Don't use it at all as the additional weight is detrimental on the performance of the car. I try to save weight wherever I can. If you do the doors at all, just one piece on the inside of the outer sheetmetal is all that's necessary. Wholesale applications to the entire interior plus trunk like I've seen can add a bunch of total weight to the car. People overuse dynamat like crazy. it's useless in a trunk too.
It's for sound deadening and it takes very little to accomplish that. Use it only when it's known that a panel needs it and use it sparingly. Floors don't hardly need any if at all. Underside of the roof can help but wholesale application isn't necessary. Just a few pieces will do it.
This is actually what I ended up doing. I bought a heavy carpet with mass backing and insulation, so I didn't care to over do it. I did put on sheet of dynamat inside of each outer door shell, as close to the hinges as possible to avoid adding stress to the hinges. I'd say I ended up using about 50 sq ft of dynamat.Don't use it at all as the additional weight is detrimental on the performance of the car. I try to save weight wherever I can. If you do the doors at all, just one piece on the inside of the outer sheetmetal is all that's necessary. Wholesale applications to the entire interior plus trunk like I've seen can add a bunch of total weight to the car. People overuse dynamat like crazy. it's useless in a trunk too.
It's for sound deadening and it takes very little to accomplish that. Use it only when it's known that a panel needs it and use it sparingly. Floors don't hardly need any if at all. Underside of the roof can help but wholesale application isn't necessary. Just a few pieces will do it.
Dynamat is for sound deadening and the foil can act as a radiant barrier against heat. It doesn't take much Dynamat to deaden a panel. Beyond that, there are better and lighter materials for sound insulation which it sounds like you are after.I covered my entire floor before putting in the new carpet with jute backing. I'll put some more on the door skins the next time I pull my panels off. I don't care about a few extra pounds. I'm not trying to shave tenths off the quarter mile. My car is to drive and enjoy. It made quite a difference in exterior noise sound.
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