Some manufacturer's tracks do not lay flat and need to be screwed down securely. I like to have the sound proofing material sandwiched between plywood or OSB. Normally I use 1/2" plywood for the base, then 1/2" Homasote or 1/2" rubber tile fatigue padding, then 1/4" on top. Cork roadbed to finish it off if the track has no road bed. The 1/4" top also helps to protect the Homasote if you kneel on the layout to reach things. 1/2" sound proofing gives you plenty of space so screws don't reach the base plywood. I see the Homasote in Home Depot is a grey color now. Does anyone know if it is now treated with a fire retardant giving it that color? I've seen it burn slowly like a wick in the past and hope it's fire proof now. For the price around $28.00 a sheet, for a glue and sawdust/news paper mix, it should be.
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