防水油毡,防水毡;
In this example, the first layer of tar felt is nailed to the boarding and the subsequent layers are bonded to each other in hot tar.
此例中,第一层油毡是用钉子钉在木板上的。上面的几层油毡是用热沥青粘合起来的。
Fig.9 illustrates a simple flat roof, consisting of timber bearers covered with timber boarding and finished with several layers of tar felt.
图9所示为一个简单的平屋顶它由木承梁组成并铺以木板,再铺几层油毡防水。
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