Single-ply Roofing Membranes:
Single-ply systems are made up of large sheets of various materials--elastomers such as EPDM, and various thermoplastics. As the name implies, only a single layer of this material is used to complete the roof. In general, these materials offer good elasticity and weather resistance.
There are several different techniques for attaching single-ply roofing systems to a roof. Many single-ply roofs are "ballasted," or anchored by a layer of stone or paver blocks. Others are mechanically attached to a substrate or deck using screws and reinforcement plates. A third option is the "fully adhered" single-ply roof which is completely glued to the roof substrate. Other single-ply roofs can be installed using a combination of methods.
Single-ply roofing systems are generally faster and easier to install than built-up systems. But because a single layer provides all the waterproofing and weather-resistance, installation techniques are more demanding and proper installation is critical.
Types of single-ply roofing
EPDM (Ethylene Propylene Diene Monomer) - better known as "rubber" roofing, EPDM membrane offers a host of advantages. EPDM is considered to be the longest lasting membrane roof system and can be installed in several ways; fully adhered, ballasted or mechanically attached. Overall EPDM roofing offers enhanced weatherability, durability and versatility but has greater difficulty withstanding oil and chemical attack.
Advantages:
- Versatility- flexible roof applications
- Ease of Installation- fast and easy to apply
- Ease of maintenance & Repair
- Durability- the longest lasting membrane
- Superior Ultra-Violet Radiation Resistance
- Strong warranties
TPO (Thermoplastic Olefins) single-ply roofing is heat-welded roofing system which offers the resilience of an EPDM membrane with extreme tear resistance. TPO can be applied as a ballasted, fully adhered, or mechanically fastened roof system.
Advantages:
- Increased tear resistance
- Better Chemical/oil grease resistance
- Available in various colors
- Reflects heat which can contribute to lower cooling costs
- Strong seaming technology
- Cold temperature applicable
Limitations:
- Newer technology- not market proven. Less resilient to ultra-violet degradation
