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.
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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