Concertina foil batts perfect for all climates
If you live in a warm humid climate and have bulk insulation in your ceiling and its not working. Check this product out. Its perfect for diy, its cheap and it will produce excellent results. You simply sit it on top of your existing bulk insulation or staple it between your rafters. They are called concertina foil batts, they are very simple but so clever.
I have spoken to the owner of this company a number of times and he is so helpful, honest and passionate and there is some really handy information on this website. Check it out