Roxul insulation

[working on it]

biziedizie - I'm not answering your question, because I'm not insulating my trailer, but I have a related question for you. You stated that you use Roxul in construction, and I've seen it used on "Holmes on Homes" on DIY, but never saw it in stores (listed on Lowes online though). Is it as good as the reviews say (noise reduction, water-resistant, easier to install than fiberglass, etc.)? Is it worth paying a little more, and waiting for it to be shipped? I really hate using fiberglass (always gets on my eyes or worse -gag!- mouth, and I itch for hours). Since I've been forced to stop my trailer build to re-construct a room/ceiling with collapsed rafters (my wife says it's more important than my trailer build-ha, go figure!), I would like to try Roxul, rather than use fiberglass. I wanted to try foam board, but she and I both think Roxul a better alternative.Also: Since the room being fixed has non-standard centers (due to my repairs) ease of cutting the battens to fit is a priority. What's your opinion?

[AceMan]

Do to the thickness of most teardrop walls and ceiling I would not think it warrants the extra cost. From reading many comments on this site it seems that insulation should be a small concern in a Tear. I have foam board only in the ceiling. A TT may be a different story IMO

[bobhenry]

I went to their web site and have added the r value performance as per their specs at the bottom of this list. My next question is why bother when it barely out performs bead board.

R-Value Table
Material R/Inch R/Thickness
Insulation Materials
Fiberglass Batt 3.14
Fiberglass Blown (attic) 2.20
Fiberglass Blown (wall) 3.20
Rock Wool Batt 3.14
Rock Wool Blown (attic) 3.10
Rock Wool Blown (wall) 3.03
Cellulose Blown (attic) 3.13
Cellulose Blown (wall) 3.70
Vermiculite 2.13
Air-entrained Concrete 3.90
Urea terpolymer foam 4.48
Rigid Fiberglass (> 4lb/ft3) 4.00
Expanded Polystyrene (beadboard) 4.00
Extruded Polystyrene 5.00
Polyurethane (foamed-in-place) 6.25
Polyisocyanurate (foil-faced) 7.20

Roxul 3.6 to 4.3 ranges depending on ambient temp

[meledward]

I have only just started using Roxul.
I did a fair amount of research on it before using it. I came to knowing it when I was looking at building a walk in refrigerator (basically a southern root cellar) for my garden.

It has significant advantages over fiberglass. 1) its not fiberglass!

2) Working with it is a dream. I used it to insulate my pantry that I built (62 degree thermo controlled pantry) and I stuffed it between the sloped ceiling joists. Just stick it in there and it holds in place, no need to secure it. I had a 20" OC opening in that slant ceiling (completely no structural as it is merely dressing up an existing angle I didnt like). For that opening I turned the insulation sideways cut it and once again it just sits in the opening. Fibereglass would have been hell to work with.

3) if it gets wet, it doesnt collapse like fiberglass insulation and it still retains its R-factor

4) this stuff is dense, which allows #2 and #3. Its like working with a pocket lint. I mean you know that pocket lint that is really dense, but will crumble if you break it up. This is like a tightly packed loose foam. if you use a good knife you can easily cut it to size. If you man-handle it you can smash it and crumble it some, but it still more or less retains shape and form. Very easy to work with for non-stnadard locations. Its a beatuy for that 6" OC stud etc.

5) its a sound deadner.

Now, is it better than the "pink" and "blue" foam?
Foam advantages - it is a vapor barrier. If you install the foam, and caulk and or foam seal all the tiniest of gaps (and even better overlap the foam instead of using one 4" thick, using two 2" thick in opposite running directions you can get an air tight seal. Well, In campers you probably want to "breathe" some, same as a house. To tight and you create new issues. For my Cooler/Fridge this is a big benefit.

And as shown above, foam has better values R per inch.

Well, that is everything I know, hope it helps.

[AceMan]

Well, If it's FREE. That's the best price!!