• FM Approved
• CE Marked EN15283-1:2008+A1:2009
• Reaction to Fire A1 (EN13501-1)

Resistance to Fire

Designed to offer the roof assembly increased protection from fire and heat spread. When installed as a cover board, DensDeck® Prime Roof Boards help protect the roof assembly from external fire sources, such as malfunctioning solar panels or embers from a nearby building. Installed as a roof board, they help to protect the roof from internal fire spread. The chemical make-up of the DensDeck® Prime Roof Board’s gypsum core contains up to 21% chemically combined water to 79% inert calcium sulphate, which helps slow the spread of fire. Fiberglass mat facers act as the first line of defence.

Wind Uplift Performance

DensDeck® Prime Roof Boards are homogeneous, flat, and strong substrates for the installation of adhered, semi adhered, and manually fixed roofing membranes. Increased material compatibility, evenly spread adhesives, and enhanced fastener pull increase membrane bond strength and the dimensional strength of the roof assembly. As a result, the roof has a greater resistance to wind uplift and the membrane is protected from repeated hail strikes and incidental damage by flying debris. DensDeck® Prime Roof Boards act as a barrier that helps protect the roof insulation & waterproof membrane layer, decreasing risk of water ingress.

Durability

Our durable cover boards help protect the roof assembly during the construction phase and throughout its design life. The cover board has high
compressive strength, which increases the load capacity of the roof assembly. This helps protect the insulation layer from compression as the cover board helps absorb the impact of foot traffic and dead loads of roof installed equipment. The high bond strength between the cover board and the roof membrane helps shield the membrane from accidental puncture by dropped tools and damage by sudden impact.

Acoustic Performance

Cover boards help to block the sound penetrating through a roof assembly
into a building. The cover board can be specified in high-noise commercial
settings, such as airports, to help design the noise out of the building and
increase occupant comfort. The cover board can also help to contain the
sound within noise-polluting buildings, such as factories. This helps protect
surrounding buildings and the environment. Designing roof systems with DensDeck® Prime Roof Boards can help achieve better acoustic
performance and deliver healthier buildings.

Dimensional Stability

DensDeck® Prime Roof Boards are engineered for durability while supporting efficient installation. The boards are dimensionally stable, helping maintain consistent performance within the roofing assembly over time. Our cover board is lightweight, making it easy for installers to handle and position on the roof. Installation is also streamlined because boards can be butted tightly together with no gapping required, creating a clean and uniform surface. The material is easy to cut and detail around penetrations or edges, which helps installers work efficiently while maintaining precise installation and supporting a durable roofing system.

Chopped fiberglass reinforcement within the core helps maintain board integrity under rooftop stresses such as foot traffic and equipment loads. In addition, the gypsum core contains chemically bound water that is released when exposed to high temperatures, helping slow heat transfer and contributing to the fire performance of the roofing assembly.

Together, these engineered elements help support the durability, protection, and fire performance required for modern commercial roofing systems.