The Stovebolt Site Forums The Parking Lot Panels 'N Burbs Roof insulation

I have been searching for info on roof insulation for my burb. Most of what people are calling insulation is sound deadening material. Does sound deadening insulate? I'm concerned about hot sunlight.

About all I can find referencing burb roofs is Tim's link to pictures. But I can only open that site on blue moons. Tim, how about the name of the product and does it insulate?

Anyone else used something you're happy with for heat insulation?

Reflectix works, especially the double layered type if any builders supply near you stocks it - sticks on well with spray contact cement - nearly used a whole 50' roll of 4' wide on daBus conversion and will use it in my 57 panel project

Bill

Charlie,

The insulation I used came from The Pep Boys. It has a plastic foil-type material on both sides of the air cells. I attached it with 3M super spray-on adhesive (joining pieces of the material under the roof braces).

Sorry about my site having bad connections. I sometimes have the same problem and cannot figure it out.

http://www.1954advance-design.com/Photos/Reassembly/slides/14_ceilinsul1.html

There must be a blue moon tonight. The link opened. Thanks Tim. That looks good. It appears to be the same or similar to what Bill named. by the way, thanks Bill, too.

On the Reflectix faq page it states that if there is no air space there is no reflective benefit and the material has an R1.1 rating. Is this enough to feel the benefits?

Tim, would you expound on the part you said about (joining pieces of the material under the roof braces).

Am I missing something? It appears it'd be better to put it over the braces between them and the top. Then my panel is probably different?

Cletis, you bring up a good point about the air space & R-value.

Alvin,

Thanks for the correction. I should have posted "above the roof braces" or "between the roof braces and the roof".

Cletis - I'd say the air space is between the sheets of foil, the bubble insulation, and that's why the double bubble type with 3 layers of foil is best ... I have it on the ceiling of daBus and just recently while working on adding the rock wool insulation up there I was quite pleased to notice the large difference in temp between the inside Reflectix surface and the metal roof as I pulled edges tight, must have been 10 degrees or more

if there's a place around you can buy a foot or 3, try it on your roof or just on a piece of metal in the sun

here's a pic of what I did

Bill

I didn't realize there was double bubble stuff. Back to the website for more studying.

It show the double layer stuff needs air space to be effective.

http://www.reflectixinc.com/images/uploads/allpdfs/mb%20air%20space%20rqmnts%200708.pdf

I don't make any claims of R-value and have no liability under law .... it works for me and is worth a try

Bill

I buy that double bubble stuff in large quantities, up to 4000 sq. ft. at a time, to put under concrete floors that have in floor heat. I never thought to do the panel with it, but it would work well. I have 'Agri-plus' fiberglass insulation in my work van, it's 1.5" thick and has a white vinyl facing on one side. Sorry, I can't supply a link, but it has an R value of 5.

OOOK guys. Stupid question that I think I already know the answer to but here goes.
Why not the stuff used in walls of a house. There is room to compress it in the roof and side area's. Its R-value is much higher and you can get different R-values.

**Is this the answer? It will Sweat and moisture causes rust?

I personally have never done that but over the past years I have seen some hot rods with it in them. Maybe that was before Dynamat or Reflextix

compressing house insulation [Fiberglas etc] causes loss of the R value, and higher R value = thicker - also, yes, Fiberglas insulation absorbs water and causes rot, I had to deal with some of that in a few spots on daBus where a PO had totally packed spaces, like the back door, which was about double it's empty weight because of all the water

Bill

...you confirm my suspicions.

I received the following response from Reflectix customer service.

"We have a lot of people who use it in remodeling classic vehicles. This is not a problem at all and it will still work without the air space just not to its full benefit.


Thank you,

Angelic Millspaugh
Reflectix, Inc.
Customer Service Rep."

Well, I went into a couple stores and do not see Reflectix by that name.....does anyone "in the south" know what store carries it.....or by some other name?

I found the single bubble at Home Depot.

Which spray adhesive is the best one to use with the Reflectix
as to not fail when it gets hot in the summer months?

I've had good luck with the 3M "77" spray

Bill

Warner, times 2 on the 3M 77 spray. That is some "sticky" stuff Works great. Just don't get in a hurry. Do it once and do it right!!

Thanks Alvin and Squeeze.
I thought it was the 3M 77 but wanted to be sure as I don't want it falling.
Also, did you spray the whole surface or just in spots??

for overhead it's best to get fairly complete coverage so you don't get saggy areas, walls I've just done a good strip along the top and a few other spots

Bill

I have found that 3M Super Trim Adhesive is even better than 3M 77. It is sold at auto body/paint stores. It's what I used for putting the Reflectix on my Burb roof last year.

I used what Anton used. I followed the installation instructions.

I guess I should have. I installed the reflectix last night with the 77. On the way to a car show today some of it pulled loose.

get some foil sided foam insulation. bubble won't handle the heat!

Guys, I did my truck close to ten years ago with the bubble foil on both sides material. It is still in place. I did the inside top of the cab, the back of the cab, the inside of the doors, floor of the cab (where the gas tank is) and the firewall. I used 3M Super Trim Adhesive (Yellow) #08090.
I would have to pull hard to get any of it off of the surface it's glued to. I put three layers in the cab top and doors. It is almost unbelievable how it has cut the sounds and has done well with the heat also.
The other material I am using on the firewall in addition to the bubble foil material, is the material found in a welding blanket. The fire wall heat in my truck is plentiful. Gotta stop that!

Anything is better than the black tar paper I found glued to the inside of the roof on my 1946 Suburban. It was factory supplied.

I bought a 4ft by 50 ft roll of foil backed bubble wrap for $60.00 at the Charlotte auto fair.

So far I have lined the following vehicles with it:

1941 1 Ton Pick up.
1946 Chevy Suburban
1963 Ford Falcon Ranchero.
1978 Grand Banks Trawler windows to keep the sun out when at the dock all 19 windows.

This stuff is easy to double up if you want more insulation and don't forget, lighter color vehicles do not have as much heat gain as dark ones.

Anton,
Did you use the Single or Double sided Reflective Insulation?
Harold

I used the double sided Reflectix. So far so good!

OK, the 3M #77 is no good for this purpose. Is the 3M Super Trim Adhesive different from the 3M Weatherstrip yellow stuff?

3M Super Trim Adhesive is often called "yellow death" or "black death". They are excellent adhesives but can be a messy challenge to use over large areas.

Nonetheless, I found the 3M Super-77 Multi-Trim Adhesive to work quite well on the roof of my Suburban (a clean, painted interior roof). It also applies much more easily and cleanly than the Super Trim Adhesives (I have used them both).

One may be more suitable than the other (in application) but neither is no good for the purpose.

If it won't adhere the Reflectix to the roof it is no good for my purposes. I'm going to use something else tomorrow before I head to KC. I'm tired of this stuff falling down while I'm driving.

Elmers spray adhesive worked fine for me, have to put a good coat on the Reflectix as well as the ceiling like contact cement

Bill

4' X 8' foam bord insulation with the foil on it. Home depot. Not the white styrofoam though! It's foil on one side and blue plastic on the other. Shiny side up!

OK, so maybe it is not quite the answer needed, but here is my 2cents:
On my dark green Suburban, painting the roof (yes, outside!) white made a significant difference in the summertime, it does not get hot inside anymore, now, I can even touch the ceiling without burning myself!
How good can insulation be if the roof itself acts as a radiant heater?...

I found the 3M trim adhesive today. Man, they are proud of that stuff. $21 a can. For that price it ought to do everything but talk Mexican. I'm heading north tomorrow. I'll let you know if it works.

Personally, I think that's cheap, especially if you're restoring a Burb :-)

Found this maybe it will be helpful to someone.

The last couple projects have had the inside coated with a product called "peel and seal". Specs are the same as other vendors with a price that blows away the competition.

I ordered a roll from Lowes, 36" x 33 1/2' *yes, a roll over 33 ft. long* for around $110 shipped to my door.

Mathematically it's less than 1/2 the price of Dynamat

Hope this helps a few people!
chris<pixelmonkey>:D