My friend is cleaning out their garage. They have a whole trailer full of used insulation that has been on a trailer in there for five years. It has been stored dry and looks nice and intact.
To the question:
Is it safe to use it on the ceiling in my garage that I am building? It's not meant to be a "heated garage" but should still be frost-free in the winter. Are there any dangers with "reusing" old insulation?
I assume newer insulation is more efficient. Since it might not be enough for my entire garage, should I consider new insulation in the areas that need the best insulation?
To the question:
Is it safe to use it on the ceiling in my garage that I am building? It's not meant to be a "heated garage" but should still be frost-free in the winter. Are there any dangers with "reusing" old insulation?
I assume newer insulation is more efficient. Since it might not be enough for my entire garage, should I consider new insulation in the areas that need the best insulation?
Insulation (glass/stone-wool) does not age and become bad if it is stored well, which "yours" seems to have been. However, you should check if it still has straight cut edges and does not just consist of leftover pieces. It is more important to insulate well and avoid thermal bridges than the type of insulation. So go ahead and reuse the insulation for a first layer and then buy new for the next one!