Insulating under flat roof

[Glyn1959]

Hi, I have converted part of garage into downstairs cloakroom. Need advice on insulating before putting plasterboard ceiling on. I have levelled out the sloping joists with thin strips of wood but do not know what type/thickness of insulation to use. The joists are 5 inch. Advice please

 

[nowtaboutnowt]

Hi Glyn1959
I was just about to post this question, so I'll jump in here for an answer.
My converted room is a kitchen with concrete flat roof, wondering if need vent or something to remove/prevent moisture?

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Nowtaboutnowt, please raise your own post. Your roof is quite different and you will confuse the issue. Feel free to read forum Rules on Hijacking.

MOD RUPERT

 

[WabbitPoo]

Hi, I have converted part of garage into downstairs cloakroom. Need advice on insulating before putting plasterboard ceiling on. I have levelled out the sloping joists with thin strips of wood but do not know what type/thickness of insulation to use. The joists are 5 inch. Advice please

What did you describe in the proposal you sent to your BCO before starting work? Find out, then do that.