hi all, my first post!! im looking to remove the ceilings on my 1930-40's home i recently purchased, i can work out of most of the joist from the loft and thinking of doing room by room even though the entire upstairs ceiling needs to be replaced with plasterboard in my own opinion, they are the cork/mdf/hair type boards which are sagging in places/joint marks appearing/wavy ceiling. Im somewhat concerned about the black dust under the insulation as i searched this on the net and there are articles health effects from fibre glass dust / black dust etc..??, is it advisable to bag the insulation in the loft then hoover the ceiling from loft area before breaking the boards to minimise dust? any tips on this would be greatly appreciated. thanks. by the way, there is about 5mm of this black stuff under the insulation, im not sure what it is or where it comes from.... the thought of all that dust falling down into the room is daunting me