Is Loft Board Permeable?


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Following from previous post:

I intend to board my loft floor on 7” loft legs after adding glass fibre insulation over the joists.

There are no condensation issues at present and I will continue to monitor this.

The ceiling below is plasterboard from the 1950s and there is no vapour barrier.

My question is, as I cannot verify whether standard loft board is vapour permeable, would I reduce risk of condensation under the boards if I drilled vent holes in them?
 
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