Home April 2015 SELLING ENGINEERED LUMBER: Getting Back to Basics



To avoid nail pops, installers should:
• Use dry lumber or engineered wood framing. Remember that even kiln dried lumber has enough water left in it to cause some shrinkage.
• When attaching plywood underlayment to a subfloor, use nails with a length approximately equal to the total thickness of the subfloor and underlayment layers. If pneumatically driven fasteners are used, apply foot pressure near the fastener to ensure contact between the underlayment and subfloor. Do not overdrive or underdrive fasteners. Ring or screwshank nails are recommended.
• Attach the panel to a clean, level framing surface. If framing hangers or connectors are attached to the top of supporting framing members, shims or furring strips may need to be placed between these hardware components to make the framing surface flush; otherwise, gaps between sheathing and framing could result in nail pops when the sheathing is subjected to construction loads or foot traffic.

3. Eliminate Squeaky Floors
Improperly installed floor systems can squeak and buckle. To avoid callbacks, take the following steps:
• Use dry lumber or engineered lumber, both of which are more stable.
• When choosing structural panels, consider the applied load, joist spacing, finish flooring material, and floor system.
• Space panels 1/8 inch at all edge and end joints, as described above.
• Allow panels to acclimatize prior to installation.
• If using a glued floor system (which is recommended), choose an adhesive meeting APA Performance Specification [glossary]AFG-01[/glossary] or [glossary]ASTM D3498[/glossary].
• Spread enough glue for only one or two panels at a time; ensure the surface is clean and dry before applying the glue.
• Apply a 1/4-inch-diameter bead in a continuous line or a serpentine pattern in wide areas. Complete all nailing of each panel before the glue sets.
• Choose the correct nail size and spacing for the joist spacing and panel thickness (refer to APA for attachment schedules and recommendations).

Following these simple strategies can help builders avoid callbacks and ensure floor systems are comfortable and durable for the life of the home. To view these and other back-to-basics installation tips, visit www.apawood.org/buildertips.