New answers tagged laminate-floor
I'd personally choose 1/2" OSB. It's inexpensive, and ought to hold up reasonably well, even against limited moisture. DO NOT USE particle board. It swells way up and then DISSOLVES if it gets wet.
Your local bodyshop has tons of cardboard they are more than happy to get rid of. Large boxes that hoods and body panels are packaged in. 3 or 4 hood boxes will cover a room.
I would carefully consider the full cost of the job as opposed to just looking at the cost for the underlayment material. In the complete analysis how does the cost of the underlayment compare to the cost of the flooring itself? The total cost of the project also needs to consider the potential future cost of ripping out substandard materials for later ...
There is no doubt that particle board or MDF would be less expensive than plywood, especially initially. However, particle board is not suitable as an underfloor (or underlayment) unless it is covered by a waterproof membrane such as vinyl. When particle board is wet long term, it basically dissolves.
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