Adequate ventilation in a cold loft

8 Jun 2017
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United Kingdom
I have a cold loft in a pitched roof. Insulation is over the ceiling not under the rafters.

I want to put 9mm plasterboard up under the rafters for aesthetics, I won't insulate between the rafters (100mm deep) as there is already insulation over the ceiling joists.

If I do this, do I risk cutting off the ventilation or is this only a risk if I were to insulate between the rafters?

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The plasterboard will get damp as the attic is where the moisture from the house dissipates.
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I'd get a roll of white breather membrabe instrad and staple it up nice and tight. Easier to get through the loft hatch too. Presumably you're trying to stop the dust/cobwebs and get the light bouncing around a bit?

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