Cargo Trailer Conversion Floor Insulation 

The love between a man and his duct tape is priceless. Love your videos

several ppl have mentioned coating the floor before install the foam board. I'm thinking about doing this and using KILZ Mold & Mildew primer film paint, let it dry, then putting the foam board. What's everyone's thoughts on using KILZ?

I would rhino seal or other marine seal before I would insulate the underside because of moisture between the foam and plywood.

I just pulled the trigger on a 7 x 12. I have been enjoying your videos about this project. I've never attempted something like this before and watching your videos has given me some inspiration.

Seal particle board before placing insulation,use correct glue, and seal all edges for water with flex ssal. But at least have an idea what it looks like under there its possible.

How did the insulation hold up over the winter? In just starting a 7x16 conversion and am getting a ton of good ideas from your videos. Thanks a bunch.

I've been thinking about doing this. Although I have a lot of bolts coming through the floor for E-Track, Wheel Chocks, etc. Just another challenge to overcome.

Great job. I will be using some of your ideas on my cargo conversion. An idea or two I might suggest. Undercoating before adding the floor insulation. And I was nervous watching you under the trailer with no wheel chocks that I could see. Stay safe and looks good though.

How would moisture escape should it get on top of the foam board?

If I use foam board with film on one side and put the film side down will I have to use foam board glue so as not to eat into the foam ( I know they make glue just for foam board and not the liquid nails? thanks

Here I am again! I don’t know why but my Yutub searches always lead me back to DirtyShopDIY! Maybe it's because (unfortunately) my work areas have lately been left in quite the clutter too? Anyway, I’ve got another question for you if you don’t mind...(If we can set it up, I can pay you for an hour’s worth of phone support and for all of your help with this trailer project. Let me know). My question(s): 1. What should I ask for (at Lowes/Home Depot) to match your “waterproof" type of floor/wall panels? I’ll probably get the same if it’s light weight and thin. I saw that you wanted 1/8” of …? But ended up with 1/4” of …..? And, u were saying something about using some kind of material that shower stalls may be made of? I think that would be ideal if….(whatever that is called)….….is light weight and not too expensive! Otherwise, is it just some type of thin plywood? Thanks and please let me know and I’ll pay u for advisory fees! Art

The mice and rats will have a heyday with that insulation unless you use hardware cloth to prevent them from chewing their way into it.

At this point I see this was posted about 1 1/2 years ago, how well has the insulation held up and was it worth it to do the project? Asking because I am considering doing the same.

Putting any holes in the tubular steel is a bad mistake! As the years go by it will start rusting on the inside of the tube and eventually compromise the structural integrity. I’m hoping you didn’t use tubular steel on your trailer and then put holes in it.🤦‍♂️

Do you put anything below the insulation to protect it from the elements, or do you just leave it exposed? Thank you.

How has ur undercarriage insulation been sticking all this time? Any fall off while trekking around?

Dumb question....what is better...underneath or over the floor insulation and why one or the other?

Thanks for the instructions!

Don't you have to water proof/weather proof the underside? It looks like raw plywood

Thanks for the vid, good info

did it make much difference in the warmth of your trailer

Hi Dirty Shop..i have my first 7x12 cargo trailer with ramp...please help me figure our a tent style add on for ramp door. I'm adding window an insulate the walls an roof. I'm personally doing fold down bed ,cause we haul 2 atv. But son want a tent style room on top of the ramp. So I'll add chains to keep door level or add stands. But a tent style room attached to opening of cargo rear opening..please help.

Great job on your video. Wondering what you think of reflective on the inside of cargo trailer on floor and then those 2' square foam mats that you lock together. Would you think it ok or would I have a problem with mold. I would appreciate your thoughts.

You will get water and moisture between the insulation and bottom of floor of trailer and then mold and rot. Didn’t you insulate the floor from the inside?

Lol, you're nuts, I like it 😎

👍🏻😎 Thanks

I’m going to insulate the floor from the inside because as you drive in the rain , water will get into every space it can under the trailer and the insulation will hold that water next to the frame and make it rust.

I would use metal / foil tape

This guy is a Genius! Thxs for sharing!

I've always been mystified as to why the vast majority of people whom convert cargo trailers into campers don't actually insulate the floor (or door). It makes no sense not to insulate the floor of any camping vehicle, and done from the outside, it provides additional protection to the bare plywood underside.