from what i hear, those asphalt based products are great for on the floor applications, but can tend to peel away when heated up in a vertical or overhead application. i wouldn't have a problem with using it for the floor, since it can't fall down if it's on the floor... but i think i'd spend the coin and use a butyl based product for vertical and overhead, like doors, roof, etc. i spent the extra and i got raammat from raam audio. he had some 'oops' rolls of raammat that didn't make the grade on the glue, and was selling them pretty cheap. if i remember right, i think it may have been around a buck a foot for it. (
http://www.raamaudio.com/) i don't know if he still has any or not, you could call him or email him, he's a real cool guy and is good to get back with you. he even called me personally to verify my order. anyhow, i bought that to put on the floor, but i got the butyl based raammat bxt II to put in vertical and overhead. here's a site to thumb through to see that different products serve different purposes for sound dampening. (
http://www.sounddeadenershowdown.com/cgi-bin/index.cgi) the mats help to kill resonance, while the foam helps to kill the sound that makes it through the mat. when i redid my carpet, i got the mass backing on the carpet, plus i put the raammat (like dynamat, hushmat, etc.) and got some foam too. so mat, foam, carpet. just thumb through the info, see what you wanna do or not. i got my ensolite from raam audio, (inner door panels and such) but for the large areas i used some foam mat from
http://www.thefoamfactory.com/ i used the gymnastic rubber, figured it's close to same same. used the 1/4 inch on the floor, glued it down with some spray adhesive, 1/8 inch on the roof. still gotta do the 4 doors, but did the back doors and the rest of the truck and it's pretty darn quiet. anyhow, blah blah blah... i'm not saying i'm right or anyone else is wrong, but i do think that certain products are better for certain applications. have heard of people having problems with the asphalt based stuff slipping and falling down and making a nasty mess in the summer months. but you being in wisconsin, you may be okay. just do some homework, it's completely your choice, good luck with whatever you decide. keep us posted man. branndon