Correct way to insulate a shed

xyz123

Hi
A question re insulating shed please.
Planning to use insulation foam boards on walls and roof and then board over with some ply. Question is, do I need a breather membrane or any other similar things?

Ta

RedFraggle

What are you going to use it for?

Crombers01

ideally you would install the insulation in such a manner that a clear air gap is maintained between the external face of the insulation and inside face of the timber cladding. This ensures that any moisture which can and will make its way through the board joints can dry adequately. Foil faced insulation in this situation will omit the requirement for any breather membrane.

xyz123

RedFraggle wrote: »

What are you going to use it for?

Thanks for your reply. It is for general storage (clothes, bits and bobs) and to keep a freezer and dryer. It is a large shed at 16 x 8 ft.

RedFraggle

I wondered if it was animals as we kept our rabbits in an insulated shed.

Davesnave

Crombers01 wrote: »

ideally you would install the insulation in such a manner that a clear air gap is maintained between the external face of the insulation and inside face of the timber cladding. This ensures that any moisture which can and will make its way through the board joints can dry adequately. Foil faced insulation in this situation will omit the requirement for any breather membrane.

While this is all true, foil-faced insulation, like Celotex, will work out more expensive than Jablite. Adding a breather membrane, rather than having it built-in, might still be the cheaper option.

OTOH, would a breather membrane be of great advantage, if you are not spending much time in the outbuilding and just using it as storage space for 'dry' items?

Someone else might offer a better guide on that than I can.