Browse Forums Renovation + Home Improvement 1 Jun 18, 2017 4:14 pm Hi All, I have a really challenging situation with my outdoor patio/terrace area, which adjoins my indoor area via bifold doors. It is a floating concrete slab which is also the roof of the garage underneath. The slab has sagged and cracked over the years. It pools water and is quite unsightly. This is the area that I really want to make the showpiece of my home, with a good opportunity for a nice, elevated indoor/outdoor area. The challenge I have is both that the slab is structurally not great, leaks water through to the garage below and looks poor. Unfortunately, the height in the garage below is only 1.90m, as I would have liked to knock the whole thing down and replace with a timber/steel framed floor, but that requires a much 'thicker' structure that the clearance wont allow. Likewise, the sill of the bifold door is only 5mm above the height of the slab, so a structure that finishes higher is also not possible. I've had a concrete grinding quote or two done, but they say they cant get grind enough to overcome the sag/pooling water. Does anyone have any ideas what I can do? Any experience with floating slabs like this - either repair or replacement? I think I may need a structural engineer to look at it but really unsure. Thanks for any help of advice. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ [/url] Re: Terrace/Floating Concrete Slab - Help needed 2Jun 22, 2017 7:27 am speck if you want better advice you need to provide better photos & Info... ie. Photos of the support walls/structure beneath, the slab crack, types, sizes & locations,etc Grinding the slab isn't recommended unless you have the engineering details & specs I would highly advise you to find an engineer that does structural repairs, removals and replacements all in one service they should explain the processors & associated cost.. generally 3-5 times the cost (Labour, time & plant) of putting it up Unfortunately I am in Perth..but happy to answer questions Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Re: Terrace/Floating Concrete Slab - Help needed 3Jun 25, 2017 12:50 pm Thank you for the reply @StructuralBIMGuy I've attached some more photos, hopefully they help. Finding an engineer for this and another issue I have with cracked wall at rear has been so difficult, as no one seems to want to come out to actually look at it. Maybe its not worth their while. The slab is 4m x 9m. It is 130mm thick. The slab sits atop double brick walls that form the external wall of the garage on the property border and seemingly the foundations for the floor of the house where the slab adjoins the house. At the rear of the slab it also sits atop brickwork. There is no bracing or anything beneath, just the reinforced concrete slab sitting on the walls, sagging in the middle. 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 ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Terrace/Floating Concrete Slab - Help needed 4Jun 26, 2017 10:29 am Speck Thanks for the photos You will need to get the engineering reinforcement details from the Council and have an engineer check them properly At a glance I would say the planters are a problem from what i can see in the photo they cantilever over the support? ,,if so the cracks above the wall may be hogging cracks.. Please have it checked out Designer,Engineer (Civil,Const & Envir),Builder,Concrete & Masonry Contract.Struct Repairs Thanks Simon, I guess I'm no concerned with the volume of the noise rather that dead and hollow sound and feel that is associated with floating floors. But I'm not sure… 3 6164 Thanks, that's the motivation I needed to give it a try sooner rather than one day! 4 3017 To put anything over slate you will need to put self level compound over the entire area as slate various in thickness and is very un even. To install most types of… 1 418 |