New composite sheathing for home construction

C-SIS Sheathing is made with 100% composite materials and manufactured without adhesives.

Composite Panel Building Systems (CPBS, Corpus Christi, TX, US) has launched its new fully composite sheathing for new construction and retrofitted homes and apartments. The company says that the Composite Structural Insulated Sheathing (C-SIS) earns Leadership in Energy and Environmental Design (LEED) points and National Association of Home Buildings (NAHB) green certification.

C-SIS Sheathing is made with 100% composite materials and manufactured without adhesives; the fiberglass reinforced thermoset (FRT) skin is bonded by a chemical reaction to the polyurethane foam insulation during manufacturing so the risk of delamination is eliminated. The FRT skin yields a stronger, long-term sustainable skin that is impervious to moisture and mold damage. Working together, the FRT skin and joint sealing system block air infiltration; no house wrap is needed.

Many house wraps and water resistive barriers suffer damage during installation or fail to prevent water intrusion before finish materials are applied. House wrap's easy to tear, woven structure adds to project waste and cost by the rework required to patch damaged areas. Similar damage to laminated sheathing is much more complicated and expensive to repair or, more likely, replace and critically affects the structural reliability of the wall system. The C-SIS Sheathing's durable FRT polymer skin is impervious to water and engineered to withstand the rigors of the construction process without losing performance value.

The continuous polyurethane foam adds R-6 insulation in 1-1/8" sheathing, R-12 in 2-1/8" sheathing, and eliminates thermal bridging through wood or metal studs. Thermal bridging is the conduction of temperatures through materials such as wood or metal studs which leads to significant energy loss. The C-SIS attaches directly to the wall frame and isolates framing members from thermal bridging with polyurethane foam. Thermal loss through the C-SIS joints is removed with the use of the incorporated joint sealing system.

CPBS has teamed with materials manufacturing companies including 3M and Screw Products to produce an integrated accessory system that drives additional energy savings. These accessories for the tight sealing of the joints, fastening and flashing measurably increase the long term, sustainable air and water barrier capabilities of the entire C-SIS System.

"Everything architects and builders need in a sheathing product, the C-SIS System delivers and allows the process to be streamlined, speeding construction time, saving labor costs while increasing building performance," according to a CPBS spokesperson.

Additionally, CPBS offers property owners, who want to upgrade their building's energy efficiency, the Exterior Energy Retrofit which consists of new insulation in the wall, upgraded, high performance composite framed windows and doors, an optimized HVAC system design and the C-SIS Sheathing System, finished with stucco or siding.