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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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floor slab mix / reinforcement
I'm now ready to pour my floor slab. 5 inch thick slab over 3 inch
kingspan. I'm getting readymix pumped to the site. What mix should I ask for (C20, ST4 etc) ? Also, will I need reinforcment in this (fibres, steel mesh reinforcement) ? Thanks, Simon. |
#2
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floor slab mix / reinforcement
sm_jamieson wrote:
I'm now ready to pour my floor slab. 5 inch thick slab over 3 inch kingspan. I'm getting readymix pumped to the site. What mix should I ask for (C20, ST4 etc) ? Also, will I need reinforcment in this (fibres, steel mesh reinforcement) ? If you don't tell us what you intend to put (or build) on this slab, how can anyone possibly tell you what you need? |
#3
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floor slab mix / reinforcement
Bruce wrote:
sm_jamieson wrote: I'm now ready to pour my floor slab. 5 inch thick slab over 3 inch kingspan. I'm getting readymix pumped to the site. What mix should I ask for (C20, ST4 etc) ? Also, will I need reinforcment in this (fibres, steel mesh reinforcement) ? If you don't tell us what you intend to put (or build) on this slab, how can anyone possibly tell you what you need? It's a floor, hence the subject title of 'floor slab', coupled with the opening line: 'I'm now ready to pour my floor slab.' HTH 1) If he was building on it, it would require footings, even for an internal wall, ergo it wouldn't be a floor slab. 2) What kind of things do people normally put in extensions? My guess is either a bathroom or a kitchen, possibly a bedroom, so the heaviest thing it's likely to hold up is a washing machine. To the OP, no you don't need reinforcement, nor fibrin. When you ring to ask for premixed, they will ask you what it's for and deliver the correct mix, or if you decide to mix it yourself, a standard 6:3:1 mix is more than strong enough |
#4
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floor slab mix / reinforcement
On 20 Aug, 16:59, Bruce wrote:
sm_jamieson wrote: I'm now ready to pour my floor slab. 5 inch thick slab over 3 inch kingspan. I'm getting readymix pumped to the site. What mix should I ask for (C20, ST4 etc) ? Also, will I need reinforcment in this (fibres, steel mesh reinforcement) ? If you don't tell us what you intend to put (or build) on this slab, how can anyone possibly tell you what you need? Oh sorry, its easy to forget not everyone else knows what you are up to !! Its the floor slab of the extension I am building. Slab on top of 75mm kingspan, with 25mm kingspan up the sides. Thanks, Simon. |
#5
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floor slab mix / reinforcement
"Phil L" wrote:
It's a floor, hence the subject title of 'floor slab', coupled with the opening line: 'I'm now ready to pour my floor slab.' HTH 1) If he was building on it, it would require footings, even for an internal wall, ergo it wouldn't be a floor slab. 2) What kind of things do people normally put in extensions? My guess You shouldn't have to guess, which was my point. |
#6
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floor slab mix / reinforcement
sm_jamieson wrote:
On 20 Aug, 16:59, Bruce wrote: sm_jamieson wrote: I'm now ready to pour my floor slab. 5 inch thick slab over 3 inch kingspan. I'm getting readymix pumped to the site. What mix should I ask for (C20, ST4 etc) ? Also, will I need reinforcment in this (fibres, steel mesh reinforcement) ? If you don't tell us what you intend to put (or build) on this slab, how can anyone possibly tell you what you need? Oh sorry, its easy to forget not everyone else knows what you are up to !! Its the floor slab of the extension I am building. Slab on top of 75mm kingspan, with 25mm kingspan up the sides. No need for mesh reinforcement as it isn't loadbearing. Adding fibres might help to distribute future shrinkage of the slab into a myriad of tiny harmless cracks rather than a small number of wider ones, but they are not essential. If you tell the readymix company what the concrete is for, they will recommend a mix, or a choice of mixes. They will also offer admixtures that help make compacting and finishing easier. |
#7
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floor slab mix / reinforcement
On 20 Aug, 17:40, Bruce wrote:
sm_jamieson wrote: On 20 Aug, 16:59, Bruce wrote: sm_jamieson wrote: I'm now ready to pour my floor slab. 5 inch thick slab over 3 inch kingspan. I'm getting readymix pumped to the site. What mix should I ask for (C20, ST4 etc) ? Also, will I need reinforcment in this (fibres, steel mesh reinforcement) ? If you don't tell us what you intend to put (or build) on this slab, how can anyone possibly tell you what you need? Oh sorry, its easy to forget not everyone else knows what you are up to !! Its the floor slab of the extension I am building. Slab on top of 75mm kingspan, with 25mm kingspan up the sides. No need for mesh reinforcement as it isn't loadbearing. Addingfibres might help to distribute future shrinkage of the slab into a myriad of tiny harmless cracks rather than a small number of wider ones, but they are not essential. If you tell the readymix company what theconcreteis for, they will recommend a mix, or a choice of mixes. They will also offer admixtures that help make compacting and finishing easier. Thanks. Its to have a screed over later (when levelling up to rest of the house), so a fine finish is not required. I assume stamping around in it a bit and tamping as usual with a long bit of wood will be enough to compact it ? Someone will suggest a vibrating poker I'm sure but thats got to be overkill for a slab. Simon. |
#8
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floor slab mix / reinforcement
sm_jamieson wrote:
On 20 Aug, 17:40, Bruce wrote: sm_jamieson wrote: Oh sorry, its easy to forget not everyone else knows what you are up to !! Its the floor slab of the extension I am building. Slab on top of 75mm kingspan, with 25mm kingspan up the sides. No need for mesh reinforcement as it isn't loadbearing. Addingfibres might help to distribute future shrinkage of the slab into a myriad of tiny harmless cracks rather than a small number of wider ones, but they are not essential. If you tell the readymix company what theconcreteis for, they will recommend a mix, or a choice of mixes. They will also offer admixtures that help make compacting and finishing easier. Thanks. Its to have a screed over later (when levelling up to rest of the house), so a fine finish is not required. I assume stamping around in it a bit and tamping as usual with a long bit of wood will be enough to compact it ? Someone will suggest a vibrating poker I'm sure but thats got to be overkill for a slab. If you ask the readymix supplier to tell you what admixtures are available, one will be a super-plasticiser that makes the mix effectively self-compacting. You just need to screed it off to the finished level. |
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