What Type of Luan Plywood to Use as Underlay?
Trying to Determine the Best type of Luan Plywood to use can be a bit of a challange. - 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.