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Installing underlayment on concrete, confused about taping perimeter

PLIERS | Posted in General Questions on

Hi hope all is well. I’m installing underlayment  for lvp on a concrete floor. Instructions say to tape the perimeter with waterproof tape as well. I’m confused here, if it is butted against the wall how to I tape it? Am I supposed to leave a gap and then tape it to the floor or tape the underlayment to the wall?

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