Fashewar Shenhai-Hujja
Kwalta ya wanzu a jihohi biyu na farko: ya kasance mai ƙarfi a yanayin yanayin yanayi kuma yana canzawa zuwa ruwa lokacin zafi.
A cikin gini, ma'aikata suna dumama kwalta zuwa yanayin ruwa kuma suna shafa shi a saman aikin. Bayan sanyaya, yana ƙarfafawa cikin rufin kariya, inganta waterproofing, yawanci ana aiki da su a aikin ginin titin da yin rufi.