Plywood

Do you need plywood under laminates?

Short Answer
Plywood underlayment is required in areas where you require a very smooth subfloor. Underlayment is a thinner material that lies over the subfloor. They provide a smooth, flat surface, without voids from knots or other surface imperfections common with subflooring.

Detailed Explanation

Plywood is not necessary for laminates, though it can provide an additional support and help in moisture retention.
The existing subfloor can be made even by using plywood underlayment. They can also provide a barrier against moisture. They help in absorbing sound and impact vibration hence reducing noise. It is important to check with the laminate manufacturer before deciding the underlayment material.
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