Roll mat - - - can be cut and fit into different types of cavity wall , can be installed into any position of the construction , especially the long and nonblocked area , such as the roofing of metal building ; the slot of power lines , water pipes 卷氈- - -經切割可以用于任意尺寸的墻體空腔,安裝于建筑的任意部位,特別是長而無阻塞的區域,如鋼結構屋頂;電線管、水管通過的槽隙等。