“石板瓦”的英语？

合同规定屋顶用红瓦, 并非石板瓦.The contract specifies red tiles, not slates, for the roof.他们用石板瓦做屋顶.They roofed the house with slates.这所房子寂静无声,只听见树枝刮擦着石板瓦吱吱作响.The house was silent but for the scraping of a branch on the slates....