Flat roof insulation

Flat roof insulation is a hard job to do and should be handled only by professionals. The biggest problem with flat roof insulation is water. There are a few methods that will stop water from infiltrating into your insulation.

One of these methods is blanket insulation, blown insulation or rigid insulation. Only someone with experience can tell you which of the methods to use.


There are many types of roofs:

  • Gable roofs
  • Hip roofs
  • Intersecting roofs
  • Butterfly roofs
  • Mansard roofs
  • Gambrel roofs
  • Shed roofs
  • Flat roofs

All of them have a pitch that allows water to run down the roof. Flat roofs are an exception, and if they are not designed properly, they can cause water to pool.


Materials used for flat roof insulation are mineral wool, fiberglass, cellulose fiber, vermiculite, Styrofoam, polystyrene and polyurethane. The materials used can differ upon preference and situation. Ventilation is an important factor of keeping your flat roof dry.

Flat roof ventilation

Ventilation is very important as it lets moisture accumulations to escape. Also it let’s hot air to escape. Because flat roofs do not have eaves, the vents will need to be installed in the exterior walls, or you can install roof vents. These last ones will need to be sealed perfectly to avoid water seeping in.

Vapor barriers

These barriers are installed between the insulation and the climate conditioned area. The vents will allow the moisture to escape, preventing drywall rotting. The materials used for vapor barriers are made from polyethylene film, asphalt-laced building paper or paper-backed aluminum.


These bypasses are where there is a break in the insulation. These areas are spaces that insulation cannot cover, like the space around a light fixture. Bypasses can create pockets of moisture that lead to damage, and can also let warm air escape.

Types of insulation

Blown insulation is the easiest to install, but you will need to call an experienced contractor. Blanket insulation are very cheap, but they can also be hard to install.

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