Browse Forums Building Standards; Getting It Right! Re: Protecting your Slab 527Jul 06, 2019 4:30 pm Hi, Great topic! I am building on shale/rock with an M grade slab in Sydney and have a pool that’s 1100mm from the house. Is there still a risk of slab heave? As I am currently planning the concreting around the pool and am wondering whether drainage is required between the pool and house. We are either doing concrete and tiles or pavers and white pebbles. Re: Protecting your Slab 528Jul 06, 2019 5:36 pm no unlikely with that soil profile but you need an engineer to calculate if there is an angle of repose issue.The concrete pavement should drain all the water it catches into the stormwater system which should be done by a plumber and not the concreter. Re: Protecting your Slab 529Jul 30, 2019 4:31 pm brokenstick My house is nearing completion and I am arranging concreting and drainage all the the way around the perimeter. The area below in red will be concreted and drained. Ideally I would like to have lawn right up to the alfresco with subsurface drainage, without a concrete apron around the alfresco as well . Is this a bad idea or should I just concrete the green area (1m wide) as well?? Thanks Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Did you end up concreting footpath around the alfresco (green line as shown). Any chance of showing updated photos for reference as i'd thought of doing same? Any issues of draining behind garage being built to boundary? Thanks.😊 Re: Protecting your Slab 530Aug 06, 2019 3:27 pm chanam brokenstick My house is nearing completion and I am arranging concreting and drainage all the the way around the perimeter. The area below in red will be concreted and drained. Ideally I would like to have lawn right up to the alfresco with subsurface drainage, without a concrete apron around the alfresco as well . Is this a bad idea or should I just concrete the green area (1m wide) as well?? Thanks Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Did you end up concreting footpath around the alfresco (green line as shown). Any chance of showing updated photos for reference as i'd thought of doing same? Any issues of draining behind garage being built to boundary? Thanks.😊 Yes we did, pic below. The concreter drilled into the side of the slab and put some dowels in to tie it together. We will paving it and the alfresco in one continuous lot, and doing the lawn at the same level. Had to slope is down slightly to the right to tie in with with the concrete at the side (instead of having a small step) Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Protecting your Slab 531Aug 06, 2019 7:01 pm brokenstick chanam brokenstick My house is nearing completion and I am arranging concreting and drainage all the the way around the perimeter. The area below in red will be concreted and drained. Ideally I would like to have lawn right up to the alfresco with subsurface drainage, without a concrete apron around the alfresco as well . Is this a bad idea or should I just concrete the green area (1m wide) as well?? Thanks Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Did you end up concreting footpath around the alfresco (green line as shown). Any chance of showing updated photos for reference as i'd thought of doing same? Any issues of draining behind garage being built to boundary? Thanks.😊 Yes we did, pic below. The concreter drilled into the side of the slab and put some dowels in to tie it together. We will paving it and the alfresco in one continuous lot, and doing the lawn at the same level. Had to slope is down slightly to the right to tie in with with the concrete at the side (instead of having a small step) Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Does it slope away 70mm for the 1st meter? Re: Protecting your Slab 532Sep 10, 2019 9:29 pm Doesn't need to if it's concrete. Only 50mm to 70mm over 1 metre if it's natural ie soil/ grass. Read your engineering, somewhere it will mention slope for hard constructed surface, usually 25mm over 1 m. Cheers Re: Protecting your Slab 533Sep 10, 2019 10:34 pm sweetswisssteel Doesn't need to if it's concrete. Only 50mm to 70mm over 1 metre if it's natural ie soil/ grass. Read your engineering, somewhere it will mention slope for hard constructed surface, usually 25mm over 1 m. Cheers I addressed the above by posting the regulations in this thread on March 19. viewtopic.php?p=1840640#p1840640 3in1 Supadiverta. Rainwater Harvesting Best Practice using syphonic drainage. Cleaner Neater Smarter Cheaper Supa Gutter Pumper. A low cost syphonic eaves gutter overflow solution. Re: Protecting your Slab 535Apr 01, 2020 10:35 pm Take photos every day you have ponding of water and email to your builder every day and remind them of their responsibility to adequately drain and protect the foundation during the build. Tell them that you will hold them personally responsible for any issues you have from slab heave etc in the future. Re: Protecting your Slab 536Apr 02, 2020 6:32 am stevenboh Send a letter via registered mail to the general manager of the builder that explains the situation with dated photos. Reference the exact clause in your contract that says they are responsible for site drainage and ask them to take immediate action to install a temporary agricultural drain in the affected area. Point out if they don't do this they are breaching the building contract. Send a PDF of this letter to your SS, the coordinator and the GM by email. Give the builder notice and a fair opportunity to fulfil their contractual obligation. Re: Protecting your Slab 537Apr 02, 2020 7:14 am Thank alot guys, It appears in the contract that I may have to look after the surface drainage : Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ If the builders say that the drainage isn't their problem I may ask the SS if I can have the site handed over to me, as I engage landscapers to build in some drainage Re: Protecting your Slab 538Apr 02, 2020 7:51 am I think that clause refers to the situation after handover, not during the build because the builder is responsible for the site. However, you will need to organise good drainage along the side anyway and probably its better to manage this so its done properly - not a sloppy, temporary fix by the builder to get a few photos for 'evidence'. Re: Protecting your Slab 539Apr 02, 2020 8:49 am stevenboh Hi StevenBoh Thanks for the photos...but photos alone are not enough as you will need data reference points I recommend you now start taking slab movement measurements these will relate to any future cracking that may occur...best to be prepared BTW, your builder is responsible for your site during the build he has possession Cheers Chris Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Protecting your Slab 540Apr 02, 2020 4:06 pm stevenboh Thank alot guys, It appears in the contract that I may have to look after the surface drainage : Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ If the builders say that the drainage isn't their problem I may ask the SS if I can have the site handed over to me, as I engage landscapers to build in some drainage It is a requirement in the Australian standards that the builder is responsible for drainage during construction and not to cause abnormal moisture conditions. They have clearly breached the requirements and are responsible for issues relating to abnormal moisture conditions created by them. What is your site classification ? Thanks for the insights, that makes perfect sense, and yeah, I will be leaning on the experience of the excavator operator entirely. 6 16159 4 6201 The concreter will take and reuse. In my case I bought structural LVLs and scraped them back and used them as joists. 1 5160 |