Structural softwood decking beneath a polyethylene vapour barrier and deep I-beam rafters supports 500 mm of cellulose fibre insulation.
结构软木装饰在聚乙烯隔汽层下面，深的I型梁、椽支撑着500m m厚的纤维板保温层。
Structural softwood decking beneath a polyethylene vapour barrier and deep I-beam rafters supports 500 mm of cellulose fibre insulation.
结构软木装饰在聚乙烯隔汽层下面，深的I型梁、椽支撑着500m m厚的纤维板保温层。
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