Here are some guidelines.
Old brown attic insulation.
Brown insulation is made up of mineral wool which comes from either rock natural materials or slag the scum on the surface of molten metal.
If the insulation lays flat.
Dirty attic insulation on the other hand could have been the result of pests like rodents and birds that contaminated the insulation which can lead to an unhealthy home.
If the insulation particles have a certain colour usually grey brown or silver gold.
Department of energy notes that 75 percent of mineral wool is derived from post industrial content.
Believe it or not there are situations in a home when you should remove the old attic insulation before adding more over the existing and in this short video.
If either of these situations are the case it s time to remove insulation.
The particles of the insulation have an accordion like texture.
Loose lay greyish brown insulation with wood or paper chunks cant tell to scared to touch it also has green and pink red flecks like paper but looking atr iut in operson it looks greyish more so than brown but when i take a picture it looks more brownish in the picture could be the light playing tricks but in real like its a couple more shades.
Old attic insulation is often inefficient and could lead to unnecessarily high energy bills.
It is made from a natural mineral material that is mined from the earth.
Brown insulation is available in either blanket rigid foam board or loose fill form.