In the commercial roofing industry, there are two types of membranes that are commonly used: single-ply and multi-ply. While both have their benefits, there are some key differences between the two that should be considered when deciding on your business. Here is a look at the differences between single-ply and multi-ply membranes to make the best decision for your roof.
Energy Efficiency
The manufacture of asphalt-based multi-ply systems consumes a lot of energy and can cause pollution. They also have a dark color that attracts rather than reflects the sun’s rays. The cold-applied technique is easier to set up and produces no harmful byproducts.
Multi-ply systems frequently provide more insulation than single-ply systems, but at the expense of increased thickness. Because of its light color and excellent reflectivity, TPO is one of the best materials for constructing a single-ply system. EPDM, as a black material, absorbs more heat than lighter colors.
Cost
The single-ply membrane is less expensive than the multi-ply membrane. The main difference between the two membrane types is the number of layers. Single-ply has one layer, and multi-ply has two or more layers.
The multi-ply membrane is more expensive because it has more layers. The additional layer(s) provide(s) greater protection against water and other elements. Multi-ply is often used in commercial applications where a higher level of protection is required.
Durability
A single-ply roof typically has around 30 years, but a multi-ply roof can last up to 40 years. This is because they have multiple layers of protection, including a base layer, an asphalt layer, and a top layer. Single-ply membrane roofs only have one layer of protection. The quality of a roof’s installation and maintenance greatly influences its lifespan. Slate and tile roofs are admired for their durability and low maintenance requirements.
Water Leakage
A multi-ply system is the best way to prevent water leaks. They are seamless and have no joints or seams, making water infiltration impossible. Because of the joints and seams in the material, single-ply roofing is more prone to leaks. On the other hand, single-ply roofing will be as watertight as double-ply if these vulnerable areas are properly sealed after installation.
Fire Resistance
Single-ply roofing, particularly TPO and EPDM, is frequently treated with flame retardants. Asphalt has a significantly higher ignition temperature when applied to a built-up or modified bitumen roof. However, installing a cold-applied roof is less dangerous.
UV Radiation Protection
Both single-ply and multi-ply roofing materials effectively shield buildings from the sun, but both have drawbacks. When exposed to UV radiation, the glues used to seal seams and joints in single-ply roofs may degrade over time. As a result, as previously discussed, these locations may become more vulnerable to flooding.
Although multi-ply roofs reflect some of the sun’s heat, the membranes closest to the surface will deteriorate over time. Except for the addition of a gravel layer on top, a multi-ply roof is as UV-resistant as a single-ply roof.
Conclusion
Single-ply and multi-ply membrane roofs each have their benefits and drawbacks. Single-ply roofs are less expensive and easier to install, but multi-ply roofs are more durable and can better withstand heavy traffic and severe weather conditions. When choosing a roofing system for your commercial building, it is important to consider your budget, the climate in your area, and the amount of traffic your roof will experience. Mid State Roofing can help you select and install the best roof for your needs and provide ongoing maintenance to keep it in top condition. Call us today for a free consultation!
