HomeMy WebLinkAboutIMG_20210816_0004ENGINEERED
WooDs
Technical Tip Att""hrnunt L
Overdriven Fasteners in ZIP System@ Sheathing
Nails used to attach ZIP $ystem sheathing to supporting framing members may
occasionally penetrate beyond the face of the ZIP System panels. An ideal installation
would be where fastener heads are flush with the panel surface. For this
correspondence, "Overdriven Fasteners," are defined as nails that are installed through
the panel and into a framing member, like a wall stud or rafter, with the fastener head
penetrating into the integrated moisture barrier.
For roof applications, ZIP System sheathing is code recognized in ICC-ES ESR-1473 as
a combination roof sheathing and roof underlayment. When used on a wall, ZIP System
sheathing is code-recognized in ICC-ES ESR-1474 as a combination wall sheathing, air
barrier and water-resistive barrier. Both lnternational and Residential Building codes
have specific requirements on fastener types, size and spacing when attaching wood
structural panels as roof or wall sheathing. Minimum required fastening and allowable
shear values required by code are based on the assumption that fasteners are installed
flush with the sheathing surface. Due to variations in materials and limitations on
equipment, this may be difficult to achieve in some situations. According to the TECO
Tech Tip, Reduction in Shear Capacity Due to Overdriven
could be reduced to and of fasteners
to technical bulletins pub APA and€-.awww.apawood.org and wwnuJecctegted.qelrn for more information about reduced shear
capacity due to overdriven fasteners. Consult your local building official or design
professionalfor any additional nailing that may be required due to overdriven fasteners
ZIP System Sheathing has been tested against water penetration in both laboratory and
field conditions using standard ASTM tests at specified pressures. Panels were tested
with overdriven fasteners at various depths and then compared with panels that were
tested with fastener heads flush. The panels with overdriven fasteners satisfied the
same performance requirements as panels installed with fastener heads flush. Huber
Engineered Woods does not require taping or sealing overdriven fasteners. ZIP System
panels that are attached with overdriven fasteners will not void the ZIP System
warranty.
Although overdriven fasteners do not affect ZIP System sheathing's ability to resist
moisture, it may reduce the shear capacity of the fastener. Overdriven fasteners can
reduce the amount of wind or earthquake loading a shear wall is designed to resist.
This possible reduction in shear capacity is inherent with all diaphragms and shear walls
constructed with structural OSB or plywood and is NOT specific to ZIP System
products.
Please contact Huber Engineered Woods at 800-933-9220 with any questions or
comments.
Huber Engineered Woods, LLC, 10925 David Taylor Drive, Suite 300, Charlolte, NC 28262
Tel: 800-933-9220. www.zipsystem.com