Steel structure roof basically uses glass wool roll mat, because rock wool roll mat is six to ten times heavier than glass wool roll mat, light steel frame can't bear so much gravity, glass wool is more fluffy than rock wool, so it's thermal insulation effect is better, glass wool is cheaper than rock wool, the glass wool fire rating is A-level flame retardant, now people won't use the rock wool blanket, wall thermal insulation used rock wool board.
