How Thick Should Subfloor Underlayment Be?

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For a Subfloor in Good Condition

  • Before installing most types of flooring, you must first install some type of underlayment on top of the existing subfloor. If your subfloor is in good condition, 1/4-inch plywood is usually sufficient to provide a quality foundation for your flooring.

For a Damaged Subfloor

  • If your subfloor is in poor condition, installing a thicker underlayment might be necessary to compensate for imperfections in the subfloor. In such cases, you can use up to 3/4-inch plywood.

Bottom Line

  • Your should evaluate your home's subfloor to determine how thick your underlayment should be. Generally speaking, 1/4-inch plywood will do fine, but you can use up to 3/4-inch plywood to provide further support for your floor.

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