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Concrete for shed foundations

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    #32
    Lantus
    Registered Users Posts: 3,027 ✭✭✭Lantus


    vicwatson wrote: »
    Is a plastic sheet necessary for a slab that’ll be outdoors?

    Generally good practice for damp and protection of the concrete. I laid plastic down for my driveway. A little ott but I sleep soundly...


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    #33
    Lumen
    Registered Users Posts: 31,013 ✭✭✭✭Lumen


    The least amount of effort for a shed has to be a deeper meshed slab and minimal ground prep, i.e. remove topsoil, shutter, mesh and pour.

    Digging out subsoil is a right pain in the hole.


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    #34
    148multi
    Registered Users Posts: 1,414 ✭✭✭148multi


    vicwatson wrote: »
    What N needed for this (where no cars etc on it, just a few people) someone said 30 N to me but from what I can see it wouldn’t need that strength ???

    30n would be a minimum strength, adding water to this mix to make it more workable will significantly weaken the mix leaving you with a lower N mix. the type of ground will dictate the dept of foundation, but most will be in the region of 9"-10",a lot of Quarries will have a minimum charge equating to 4 m3, plus a charge for every extra hour the truck is there. In certain circumstances it may be much cheaper to get a crew working local to do the job as they can get an extra m3 or two for a fraction of the cost available to Joe soap. Another option is to collect a dry mix from the quarry yourself, but the shut filling will be high, so two sheets of ply or similar to funnel the mix is essential.


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    #35
    tmabr
    Registered Users Posts: 207 ✭✭tmabr


    Can you buy a ton bag of concrete anywhere. Ready mixed. ?
    Ty


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    #36
    vicwatson
    Registered Users Posts: 28,403 ✭✭✭✭vicwatson


    Lumen wrote: »
    The least amount of effort for a shed has to be a deeper meshed slab and minimal ground prep, i.e. remove topsoil, shutter, mesh and pour.

    Digging out subsoil is a right pain in the hole.

    And the arms and back :-)


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    #37
    Lantus
    Registered Users Posts: 3,027 ✭✭✭Lantus


    Lumen wrote: »
    The least amount of effort for a shed has to be a deeper meshed slab and minimal ground prep, i.e. remove topsoil, shutter, mesh and pour.

    Digging out subsoil is a right pain in the hole.

    Yep. Effort vs cost and of course the ground conditions. If it's well compacted ground then lashing down 150mm with a 10mm mesh would be pretty bomb proof for a small area like this.


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    #38
    148multi
    Registered Users Posts: 1,414 ✭✭✭148multi


    tmabr wrote: »
    Can you buy a ton bag of concrete anywhere. Ready mixed. ?
    Ty

    You can bring a tonne bag to the quarry, but can't leave it, it goes off even when dry.


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    #39
    sgarvan
    Registered Users Posts: 1,606 ✭✭✭sgarvan


    DamoNolan wrote: »
    Can I ask who you got the ready-mixed off?

    Kilsaran
    vicwatson wrote: »
    Was it 30n10 ?


    Included VAT?

    I didnt order it so not 100% sure on the concrete type, I will find ask. I would say it did include VAT.


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