Construction and Materials
CertainTeed offers a range of Modified Bitumen roofing systems designed for superior performance and durability. These systems are engineered to meet the demands of various building types and climates, providing robust waterproofing and long-term protection.
The construction of CertainTeed Modified Bitumen roofing typically involves a multi-ply system. This approach builds up layers of specialized materials to create a seamless and watertight membrane. Key components often include:
- Base Sheet: This is the foundational layer of the system, providing a stable underlayment for subsequent layers.
- Inter Ply Sheet: Additional layers can be added to enhance the overall strength and performance of the membrane.
- Cap Sheet: The top layer is a specially formulated surfacing material that provides the primary weather protection. It is often granulated for UV resistance and aesthetic appeal.
The materials used in CertainTeed Modified Bitumen systems are engineered for resilience and longevity. The core of the system is bitumen, a petroleum-based asphaltic substance, which is modified to improve its performance characteristics. Two primary modification types are commonly used:
- APP (Atactic Polypropylene): APP modification enhances the bitumen's elasticity, UV resistance, and high-temperature stability. This makes it particularly suitable for hot climates and applications requiring resistance to thermal aging.
- SBS (Styrene-Butadiene-Styrene): SBS modification imparts excellent flexibility and elasticity to the bitumen, allowing the membrane to withstand structural movement and temperature fluctuations. SBS-modified bitumen is known for its superior low-temperature performance and crack resistance.
These modified bitumen layers are reinforced with various materials to provide dimensional stability and tensile strength. Common reinforcing materials include:
- Polyester Mat: Offers high tensile strength and puncture resistance, allowing the membrane to adapt to building movements without tearing.
- Fiberglass Scrim: Provides excellent dimensional stability and resistance to stretching and shrinking.
The surfacing of the cap sheet is designed to protect the underlying bitumen from the elements, especially ultraviolet (UV) radiation. Options for surfacing include:
- Granules: Mineral granules embedded in the surface reflect sunlight, reducing heat absorption and prolonging the life of the roofing system. These are available in various colors to complement building aesthetics.
- Foil Surfaces: Some products may feature a reflective foil surface for enhanced solar reflectivity.
Installation methods for CertainTeed Modified Bitumen systems can vary depending on the specific product and application, but commonly include:
- Hot Asphalt Application: The bitumen layers are adhered using hot asphalt.
- Torch Application: Heat is used to melt the bitumen and bond the layers together.
- Cold Adhesive Application: Specialized cold adhesives are used for bonding, offering a VOC-compliant option.
- Self-Adhered (SA) Systems: These membranes feature a factory-applied adhesive, requiring only the removal of a release film for installation.
These systems are suitable for a wide range of roof slopes, from low-slope to virtually flat applications, and are often utilized on commercial, industrial, and institutional buildings where robust waterproofing is essential.