Flat roof lifespan by type of roof covering

Re-roofing is a major investment for most residential or commercial building owners in Quebec. The lifespan of the covering is therefore normally a main concern.

Les Couvreurs Duro-Toit is here to help you choose the right roofing membrane according to its lifespan.

Does flat roof lifespan depend on the covering?

Flat roof durability depends on many factors. Choosing the right membrane is crucial because the materials used affect the longevity of your roof.

Knowing your different options is therefore important to choose the right covering.

Multi-layer asphalt and gravel membrane

Prolonged sun exposure is the main cause of premature deterioration of flat roofs with a multi-layer asphalt and gravel membrane. UV rays strip this flat roof covering of its oils and cause cracks that can compromise the flat roof membrane. This is particularly true on roofs where gravel has been displaced and no longer acts as a shield against the sun’s rays.

A multi-layer asphalt membrane will need to be replaced after 15 to 20 years if maintenance is neglected. However, it could last 25 to 30 years if you make sure that the gravel remains in place and repair membrane cracks quickly.

Elastomeric bitumen membrane

Slightly more expensive than the multi-layer membrane, an elastomeric bitumen membrane on a flat roof has an extended lifespan and ease of maintenance. Moreover, these membranes have excellent insulating properties, resulting in long-term energy savings.

The average lifespan of this membrane is 20 to 25 years. It can easily last over 30 years when professionally installed and maintained every two years, especially if the flat roof is properly ventilated.

EPDM or TPO monolayer membrane

EPDM and TPO monolayer membranes are environmentally friendly flat roof coverings that are even suitable for roofs with a large surface area. Requiring little maintenance after installation, they offer exceptional resistance to fire, bacteria, mold and mildew as well as various air pollutants.

Owners are increasingly choosing this membrane due to a high resistance to temperature variations and UV rays. Additionally, these two materials are 100% recyclable at the end of their lifetime, which can be up to 20 years.

Guarantee the longevity of your covering with preventive maintenance and repairs

Regular inspections are important for a flat roof covering to reach its full lifespan. The condition of the flat roof provides information on the condition of the covering, the strength of the flat roof structure, building waterproofing, material integrity and weather resistance. Any defects found require repairs before the building suffers major water infiltration related damages.

Regular flat roof inspections are the best way to ensure proper ventilation, which has a particularly significant impact on the lifespan of a flat roof membrane. It is even included in manufacturer warranties since poor flat roof ventilation wears out the covering prematurely.

Make sure your flat roof lasts long with Les Couvreurs Duro-Toit

In conclusion, you can expect your new flat roof to last at least 20 years if you choose one of the three mentioned membrane types.

This estimate depends on proper installation and periodic maintenance by roofing professionals. To maximize your return on investment, contact Les Couvreurs Duro-Toit for the repair and maintenance of your flat roof or a free quote.


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