![]() Membrane roofs vary pretty wildly in chemical composition, the most common being a polyvinyl chloride base (PVC or vinyl), though several other synthetics of similar nature also exist. It’s either applied with heat, a chemical activator, or via self-adhesion, heat being the oldest and most common way to do it. Modernly, it usually comes in rolls of pre-sandwiched asphalt and fiberglass or felt. It is topped with crushed stone, river rock, artificial mulch, lava rock, or crushed shell. ![]() It’s built by introducing layers of tar/asphalt, fiber (often fiberglass, though felt originally). It’s been around since the Victorian era at least, though it’s arguable that an ancestral form of it has existed much longer, with tarred roofs. The same problems do happen, but for different reasons.īUR is the oldest way to do a flat roof short of exposed adobe or wood. It’s a different beast than sloped or pitched roofs. Today, we’re going to go over a brief refresher of how flat roof materials work, the symptoms of a roof needing attention, and the pros and cons of replacing versus repairing. The question is, with the cost of some options, and the difficulty of removing others, which is going to be more viable and cost-effective when the time comes? Should you replace or repair a commercial flat roof? This leaves people with flat roofs two basic options, a built-up roof (BUR), or one of the membrane approaches brought about by more modern sciences. It has been done, but they’re not made for these types of roofs, and it doesn’t work out well most of the time. Unlike a pitched roof, shingles and most metals and tiles aren’t viable. Flat roofs have a specific set of challenges when it comes to repairing or replacing them.
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