I have a haulmark 24' enclosed trailer with that really thin aluminum roof that gets to about 120 degrees in the summer. the walls are already insulated, but now i need something for the roof. That trailer becomes an oven in the summer and the one A/C unit is no match. Any ideas?

Foamboard, also called blueboard, also pinkboard. Get it at any home store in 1/2" thicknesses and most home stores in 3/4" thicknesses. Thicker sizes available at commercial building supply places. You can cut it to fit tightly between your roof ribs and you will not loose much headroom. 1/2" = R-3 Even R-3 makes a huge difference.

Foamboard, also called blueboard, also pinkboard. Get it at any home store in 1/2" thicknesses and most home stores in 3/4" thicknesses. Thicker sizes available at commercial building supply places. You can cut it to fit tightly between your roof ribs and you will not loose much headroom. 1/2" = R-3 Even R-3 makes a huge difference.

How much will this bend to meet the bow of the roof? And what would be the best way to attach it?

Thanks for the feedback

Check out this sled trailer http://www.youtube.com/user/MountainModMania#p/u There are a series of videos on the mods done and IIRC one was spray foam insulation.

How much will this bend to meet the bow of the roof? And what would be the best way to attach it?

Thanks for the feedback

The local lumber store sells it up to 1.5" thick. They'll bend enough to bow with the roof. You just gotta cut them so they fit up between the roof studs and then line the roof with wood or beadboard of some sort. Wouldn't look too good if you didn't cover up the pink foamboard

Get some low-E foil insulation. It's about a 1/4" thick and gives around a R-11. We use this for roof in the pole barns we build.

I am planning on doing the same thing for my box trailer. I found some styrofoam at home depot that is like 1.5" thick and like 2'x4'. My trailer is framed with 1.5" tubing, so this will fit perfectly. My walls are already covered in 1/8 plywood, so I will need to pull it off to add the insulation. The roof is not lined at all, but it will be after I add the insulation. It should make a huge difference when its done. I think it will also give some rigidity to those flimsy walls too.

I'd put in a vote for spray foam, www.tigerfoam.com

I'd put in a vote for spray foam, www.tigerfoam.com (http://www.tigerfoam.com)


That stuff looks cool. I can only imagine the mess you could make trying to figure out how to spray it. I always make a mess with the stuff in the can, this would be way more fun.

That stuff looks cool. I can only imagine the mess you could make trying to figure out how to spray it. I always make a mess with the stuff in the can, this would be way more fun.


Actually it makes a lot less mess then the stuff you buy in the can. It comes out more like spray paint and then expands after it hits the surface.

thats cool. I always misjudge how much it is going to expand. By the time I get it figured out, I'm done. Then I forget and have to learn all over again.

They make foamboard with aluminum foil backing which will really help with the radiant heat. Once you seal the seems with aluminum duct tape it makes for a really nice finished look.

Another option would be to use the aluminum foil covered bubble wrap that they sell at lowes. It has a very low R value, but the aluminum foil does wonders for radiant heat.

X2 get something with a foil to reflect the heat.

I did this awhile back to my 30' Haulmark. The roof has wut they call 1" top hats in it. If you pull the roof down you will see that only 3/4" foam board will fit. I cut mine with a small hand held molding saw. Took longer to get the trailer apart cus they staple and glue every dang thing together. It was well worth the labor involved. Hope this helps ....good luck with your project!

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This is great guys thank you very much. Im going to use the pink foam and line the roof with luan. And then the florescent lights go on :) Cole99, that is very nice. What kind of difference did you see?

Cole99, that is very nice. What kind of difference did you see?


Man there is a big differance!!!!! Your not cooking your butt off while in the trailer. That and the trailer doesnt sound like a big tin can when your inside. I will say this when putting the roof back together take care so not to over tighten the sheetmetal screws. The tophats are thin and strip easy. Good luck post some pics when your done!

Will do. Thank you!