A picture of the first phase of construction of a flat roof. The first layer is bitumen; the second will EPDM (used to keep the rainwater from being polluted so it can be safely captured in <a href="https://en.wikipedia.org/wiki/en:Rainwater_harvesting" class="extiw" title="w:en:Rainwater harvesting">a rainwater harvesting system</a>). Flat roofs are the most cost-efficient type of roofing: all of the area both below and on top of the roof itself can be utilized easily, unlike with pitched roofs. Thanks to today's high-quality materials, there is very little danger of leaks.
<a href="//commons.wikimedia.org/wiki/User:KVDP" class="mw-redirect" title="User:KVDP">KVDP</a>
2008-06-22
<span class="int-own-work" lang="en">Own work</span>