Fiberglass vs Cellulose Loose Attic Insulation

Situation:

• 25 yr old house
• Colorado
• Desired R-50
• Currently has loose fiberglass insulation
• No issues with moisture, animal infestation, etc.

I've gotten two bids to air seal the attic and bring the insulation up to R-50.

Company A will move the existing insulation around in order to get the air sealing done. Then they'll blow in additional fiberglass to get it up to R-50.

Company B completely removes all existing fiberglass insulation, air seals, and blows in...

Fiberglass vs Cellulose Loose Attic Insulation