Condensation under loft board


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I don’t so far have the problem, but a general question with regard to boarding over a loft storage space.

I have found info relating to condensation forming on the underside of loft boards if an air space is not left between the top of the insulation and the underside of the board, but cannot find any definite statement about whether standard loft board is, or should be, water vapour permeable.

There definitely is information on the net to imply that ”building materials “ such as ceiling plasterboard, ARE permeable, and so on pre 1970s houses there is a risk of condensation on the underside of loft board.

Is it best to assume loft board is not permeable, or are there some board materials that have a certain amount of permeability?
 
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