Flat Roof and Low Slope Installation
Flat Roof is below 4:12 Pitch
Some people are wary about using a flat roof, as many roofers will try to apply a low-sloped roof without the proper knowledge of how and why. We can assure that this type of roof can be just as good as any other roof if applied correctly.
When installing a Low-Sloped roof, proper drainage is crucial. This may sound like common sense, but many roofers fail to install roof drains low enough to allow water to drain without pooling.
More so than with any other roof however, is the need for proper insulation to prevent condensation. The amount of insulation needed to prevent condensation is referred to as its ‘R-value’. Every building has a different R-value, depending on what the building will be used for. All contingencies must be considered when determining the R-value needed. High concentrations of moisture, such as in shower rooms, indoor pools and hot tubs, and kitchens, will all have a different R-value for the insulation. If the R-value of the insulation is too low, moisture in the air will condense on the bottom of the decking and cause mold and leaks, even if the roof itself has no faults.
Why insulation is so important to a flat roof assembly
When roof insulation is at the correct R-value, the point at which air moisture condenses should be in the center of the insulation, where it will never become a problem. Every architect should be able to tell you what the R-value of the insulation in your building should be.
On a flat roof or low sloped assembly, the insulation should always be on top of the decking and never underneath it. Proper ventilation inside the building is mandatory; it can either be done though the roof via air vents or through the walls.
The right choice in flat roof products is also very important. Even if a PVC roof is not the choice for you, always choose a product with a real manufacturer’s warranty on the product, rather than relying solely on the roofer’s warranty. Also make sure that a representative of the manufacturer inspects the roof before the warranty is issued. Duro-Last does this with all commercial buildings. The life of a good low-sloped roof properly installed should be at least 30 years.
