Different quality results in different lifespan. Some warranty 25 years while the excellent ones have a lifespan of 50 years. Of course, there are others in between and last from 30 to 40 years. They are all priced differently.
我应该是这个领域的权威了。我曾经在IKO工作过。1 n. [, X- Q: K+ _4 {& K! Q( R
产品是可以用30年/40年/50年的。& C: X& u$ _$ ?4 u. P j8 E
但是记住,安装水平是整个屋顶的关键,这就是有的安装公司要价1万但是另家可能只要6千的原因。2 d9 U* p. y1 U
质保是取决于怎样安装。还有房顶的角度和结构,屋顶的底料。) Y0 I* V: ~5 a% h