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Roof with multi-layer bitumen and gravel coating
Multi-layer asphalt and gravel surfacing includes several layers of asphalt felt impregnated with liquid bitumen and topped with fine gravel, providing protection from the sun’s rays.
In Montreal, many property owners choose white gravel to limit the effects of heat islands during periods of high temperature.
Many advantages
The advantages of roofs with a multi-layer bitumen and gravel coating are numerous:
- Sturdiness and waterproofing thanks to the thickness of the coating;
- Easy to repair ;
- Good sound insulation ;
- Lower costs compared to other roofing options, especially elastomeric membrane roofing).
Careless maintenance of bitumen and gravel roofs can considerably reduce their theoretical lifespan (15 to 20 years).
Regular inspections are therefore essential.
In addition, to protect the coating from UV damage, a layer of white gravel can be applied on top of the last bitumen bed.
Installing a multi-layer membrane
The installation of this covering, consisting of multiple layers of asphalt felt and a final layer of gravel, is relatively straightforward.
However, qualified professionals are required because of the thickness of the material and the high bitumen temperatures or weather conditions that can alter the final quality of the roof.
How do I maintain a multi-layer membrane?
Flat roofs require regular maintenance to operate efficiently.
This configuration requires special water management.
Water does not run off the sides of a flat roof, but is directed towards the center, where it is drained away.
This is the preferred option for covering large areas.
However, flat roofs require annual inspection to ensure that joints are always watertight and that drains are not clogged.
In addition, in the event of heavy precipitation, snow removal must be carried out at least once a year.
To remember : A high-performance coating
Bitumen and gravel roofing has proven its performance for over 150 years.
This protective layer is generally the best choice for roofing residential, commercial and industrial structures, especially when it’s necessary to navigate around features such as vents, ventilators, chimneys and skylights to ensure seamless impermeability.
