I have 1000 sf of subfloor over finished basement in a 1970s two story residence. We want to achieve maximum sound proofing on this floor with open den/living room /foyer. Unfortunately I did not add soundproofing to the basement ceiling five years ago.
We are "set" on using a mid range engineered 5 inch by 3/8th inch plank . We want contractor to pull up all carpet so we can address 1/2 tongue in groove sub floor and seek to treat certain squeaks and gaps and also pull up every other row and install Roksul in cavities- I think i can place /push them in . Then we want an underlayment with best acoustic properties say ECO ULTRA 980 or Floor Muffler but this decision gets confused by literature regarding a need to glue it down with say normal glue or not. Then install wood planks with more expensive glue Roberts 1535 at say $170 for 4 gal pail . The various posts say no need to glue down underlayment all . The acoustic glue is expensive I need 5 4 gallon pails . Any experiences ?