I just finished lining the doors of my '99 Supercab with Dynamat Xtreme. I have (2) 12"x36" pieces left over. Where should I put these (floor, back wall, ceiling, ...) to get the best sound-proofing bang for my buck?

 

Well the floors already have some sound proofing from the factory even though it is very little. What I would do would be the rear doors of your Scab, the roof, or the rear wall. The firewall already has a very thick sound absorption mat. However, to be completely frank. You will more than likely not even notice a difference with only doing one portion. Where you will notice a huge difference is once you have doors, floors, roof and rear wall done. After those are done you will have more of a quiet ride like a luxury car has where you gotta listen close to hear if the engine is running.

 

Just sprayed the rear doors and behind back seat of 97 screw. What a difference!!!! Had to be careful with the spray (Blue Magic 100% rubber undercoating spray) totally deadened the noise coming from the rear. Contemplating front door panels next..

 

I would consider the back of the cab. My plastic bedliner rattles pretty good when I have it cranked. Sounds and unwanted noises like to come in through those vents on the cab. I think that would give you your best bang for the buck.

 

Do you cover up the rear wall vents? Most of my noise seems to come through these but I am concerned about closing them off.

 

I don't know the exact effects it would have, but I have heard of people closing off one of them. Maybe someone else on here might have an answer.....

 

Well guys I strongly suggest you DO NOT COVER THE CAB VENTS!!!!! If you have alot of sound coming from them you can use an open cell foam or fiberglass insulation to help reduce the amount of noise but do not seal them where air is unable to escape or you will have serious moisture problems. Anyway, you can however use a piece of dynamat and adhere it directly to the flap on the vent just make sure that the vent can still operate. Oh, you also can cause the cab to become pressurized while driving if the vents are sealed. Ever notice your ears pop when going over mountains??? Imagine what would happen if your going up that mountain with a perfectly sealed cab (think airplane here) and opened that door or window (pressurized at sea level remember) once you reached the summit and decided to take pictures. One word here BOOOOOM!!

Nuff Said! Leave the vents open for more than one reason.

 

Well now that you mention it, that makes a lot of sense. Thanks for the reply and information.

 

Ha ha ha! Isn't that what you're looking for? More BOOM!!!!!!!!!!!!!!!