Insulation resistance: thermal conductivity of rock wool sandwich panel is mineral wool insulation properties of = 0.043W / ㎡K based supply fireproof rock wool board, rock wool core material with a thickness corresponding demand ratio is calculated obtained. Sound-absorbing insulation effect is remarkable: stiffness: As core material and two layers of steel wool into a cohesive whole, to work together, plus the surface waves from the roof-pressure, the overall stiffness far better than the pressure plate clip wool (glass cotton) live composite sheet. Sandwich through the connecting members and purlins fixed fire rock wool board, greatly improving the overall stiffness of the roof where a good fire rock wool board, strengthen the overall performance of the roof. Selection wool sandwich panels, purlin distance can be larger, it can save purlin dosage of 1/3 to 2/3.