All materials that are considered permissible for use as underlayment for hardwood flooring except for

All materials that are considered permissible for use as underlayment for hardwood flooring except for

• A. OSB Plywood
• B. CC Plywood
• C. CDX Plywood
• D. Particle Board

Answer: (D)

Underlayment for hardwood flooring needs to provide a flat, hard, and dimensionally stable surface that can hold fasteners and resist moisture-related changes. Particle board fails on these fronts: it tends to swell and degrade with moisture, doesn’t hold nails or staples well, and can crush or crumble under regular use, leading to uneven floors and squeaks. The other options—panel products like OSB and plywood grades such as CC and CDX—are generally suitable as underlayment because they’re stronger, more stable, and better at accepting fasteners, especially when installed with proper moisture control. So the material that should not be used as underlayment is particle board.

Underlayment for hardwood flooring needs to provide a flat, hard, and dimensionally stable surface that can hold fasteners and resist moisture-related changes. Particle board fails on these fronts: it tends to swell and degrade with moisture, doesn’t hold nails or staples well, and can crush or crumble under regular use, leading to uneven floors and squeaks. The other options—panel products like OSB and plywood grades such as CC and CDX—are generally suitable as underlayment because they’re stronger, more stable, and better at accepting fasteners, especially when installed with proper moisture control. So the material that should not be used as underlayment is particle board.