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Screenings retain moisture and will eventually lead to the downfall of the install. Sand allows water to flow from the install, securing it's integrity. If you are using it to level your pad, any more than a 1/2" and it will show in time. Take the time to get your base right, and use the materials the manufacturers recommend. Check with your local aggregate yard, the same one where road guys get their stuff. Here they call it washed sand. Get onto the ICPI or Belgard site and get the sieve analysis for the sand and give it to them to match up. There is bound to be a proper material available.
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