My attic is 530 sqft, with soffits, ridge vent and some 18"X18" window with mesh over it (I cant recall its name). The house was built in 1960 and has batt insulation on the attic floor. The batt insulation is about 6" deep. It somewhat looks like the top left of this
My question is, is it ok that the top of the batt insulation is dirty since my attic has soffit vents? As I've read, dirty means there's air movement, but doesn't it make sense that there's air movement where there are soffits and ridge vent? I'm trying to figure out if I need to air seal and insulate more.