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  • Raised Greenhouse 'Floor' - Material?

    Hi Folks,

    My greenhouse has *finally* been installed (supplied and fitted as part of my allotment tenancy). Because it was supplied by the landlord, and included in the cost of the allotment, I unfortunately haven't had any say in which greenhouse we got, or the type of base laid (we've all been given identical ones).

    The base is slightly unusual (and, according to the greenhouse fitters, not something they would usually expect). The base is essentially a perimeter of half flags on which the greenhouse has been fitted. It all seems solid enough, however the way they've done it means I'm losing a foot in length inside - see picture;



    The greenhouse itself is 8x6, but the floor area, excluding the slabs, is only 210cm in length. The 'sandy'/'stone' bit in the middle isn't completely level either, so I should be able to level that out easily enough.

    I want to maximise the space available, and obviously most staging is sized to make up a length of 240cm (I'm planning to buy Clearspan staging from TwoWests).

    So, I want to try to use this as an opportunity to gain a little extra working height - most potting benches I've seen are a bit low for my liking, so hopefully the extra height will make it more comfortable to work with.

    My plan is - either side of the door, lay timber/chipboard or similar the full length - 2.4m x 0.6 - that will leave me with a central 'path' in the middle just slightly wider than the door. The 'floor' is currently 10cm lower than the flags, though I will add some gravel or similar on the path to 'firm it up' a bit.

    So, my question is - what is the best material to use to accomplish this? The cheapest option is to use P5 Chipboard flooring, which works out at £10 a sheet (so £20 total). This is moisture-resistant, but obviously not waterproof. However, I will be using matting throughout, rather than a watering can, so in theory it shouldn't be exposure to too much water. To be totally sure, I could give it a coat of Yacht varnish?

    The second option is to use decking, but I'd need 5 planks on either side, so it costs twice as much - plus I'd need to assemble some sort of frame for them to sit on (and my DIY skills are *very* limited). Either way, I'll need to have materials delivered as 2.4m won't fit in my car!

    Advice/Tips/Alternatives most welcome!
    Attached Files

  • #2
    Could you use half flags wherever the legs of the staging will be?
    Depends on how you plan to use the GH?
    I have staging with removable trays on top, and grow lettuce etc beneath it. When I grow taller things like toms and cues, I remove the trays.

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    • #3
      Personally I'd get a few more flags off Gumtree or similar for free, and lay them down one side to make a solid path and floor on which to put your staging. The other half I would leave as it is, i.e. have a soil bed you can plant straight into. Yes, the way it has been done is awkward, but I think having access to the soil beneath could be a bonus. Tomatoes grown straight into the soil rather than pots/growbags are so much easier to keep evenly watered.

      Tip: If you want to buy decking, just open your car's front door passenger window, and have them sticking out... just drive carefully!
      He-Pep!

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      • #4
        okay...let me get this straight in my head....

        you aren't planting into the greenhouse floor either side.
        you are putting wood? down either side...and leaving soil in the middle bit? No, sorry...re-read it, you're putting gravel down the middle.

        My first thought is how much slugs will enjoy snuggling under your nice damp wood floor.

        My second thought is that you are over engineering this project!
        If you aren't planting in the floor, why have different materials at all?
        You could just have gravel all through. Pots are really very stable on gravel, condensation just soaks on through and you can easily pull up any weeds that poke up.
        It won't stop slugs...but it won't encourage them either.
        It's cheap, and can be topped up as and when needed.
        http://goneplotterin.blogspot.co.uk/

        Comment


        • #5
          Sorry, I should have clarified;

          - The 'empty' floor isn't soil - there a sand/stone aggregate mix on the floor - hence adding gravel for the path.

          - The intention is to have staging covering the full length of one side, and half staging on the other, along with a potting bench. If I don't somehow 'level' the full length, then I'll lose 15cm either end because of the flags.

          - Whilst I could just put pots on the ground, ideally I want to make the most of the space - so with the clearspan staging I'll have 2 levels, with the top being removable if needed. So, for example, I can put a grow bag on the bottom shelf and use the top shelf for other stuff until whatever is in the grow bag needs the extra height.

          - Flags are not an option due their weight unfortunately (for various reasons I can't handle anything too heavy)

          - In theory, the 'easiest' option would be to simply fill it with gravel, however it would take a fair amount of gravel (3.36sqm @ 10cm deep) and I'm not convinced it would be stable enough (happy to be proved wrong though!)

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          • #6
            I should also add that I don't have a shed - we were given the option of either a shed or greenhouse, but not both. So the greenhouse will also serve as storage for tools, feeds etc too - hence wanting the maximum storage space.

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            • #7
              So if you want the extra height given by the slabs why not just use a couple of bricks under any unsupported legs of the staging?

              New all singing all dancing blog - Jasons Jungle

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              ― Thomas A. Edison

              �Negative results are just what I want. They�re just as valuable to me as positive results. I can never find the thing that does the job best until I find the ones that don�t.�
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              - I must be a Nutter,VC says so -

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              • #8
                I have my staging built up on house bricks ^^ works fine. I also thought I could grow under it although this foes work during the early months of the growing season I find come July when everything has Put on a lot if growth underneath the staging is quite dark.

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                • #9
                  Originally posted by Jay-ell View Post
                  So if you want the extra height given by the slabs why not just use a couple of bricks under any unsupported legs of the staging?
                  Mainly stability that I would be worried about with doing that

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                  • #10
                    Well I'm the worst DIYer ever and I've not had any problems. I also sit large 4ft black trays across mine to water my plants from the bottom so it has to be pretty flat. They work a treat and you've no worry about making them waterproof and aren't expensive either

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                    • #11
                      Originally posted by Scarlet View Post
                      Well I'm the worst DIYer ever and I've not had any problems. I also sit large 4ft black trays across mine to water my plants from the bottom so it has to be pretty flat. They work a treat and you've no worry about making them waterproof and aren't expensive either
                      Do you have them just 'loose' or cemented in?

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                      • #12
                        Loose .

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                        • #13
                          Originally posted by Scarlet View Post
                          Loose .
                          Ok, thanks - I'll take a look at how feasible that would be :-)

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                          • #14
                            Have a look at the photos in http://www.growfruitandveg.co.uk/gra...oor_59779.html
                            You may find an idea to copy
                            Don't worry too much about it this year. You can always move staging etc around next year if your layout doesn't work.

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                            • #15
                              Oh, thanks - that's my evenings reading sorted!

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