 鲜花( 57)  鸡蛋( 42)
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Advantages% A- y' N, V1 ^. I0 S3 C: {: N6 x- @
Very durable in cold weather. ^7 M# s! _7 u
High percentage of recycled material and are 100% recyclable# i+ Y( n7 \+ F W. G* @ v+ w
Disadvantages
& l( ]/ l& V9 M& R& `, [Rusting (require maintenance to prevent corrosion)
- x' h8 w, p4 NCopper and lead roofs can be targeted by metal thieves L4 v- w) O- e8 s' b
High heat conductivity of metals (particularly copper and aluminum) requires careful incorporation of insulation into the roof structure, E+ W, F: t: H; h; h
Cellular and radio reception may be negatively impacted |
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