I've been reading a lot of info from Europe on rock wool. It is claimed to be close in R-value to foam and much greener with open vapor. I am interested in using for exterior and basement insulation. Does anyone have experience using rigid rock wool? Thanks.

Views: 379

Reply to This

Replies to This Discussion

Hi Richard,
I'm not sure about your reference to "Ridgid" rock wool. I'm somewhat familiar with Roxul which is a high density cavity insulation and I like it. As for basements, there are SO MANY other considerations, but yes, for a layer inside of some rigid foam panels it looks good.

Bud

Rock wool is available in rigid product, with various densities, depending on application.

There is a product designed as drain board for foundations.

It's available in pipe insulation, batts, and blown in. Although you may have a hard time finding or getting.

Look for industrial / commercial / wholesale insulation suppliers.

It's fireproof & waterproof, lower embodied energy than foam, but has formaldahyde glues still.

I have used a few brands of rigid batts for air sealing and found the Roxul brand better. Roxul is more dense and easier to cut  and we use it frequently for air sealing in areas where foam will not work and some chase areas. Most brands are marketed as acoustical batting,  however I have seen Roxul reps at the big box stores promoting the product for general attic/wall insulation against fiberglass. For attics cellulose is more cost effective and any rigid  batt (rock wool or fiberglass) used in attic insulation  is problematic. Rock wool has great thermal characteristics and does not wick water making it a good choice for basements and exterior applications. My only complaint is rock wool (slag) fibers are nasty.

Thanks Jose

For exterior application do you attach directly or with drainage plane?

I have not used Roxul for exterior applications- only airsealing and basements. Check their website as I believe Roxul offers additional products specifically for exterior applications

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Eric Kjelshus commented on Jeremy Begley's blog post The Home Envelope : Does it Really Matter in a Heat Loss Caculation
"IT all matters,  I lot of sealing,  A lot of air barrier.  A lot of "R" A…"
1 hour ago
Michael Dunseith posted a status
"BPI Infiltration and Duct leakage (IDL) Certified"
6 hours ago
Jeremy Begley posted a blog post
9 hours ago
Kim Burnett joined Sean Lintow Sr's group
Thumbnail

Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what…See More
10 hours ago
Kent Mitchell commented on Adam Swain's blog post Top Worst Crawl Space Insulation Ideas
"Hi Adam - It sounds like you may be referring to enclosed crawlspaces - Here in the NW we've…"
12 hours ago
peter chang replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"I think it is quite possible the greatest savings will be realized by the lowest volume users. I…"
12 hours ago
Marie Fuentes is now a member of Home Energy Pros
12 hours ago
peter chang replied to peter chang's discussion Programmable tstat for electric baseboard?
"Good plan, thanks. That looks pretty much like how I used to program mine (when I had one). Maybe…"
13 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service