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Old 06-24-2011, 07:30 PM   #1
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Prodex sizing?

As prodex is on a buy one roll get one free sale (Insulation for Less : Prodex : Reflective Insulation : Pole Barn Insulation : Metal Building Insulation : Bubble Insulation ) I thought I'd purchase it now and save some money ....... even though I'm nowhere near needing it!!!

Can those of you that have used it guesstimate how much I need? And whether the 24 inch or the 48 inch is more efficient in terms of fitting it between the ribs? I'm 4 hours away from my trailer and can't measure it.

I have a Overlander 26ft and am planning on using two layers in the walls.

Thanks!!!!
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Old 06-24-2011, 08:23 PM   #2
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26 feet of wall plus 8 feet of end cap, for a length of 34 feet, doubled as it has two sides, is 68 feet. From the floor to the middle of the roof is 10 feet, doubled is 20 feet.

Thus 68 * 20 = 1360 sq feet.

You want two layers so you will need 2720 sq feet.

That is 680 feet of 48" or 1360 feet of 24" widths, by my rough reckoning, ignoring openings and the floor.
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Old 06-24-2011, 09:14 PM   #3
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2 layers in my 22 foot Caravanner used just about all of 1 48" roll.

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Old 06-24-2011, 09:29 PM   #4
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Thanks Dave and Steve!

The roll is 700 square feet so I'll be cutting it close with one roll (no pun intended!). Any comments about how much waste was involved? They do offer a discount on one roll if I don't go the buy one get one free route....
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Old 06-25-2011, 01:06 AM   #5
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Ah, I was assuming the rolls were 125 feet long x 48" wide like the rolls I bought some time ago...
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Old 06-25-2011, 04:00 AM   #6
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I do not know if Reflectics is the same as Podex in sizing, but it took 7 48" rolls of it, to do two layers in a 30 foot Sovereign. I bought it off the shelf at Lowes (the vintage RV part superstore) but never took notice of how long the roll was. You will need many cans of spray adhesive too.
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Old 06-25-2011, 04:21 AM   #7
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The rolls of Reflectix at Lowes are 25' long. The Podex is 175' long. One roll should do you.
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Old 06-25-2011, 08:00 AM   #8
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I picked up a roll of Reflectix yesterday, and not knowing how to stick it down, also picked up a roll of metal HVAC tape. I assumed that the heat would melt the adhesive between the panels. So if the proper installation (of the insulation ha) is two layers, do you put a layer of "pink" insulation in between, or is this overkill?
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Old 06-25-2011, 09:29 AM   #9
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We camped in our aluminum tent when it had one layer,90degrees out and no shade and it was very comfortable in side. So now with two layers and the liner back in I am confident it will be enough. I didn't want to have anything in the walls or underneath that would hold or absorb water.
I used about 14-24"x25'rolls for 2 layers on our 26'cruiser
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Old 06-25-2011, 08:23 PM   #10
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Quote:
Originally Posted by NoMoSOBs View Post
I picked up a roll of Reflectix yesterday, and not knowing how to stick it down, also picked up a roll of metal HVAC tape. I assumed that the heat would melt the adhesive between the panels. So if the proper installation (of the insulation ha) is two layers, do you put a layer of "pink" insulation in between, or is this overkill?

Actually its not overkill but may not be a great idea. Assuming you are taping (sealing) the Prodex, by putting pink insulation in between you are creating a "moisture sandwich" . Any moisture that ends up in the insulation will be unable to evaporate. Even if you don't have leaks you will get water from condensation. I'm skipping the pink altogether. Do a search on the forum. Some of the other members like Boatdoc and DaveParks have some very good points/ideas.
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Old 06-25-2011, 08:27 PM   #11
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Thanks again to you all for the responses. I've sent a request to the company to get a coupon for one roll (this is their way of handling those that don't need a second roll) and hopefully I won't make mistakes! I'll report back with the actual discounted price.
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Old 06-25-2011, 10:43 PM   #12
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If there is a discount its a small one - the $299 per roll price with the $100 coupon puts it about where I paid for a single roll delivered not too long ago, the 2-for-1 at $150 a roll delivered is a good discount though (18%?)
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Old 06-25-2011, 10:54 PM   #13
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I have a 22' flying cloud. I used about a roll and a half. I made spacing strips out of it which ate quite a bit up. I would use rigid foam next time like I did 3/4 the way thru.

I would get the two roll deal. You can utilize the rest in your home, say on your garage door, exposed ceilings in garage perhaps, who knows. Its useful stuff.

Also, I should note, i made a nice "space suit for my 2 year old. Pants, jacket, helmet, etc.
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Old 06-26-2011, 08:01 AM   #14
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I also used about 1.5 rolls of 4 foot wide in my 24' Tradewind. Two layers and making my spacing strips from the Prodex. One note: I bought one roll and later the second roll. The second roll's actual insulating width was more like 46" wide due to nailing tab material.
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