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Thread: Allotment greenhouse build options & considerations

  1. #9
    SarrissUK's Avatar
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    Quote Originally Posted by Chris Hulme View Post
    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)
    I agree with that - greenhouses are always just a little too low along the lowest part of the roof. Raising it up a bit allows much more height on plants
    Nicos and Forage420 like this.

  2. #10
    Chris Hulme is offline Seedling
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    Or build the blocks to suit your height.
    Mine is on a 3 high block wall, which was luckily already there when I took over the garden. Just pulled the old greenhouse down above the wall and built on top again.
    Attached Thumbnails Attached Thumbnails Allotment greenhouse build options & considerations-20160418_192005-1008x756.jpg   Allotment greenhouse build options & considerations-20160510_190109-1008x76.jpg  

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    It is going to be easier to do a block wall than tying to shutter with boards. You'll have more opportunity to correct any errors in square, plumb and levels. You could use brick if you like.

  4. #12
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    I built a breeze block base for a greenhouse last year. Best way is to erect the greenhouse, set up all four corners with blocks and level to suit your greenhouse size then simply fill in the gaps with breeze blocks levelling as you go.

    A mortar bed of a couple of inches below breeze blocks should suffice.
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    Thanks a lot.


    So what I think I'll do is dig out each corner as per Snadger's method, and pour in a few inches of ballast/cement mix that Doncasterpaul & Chris Hulme specify (6:1).


    I'll do one corner first and work from one to the other levelling as I go.


    The last stage would be infilling the perimeter with blocks, but could I get away with using just compacted ballast or would it need cement ?


    I'm trying to avoid using too much concrete in the foundation as the committee will have something to say about it.


    Lastly, to save on cost, could I get away with using postcrete at the corners instead of ballast/cement mix ?
    Attached Thumbnails Attached Thumbnails Allotment greenhouse build options & considerations-stage-2.jpg   Allotment greenhouse build options & considerations-stage-1.jpg  

  6. #14
    Chris Hulme is offline Seedling
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    Don't use ballast, ballast is for concreting.
    Use building sand and cement 4:1
    You don't need a concrete foundation, just lay the mortar (sand and cement) in your dug out trench and put your blocks straight onto the mortar.

  7. #15
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    Thanks again Chris,

    Lastly, are those concrete blocks or breeze blocks in the photo? Is there a reason to use one over the other?

    In your photos there's a mortar joint in between each block, is this easy for someone like me to do who has no skill or special tools in this area? I've never laid brick or block, but I do a fair amount of carpentry and other DIY related jobs.

    Also, just to clarify, are we talking a good few inches of mortar, or just a splodge underneath each block ?
    Last edited by Forage420; 11-01-2019 at 04:57 PM.

  8. #16
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    I'd lay a line of mortar in a rectangle the shape of the greenhouse base. It must be fairly firm so that it doesn't just run out the sides when you put the blocks in. I find that it's easier to maintain level that way.

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