In terms of construction materials, what size of plywood is commonly referred to for subflooring?

The most commonly used size of plywood for subflooring is 3/4 inch thick by 4 feet wide and 8 feet long. This thickness provides the strength and durability required to support flooring and any further loads without significant flexing or warping. The 3/4-inch thickness helps to evenly distribute weight across the floor joists, reducing the risk of sagging or damage over time.

While there are other thickness options like 1/2 inch, 5/8 inch, and 1/4 inch plywood, they do not typically provide the same level of structural integrity necessary for subflooring applications. Thinner materials like 1/4 inch are generally used for applications such as wall sheathing or interior paneling, while 1/2 inch and 5/8 inch plywood may not offer adequate support when used as a subfloor. Hence, the 3/4 x 4 x 8 dimension is the standard for ensuring a sturdy and reliable subfloor that can withstand everyday use.