Attaching CDX Plywood to the subfloor as with other underlayments use fasteners, which should each penetrate the underfloor (subfloor) by about 3/4's of an inch. This should not protrude into the subfloor if possible by more than 1/8 inches. If the CDX Plywood underlayment is being installed through older floors, or floor coverings that have been there previously, then the depth of the floor covering should be considered before choosing the nail type to adfix the plywood to the subfloor.
What Type of Plywood is the Best for Flooring?
Trying to Determine the Best type of Plywood to use can be a bit of a challange. However don't just pick up any piece of plywood.
Make sure that the plywood you use it the right type for the job your looking at doing (underlayment) There is Resilent Plywood for Vinyl Flooring, and then you're using 1/4 inch exterior grade AC Plywood. Make sure that the plywood is smooth and the smooth side should be facing up. For Wood Flooring 1/4 inch to 1/2 inch plywood exterior grade is best. There is no need to choose a grading here since smoothness is not an issue.
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