Sounds like rock wool.
http://www.bing.com/images/search?q...3FAF72BD2F1C140DCDA48B3C3E530&selectedIndex=0
Most often it's blown in.
Any Box store will have it.
If you buy 10 bags they will let you borrow the blower for free.
This is the amount you were suppost to have up there.
http://www.energystar.gov/index.cfm?c=home_sealing.hm_improvement_insulation_table
Before adding more you need to air seal the attic, nothing more then sealing up any holes in the top plates and all lights and ceiling fans showing in the attic with expanding foam.
http://www.bing.com/images/search?q...3FAF72BD2F1C140DCDA48B3C3E530&selectedIndex=0
Most often it's blown in.
Any Box store will have it.
If you buy 10 bags they will let you borrow the blower for free.
This is the amount you were suppost to have up there.
http://www.energystar.gov/index.cfm?c=home_sealing.hm_improvement_insulation_table
Before adding more you need to air seal the attic, nothing more then sealing up any holes in the top plates and all lights and ceiling fans showing in the attic with expanding foam.