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Shed insulation advice please.

Discussion in 'Building' started by MC76, 5 Mar 2019.

  1. MC76

    MC76

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    Hi all. I'm buying a 10' x 8' T+G wooden shed for the back garden and once built, the shed will sit on top of decking.
    I am planning on using this as a games room with arcade machines in. Because of this I need to insulate it really well so I have a few questions to ask if that's ok.

    1 What sort of insulation is best to use for this job? I am thinking of 50mm or 25mm Kingspan/Cellotex as while expensive it sounds like the best option after doing some research but I'm open to ideas.

    2 The frame in the shed is 50mm x 50mm so if I was to use Kingspan would I be best to use 50mm with plasterboard/ply straight over the top, or would it be best to use 25mm kingspan so I can have an air gap?

    3 What is the best way to insulate the floor?

    I realise arcade machines in a shed isn't the best idea as they don't like cold and moisture which is why I want to do a good job of insulting it in conjunction with running a dehumidifier and heat when needed.

    Thanks in advance for any advice.
     
  2. blup

    blup

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    Don't know about the floor but I think the advice is to put in an air gap if you can't get a vapour barrier under the cladding.

    Blup
     
  3. blup

    blup

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    Meant to say breathable membrane, not vapour barrier which goes on the inner side of the insulation.

    There are plenty of posts on here giving more detailed advice.

    Blup
     
  4. big-all

    big-all

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    keep in mind your restricted to 2.5m above natural ground level the shed covers to avoid the need for planning if near the garden edge so include the ground to deck surface on top off you shed height
    also not a good idea to put any weight on top off decking unless so designed
     
  5. MC76

    MC76

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    Thanks for the advice so far guys.

    Yes It will still be under 2.5m in height after allowing for the decking being raised 4".
    I'm sure the decking will be strong enough but I take the point and will look into strengthening it up to be safe.

    Has anyone else got any advice/answers to my questions? I have looked on the forum and other places but there is so much conflicting information and different opinions it's quite confusing and at least if there are different opinions in this thread I can ask questions without resurrecting old threads.

    Cheers.
     
  6. Ker-plunk

    Ker-plunk

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    Full fill between studs with 50mm insulation followed by 500 guage polythene stapled to the studs...tape any joints followed by either your plasterboard or plywood.
    floor i would lay a breather membrane, joists, insulation between joists, vapour barrier then flooring.
     
  7. MC76

    MC76

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    Thanks for the reply and the picture. I've been away so only just got chance to reply.

    If I'm using something like 50mm Cellotex for the walls, would I need to add polythene over the top or have you used that because you're using a different type of insulation? And would the advice be the same regarding an airgap if using cellotex, would I want one or not?
     
  8. Ker-plunk

    Ker-plunk

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    If you full fill the gap with a rigid insulation and tape the joints you wont need the vcl.

    No air gap.
     
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