Stiffness: As core material and two layers of steel wool into a cohesive whole, to work together, plus the roof surface from the wave-pressure Caigangyanmian board how much money, far better than the overall stiffness pressure plate clip wool (glass cotton) live composite sheet. Sandwich through the connecting members and purlins fixed Caigangyanmian composite panels, greatly improving the overall stiffness of the roof Caigangyanmian board company, to 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. Public buildings: sandwich panels can be mainly applied to large space needs of public buildings roof and exterior walls, such as: mechanism, the station waiting or waiting hall, stadiums, theaters and auditoriums, exhibition and convention centers, museums Caigangyanmian board, and so on. Public buildings because of the need to provide more space, there is a series of more demanding than the industrial plant features indoor air conditioning, fire protection, current use of the grid in the form of such buildings or tube truss roof truss structure, so the roofing material In terms of light, heat and thermal insulation, fire safety, water, sound absorption and durability have put forward higher requirements.