What is the proper way to build up a floor to prepare for vinyl flooring? I'm building a mud-room in the garage attached to the house, 5' by 13' .

Presently I have the joists installed and am ready for subfloor. I am planning to use 3/4" T&G UDL plywood, glued to joists with construction adhesive and screwed in with 2" screws. I was then going to sand and fill where necessary, then put the vinyl directly on top.

Do I need to put another layer of 1/4" plywood on top of that, or if it is smooth, just put the vinyl directly on top of the 3/4"?

Any comments or suggestions are welcome!

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6:42 PM

At this point I have no replies, but am pretty sure I answered my own question. Vinyl will require 1/4" underlayment on top of the 3/4" T&G subfloor.

For any amatueurs like me, it is well explained here:
http://www.umass.edu/bmatwt/publications/articles/underlayment.html

Still, any comments or suggestions would be welcome!

You did the right thing. Its difficult for me to post everyday. Been a busy week.
Make sure the 1/4" is nailed 2" along the seams and 6" in the field of the sheet.
A air stapler works great for that.

No worries, thanks for the feedback!
I will attempt to get ahold of a stapler and compressor.