I'm planning to insulate our loft, 3 bed end terraced house 1950's. Black type sheeting is backing tiles on inside of roof, but no existing insulation between rafters (100 mm). No roof ventilation tiles either. I'm thinking of just laying the stuff that you literally unroll and lay from B&Q its about £5 per roll (i.e. insulation remains in a plastic type covering with a foil back). Is this stuff ok to use if there is no existing insulaiton / on its own or should you only use it on top of existing insulation? Any advice welcome including what i should consider using if this isn't suitable. Cheers.