... :*the service life is long ,bears aged ,the roofing to be possible to use above 20 years ,underground may reach 50 year ... the impact resistance are good*constructs ,the wide breath to join ,the guest conveniently to weld reblably few ,reblable ,and does not have ... the general waterproofing materials ,curls the material the outstanding performance to cause it widely to apply in waterproof each domain