Expanding foam in roof??
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Elder User
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Expanding foam in roof??
Ok I have pounded out most of the dents in my roof, took out the center support rearched it and welded it back in with two more stainless 1" supports. What I'd like to do is fill in the edges where all the voids are with expanding foam. Before that I will spray fluid film all the way around then undercoat. After all that I will add Dynamat to the roof before installing the headliner. Does this sound like a good idea??
Lead Driver
Joined: Nov 2000
Posts: 6,632
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From: Albuquerque
If it were me....
I would spray a sound deadening uncoat in there followed by some dynamat or foil covered sound deadening material.
It worked well for me.
I'm not sure what fluid film does.
I would spray a sound deadening uncoat in there followed by some dynamat or foil covered sound deadening material.
It worked well for me.
I'm not sure what fluid film does.
Laughing Gas
Joined: Aug 2007
Posts: 1,107
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From: Spokane, WA
Granted this is just my opinion, but.....
DO NOT spray in foam into the voids in your roof! You will regret it. The reasoning behind this is two-fold. One, the body of the truck will flex, and the foam will begin to separate in places and you WILL end up with *squeeeeeeaks* all throughout your roof that you'll not be able to get rid of....the second issue is that the foam will retain moisture, and will allow it to rust your roof out from the inside.
I actually considered doing the same thing, but upon reading a number of old posts on this subject, and the fact that I've worked with that liquid expanding foam before, it sunk in that that was not what I wanted in the roof of my truck. I'd go with the spray-in bedliner, as it's a protective coating, it doesn't absorb moisture, and as it's bonded to the metal, it won't squeak. There are also spray-in rubberized undercoatings that you can spray in that will serve the same purpose, and will help with sound deadening.
Anyway, like I said, it's just my opinion, but I think you'll really regret using expanding foam in your roof.
DO NOT spray in foam into the voids in your roof! You will regret it. The reasoning behind this is two-fold. One, the body of the truck will flex, and the foam will begin to separate in places and you WILL end up with *squeeeeeeaks* all throughout your roof that you'll not be able to get rid of....the second issue is that the foam will retain moisture, and will allow it to rust your roof out from the inside.
I actually considered doing the same thing, but upon reading a number of old posts on this subject, and the fact that I've worked with that liquid expanding foam before, it sunk in that that was not what I wanted in the roof of my truck. I'd go with the spray-in bedliner, as it's a protective coating, it doesn't absorb moisture, and as it's bonded to the metal, it won't squeak. There are also spray-in rubberized undercoatings that you can spray in that will serve the same purpose, and will help with sound deadening.
Anyway, like I said, it's just my opinion, but I think you'll really regret using expanding foam in your roof.
Lead Driver
Joined: Mar 2010
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From: West Virginia
expanding foam? what kind.
The kind you buy at lowes won't work. It cures when it contacts air. If you spray it into voids in your boy, it won't ever cure, it will just stay gooey and nasty. Besides, it runs and drips and you would have a hard time spraying it up. Its not dense enough to do anything anyway. And it soaks up water and promotes rust. And its ridiculous expanding rate can buckle steel or wood.
Now, there is 2 part structural foam that you can order from companies that supply race car parts, like pegasus auto racing. Its expensive and you have to mix it in exact amounts, and it has exact expansion properties. It doesn't absorb water, and its self curing (hence the 2 part formula). Its extremely dense and strengthens panels. A downside is that it forms a liquid that has to be poured into the body cavities. To us it in the roof you'd likely have to place the cab on a rotisserie or something.
And on top of that, I can't exactly figure out why you want foam in your roof anyway.
The kind you buy at lowes won't work. It cures when it contacts air. If you spray it into voids in your boy, it won't ever cure, it will just stay gooey and nasty. Besides, it runs and drips and you would have a hard time spraying it up. Its not dense enough to do anything anyway. And it soaks up water and promotes rust. And its ridiculous expanding rate can buckle steel or wood.
Now, there is 2 part structural foam that you can order from companies that supply race car parts, like pegasus auto racing. Its expensive and you have to mix it in exact amounts, and it has exact expansion properties. It doesn't absorb water, and its self curing (hence the 2 part formula). Its extremely dense and strengthens panels. A downside is that it forms a liquid that has to be poured into the body cavities. To us it in the roof you'd likely have to place the cab on a rotisserie or something.
And on top of that, I can't exactly figure out why you want foam in your roof anyway.
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Elder User
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Exactly what I was looking for... your comments. I'll ditch the expanding foam and just spray undercoating in there. I wanted to do this because my cab is so echoey and wanted to strenghten the cab as much as I could. Didn't think about the squeekyness....What about if I spray undercoat in there first then the foam?? I wouldn't think it would squeek then??
Lead Driver
Joined: Mar 2010
Posts: 5,250
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From: West Virginia
if you rotated it in a rotisserie, masked it off, and filled it with structural foam, I guarnatee it would cut resonance in half and wouldn't ever squeak. That **** is STRONG especially when you fill a steel void with it. When you fill unibody race cars with it it DOUBLES their torsional rigidity.
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Elder User
Joined: Jul 2008
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Well I have googled this and what I come up with is called Foamseal. Specifically made for automibles but can't find where to get it. Strong as crap though, well not literlly.
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Lead Driver
Joined: Mar 2010
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From: West Virginia
this stuff will work. 3m also makes some, can't remember what its called, but your local 3m distributor may be able to order it.
Pegasus - 2-Part Foam for Seat Fitting, Two Quart Kit
Pegasus - 2-Part Foam for Seat Fitting, Two Quart Kit
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Fleet Owner
Joined: May 2009
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From: Gilbert, PA
Just use some dynamat or the equivalent. one layer then 2" wide strips on top of that. It makes the truck like a valt closing. Do the door skins, rear of the cab, firewall and floor the same way. It will be quieter than a new lincoln
As stated above. DO NOT USE THE SPRAY FOAM
As stated above. DO NOT USE THE SPRAY FOAM
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