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Thanks felix. To avoid the possibility of falling through the ceiling at a later date, i'll follow your advice and raise the joist level along one side. _________________ moderator post locked to prevent hi jacking

The joists in my loft are just 70mm. Is it OK to put down a 100mm roll between the joists and then lie a second 100mm so that this layer goes across the joists to meet the recommended minimum depth? Are there any issues (condensation?) that means that the joists should not be covered and left to...