The role of local wisdom in building cultural and national identity has very important relevance in a society. By studying ethnoscience, we can understand different cultural ways of thinking and perspectives in explaining scientific phenomena. One of the local wisdoms in West Nusa Tenggara is the traditional house of Beleq Village. This traditional house has a roof made of reeds and poles and walls made of bamboo. The use of natural materials as building materials by the Sembalun community has its own philosophy and reasons. The aim of this research is to obtain more detailed information regarding the relevance of public knowledge and scientific knowledge regarding the use of reeds and bamboo as building materials for traditional houses in Beleq Village. The method used is a qualitative method. The results of this research show that use of reeds as a roof is able toreverse the temperature. This is in line with sacientific knowledge regarding the ability of alang-alang as an insulator in the thermal insulation process. Apart from that, the use of bamboo as poles, walls and roof trusses for traditional houses has the ability to provide the strongest support and at that time bamboo was easy to find. This is in line with scientific knowledge regarding bamboo's ability to be a sustainable plant and become stronger if dried. So, it can be concluded that there is relevance between public knowledge an scientific science.
