Installation

Norbord structural panels are to be installed according to the APA’s (The Engineered Wood Association) Construction Guide E30 (Downloadable PDF available in APA Publications), the appropriate building code and/or the design professional’s specifications.

Below are some key installation points and tips

A nail makes a great space guide.

  • Space panels 1/8″ apart on the 4′ edges. Using a 10d nail as a spacing guide is a quick and easy way to ensure proper spacing. (See photo and watch video below.)
  • Lightly butt the T&G together.
  • Ensure the joists are aligned, uniform, spaced correctly, level and square before installing any sub-floor.
  • Install panels with the major strength axis perpendicular to supports.
  • Install T&G panels with the APA grade stamp down.
  • Fastener Spacing – consult your local building codes for local requirements, the APA Construction Guide E30 and/or your design professional’s specification.
  • Fasteners must be within 3/8″ from edges and corners to ensure the panels stay flat to the joists.
  • If using Rimboard, refer to APA’s Floor Panel T&G Trim Guidelines.
  • Gluing sub-floor panels is recommended and may be required. At a minimum, sub-floor adhesives must meet current industry test standards. If glue is used, apply only enough glue to install 2 or 3 panels at a time and fully fasten the panels before continuing.
  • Running a small bead of glue in the groove of the panels during installation adds strength and stiffness to the floor.
  • Provide 3/4″ expansion joints for every continuous section of panels exceeding 80 feet in length.  See the APA U425  for details.

Download our free app called Onsite.  iPhones and iPads can download from the Apple store and Android devices from Google Play. Great while on the jobsite or training new employees, the app has lots of videos and info and focuses on the 3 most common mistakes installing OSB. There are videos for Sub-Floor, Wall and Roof applications plus a Trouble Shooting section. The app is a guide only. Always consult the local building codes, design professional’s specifications or the APA’s E30 for details that may apply to your application.

These publications by the APA The Engineered Wood Association M300 (Cut Callbacks with Proper Spacing), G440 (Brace Walls with Wood), E305 LA (Construyendo un sistema de piso solido sin chillidos) and TT-024 (Heavily Loaded Drywall Carts) provide excellent information and guidance to anyone using structural panels and should be read in addition to the installation requirements. Downloadable PDF available in APA Publications section.

The following floor coverings may be installed over Durastrand Sub-Flooring

  • Commercial and residential carpet with under pad
  • Ceramic tile and lightweight concrete*
  • Hardwood floors**
  • Vinyl flooring requires a suitable underlayment***

Always follow the floor covering/installation product manufacturer’s application recommendations.

* Follow the industry and flooring manufacturer’s installation instructions with special attention to the requirements regarding the jobsite moisture conditions for the building, sub-floor and finished flooring before, during and after installation.
**Hardwood flooring should be installed per the NWFA guidelines and/or the flooring manufacturer’s instructions. Special attention must be paid to the moisture content of the sub-floor and the flooring and relative humidity at the time of installation.
*** The APA L335M for underlayment installation can be found in the Resources under the APA.

Prevent Buckling with Proper Spacing

Resources

Visit the Resources page for more information on product documents, forest certification, APA publications, seminars & trade shows.