 鲜花( 57)  鸡蛋( 42)
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Advantages, F4 x* Z- Z2 j$ B, H( D
Very durable in cold weather% s$ B, y, ?2 P: r3 X" u
High percentage of recycled material and are 100% recyclable
8 G$ q; l& q/ ~ s+ B9 c8 T# _4 yDisadvantages2 ]9 V X B. Q, I3 C
Rusting (require maintenance to prevent corrosion): F( U O g: H4 M( l+ ^' W( D& j
Copper and lead roofs can be targeted by metal thieves9 X8 o2 D$ Y' l' _8 Y& T- i
High heat conductivity of metals (particularly copper and aluminum) requires careful incorporation of insulation into the roof structure" O" e# V% A, ?, |3 z
Cellular and radio reception may be negatively impacted |
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