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Old 01-26-2012, 03:52 PM   #71
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Originally Posted by tlynn87 View Post
So after doing lots of reading and researching I have decided to use Prodex too. My question is for malconium. What is the result of all your hard work? Have you had her in the summer heat or the freezing wither weather yet? I plan on full timing in my AS and live in extreme climates!! Also when you install 2 layers of Prodex is there any extra room on the inside? Would I be better installing 3 layers or will that ruin the benefit of the air gap??


Thanks for any replys!
My Airstream is still a bit of a work in progress but I do feel happy that I added foil insulation instead of the original fiberglass insulation. I have only take the trailer out 2 times so far in weather that has been moderate. I was using a small electric heater at night with night time temperatures down to maybe the high 40's. Much of my recent work has been on my radiant heating system. See the following thread on that topic.

http://www.airforums.com/forums/f163...ion-78761.html

My personal opinion is that two layers would be the way to go for your need. From what I can tell it is a good idea to have at least 1/2" of air gap at the surface of each foil layer. The walls are about 1-1/2" thick which means that using two layers would give you right at about 1/2" of air gap between each layer. You can use 1/2" thick foam to make supporting strips around the edges of each cavity. I also think it is a good idea to add some sort of thermal break between the ribs and the inner skins. I used felt but I do not honestly know if that is better than other alternatives. It was what I could find at the time and installed easily enough.

One type of reflective foil insulation that might be worth looking into - especially from a price point - is the following:

Aluminum Radiant Barrier Insulation | Ra-flect Radiant Barrier

This type has a woven mesh material between the layers which makes it very strong. I am not sure how this behaves instead of a layer of bubble or foam but I think that with two layers of foil the air gap between the two layers is a lot better than any thin foam layer with just one layer. In our application the strength may not be that important either. The price point looks very good compared to what I paid for Reflectix foil. I have purchased some of this product for insulation in a back porch and I used some of it on my Airstream floor too. I wish I had found it sooner.

Malcolm
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Old 01-30-2012, 01:58 PM   #72
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I've been trying to keep up with everyone's insulation types and techniques and have come across some insulation on CL for a good price. Does anyone know about the NASA type foil backed over a thick membrane stuff? Its about 1/2 thick and used in house attacks. I don't think its the same stuff as the Prodex. Sorry if this has been asked before. I tried to find it first before I posted.
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Old 01-31-2012, 05:21 AM   #73
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Thanks for the reply Malcolm!! I still have plenty of work to do before I insulate. I think i am going to use two layers of Prodex though. Good luck with your project

Tlynn87


Tahoe_air

Sorry never have heard of anyone using the stuff before, But sounds good being that it's 1/2 in thick. Good luck
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Old 01-31-2012, 06:39 AM   #74
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I finished a second layer of Prodex in my 23' Safari this winter and am very happy with it so far (just putting the inner skins on now). I did .5x1 in foam furring strips glued with liquid nails to the exterior walls for the first layer, then just compression fit the second which went much faster. I didn't do the holes in the floor like Malconium, but I think it would be a good idea in principle. I was almost able to do both layers with one roll of the 48" Prodex (700 sq ft). I was more thrifty with the second layer by foil taping med size pieces for larger areas. I also used some for covering vents and windows to try and stay warm last winter. The other day is was around 30 outside and I had to turn down my little heater, it was very cozy. I actually hate covering up the insulation, I like the way it looks. Even though it is more time consuming, I'm very glad I did this over the pink.
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Old 02-01-2012, 07:21 PM   #75
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Silversky would you please explain what your mean when you say compression fit the second layer??

Thanks
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Old 02-01-2012, 08:11 PM   #76
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Happy to explain, esp since I probably misused the term. With the first layer, I cut and glued the Prodex to the furring strips. Then I ran all my electrical wires. The second layer I just cut the Prodex to the shape of the opening and did not use any glue to hold it in. The material keeps it's shape, so it stays in place well. Installing the interior skins will also keep it in place. I have a guaranteed .5 inch air space between the ext wall and the first layer due to the foam spacers, the other layers air space is variable, but I'm not worried about that, just glad to have the second layer. Good luck! HTH, elly
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Old 02-02-2012, 05:14 AM   #77
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Easy subfloor insulation

I started insulating the underside of my caravel just yesterday. I used strips of 1/2" foam board to surround each cavity and glued them temporarily with some construction adhesive I had left over from putting in the new floor. Just a few dabs on each piece works well. You can actually surround two cavities at once, slipping the strips between the cross brace and subfloor where the subfloor joints are lapped with the second piece of plywood. The 1/2" foam slides in easilly. Then I cut 3/4 in foam about a quarter inch oversize for each cavity. I held the piece up to the floor bolts protruding through the cross brace and made a slice with a razor knife at each bolt, just enough for the foam to slide around each bolt. Then I used a scrap of 2X4 and a hammer to coax the rest of the panel in place. It makes a nice tight fit. I used 1 5/8 drywall screws and roofers tin caps through both pieces of foam and up into the subfloor to make sure that everything stays put. My subfloor bolts are long enough that I can put washers made from tin caps on them and a nut to further ensure that this stuff stays in place. Today I'll tackle the tricky outter curved sections.
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Old 02-02-2012, 07:31 AM   #78
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pictures....pictures....pictures.

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Old 02-07-2012, 01:38 PM   #79
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Ok thanks for the explanation silversky!! I am going to start insulating soon!! I'm sure I'll have a couple more questions after I start. Thanks for your help
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Old 02-16-2012, 02:24 PM   #80
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malcolm and silversky i have a question. I have just removed all of the old pink stuff and there is a glue with some old pink stuff residue on the aluminum. i was wanting to know if you removed this before you installed prodex or if you just left it on. If you did remove what is the best method of doing so? thanks for your help!!




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Old 02-27-2012, 09:27 PM   #81
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I did remove the residue...

Sorry for the late reply. I have not been keeping up with the forum in a timely fashion lately. I did remove the residue and I did it by using a stiff brush. Mine was actually a wallpaper paste brush but I think other kinds would work as well. Probably even a broom would work. I used my shop vacuum cleaner to pick up the loose pieces.

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Old 02-27-2012, 09:47 PM   #82
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I used a plastic scraper (Pampered Chef's pan scraper) and Mineral Spirits with a rag. I couldn't get it all off, but it was definitely an improvement. I wish I had power washed the inner skins when it was completely empty instead of scraping/washing them by hand. Sorry if this is too late to be helpful.
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Old 02-29-2012, 02:29 AM   #83
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Ok thanks. Its not too late!! I have found my self doing a lot more to this camper than originally planed. I got to get a good look at the frame so now I have to remove all the old subfloor and paint the frame with some por 15. And while I have it all out I'm going to pressure wash the inside walls!! But thanks for the replys! I was thinking today that I am going to be in extreme cold and heat and thought about putting two layers of Prodex together for the first layer next to the outer skin and then one more a 1/2 in away with the spacers. So altogether I would have 3 layers of Prodex but two of them will be sandwiched together to add thickness. I thought about doing this because the Prodex is so thin. Do you think this is a good idea or just a wast of money??
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Old 02-29-2012, 06:55 AM   #84
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I'll leave the answer about the layers to Malconium or others better versed in the insulation performance arena, but please let me/us know what you decide or end up doing. Side note: I didn't start out planning to gut my stream and have a complete shell-off frame restoration (floor and frame thanks to Frank's Trailer Works) either, but now that I did, I feel like this trailer can get handed down to my future grandchildren. Good luck!
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