Yes, 5/8-inch plywood is a perfectly acceptable subfloor choice, provided your floor joists are spaced no more than 16 inches apart. It is lighter and budget-friendly, but for a stiffer floor and wider joist spacing, 3/4-inch plywood is highly recommended.
For most residential projects, 3/4-inch plywood is the industry standard and preferred choice, while 5/8-inch serves as an acceptable budget or lightweight alternative. The right choice depends primarily on your floor joist spacing and the type of finish flooring you plan to install.
Yes, in the lumber and construction industry, 𝟏𝟗/𝟑𝟐 inch is considered the standard actual thickness for a nominal 𝟓/𝟖 inch OSB (Oriented Strand Board).
The recommended plywood thickness for a subfloor depends primarily on your floor joist spacing. For standard joists spaced 16 inches on center, use 5/8-inch (or 19/32-inch) plywood. For wider spans of 19.2 to 24 inches on center, or for exceptionally heavy finished floors like tile, use 3/4-inch (or 23/32-inch) plywood.
3/4" plywood is usually 23/32" (about 0.72"). 1/2" is commonly 15/32" (0.47"), and 5/8" is about 19/32" (0.59"). Always measure before cutting dadoes or installing cabinet hardware.
The difference between 3/4 and 5/8 depends on whether you are looking at them as mathematical fractions or musical time signatures.
For standard residential flooring, 3/4-inch (23/32") plywood is the industry standard and best choice for long-term durability and minimal floor bounce. If you are working with tight budgets or joists spaced 16 inches on center, 5/8-inch (19/32") can be used, but 3/4-inch is strongly recommended.
1/2" plywood is too thin for most subfloor applications and will flex or sag, especially if joist spacing is 16 inches or more. This can lead to squeaky floors and structural issues. -> The minimum recommended is 5/8" plywood, but 3/4" is preferred for strength and long-term durability.
Types of Subfloor Materials. Several subfloor materials are commonly used in construction. The choice depends on factors such as budget, building codes, and the type of finished flooring. The most commonly used materials include plywood, oriented strand board (OSB), and concrete.
Particle Board (Chipboard)
Particleboard is widely used to make furniture, as well as the construction industry as a cheaper alternative to plywood. It's commonly used for shelves, cabinets, and tabletops, as well as subfloors and wall panels.
Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood.
What thickness plywood should I use for a subfloor? The right thickness depends on your floor joist spacing. For joists spaced 16 inches apart, 19/32-inch plywood is the minimum, but 23/32-inch is better.
5/8 is thicker than 19/32.
Yes, you should leave a gap between plywood subfloor panels—typically 1/8 inch—to allow for expansion and contraction due to moisture changes. This prevents the plywood from buckling, which can cause high spots and squeaky floors. It is also recommended to leave a larger 1/4-inch gap at the perimeter walls.
The overall best subfloor material is tongue-and-groove plywood (specifically Exposure 1 rated). It provides superior moisture resistance, holds nails firmly to prevent floor squeaks, and won't delaminate or swell heavily if it gets wet during construction. For maximum durability, premium resin-infused OSB like AdvanTech is widely considered the best heavy-duty option.
For added strength and stability, a double-layer subfloor is often recommended. In this configuration, two layers of plywood are installed, with the top layer offset from the seams of the bottom layer. By staggering the seams, the subfloor's overall strength is enhanced, reducing the risk of deflection or squeaks.
One of the biggest challenges with subfloors is moisture. Plywood that isn't properly treated or dried can absorb moisture from the environment, leading to swelling, warping and even mold growth. This can cause flooring materials to lift, separate or degrade over time.
CDX (Plywood) is generally the better choice if your budget allows. While OSB is cheaper and highly uniform, CDX is stiffer, holds fasteners much better, and won't swell or delaminate as severely if exposed to rain during the framing process.
If you're gluing the new flooring to the subfloor, use a sander to remove paint, oil, wax, adhesives, sealers or other material and then thoroughly vacuum off dust and debris. Nail-down or floating floors may be installed over existing vinyl as long as it's no more than two layers thick.
No, "5/8-inch" plywood is a nominal measurement. The actual thickness is typically 19/32 of an inch (about 0.594 inches).
For most residential projects, 23/32-inch (commonly called 3/4-inch) tongue-and-groove CDX plywood is the best choice. It offers an optimal balance of strength, stiffness, and moisture resistance, while its interlocking edges prevent floor squeaks. For superior moisture protection during construction, premium resins such as Advantech are widely considered the top tier.
You need exactly 4 sheets of 4×8 plywood for a 10×12 floor, as this size totals exactly 120120120 square feet and each sheet covers 323232 square feet.
Standard subfloor plywood is typically 𝟑/𝟒 inch (nominal), which actually measures 𝟐𝟑/𝟑𝟐 inches in thickness. For joist spans up to 16 inches on-center, a slightly thinner 𝟓/𝟖 inch (actually 𝟏𝟗/𝟑𝟐 inches) plywood is also an acceptable and widely used standard.
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