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。7 R# g+ X- n. ~, A2 h, I/ P$ v
产品是可以用30年/40年/50年的。4 _! D% ~; r, m7 z( I
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。% e6 J% j/ @. @0 Y
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。 7 m i( a, l' ~! x% m: R& v4 V u8 P$ A' T8 e
通常10-15年就要换屋顶。