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Concrete footing/quantities advice

  • 19-07-2019 9:41am
    #1
    [Deleted User]
    Posts: 7,499 ✭✭✭


    Starting a nice little project next weekend.
    Its a dwarf wall greenhouse 2.5m x 4.3 (8x14feet).
    It will sit on a single skin brick wall 500mm high.

    For the footing i'm going to go 200mm wide and 150mm deep.
    Is this enough ?,
    I have a barrow full of old wall tiles+roof tiles to throw in the footing,
    Do I need rebar?

    I used an online calculator and it tells me I need just over .4m3 of concrete. C20 mix.

    134kg of cement
    250kg of sand
    500kg of gravel

    Does this sound right ?I dont want to order too much but I need extra sand and cement for the block work mortar.

    Any other advice for me ?
    Thanks


Comments

  • #2
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,566 ✭✭✭✭Calahonda52


    What depth are you going down? eg frost heave
    What is the ground like?
    What width are the bricks?
    200, ie 8 ", wide is too miserable, ie 6" is too thin: this is the real world, not adult lego :)

    you wont get 0.4m3 delivered at a reasonable price

    “I can’t pay my staff or mortgage with instagram likes”.



  • #3
    [Deleted User]
    Posts: 7,499 ✭✭✭ [Deleted User]


    Calahonda52 wrote: »
    What depth are you going down? eg frost heave
    What is the ground like?
    What width are the bricks?
    200, ie 8 ", wide is too miserable, ie 6" is too thin: this is the real world, not adult lego :)

    you wont get 0.4m3 delivered at a reasonable price

    solid ground.
    Bricks are standard width red bricks 115mm or so.
    Going to mix the concrete myself with a mixer.

    What do recommend so ?

    Edit-good site here for diyers like myself.
    http://www.pavingexpert.com/featur03.htm

    Looks like 300mm wide and 200mm deep is recommended ,


  • #4
    bfclancy
    Registered Users, Registered Users 2 Posts: 181 ✭✭bfclancy


    BrownFinger wrote: »
    solid ground.
    Bricks are standard width red bricks 115mm or so.
    Going to mix the concrete myself with a mixer.

    What do recommend so ?

    Edit-good site here for diyers like myself.
    http://www.pavingexpert.com/featur03.htm

    Looks like 300mm wide and 200mm deep is recommended ,

    Go with 300 by 200 be plenty for a single skin. Red bricks are crap for fixing to so try and use solid red bricks with frogs rather than holes or else go for a stock brick


  • #5
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,566 ✭✭✭✭Calahonda52


    300 by 200, with top 150 minimum down with a bit of rebar will work.
    Don't know about the single brick wall, 500 high with no piers.
    I am building one later this summer and will use 4" solid concrete block on the flat: much more stable, very quick to lay and plenty to tie my glasshouse to

    “I can’t pay my staff or mortgage with instagram likes”.



  • #6
    policarp
    Registered Users, Registered Users 2 Posts: 3,664 ✭✭✭policarp


    Depends on where you are.
    Some areas only need a small cutting to meet the marl.
    Others have to dig a bit deeper.
    But the general rule of thumb is 3 times the wall size.
    So if you have a 100 mm. wall, then foundations should be
    300 mm.


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