I did an audit last week of a home built in 1992.  The attic insulation looks like a coarse, dark, insulation cellulose.  I haven't run across this type yet and am not sure of the exact name or R-value.  Any help would be appreciated.  See photo.

Views: 1415

Reply to This

Replies to This Discussion

Hey, Rob

 

Based on the photograph that almost looks more like Rockwool than cellulose -- does it have a more irritating fiberglass feel to it?  If so, I'd definitely say rock wool.

 

Hope that helps,

Anthony

Anthony,

Thanks for the reply.  It really doesn't have an irritating feel.  Rockwool is pretty consistant in color and texture.  This looks like a recycled material.  Little varied in color and texture.  Also looks like little pieces of cardboard in it.

Rob,

 

This appears to be a cellulose type insulation. Recently we have seen more manufactures use recycled cardboard in their manufacturing process because it is less costly, and abundant for them to purchase. It could very well be one of the first cuts at using the cardboard in lieu of newsprint to produce the cellulose insulation.

 

I hope this is helpful.

LOL,

 

Call the DEA!

If you don't see newsprint (letters) and you don't smell iron, it coudl be a blown fiberglass that was made by chopping up batts. 

Rockwool will usually give you an iron taste in your throat even through a mask. 

I haven't heard of the cardboard cellulose stuff before. 

Some cellulose uses ammonia sulfate as a fire retardant and if you get it wet it off gasses ammonia.  Try dampening a little and see what you smell.  Some cellulose uses Boric Acid as fire retardant, and that will not off gas ammonia, so this test is not difnitive, but it is easy & cheap. 

There are cotton batts and cotton blown insulation products in the market, but they are usually denim products, and blue in color.  maybe someone is cutting up Carharts? 

Try setting some on a fire proof surface (dirt) and hitting it with a plumbers torch,  if it melts quick, it is likely fiberglass.  if it just laughs at you it is probably rock wool. if it chars it is probably cellulose.  I am not sure what a cotton batt will do in fire. 

Pat:  I wasn't aware rock wool was a good flame retardent.  Why is that?  Thanks.

i wouldn't call it a flame 'retardant' it is basically spun out iron slag, so it has a melt temp up around 4500 degrees F, and it will not burn.  it also has a very high density, so it is frequently used in commercial work in partitions for sound attenuation. 

 

thermafiber is a trade name, there may be others.  bear hair is a vernacular name.    

 

I have seen cellulose go from grey to brown in color with prolonged exposure to light.  i think this is the same as newspaper that browns over time with exposure to light.   

RSS

Featured Forum Discussions

BPI Anaylist and installers

Started by Larry R Waters in BPI. Last reply by Quinn Korzeniecki 22 hours ago. 1 Reply

What causes a temperature plane in a home

Started by Energy Wise Solutions in HVAC. Last reply by Brad Cook yesterday. 6 Replies

Velocity Pressure Testing

Started by Horace Douglas Hunt, Jr. in General Forum. Last reply by Horace Douglas Hunt, Jr. Apr 15. 2 Replies

Videos

  • Add Videos
  • View All

Latest Activity

Chris Woods added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Minneapolis Blower Door Fan and Door frame $990 OBO

I have a used Minneapolis blower door fan (fan only, no controls or panel) and the blower door…See More
12 hours ago
Profile IconManuela L Heyn and Paul Nagel joined Home Energy Pros
15 hours ago
Bill Spohn replied to Eric Sperline's discussion Wanted: Energy Auditing Equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"If you choose to buy new, give TruTech at call at 1-888-224-3437 option 1"
17 hours ago
Home Energy Magazine's blog post was featured

The Legends of Home Performance

A project long in the making, we're happy to finally reveal some of our Legends of Home Performance…See More
18 hours ago
Quinn Korzeniecki replied to Larry R Waters's discussion BPI Anaylist
"Hi Larry, We're glad you're reaching out to hire some BPI folks! You can also submit…"
22 hours ago
Larry R Waters posted a discussion

BPI Anaylist

Industry leader in the north bay area California. Looking for experienced professionals and future…See More
yesterday
Larry R Waters joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
yesterday
John Nicholas replied to Jim Fowler's discussion TREAT modeling of mid-rise apartments low heating load
"So why is tenant behavior significantly different in this building?"
yesterday

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service