Multilayer membrane

Multilayer asphalt and gravel roofs are distinguished by their strength and ability to effectively protect the structure from the vagaries of the weather. This roofing system is particularly effective in waterproofing buildings, making it an ideal option for flat roofs on commercial and residential buildings.

An application for flat roofs

The principle of multi-layer roofing is based on the juxtaposition of several layers of material, each with a specific function to guarantee maximum protection. The installation process begins by laying several layers of asphalt-saturated felt, generally between 4 and 5 layers. These membranes are then sealed with hot bitumen, ensuring a perfect watertight seal. Once the bitumen layers have been securely fixed in place, they are followed by a crushed gravel roof. This gravel plays an essential role, protecting the membrane from UV rays and reducing the impact of extreme temperatures. This layer of gravel will extend the life of the roof by protecting the asphalt from wear and tear caused by exposure to the sun.

A durable, long-lasting roof

Built-up roofs are renowned for their high resistance to weathering and their ability to maintain structural integrity over the long term. Although less durable than tar roofing, they still offer effective protection for around 16 years. Thanks to their thickness and solid structure, they also protect against mechanical damage, perforation and the risk of infiltration. This type of roofing is particularly suitable for commercial buildings, which require a high-performance waterproofing solution for roof surfaces that are often large and unobstructed. Because of their design, multi-layer roofs are easy to apply to large flat areas, offering a practical and reliable solution.

Local expertise at your service

At Toiture Couvreur Rive-Sud, we have the experience and know-how to install and repair your multi-ply flat roofs. Our qualified roofers have the necessary certifications to ensure work meets the highest quality standards. We offer you a solution tailored to your needs, guaranteeing the longevity and efficiency of your multi-ply roof.

Care and maintenance to ensure your roof’s longevity

Even though multi-layer roofs are robust, they need periodic maintenance to ensure their proper functioning. Regular inspections are essential, as the membrane can be affected by the vagaries of the weather over time. Proper monitoring is essential to prevent damage and maximize your roof’s lifespan.

All in all, multi-layer asphalt and gravel roofs are an ideal solution for waterproofing flat roofs. With careful installation and regular maintenance, they offer long-lasting protection against the elements and increased resistance to various types of damage.

Request a free estimate for your roofing work on the South Shore

At Toiture Couvreur Rive-Sud, we put our expertise to work for you.
Whether you need a repair, replacement or inspection, we’re here to help.
Contact us for a free, customized quote tailored to your needs.

Request a quote

Evaluation of multi-layer asphalt and gravel roofs: strengths and limitations

Multi-ply roofing has many advantages. Here are just a few of them:

Multilayer asphalt and gravel roofing is a particularly cost-effective option, offering excellent value for money compared to other types of roofing systems. This choice guarantees effective protection while remaining affordable.

The multi-layer architecture of this type of roof provides optimum watertightness, making roofs resistant to the elements, whether heavy downpours, heavy snowfall, gusty winds or hailstorms. Thanks to this design, the roof effectively copes with extreme weather conditions.

The average lifespan of asphalt and gravel roofing is estimated at between 10 and 16 years, but this can be increased by regular maintenance and occasional repairs. For example, adding gravel to damaged areas keeps the roof in good condition.

Crushed gravel plays an important role in preserving asphalt pavement, protecting it from ultraviolet rays. This protection prevents premature wear of the roof.

The multi-layer roofing system is easily adapted to flat roofs, even those equipped with various structures such as ventilation outlets, skylights, chimneys or drainage systems. It is then possible to add various elements while preserving the performance of the roofing system.

Another major advantage of this type of roof is its ease of repair. Unlike other, more complex systems, work on a multi-ply roof can be carried out quickly and without the need for extensive technical expertise.

There are a few limitations to bear in mind when it comes to multi-layer roofing.

  • Regular maintenance essential

One of the main drawbacks of this type of roofing is the need for constant maintenance. Compared to other, more durable systems, multi-ply roofing has a limited lifespan and requires regular inspections to prevent structural damage. Without proper maintenance, the roof’s performance can deteriorate more rapidly.

  • Relatively heavy weight

can be relatively heavy, which could pose problems for certain structures not designed to withstand this load. Additional reinforcement of the structure may be required, which may entail additional costs.

  • Unpleasant odours during installation

The application of hot asphalt as part of this type of roofing can give off unpleasant odours, an aspect to be taken into account during installation, especially in residential areas or sensitive environments.

  • Influence of climatic conditions on processing

Weather conditions can have a significant impact on installation quality. Temperatures that are too low or inclement weather can affect asphalt adhesion and compromise the effectiveness of the coating. Choosing the right time to carry out this operation is therefore crucial.

Installation and maintenance

  • Installation method

The installation of a multi-layer asphalt and gravel roof follows a precise process. It begins with the application of #15 felt paper to the roof surface, which is then impregnated with hot asphalt. A final layer of gravel is then applied to provide protection against moisture and the sun’s rays, ensuring the roof’s longevity.

  • Importance of expertise

To guarantee quality installation and avoid any risk of failure, it is essential to call on the services of qualified roofers. Asphalt temperature and climatic conditions directly influence the quality of the application, making professional expertise indispensable.

  • Preventive maintenance to optimize service life

Periodic maintenance is crucial to keeping the roof in good condition. We recommend checking the condition of the gravel annually, to ensure that it covers the membrane evenly. In the event of disbondment, the affected areas should be swept, liquid asphalt applied to repair and the gravel repositioned. This helps prevent direct exposure of the membrane to UV rays, which could accelerate degradation.