Sound dampening

[scenic760]

In pulling out all my boxes of stuff to put this Suburban back together, I found my boxes of Kilmat...

I have (2) 36 sq ft boxes and vaguely remember my plan to be do the floors with the Kilmat and with the ceiling, doing foil backed foam in between the headliner almost like a wall assembly. Also I was planning to Kilmat the doors, under the door panels.

I have read several of the threads on sound deadening and had a couple of questions now:

1. If I don't put Kilmat on the ceiling, will the insulation and headliner muffle enough of he sound or is it just going to resonate through the interior?
2. I see a lot of people putting the Kilmat on the inside of the door's exterior skin. I see why this would be superior to door under the plastic panels but seems like a REAL PITA. Does it make THAT much difference?

Thanks all!

 

[TotalyHucked]

Can't answer about the ceiling as I have never applied it up there. But as far as the doors, it makes a HUGE different putting it on the backside of the outer skin. I've done this with both newer trucks and vintage ones. You don't need much either, I just put 1-2 squares of whatever size I can fit through the access holes in the door. It just takes the "tinny"-ness out of it.

 

[Bloodhound1981]

I definitely agree with the Kilmat on the outer door panel. You don't need to use a lot, there or anywhere else. I put one sheet inside each door and totally killed the tin sound. I did the roof as well before adding the headliner, and you don't have to go crazy over every square inch to get good results.

 

[PrairieDrifter]

Agreed on the doors. It does completely change it.

My burb was unbearable in rain storms until I did the roof. It was sooo loud. Cut down the resonance a lot after the roof like in general. Helps the sound system too lol. Does help with temp as well. I'll be doing the closed cell foam as well.

That said, I haven't had a headliner since I tore the old junk out, even after the deadner. Someday.

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[scenic760]

Agreed on the doors. It does completely change it.

My burb was unbearable in rain storms until I did the roof. It was sooo loud. Cut down the resonance a lot after the roof like in general. Helps the sound system too lol. Does help with temp as well. I'll be doing the closed cell foam as well.

That said, I haven't had a headliner since I tore the old junk out, even after the deadner. Someday.

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CLEAN install!!

 

[PrairieDrifter]

CLEAN install!!

Appreciate it! Pictures are good at hiding flaws lol. 5 sheets of 24x48 will do the roof dang near perfect if you take your time lining them up.

 

[MikeB]

I'd be concerned that material on the underside of the roof may come loose, due to the roof's exposure to the sun.

Then again, if you live in North Dakota...

 

[Frankenchevy]

I'd be concerned that material on the underside of the roof may come loose, due to the roof's exposure to the sun.

Then again, if you live in North Dakota...

Once you get most CLDs applied to a well prepped surface and rolled down, they are pretty unlikely to ever come off without quite a bit of effort.

 

[TotalyHucked]

Yeah I know a bunch of people in the SE that have put that stuff on their roofs with no issues.

 

[Fat 454]

i'm really conflicted about using this stuff. It has been a HUGE job to remove from previous projects, and have found that it traps moisture on the floor leading to rust. I am NOT putting this stuff back in our new truck after a full internal clean out and respray, and am going to try a combination of the old school felt and a layer of foil for heat under the OEM floor mat. At least that can be pulled up to check for moisture from time to time.

I am sure I am in the minority here, but am willing to sacrifice some comfort for ongoing maintenance of the truck body ( mind you we don't live in the desert anymore ... )

 

[PrairieDrifter]

I'd be concerned that material on the underside of the roof may come loose, due to the roof's exposure to the sun.

Then again, if you live in North Dakota...

Hasn't budged at all. We get over 100F and high humidity too. Don't you worry about that!

Right now it is -15F without windchill lol

 

[Frankenchevy]

i'm really conflicted about using this stuff. It has been a HUGE job to remove from previous projects, and have found that it traps moisture on the floor leading to rust. I am NOT putting this stuff back in our new truck after a full internal clean out and respray, and am going to try a combination of the old school felt and a layer of foil for heat under the OEM floor mat. At least that can be pulled up to check for moisture from time to time.

I am sure I am in the minority here, but am willing to sacrifice some comfort for ongoing maintenance of the truck body ( mind you we don't live in the desert anymore ... )

You could try lizard skin. It’s a paint on deadener.

 

[scenic760]

i'm really conflicted about using this stuff. It has been a HUGE job to remove from previous projects, and have found that it traps moisture on the floor leading to rust. I am NOT putting this stuff back in our new truck after a full internal clean out and respray, and am going to try a combination of the old school felt and a layer of foil for heat under the OEM floor mat. At least that can be pulled up to check for moisture from time to time.

I am sure I am in the minority here, but am willing to sacrifice some comfort for ongoing maintenance of the truck body ( mind you we don't live in the desert anymore ... )

Interesting you brought this up because without the headliner on, sometimes I will go out in the morning and see condensation on the inside roof! I'm assuming it is happening on the backside of all the body panels and just burns off?

Condensation getting stuck was my big worry about sticking down the Kilmat and not getting every part of it ONE HUNDRED PERCENT sealed against the surface...

I wonder why if that is why the headliner does not have any insulation behind it, to allow the condensation to evaporate?

 

[Grit dog]

Once you get most CLDs applied to a well prepped surface and rolled down, they are pretty unlikely to ever come off without quite a bit of effort.

While I don’t have plans to do the roofs in either truck I wondered that as well. But between yours and Hucks experience I’ll chalk it up as a non issue.

 

[Grit dog]

i'm really conflicted about using this stuff. It has been a HUGE job to remove from previous projects, and have found that it traps moisture on the floor leading to rust. I am NOT putting this stuff back in our new truck after a full internal clean out and respray, and am going to try a combination of the old school felt and a layer of foil for heat under the OEM floor mat. At least that can be pulled up to check for moisture from time to time.

I am sure I am in the minority here, but am willing to sacrifice some comfort for ongoing maintenance of the truck body ( mind you we don't live in the desert anymore ... )

I can see where that may be a concern in a daily/work vehicle where it snows a lot.
Or for someone who just doesn’t really take care of their stuff.
Barring those conditions I’d call it a non issue, especially if you have a full rubber floor mat or use floor mats on the carpet.
Even then, I don’t think moisture is going to creep under the sheets once they’re good n stuck. And it would only be an issue in the low spots.
To your point though, I just sold a 1975 pickup, Dodge with the gas pedal that bolted thru the floor covering mat. And even though that truck had no rust thru elsewhere and only 44k miles and hadn’t been driven in 30-40 years I’d surmise, the drivers floor board was rotted right at the gas pedal location the worst and it migrated from there.
But it probably saw 10+ years of wet shoes (local truck and seattle = rain for 6mo straight) and soaked the jute padding through what was originally screw holes thru the mat.
Judging by the pic if your restored 2wd burb I’ll surmise the carpet won’t be getting covered in mud and washed out with a garden hose so you should have nothing to worry about.

Kinda like the folks who get a rust hole in their 40 year old gas tank on a truck that was probably used like a TRUCK for 20 years and are worried about the new tank rusting through. Seems like a problem for whoever inherits it 50 years from now after we’re pushin daisies.
And if you’re only 20 years old, it will be a retirement project to replace the gas tank again….maybe.