laminate floor underlayment installation?
do I need to glue the underlayment to the OSB board subflooring? before laying glue-less laminate? or do I can also flow it there...? when laying underlayment, do I let the face with waterproof membrane facing down or facing up as the type I purchased is with a waterproof membrane foam type... and when the underlayment meet the wall, do I make it a bit more so that all laminate can seat on it at edge and then I can cut out extra by utility knife...? thanks for answering....
No, don't glue the underlayment down. Let it lay were it is laid, the edges meeting each side of the underlayment should be 'taped' to each other, unless they have a factory way of adhering edge to edge.
Water proof membrane always face down.
Where the underlayment meets the wall; yes you could butt it there and cut the excess out to get a snug fit.
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