He Uku totoka, he wai ranei

E rua nga ahuatanga tuatahi o te uku: ka noho totoka tonu i te mahana o te taiao, ka huri ki te wai ina whakamahana.

I te hanga, ka whakamahana nga kaimahi i te uku ki tona ahua wai ka pania ki runga i te mata mahi. I te whakamatao, ka pakari hei paninga whakamarumaru, te whakarei ake i te parewai, commonly employed in roadway construction and roofing applications.