Green Glue Noiseproofing Joist Tape is used between sub flooring and joists to eliminate squeaking floors. It is also a great compliment to our Noiseproofing Compound when working to eliminate impact noise. The general cause of noisy floors is the rubbing of the sub floor on the joists. Our Joist Tape provides a cushion for the sub floor to sit on so that this common problem can be easily eliminated.