I have an attic with blown in fiberglass insulation, probably original and 27 years old. The attic appears to have had some moisture issues in the past (bathroom vents being vented out of the soffit vents, which have been corrected) and the insulation is a little clumpy and a little dirty, but not terrible.
I want to add more insulation, but I'm not sure whether or not to use more blown in fiberglass or cellulose on top of it. I've read cellulose is the superior product. But I've read and saw videos of cellulose just being blown in on top of the fiberglass. I've read conflicting articles that says it's fine to do that and others say the cellulose will compact the fiberglass which isn't good for the existing fiberglass.
What should I do? Thanks!
Here is a pic of my current attic insulation: