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枫下家园 / 美丽家居 / 房顶上保温的INSULATION 材料有等级之分吗?有好有次吗?还都是一样的?啥叫R40呀?
-ccftca(xiaowu);
2008-9-6
(#4667919@0)
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R40 是保温系数,数值越高保温效果越好, R40相当于13"左右厚的保温棉...如果有申请政府的REBATE的话,建议加到R50, 16"左右...保温棉中CELLULOSE 比较好.
-cx230138(carl chen);
2008-9-7
(#4671212@0)