My pool is almost ready, two day acid treatment done tomorrow,then start up, I noticed that there is a gap between the deck and the coping, is this the responsability of the pool maker to fill in? or is it an additional cost?
What is in the contract?
I normally see it added but not by all gunite pool builders. Some just leave a tear away foam between a concrete deck and the pool shell.
If the deck is provided in the pool contract the mastic should be included. Sometimes there can be a gray area if a separate contract for the deck is used or you are using your own deck contractor.