Greenhouse - Goodbye Old Friend, Hello New

Discussion in 'Garden Projects and DIY' started by shiney, Oct 25, 2025.

  1. ricky101

    ricky101 Total Gardener

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    We wonder what is beneath those slabs, just soil, or did you use some mortar or some thicker depth of concrete ?

    We know from experience how important a level and square base is even on our smaller greenhouses we have errected over the years.
    They intially go up ok but when all the sides and roof come together you can have all sorts of problems like the glass not fitting.

    With such a big and expensive greenhouse, to ensure the installation goes smoothly it might be worth sending those Base pics to the Installers and see what they say ?

    Thought Robinsons might have the option of a extra strong base kit that is often available on smaller greenhouses which helps overcome uneven areas, but no, they seem to rely on having a perfect base.

    002632.jpg
     
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    • shiney

      shiney President, Grumpy Old Men's Club Staff Member

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      That's the booklet I have from Robinsons but an engineering friend has said that we needn't worry too much about the level of the greenhouse if it seems to be level enough as the installers should have shims to use to sort out small discrepancies. :fingers crossed:

      All we shall do is the one bad slab and then just do some pointing that should stop the paving from moving but we shall keep the pointing below the level of the paving.
       
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      • pete

        pete Growing a bit of this and a bit of that....

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        I think you are in the hands of the installers @shiney, its different if you are doing it yourself, at least you have comeback, if things should go wrong in the future, I dont actually understand the skim idea as its would probably break up after a while anyway, but shims would work as long as its not too far out.

        You can probably get away with a small amount out of level just as long as its out of level on both sides, ie not twisted, it would then be slightly out of plumb but not really noticeable.
         
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          Last edited: Nov 4, 2025
        • shiney

          shiney President, Grumpy Old Men's Club Staff Member

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          Thanks.

          With a greenhouse that size I guess there must be tolerance for a reasonable amount of flexing.
           
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          • pete

            pete Growing a bit of this and a bit of that....

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            You can flex the frame, but not once the glass is in.:biggrin:
             
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            • shiney

              shiney President, Grumpy Old Men's Club Staff Member

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              Yes, and I expect them to have got the frame correct before the glass goes in. They're charging enough for the job! :rolleyespink:
               
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              • CanadianLori

                CanadianLori Total Gardener

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                My greenhouses are small but I, by myself, put them together in one day. I have the luxury of the panels being polycarbonate so very flexible and the framing being solid means you can make adjustments even after they're together. I even pushed one 6 six to a new location!

                Heavens, the way people are talking, you'd think the glass was sugar glass! I'm pretty sure those installers will be highly skilled and experienced. Little "bumps" etc will be handled by them easily and with little fuss.

                @shiney do we get a slide show of the erection? No, not your excitement, the structure going up?
                 
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                • shiney

                  shiney President, Grumpy Old Men's Club Staff Member

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                  If I am not busy I shall take photos. :noidea:
                   
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                  • CanadianLori

                    CanadianLori Total Gardener

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                    Is delivery still on schedule as far as you know?
                     
                  • shiney

                    shiney President, Grumpy Old Men's Club Staff Member

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                    Due today with no notification of change.

                    We did a little bit of adjustment to the base area ((photos later) where there were obvious high or low points. I have contacted the installers to ask them to pop in to check whether it is OK. They said, reluctantly, that they will if they are in the area. It should be in their interest to do so in order to make sure they won't be wasting their time arriving on the booked date and not being able to do the job.
                     
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                    • CanadianLori

                      CanadianLori Total Gardener

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                      :hapfeet::hapydancsmil::hapfeet::hapydancsmil::hapfeet:
                       
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                      • ViewAhead

                        ViewAhead Total Gardener

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                        :blue thumb: Fingers crossed for a successful unload, @shiney.
                         
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                        • shiney

                          shiney President, Grumpy Old Men's Club Staff Member

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                          I dug over the bed that was/will be inside the greenhouse and then covered it with porous membrane
                          upload_2025-11-13_15-18-3.jpeg

                          And pointed and level all down the side on the left
                          upload_2025-11-13_15-18-3.jpeg

                          There was a protruding paving slab that we removed and cemented over
                          upload_2025-11-13_15-19-38.jpeg

                          fixed another corner
                          upload_2025-11-13_15-20-58.jpeg

                          I have told the installers that it would be best if they turned up beforehand to see whether they may need to do more than just packing under the base. It's in their interest to do so as they have set aside a few days in which to do the job.

                          Delivery arrived and the 4mm toughened glass has been stacked against a wall under cover. Some rubber protection has been placed between the glass and wall and it is all stood on wood.
                          upload_2025-11-13_15-26-51.jpeg

                          upload_2025-11-13_15-26-51.jpeg

                          The boxes containing all the metal work have been stacked on the tables under cover of the pergola. They were very heavy.
                          upload_2025-11-13_15-30-7.jpeg

                          upload_2025-11-13_15-30-7.jpeg


                          upload_2025-11-13_15-30-7.jpeg


                          upload_2025-11-13_15-30-7.jpeg

                          Now we have a three week wait for the installers. :noidea:
                           
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                          • CanadianLori

                            CanadianLori Total Gardener

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                            Wow. That's a lot of components. I remember when I put my tiny greenhouses together that it took me almost 2 hours to lay all of the parts out in numerical order so that it would be easier to follow the step by step instructions.

                            They're lucky you have a good place to store them in an orderly fashion.
                             
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                            • shiney

                              shiney President, Grumpy Old Men's Club Staff Member

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                              I'm told that the installers won't need the instruction book that is in one of the boxes as they build these all the time and shall know which is which from the serial number on the box and also by just looking at them.
                               
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