Do i need dynamat?

[BuddyP]

In the process of my project I had the underside of the body undercoated with line-X bedliner spray. With that I don't see a reason to use dynamat on the floor. Would you guys agree? I will still use it on the roof and doors.

[Joker69Camaro]

I would still dynamat the entire floorboard. The line-x will help, but the dynamat will have more vibration control. It will also be a good start to a thermal layer. Just my $.02

Jeff K

[NightDiver]

I would still dynamat the entire floorboard. The line-x will help, but the dynamat will have more vibration control. It will also be a good start to a thermal layer. Just my $.02

Jeff K

I would agree... While any single layer is better than nothing, having a layer on both sides of the underbody will only help. Not only that, but dynamat will provide better thermal insulation which, anyone who has nearly melted the soles off their shoes during a long road trip can tell you, is more important than most people think...

[1969CamaroRS]

It will also be a good start to a thermal layer. Just my $.02Jeff K

I don't think the sound vibration dampeners block heat very well. Least when I put it on my floor (Second Skin's Damplifier Pro), the floor was either cold or hot depending on the outside weather. Once put a heat barrier (Heat Wave Pro) on then I noticed a huge difference.

[Vegas69]

I agree, Ed. I drove my car with sound deadener only and the floor would burn my foot without carpet. The heat wave pro did make a huge difference.

[Joker69Camaro]

Exactly! Which is why I always recommend a layer of Dynaliner or equivilant over the dynamat also.

Jeff K.

[wmhjr]

Agreed. It doesn't cost all that much, and there is little downside.

[Tony_SS]

I would use it. I just bought a box and can't wait to get it in there, along with some thermal jute and then the factory carpet and jute... should be pretty quiet inside after that.

[Chad-1stGen]

Well there is one downside... weight

[NightDiver]

Well there is one downside... weight

more weight just means more reason to go for that bigger engine... horsepower and torque will cure everything... lol

[Chad-1stGen]

more weight just means more reason to go for that bigger engine... horsepower and torque will cure everything... lol

On the street yeah maybe. Anything performance related except maybe drag racing then nope.

EDIT: FYI I do have my entire floorboard, firewall, doors and quarters done but I'm not sure I would do it again. Never drove the car without the stuff so I can't say for sure, but I get so much wind noise through the windows that I don't know that it made much difference.

[Tony_SS]

On the street yeah maybe. Anything performance related except maybe drag racing then nope.

EDIT: FYI I do have my entire floorboard, firewall, doors and quarters done but I'm not sure I would do it again. Never drove the car without the stuff so I can't say for sure, but I get so much wind noise through the windows that I don't know that it made much difference.

I've been driving mine with skimpy jute and carpet only, and it's noisy. I expect to notice a big difference.

15lbs isn't too bad really. It's low and centered weight. Not the worst.

[Ron.in.SoCal]

I've been driving mine with skimpy jute and carpet only, and it's noisy. I expect to notice a big difference.

15lbs isn't too bad really. It's low and centered weight. Not the worst.

Yeah, but you'll need four boxes or so...

[Ron.in.SoCal]

^ I'm w you Chad on the weight thing. One box of Dyna wieghs what, 15 something lbs? This month's Super Chev had an article on Boom Mat. 9lbs total on a second gen. So hard to really compare one brand to the next wihtout having installed/driven on both, but it sounds like a winner to me...

[Hunter68]

would you guys recommend dynamat or the almost carpet looking stuff with the silver lining? and how do you say the roofing material holds up pretty much looks like the same thing and even cheaper than dynamat

[aps63]

Like most things in life, you get what you pay for.
Dynamat is more expensive but if it keeps out just alittle more heat and noise then it's worth it.
I've never used the roofing stuff but, I've heard horror stories about it being used.
Keep to the stuff that is made specifically for car interiors. The money will be well spent.

[Hunter68]

whats so bad about it? its essentially the same thing

Like most things in life, you get what you pay for.
Dynamat is more expensive but if it keeps out just alittle more heat and noise then it's worth it.
I've never used the roofing stuff but, I've heard horror stories about it being used.
Keep to the stuff that is made specifically for car interiors. The money will be well spent.

[wmhjr]

whats so bad about it? its essentially the same thing

No, it's not. About the only thing similar about it is that it's "supposed" to stick on, and it's "supposed" to reduce some sort of either noise or heat. How it does it, how long it does it, and how well it does it are about as similar as filling teeth with proper materials and filling teeth with concrete.

There are plenty of threads here that discuss this issue.

[NightDiver]

whats so bad about it? its essentially the same thing

While performing similar functions, they are not essentially the same thing... Roofing stuff is meant to be affixed (nailed along with shingles) to a relatively horizontal surface (roof). While this may not cause much of an issue for flooring, using the stuff on doors, roof panels, deck lids, or any other vertical or inverted horizontal surface is just asking for it to soften and shift as it gets hot. In addition, because it is asphalt based rather than foam based, the mats and adhesive used in roofing material give off a nasty smelling set of fumes as they get hot. If you have ever passed a construction site with hot asphalt or somewhere they were replacing the tar on a roof, you will know what your interior will smell like every time your car sits in the sun for any length of time.

[GNon18s]

I think the whole Dynamat thing is over rated in most cases. I have used it in certain areas, but my car is noisy because the windows are down, the turbo is hissing, and it has 3" exhaust... not because I didnt put 25lbs of Dynamat under the carpet. Everybody thinks because they saw it in some other build thread that they have to do it too. Just my opinion.