New PAC-Shield CV Roof Vent Improves Efficiency, Extends Roof Life

Petersen expands it PAC-CLAD line of architectural metal cladding systems with the launch of its new PAC-Shield CV roof venting system. PAC-Shield CV is a ventilated composite insulation panel that includes a 4x8-ft. layer of closed-cell rigid polyisocyanurate, integrated solid wood spacers that create a standard 1-in. air gap, and a top layer of APA/TECO-rated OSB or plywood. The venting system is designed to improve energy efficiency, prevent ice dams, extend the lifespan of a roof and control moisture in steep-slope roof systems.

The new PAC-Shield CV helps keep building interiors cooler in the summer by reducing heat transfer, and adds insulation in the winter to lower energy costs. Ideal for use with metal roofs, slate, tile and shingles, the venting system maintains consistent roof temperatures to prevent the melt-and-freeze cycle that causes ice dams. It also promotes healthy airflow, reduces trapped moisture and supports better indoor air quality while meeting many building code requirements for ventilation and energy efficiency.

“PAC-Shield CV is a solution-filled product with multiple benefits to the building owner,” says Mike Weis, VP of sales for PAC-CLAD, a Carlisle Architectural Metals company. “It’s also another tool that architects and installing contractors can use to build high-performing and great-looking roofing systems for their building owner customers.”

PAC-Shield CV is recommended on steep-slope applications of 3:12 or greater. The PAC-Shield CV venting system can be used with a variety of finished roof assemblies including all types and weights of metal roof systems. Many times, some type of ventilation under the roof system is required for a variety of reasons. If air is allowed to flow under the roof system the temperature on the roof will remain cooler and more consistent thus reducing oil canning and other issues. For slopes less than this, PAC-Shield Nail Base non-vented nailable polyiso insulation panel is recommended.

Advantages of using the PAC-Shield CV venting system include:

• Enhanced passive ventilation: PAC-Shield CV incorporates a built-in 1-in. air space with wood spacers, providing more than 92% open air space and 75% lateral air movement
• High R-values: Polyiso core delivers R-5.7 to R-20.5 for strong thermal resistance and energy efficiency
• Extended roof life: PAC-Shield CV reduces heat buildup and thermal stress, helping to protect panels and materials for longer-lasting roof performance
• Prevent ice dams: Airflow keeps the roof temperature constant, further eliminating hot and cold spots on the roof where ice dams are formed
• Moisture control: Ventilation helps reduce trapped moisture, preventing mold and damage, especially in humid climates
• Sustainability and compliance: Made with eco-friendly NexGen Chemistry, PAC-Shield CV satisfies requirements of codes such as ASTM C1289 and the IBC
• Cross-directional airflow: necessary for valleys and dormers
• Spacer block positioning is visually marked for ease of fastener placement
• Wood edges are rabbited to provide for expansion and contraction while allowing the foam edges to be installed tightly to achieve thermal integrity across the entire roof deck

More information on PAC-Shield CV can be found here on pac-clad.com.