Replies

1. GBA Editor
   Martin Holladay | Feb 16, 2015 06:51am | #1

   David,
   I'm not convinced this is a stumper. It's hard to be sure from the photo, but that might simply be cellulose.

2. 
   stuccofirst | Feb 16, 2015 07:18am | #2

   blown fiberglass?

3. 
   user-1006269 | Feb 16, 2015 02:51pm | #3

   My first thought was urea formaldehyde, but it looks a lot more like cellulose if you focus on what is on the rafters.
   If it is friable into dust, it is more likely urea.

4. 
   Peter_Rogers | Feb 16, 2015 04:59pm | #4

   The grey stuff on the rafters does look like cellulose, but I've never seen cellulose maintain a horizontal structure like it appears to in some areas down below on the floor... anyone else see what I mean? Cellulose can certainly go in unevenly if installed poorly, but unless it's wet-sprayed I've never seen it do anything like that. I'm leaning towards UFFI.

5. 
   Peter_Rogers | Feb 16, 2015 05:06pm | #5

   "White, powdery" also makes it sound like UFFI... but it really does look like cellulose... man, this is really bugging me.

6. 
   davidmeiland | Feb 16, 2015 05:10pm | #6

   Here is the forum thread the photo comes from http://inspectorsjournal.com/forum/topic.asp?TOPIC_ID=19603 and it turns out there are more photos https://www.flickr.com/photos/8377217@N02/with/15827472191/

   I have nothing to do with this situation, just a curious onlooker.

7. GBA Editor
   Martin Holladay | Feb 16, 2015 05:17pm | #7

   Sure looks like cellulose to me.

   .

   
8. 
   Peter_Rogers | Feb 16, 2015 05:25pm | #8

   the crawlspace is a total swamp... which explains the weird clumping I noted earlier.

9. 
   davidmeiland | Feb 16, 2015 08:26pm | #9

   Nothing like a thread where the OP withholds all the really useful information until the end.

10. 
    Peter_Rogers | Feb 16, 2015 11:02pm | #10

    hahaha, yeah, just cellulose.