Blow-in cellulose over existing fiberglass bats. Tony was great and worked with my very quick timeframe -- quote to install less than 48 hours apart. He also took the time to come over and inspect the work of his crew once the job was done and before getting paid. He also complimented the previous work that I had done. He was also a realist about spending the right amount of money on insulation that would yield the correct payback. I would use him again.