Ntau tus tau hnov lub npe "lub tsev thaiv", tab sis tsis yog txhua tus paub tias nws yog yam khoom dab tsi. Niaj hnub no nws yog feem ntau siv rau cladding sab nraum zoov thiab sab hauv tsev. Kev txhim kho ntawm lub tsev thaiv tsis muaj teeb meem hauv kev ua haujlwm, vim nws muaj grooves uas nws yooj yim rau kev sib sau. Feem ntau lub teb chaws tsev thiab da dej yog ua tiav nrog cov khoom no