I am in the roofing business and I can get a 198 sq. ft. roll of butyl based 30 mil. underlayment for around $120. There is no asphalt in it.
Do you think I should use this as sound deadening. I don't see any difference in the stuff I can get and the "sound deadening" that sells for 4 times as much. Maybe the thickness, which I can double mine and still be cheaper. And this stuff does not have an aluminum top layer.
What do you guys think?