What Is Flat Roofing?
No roof is truly flat. What we mean by flat is low-slope: broadly under ten degrees, pitched just enough to move water toward drains and scuppers. That small pitch is the whole design, and when it is wrong the roof holds water and everything else follows.
Flat Roofing Versus Membrane Roofing
Worth separating, because the terms get used interchangeably and they are not the same thing. Flat roofing describes the geometry. Membrane roofing describes one family of materials used on it:
- Built-up roofing (BUR) — the traditional multi-ply hot-applied system. Heavy, redundant, long-serving.
- Modified bitumen — BUR's modern relative, in rolled sheets, more flexible and faster to install.
- Single-ply membrane — TPO and PVC. Lighter, reflective, welded seams.
Drainage Is The Whole Job
Ponding water is the defining flat-roof failure, and it is almost always a specification or drainage problem rather than a material one. Adding another layer over a roof that holds water buys a couple of years at most. We look at tapered insulation, drain placement and scupper sizing first, then choose the membrane.
Benefits Of A Flat Roof
Usable space is the honest headline: HVAC plant, solar arrays and equipment all sit on a flat roof without being visible from the street. A reflective surface cuts cooling load. Access for maintenance is safe and simple, which matters more over twenty years than most people credit.
Repair, Replacement And 24/7 Response
Flat roofs leak differently from pitched ones: water spreads across insulation before it finds a route inside, so the stain on the ceiling is rarely under the breach. We survey properly, and thermal imaging finds trapped moisture with no interior sign at all. For active leaks call rather than email. See roofing repair and roof replacement.
Residential Flat Roofs
Modern and mid-century homes with flat or low-slope sections need commercial techniques on a residential scale, and they are frequently roofed by people who only do shingle. Detailing at the junction between a flat section and a pitched one is where those roofs fail.
