Hot Rods Foil backed insulation

I am using the rolled insulation in my coupe that looks like rag carpet pad with foil on one. Would some body like to discuss the rule for which side is adhered to the car body and which side is exposed to view?

Regards, Twobit

 

Foil to the inside. Seems wrong doesn't it. After doing my F100 with the foil towards the outside and being told repeatly that I did it wrong, I did some research. So I went back and added another layer with foil to inside.

 

I bought the double-sided foil-mat-foil and that way my pea brain didn't have to figure out which went were. It makes a really nice shiny covering and I think now I may never upholster over it.

 

Yeah, glue the foil to the floor. I worked in a shop which specialized in interiors/upholstery and such, mostly restoration. Did it a bunch of times. Better heat protection and probably makes it so your carpet doesnt sound like youre stepping on a bag of chips.

 

Interesting; One vote for inside, one for outside and one for both sides.

Regards, Twobit

 

bttt

 

Does your roll wrapping have a manufacturer name on it? Maybe give em a call. A possible example would be the self adhesive stuff like B-Quiet [what I put in my 40] or Dynamat, the foil has to be on the interior side. I agree that it seems incorrect but I am pretty sure that is the correct way.

 

Foil out carpet over.My last 2 cents

 

Foil to the inside of car!

 

Put the foil in the direction of the heat. I know it looks cool to have chrome floor boards but it is being put there for a reason. Why would you want all that fiber padding all warmed up on a 100+ day? Old Upholster. I must be an upholster I spelled it right!

 

You had 2 for inside and one double sided... right?
Maybe my post wasnt clear, I've never been too eloquent. Sorry for the confusion.

 

its foil to the outside, afaik I did it backwards at first too.

with the rag stuff facing the carpet it quiets the inside of the interior considerably

 

The foil goes on the side where you want to reflect to heat back to, or keep cool. So that probably means foil on the inside of your doors and headliner where you want reflection back into the passenger compartment and on the bottom on your floors assuming you want to keep exhaust heat out. Might want to consider reflective side out on the firewall,too. .

In the long run, given the actual R values of the foil and the fiber, it probably doesn't really matter, the stuff's not super insulating anyway, but better than nothing.

 

I hate to keep posting to this thread, but its confusing the hell out of me. It looks like everyone is saying the same thing, just in different ways. The words inside and outside are relative, and it all depends on what you are relating them to. The inside of the car, as in towards the interior of the car where you sit. Or, you put the foil on the inside, so you dont see it. As in the fuzzy side faces out. But as has been said by mj40 and 5window, the foil reflects the heat and should be applied as such. So on the floor, the foil would be down and the fuzzy side up. This would insulate the interior and reflect heat from the exhaust keeping it out of the passenger compartment.
Agreed?

 

If you "can" compare car insulation to house insulation, here's my 2 cents:

The foil is your vapor barrier and faces the "inside" of your home, hence your car. Home insulation, without a properly installed vapor barrier, severly restricts/reduces its insulation value. You want to keep your home cool in the summer and warm in the winter, same as your car. Also, insulation acts as a sound barrier regardless of having a vapor barrier or not but sound deadening qualities do not equate 1 to 1 with insulation qualities.

 

there is no wrong or right way. the foil side reflects heat. the fabric side absorbs sound. the foil is about an r-10 value ,that is equal to 3 1/2'' of fiber glass insulation. it seams that the two sided insul. would be better for heat but so good for sound. im using bitchothane (a water proof flashing, like dinomat, but cheaper)for sound then i spray glue duct insulation(foil backed bubble wrap) over it for heat. all found at home depot/ lowes.

 

foil to the inside

 

The "foil" side is for heat reflection. The "pad" side is for sound absorption. Best way is to have foil side towards sheetmetal, reflecting heat before it enters, but the difference would be miniscule. Trim shops (or as some people refer to them as "upholstery shops") install the stuff both ways. I had 35 years experience working with flooring...

 

I put the foil to the floor (didn't want to) and just put floor mats down until i get the carpet.

 

I prefer to pull the insulation inside-out, so that the foil is on the outside in the middle. Then I put the foil so it faces inside, towards the bottom of exterior heat source. Works every time.