Any ideas what type of insulation this is?

[John Lindley-Howard]

I came across this white fluffy insulation in an attic and was wondering if anyone knew what it is.

[John Arnold]

Looks like cellulose.

[Jerry Peck]

Looks like blown in fiberglass to me.

I like the double top plate cut completely in two for those PVC pipes (condensate drains?).

[Joseph Hagarty]

If an older home, RockWool.

[Jerry Peck]

If an older home, RockWool.

Unless it is an older home with newer insulation. :D

Also, all the rockwool I've seen has been darker, grayish-blackish in color.

[Dom D'Agostino]

Looks like blown in fiberglass to me.



I agree.

Dom

[Markus Keller]

That definitely looks like the blow in stuff I see in suburban new construction

[Brandon Whitmore]

Newer blown in fiberglass.

[John Kogel]

Fiberglass.
They are now making it fluffy, but it's still fibrous glass. Not cellulose, which is shredded organic, wood or paper based, and certainly not rockwool.

[James Bohac]

Definitely blown Fiberglass! I believe made by Certainteed called Insulsafe. Good stuff and doesn't make you itch like the pink or yellow fiberglass.