Can anyone please help. I have a bedroom extension over the garage with a flat roof. I want to insulate the roof but I'm concerned about condensation and mold. I was going to use some rockwall and push it down between the joists from within the house main loft. I think the roof is a cold roof as there is no external ventilation. As the flatroof is joined to the house loft, will the air flow be sufficient enough to not cause condensation.
Thanks[/b]
Thanks[/b]