Subflooring

Subflooring is the structural layer beneath your visible flooring, providing the foundation that supports everything from hardwood to tile. Whether you're dealing with squeaky floors, water damage, or preparing for a renovation, understanding your subfloor matters. From material selection to proper installation techniques, we'll help you navigate the essentials and connect you with pros who can ensure your floors start on solid ground.

Related to Subflooring

Subflooring Articles and Advice
Lyle Hendriks  •  May 30, 2026
How Much Does Mobile Home Floor Repair Cost? [2026 Data]
Mobile home floor repair costs are similar to flooring repair costs in other types of homes. It all depends on the damage, size, and materials.
Taylor Freitas  •  May 30, 2026
How Much Does It Cost to Install Plywood Subflooring? [2026 Data]
Subflooring makes your floors sturdy and level. Learn more about the cost to install plywood subflooring and factors that affect the price.
Haley Nothstein  •  May 30, 2026
How Much Does It Cost to Replace Subflooring? [2026 Data]
If your subfloor is damaged and needs replacing, expect the project to require a professional assessment and the proper materials.
Nick P. Cellucci  •  May 22, 2026
Preparing the Subfloor Is the Secret to Gorgeous Tile Floors—Here’s How to Do It
Tile can be fragile without the right preparation. To get the most out of your floors, level the surface to provide a strong foundation for your new tile.
Alexandra Frost  •  May 21, 2026
Cracked Floor Joist? Here’s Who to Call
When you need a floor repair, including something as important as a floor joist, it’s essential to call the right contractor. A flooring specialist can repair a cracked floor joist.
Catherine Hiles  •  May 5, 2026
Plywood Calculator: How Much Plywood Do I Need?
If you’re replacing your roof or flooring, you might be wondering, “How much plywood do I need?” The answer comes through a simple calculation.
Deirdre Sullivan  •  May 5, 2026
Who to Hire to Replace the Subfloor in Your Home
Uneven floor joists don’t just lead to annoyingly sagging floors; they could be a sign of bigger issues. Here’s who to hire to fix flooring joists.
Dan Simms  •  May 3, 2026
7 Signs of Water Damage Under Your Floor
Water-damaged flooring is a headache, but signs of water damage under the floor can spell disaster. Learn how to identify an issue before it gets out of hand.
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Common Subflooring Questions

Dry rot or severe water damage may warrant a replacement, but you don’t always need to replace damaged subflooring. If your subfloor has warped because it was installed incorrectly, you can sometimes shim the panels (in other words, add a thin, wedge-shaped piece of wood to level the surface). If your subfloor bows upward, you may be able to sand it down at the joist so it’s level, depending on the extent of the damage.

The toilet flange anchors to the subfloor, usually with wood screws or cement screws, but most of it should sit above floor level at full height. When a flange is flush with the subfloor or below it, it can lead to the creation of leak paths.

While prices fluctuate because of increased demand, fewer supplies, and engineering time, OSB generally remains more affordable than plywood at $1 to $2.40 per square foot compared to the $4.50 to $10 for plywood. Cost is only one factor you should consider when deciding between OSB and plywood.

When you are laying hardwood flooring—or any other material that does not flex well with humidity—you will want to check the moisture level of your subfloor before proceeding. Flooring like luxury vinyl tile and bamboo performs better than more rigid materials in environments where moisture might be present. However, thorough testing is always an excellent preventative measure to control and monitor water in your home.

Yes, professional services include leveling and moisture testing before installation.