards the house , and taper it, of course. Re: Slab for retaining wall: advice needed 11Mar 09, 2023 7:13 am wayfarer What is engineered is the 700 X 200 slab and the retaining wall details. What I want is to extend it using 500x75 slab towards the house , and taper it, of course. Thanks for the additional information, as it also helps other Q. What size footings were put in, RLs, contour info .etc BTW, you shouldn't be put in this difficult situation in the first place Just curious I am an engineer while ponzu pretends to be one (humour) Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab for retaining wall: advice needed 12Mar 09, 2023 7:24 am StructuralBIMGuy wayfarer What is engineered is the 700 X 200 slab and the retaining wall details. What I want is to extend it using 500x75 slab towards the house , and taper it, of course. Thanks for the additional information, as it also helps other Q. What size footings were put in, RLs, contour info .etc BTW, you shouldn't be put in this difficult situation in the first place Just curious I am an engineer while ponzu pretends to be one (humour) We've no evidence of bimguys claims either btw. He's a narcissist that likes to put his foot in his mouth 9/10 posts (wish i could say its humour, but is just facts). As an "engineer" he seems to have trouble with simple calculations and basic comprehension. Let me know if you'd like me to fish around for another members post on this for a laugh. Its quite the doozy Re: Slab for retaining wall: advice needed 13Mar 09, 2023 7:26 am wayfarer Ignore him mate, you have bigger issues to solve in hand You can a PM if you choose, lol ponzu jumps onto all my post and put those seeking professional advice off. Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab for retaining wall: advice needed 15Mar 09, 2023 7:31 am ponzutwo StructuralBIMGuy @wayfarer Ignore him mate, you have bigger issues to solve in hand Yes. please ignore me. use the time to search bimguys posts for a laugh Stalker Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab for retaining wall: advice needed 16Mar 09, 2023 7:32 am StructuralBIMGuy ponzutwo StructuralBIMGuy @wayfarer Ignore him mate, you have bigger issues to solve in hand Yes. please ignore me. use the time to search bimguys posts for a laugh Stalker See what i mean about comprehension? Thanks for proving my point BIMbag Re: Slab for retaining wall: advice needed 17Mar 09, 2023 8:06 am wayfarer Height issue. Max height is 1m - can't go higher. Taper from the house at 1:20 drops the slab by 50mm at the retaining wall (this taper is shown on the sketch). An additional taper 1:100 along the length at 3.5 m gives an additional drop of 35 mm. So the total is already 85 mm. More questions That would have been know at the initial design stage when setting the ffls? wayfarer Dropping it down by another 100mm, assuming you're talking about strip drain, will lower the entire wall by 185mm... And your Weep holes will be covered if you followed the certified engineering details... Creating a non compliance issue? Your sketch doesn't include the footing details, providing them will assist wayfarer What is engineered is the 700 X 200 slab and the retaining wall details. What I want is to extend it using 500x75 slab towards the house , and taper it, of course. What was provided is a generic engineering detail, That is now not fit for purpose? More info required Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab for retaining wall: advice needed 18Mar 09, 2023 8:58 am Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Engineering provided a generic dimensions, no offset from house or fence is given... (All shown at the top image ) No rl, just 1m max and three a3 pages of engineering notes...incl Reo to use, blocks, 25mpa vibrated, about core filling the block work, CJ's etc No relationship to the weepholes thought - I have to figure it out myself. I did the math, not sure if I did it right What I would like to have is at the bottom part of the picture. I believe forums are a great source of information. What I am concerned about is the quality of labour, hence want to equip myself with the knowledge. Re: Slab for retaining wall: advice needed 19Mar 10, 2023 9:11 am Since you have paid your engineer for the sketch? (humour) I suggest you go back to him and he can update the correct details for free Here, Ask for data/ proofs and approx. quants How much does a besser block wall cost BTW N12 bars, located in the NA , 75mm slab, insufficient cover, does bugger all to control cracking. Also check out your Council regulations Cheers Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Slab for retaining wall: advice needed 20Mar 10, 2023 9:51 am Thanks for your reply Started to get interesting. The story is: the builder created plans for the house, the retaining wall is by the owner (me). The retaining wall was engineered by an engineering company (separate from the builder). The builder and retaining wall are a part of the same DA. I asked the engineering company to provide offsets from the wall - they responded "talk to your bulder. We provide structural drawings only" The builder says the final position is up to me ... Am I entitled for an architectural drawings for the retaining wall? I thought about cracking where 200 meets 75. Was almost certain it'll crack there. If I continue n12 as an S shape bent into 75mm slab, will it help? More like in the picture below: Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ PS.: I'm a mechanical engineer (machinery), not a structural... Versaloc is a mortarless besser block system that still needs a properly engineered footing. If you just do a 400x200 footing it will fail in time. At 17m long you need it… 1 22328 Can anyone recommend a good/affordable retaining wall and fence builder that I can get a quote from located in Sydney? 8 47921 Thank you again Simeon.. I will call my certifier for that. Have a good day 4 6756 |