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Mr-mgoo t1_ix9q94s wrote

If it was a normal cold roof attic you would need ro ventilate the loft space above the insulation to remove any moist air. If it's a summer house and you don't make any moisture you may be OK. It's the moisture from showers and dishwashers that xreate moisture In our houses, no so much an issue I outside buildings without steam in them, it might still be worth ventilation the space above the Insulation though, and try and make the ceiling air tight with a membrane.

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thrwaygrdn OP t1_ixbcp3s wrote

The roof itself is felt (membrane) & battened, so I think that’s fine? I am considering putting a wood burner in this summer house though, so I think that could potentially introduce vapour issues — or is that incorrect? Thanks

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Mr-mgoo t1_ixc5hoe wrote

I'm not sure that a wood burner would introduce water vapour, you need to speak to the underlay manufacturer. Call their technical department and explain the build up.

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