Overcapacity in conventional PVC siding is rapidly compressing the market as major siding makers merge.CertainTeed Corp.,Valley Forge,Pa.,is buying Owens Coming's siding business,making CertainTeed the biggest PVC siding producer in the U.S.(At the same time,CertainTeed is also building new fiber cement siding plants.)Meanwhile,Plygem Industries Inc.,Kansas City,Mo.,maker of Variform siding,this year bought Alcoa's siding division,Alcoa Home Exteriors,Pittsburgh.
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机译：随着主要壁板制造商的合并，常规PVC壁板的产能过剩正在迅速压缩市场。宾夕法尼亚州Valley Forge的CertainTeed Corp.正在收购Owens Coming的壁板业务，从而使SomeTeed成为美国最大的PVC壁板生产商同时，密苏里州堪萨斯城的Plygem工业公司（Variform壁板的制造商）今年收购了美国铝业的壁板部门，匹兹堡的Alcoa Home Exteriors。
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