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SAys its to stop water vapor produced from cooking living washing etc entering the loftspace then condensing on the rafters joists etc

the vapor barrier in my diy book is says should be under the loft floor rockwool insulation.

ITS A PITCHED ROOF

ok what about the vapor barrier do you know what fucntion that might have ?

NEW HERE want to insulate loft , am clearing out the old loft insulation as the company doing the work will take up insulation to 250mm( joits depth 150mm) using red insulation fibre. i am wondering 1 how safe is it removing the old stuff i use a dust mask and layers of old clothes and gloves...