Bill Kibbel Posted November 6, 2012 Report Share Posted November 6, 2012 Small 7200 sq. ft., 25 year old, 1 storey professional building w/6 suites. Area separation divides to 3 attic spaces. In one shared attic over a dentist office and insurance office, the blown-in fiberglass is like slate grey throughout, and dark black in 2 areas. I can usually find the cause of discolored insulation, but not this time. Click to Enlarge 43.3 KB Trusses, plywood decking and OSB gable sheathing have no discoloration. No evidence of any previous fire or smoke and absolutely no odor. No combustion appliances ever in the building (HPs & small elec. water heaters). Only spots of very small previous flashing leaks. No excessive moisture anywhere in the building. No production/manufacturing ever in the building. Quote Link to comment Share on other sites More sharing options...
Nolan Kienitz Posted November 6, 2012 Report Share Posted November 6, 2012 = Quote Link to comment Share on other sites More sharing options...
Richard Moore Posted November 6, 2012 Report Share Posted November 6, 2012 If you Google "pest control insulation" you come up with a few links to products that may be what you have there. Terminex, Orkin, etc have this as an option, blown in over existing insulation.. I haven't seen it myself, but it does look similar to the stuff in your photo. Have a look at the photo at http://en.prnasia.com/story/67926-0.shtml Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted November 6, 2012 Report Share Posted November 6, 2012 The picture looks like someone blew in rockwool and cellulose on top of pink fiberglass. Quote Link to comment Share on other sites More sharing options...
hausdok Posted November 6, 2012 Report Share Posted November 6, 2012 I'm with Jim, It looks like old tech rockwool. See it all the time and every once in a while it's all churned up with other stuff that was blown in before or after. ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
Chad Fabry Posted November 6, 2012 Report Share Posted November 6, 2012 Insulation contractors here are increasingly using a product called Eco Batt. The color of the fiberglass ranges from grey to black. The website call it brown, but it's grey to black. Quote Link to comment Share on other sites More sharing options...
Tom Raymond Posted November 6, 2012 Report Share Posted November 6, 2012 Except those are batts, Kibble's stuff is clearly blown in. The color of stabilized cellulose is changing. As newspapers shrink, local weeklies merge or disappear, and magazines go digital, manufacturers are looking at different material sources. Up to 1/3 of Applegate cellulose is made of 'brown board', essentially cereal box material. It's very dark grey. I've never seen it black. Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted November 6, 2012 Author Report Share Posted November 6, 2012 The pink is a few random batts. The yellow is the blown-in fiberglass that has turned gray in some areas and black in a couple large spots. It's not any type of mineral wool and nothing was added over the original insulation. I can't open the link, but the pest control insulation I've seen is cellulose and a consistent gray throughout. Quote Link to comment Share on other sites More sharing options...
Sarah Wold Posted November 22, 2012 Report Share Posted November 22, 2012 Yes it rockwool insulation which is grey in color. Quote Link to comment Share on other sites More sharing options...
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