Plywood subfloor in conservatory

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28 Jun 2015
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Hi,

I've recently removed solid wood flooring from a conservatory, with the intent of replacing it with engineered wood. As the engineered wood is quite thin (13mm), I intend to first lay a sub floor of plywood, then float the engineered wood on top. The old solid wood flooring has been nailed battens with installation between them, and has some sort of plastic covering its back, see picture below.

A few questions:

1) Is this the right stuff for the job? http://www.wickes.co.uk/Wickes-Structural-Spruce-Plywood-18x1220x2440mm/p/110036 ?
2) Will I need to treat/seal the ply before installation?
3) Should I use a DPM between the battens and plywood?

Many thanks,
Eric

IMG_20150627_172055-nopm-.jpg
 
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