Non-vapour-permeable underlay for discontinuous roofings.Used as a subsidiary protective layer against wetness and dust.keep hou

Non-vapour-permeable underlay for discontinuous roofings.Used as a subsidiary protective layer against wetness and dust.keep house warm

It has good water vapor transmission,low temperature flexibility,and so on .you can read the test report which did by ITS(Intertek Testing Services )

  

synthetic underlayment