Please note that manufacturer’s guidelines as all manufacturers would recommend replacement for new however;
The purpose of an underlay is to level minor unevenness in the sub-floor and to provide both acoustic (sound) and thermal insulation.
To avoid problems caused by rising damp you must always lay a plastic foil/sheet. If your underlay has all these qualities, and is in good order, then yes.
You are also recommended to check any warranty details for the individual manufacturer as some may stipulate the use of their own underlay only. Whilst your own underlay may be just as good, or maybe even better, it could invalidate the warranty.
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