When securing subfloor panels to wood joists, what is the generally recommended fastener schedule to ensure adequate strength and prevent squeaks?

Question: When securing subfloor panels to wood joists, what is the generally recommended fastener schedule to ensure adequate strength and prevent squeaks?

Answer options:

• Nails every 600 mm along joists and around perimeter. ✅ Screws every 300 mm in the field and 150 mm along end joints and perimeter, along with construction adhesive.
• Staples every 150 mm along all joists and adjacent panel edges.
• Long screws at 1200 mm intervals, relying primarily on the adhesive.

Correct answer: Screws every 300 mm in the field and 150 mm along end joints and perimeter, along with construction adhesive.

Explanation: A combination of screws and construction adhesive provides superior holding power and helps prevent squeaks. A common schedule is screws at 300 mm along intermediate joists and 150 mm at panel ends and perimeter. Relying solely on nails or widely spaced fasteners can lead to movement and squeaks over time. Staples are not typically recommended as the sole fastening method for subflooring due to their lower withdrawal resistance compared to screws.