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Hi B, a ply sub floor really depends on the condition of what your new flooring will lay on, they are more essential when laying a glued down floor as it needs to be as level as possible, you need to know what kind of flooring your having, if its a flooding floor then a ply sub floor isn't essential better to spend this money on a good quality sound proofing membrane instead, if your existing floor is floorboards and uneven with big gaps then a sub floor would help but it would only need to be a few mm's thick. A ply sub floor is neither a waste of time or essential cos its certain factors that decide this, but its become standard for some people to apply a sub floor when in many cases its not needed, it can also be used when floors from different rooms are at different levels so in these cases it makes sense to apply,
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littleK
Good to know, thanks. That was my thinking.
Now, is a ply subfloor worth it or not? One company quoting thinks it's essential, another said it's a waste of time.