There are actually a few set up methods: ballasted, mechanically hooked up, and completely adhered. Ballasted roofs are held set up by substantial spherical stones or slabs. Mechanically connected roof membranes are held set up with nails and they are acceptable in a few purposes wherever wind velocities aren't typically https://quotesaday.com/choosing-the-right-roofing-solution-repair-replacement-or-contractor-services/