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You should replace your subfloor if you notice persistent floor squeaks, significant dips or weak areas, warped or cupped floorboards, cracked tiles, musty odors, or unstable fixtures like cabinets becoming loose. These signs suggest that your subfloor's structural integrity is compromised, and prompt replacement is necessary to ensure your home's safety.

You can install a new subfloor over an existing one only if the current subfloor is flawless and structurally sound. If there's any damage or instability, it's best to remove the old subfloor to ensure a secure and durable installation. This approach prevents future structural issues and guarantees a lasting finished surface.

Your subfloor is supported from below by sturdy joists and completed from above with an underlayment and finished flooring. The joists form a robust framework while the underlayment creates a smooth base for the visible floor covering. This layered construction guarantees maximum stability and durability, ensuring that every component contributes effectively to the overall performance of your floor.

Consider repairing your subfloor if the damage is minor and the overall structure is sound. However, if you're facing widespread decay, extensive water damage, persistent sagging, or significant rot, it's essential to replace the subfloor entirely to maintain safety and structural support. While minor repairs cost less than replacing your subfloor, substantial damage requires a full replacement for lasting results.

A flooring professional can replace only the damaged section of your subfloor when the remainder of the structure is still solid. They remove the compromised portion with precise cutting tools and install an exact match to restore integrity. This section-by-section replacement conserves resources, minimizes disruption, and maintains the overall strength of your flooring while ensuring that any necessary reinforcement is completed when needed.