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Anchoring a greenhouse on a flat roof?

I currently live in a first floor flat and have a concrete flat roof as my garden. I am very much in to growing chilli and tomato plants, this year I decided to buy one of those small walk in pop up greenhouses but it's just not big enough for my needs.

I would like to buy a 6x8ft poly greenhouse but I am struggling to find any information online as to the best way I could anchor it. (I obviously can't drill in to the roof)

At the minute, from what I've seen, I'm thinking a rectangle of paving slabs under the base of the greenhouse. I've read that gorilla glue can be used to glue the slabs together and works extremely well, then drill in to the slabs and use a standard concrete anchoring kit. In my head this seems like a suitable solid foundation for it but I literally have no idea, this is my first ever greenhouse.

I would love to hear if anyone else has any comments or suggestions?


  • lalix89lalix89 Posts: 3

    Excellent! Thank you for your reply. I was worried I wasn't going to be able to do it on a roof but I can now confidently buy the greenhouse I've been looking at for a couple weeks now.

    Thanks again for your advice image

  • IamweedyIamweedy Posts: 1,364

    I think you need to think very carefully about this.

    Do you own the flat?

    Whereabouts do you live? How exposed is your flat  to prevailing winds etc?

    I would be very wary of attaching a polycarbonate type of greenhouse to any rooftop. I don't think it would be long before it would take off in a high wind. If it does not actually take off,  the materials it is made of could twist and tear. If it did blow off it could cause damage to other peoples property. 

    My garden is relatively sheltered but  untethered wheelie bins can blow over behind my garden shed.

    'You must have some bread with it me duck!'

  • lalix89lalix89 Posts: 3

    Thank you for your concern but I'm pretty sure I should be OK.

    I don't own the flat but I rent it from my employer and they are aware of my intentions of buying a greenhouse. The only damage to other property that would be caused should it take off would be their property since I live next door to my place of work and there are large walls covering the other directions.

    As I said in my previous post I currently have one of those flimsy pop up greenhouses and have managed to keep that on the roof and in one piece through some pretty gusty conditions. I did manage to find 4 anchor points for guy wires on the pop up greenhouse, I assumed it wouldn't be necessary for a poly greenhouse with concrete slab base but if you think it would be best then I'm sure I could find 4 suitable anchor points for that also.

    Last edited: 28 June 2017 06:33:55

  • KT53KT53 Posts: 8,458

    I would be surprised if your employer has given any great thought to how you plan to secure your greenhouse, even if they haven't raised any objections to the idea of you having one.  It would still be sensible to speak to them about how you are planning to secure it or there is the potential to be hit with a very large bill for removal of slabs and repairs to the roof if you leave their employ.

  • IamweedyIamweedy Posts: 1,364

    "We are not in Kansas anymore Toto! "  image

    'You must have some bread with it me duck!'

  • IamweedyIamweedy Posts: 1,364

    We had just moved up North  from Ilford in the late August of 1987 when the storm hit in October. There was very little damage at all in Cheshire. 

    'You must have some bread with it me duck!'

  • LoxleyLoxley Posts: 5,399

    Any walls you could fix a lean-to greenshouse to?

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