Shed insulation help.

Discussion in 'Builders' Talk' started by mayrp2001, Apr 20, 2021.

  1. mayrp2001

    mayrp2001 New Member


    I was hoping someone could help me out. I recently bought a 10x6 shed and I am wanting to insulate it to make it nicer to work in during the colder months. My plan was to put rockwool inbetween the joists and then cover with 9mm Plywood.

    However I have been reading up on this and i am seeing people mention breathable membrane and I am wondering if this would be necessary for me and If so would I just staple it to the joists and cladding? Do i leave an air gap? If I was to use foil backed bubble wrap for example would I still need a breather membrane.

    Also once I out insulation into the walls would I need to cover it with a vapour barrier before putting on the plywood?

    Thanks for your help,

  2. rogerk101

    rogerk101 Screwfix Select

    You need vapour barrier on the warm side of the insulation and breathable membrane on the cold side.
    The vapour barrier reduces the amount of warm moist air that can get into the insulation where it would condense and reduce the efficiency of the insulation.
    The breathable membrane allows whatever moisture that does find its way into the insulation to escape into the atmosphere.
  3. mayrp2001

    mayrp2001 New Member

    That's great tha ks for the reply. Do you feel that all these steps would be necessary for a shed. It isn't somewhere that I will be in every day, but will be working in the odd time and storing tools.
  4. rogerk101

    rogerk101 Screwfix Select

    In many situations insulating is environmentally friendly, like when you're warming a living space that you will be using for a lot of time.
    In other situations it's actually NOT environmentally friendly to insulate a building or a shed, in that it consumes more energy and resources to mine/extract the raw materials, purify them, transport them, manufacture the insulation products, package them, distribute them and finally install them, than it saves by using them. Unless you're in your shed for more than a few hours at a time, it makes little sense to heat it ... better just to put on a couple of extra layers. If you're not heating it, then there is no point insulating it.
    You most certainly do NOT need to insulate it in order to store tools in it, and it doesn't seem likely that working in it the odd time warrants the environmental or financial costs of insulating it. If you're not insulating it, then you don't need vapour barriers or breathable membranes.
    mayrp2001 likes this.
  5. mayrp2001

    mayrp2001 New Member

    That's great thanks for such a detailed reply. Appreciate it.

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