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Thread: Allotment greenhouse build options & considerations

  1. #1
    Forage420's Avatar
    Forage420 is offline Seedling
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    Default Allotment greenhouse build options & considerations

    Hi everyone,

    I'm looking for some advice about a greenhouse base which I need to build. Kindly I am having one donated. The size of the external sizes of the greenhouse base you see in the photos are 2metres x 2.67metres corner to corner. I would like to build a foundation for my greenhouse exactly like this one in the photos.

    The width is 4inches (100m).
    Attached Thumbnails Attached Thumbnails Allotment greenhouse build options & considerations-img_20190110_091449408.jpg   Allotment greenhouse build options & considerations-img_20190110_085402220.jpg   Allotment greenhouse build options & considerations-img_20190110_085350866.jpg  

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    Forage420's Avatar
    Forage420 is offline Seedling
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    These are close up photos of the foundations. As you can see if I have exposed some earth and stuck a trowel in underneath, and it feels as though there is bare earth.

    The depth is 12 inches at max + 1-2 inches of concrete below ground, as per the photos...
    Attached Thumbnails Attached Thumbnails Allotment greenhouse build options & considerations-img_20190110_091325593.jpg   Allotment greenhouse build options & considerations-img_20190110_091249349.jpg   Allotment greenhouse build options & considerations-img_20190110_091253511.jpg   Allotment greenhouse build options & considerations-img_20190110_091257027.jpg   Allotment greenhouse build options & considerations-img_20190110_085436651.jpg  


  3. #3
    bario1's Avatar
    bario1 is offline Work in progress...
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    Hi Forage, I've moved your thread to the 'Undercover Operations' section.
    Nicos likes this.
    He-Pep!

  4. #4
    Forage420's Avatar
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    Key considerations


    How should I build the form work for the foundation?



    What concrete mix should I use? i.e. how much sand/cement/water ratio?



    Do I need to fit rebar/mesh ?




    What other considerations are there ?
    Last edited by Forage420; 10-01-2019 at 10:48 AM.

  5. #5
    Doncasterpaul is offline Seedling
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    If it’s a simple repair job probably 4 sand to one cement. If it’s a complete new base a 6-1 will be fine. But use a sand and stone (ballast) mix instead of just sand. With regards to water it is a case of just add it until the mix looks right
    Forage420 likes this.

  6. #6
    lottie dolly's Avatar
    lottie dolly is offline Gardening Guru
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    does it have to be a base so thick,you could do the job a lot easier/cheaper and quicker,useing concret edgings,or some slabs cut up,maybe worth hiring a machine to do the cutting,unles you already have a grinder,
    to add,mine stands on bare ground and is fine,if you are woried about the winds,it can still be drilled and pluged into the slab,also nothing wrong with putting a little cement mix to bed the slabbs on,
    Last edited by lottie dolly; 10-01-2019 at 03:48 PM.
    Another nutter ,wife,mother, nan and nanan,love my growing places,seed collection and sharing,also one of these

  7. #7
    Chris Hulme is offline Seedling
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    Hi.
    Dig down as far as the one you're trying to replicate.
    Then use ply wood to build the shape you want (shuttering). Pour concrete into the shape/mould you've made. 6 ballast (sharp sand, gravel mixed) to 1 cement. You can buy bags of ballast for wickes etc. Once the concrete has hardened removed the ply wood and you should have your base.

  8. #8
    Chris Hulme is offline Seedling
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    You could also use concrete blocks and build a one block high wall. Dig a trench and lay the blocks on a bed of sand and cement (building sand)
    Nicos, SarrissUK and Forage420 like this.

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