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Thread: insulating polytunnel?

  1. #1
    SelkirkAlex is offline Seedling
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    Default insulating polytunnel?

    I have seen various ideas to thermally insulate polytunnels, the most popular seems to involve lining the inner surfaces with bubble wrap.

    is there any real point / advantage to this?

    my tunnel has an electric greenhouse heater that comes on at 2C, so last winter my tunnel hovered just above zero at night. I had pretty much accepted that for where I live.

    active heating is jut too expensive and pointless given the lack of sun.

    does passive insulation offer any benefits better than what I already have?

  2. #2
    Small pumpkin's Avatar
    Small pumpkin is offline Gone Fishing
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    Tricky one that. Personally I've never tried. I can't work out a good balance between insulating and light. If you insulate for warmth you're probably going to block out a considerable amount of light which due to our location is at that time of year very limited anyway.
    I find the best thing is not do any gardening in winter . I'm probably not living in the best location to be a fair weather gardener.
    bramble, Snoop Puss and Baldy like this.

  3. #3
    SelkirkAlex is offline Seedling
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    is there such a thing as fair weather in scotland?
    bario1, Small pumpkin and Baldy like this.

  4. #4
    chris_m is offline Seedling
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    Quote Originally Posted by SelkirkAlex View Post
    is there such a thing as fair weather in scotland?
    Yes, it's when the rain is just coming straight down instead of sideways
    All the best from rural South Cumbria
    Chris

  5. #5
    roitelet's Avatar
    roitelet is offline Early Fruiter
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    I've tried to insulate with bubble wrap and the main problem is fixing it in the tunnel. Tried all sorts but whatever I tried was a pain. This year I am considering constructing a tunnel within the tunnel. I'm thinking along the lines of uprights with flexible pipe on the top to give a roof covered with either bubble wrap or thick fleece. That way I will be able to create an airspace between the inner and outer layer. I have a gas heater which will only heat the inner tunnel. I only use the heater from about the end of Feb until May or when it warms up enough.

    My tunnel is 3 x 6 mètres and I envisage the inner tunnel to be about 1 x 4 mètres that way I will be able to access all round the inside one.
    Gardening requires a lot of water - most of it in the form of perspiration. Lou Erickson, critic and poet

  6. #6
    SelkirkAlex is offline Seedling
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    what will the effects be? are there any practical benefits in growing?

  7. #7
    DannyK is offline Rooter
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    This might be interesting. I remembered he's spoken about double tunnels on GQT.
    Double polytunnels; grow tropical fruit & veg.. at home | Bob Flowerdew
    Last edited by DannyK; 13-09-2017 at 12:46 PM.
    Snadger likes this.

  8. #8
    bramble's Avatar
    bramble is offline Mature Fruiter
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    Its not just about keeping your tunnel heated. Its about the light levels.
    Without sunlight and brightness nothing will thrive no matter how high the temp is.

    And when your back stops aching,
    And your hands begin to harden.
    You will find yourself a partner,
    In the glory of the garden.

    Rudyard Kipling.

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