Whats the best type of loft insulation?
Rockwool (glass fibre) insulation is ghastly stuff both for the fitter and for the environment. It contains all sorts of nasties and the fibres can be inhaled and cause all sorts of trouble… best suggestion is to steer well clear. For a more environmentally sound and healthy option I would use Sheep’s Wool, Flax or recycled clothing insulation. The prices have dropped dramatically over recent years and they are the only sensible option these days. As for the insulation that’s already there… well, it’s already there and can probably just be left in place – more hassle and discomfort to remove than to leave there. Just top up to a good level with some of the good stuff.
