Photo shows an attic cat walk with insulation retaining dams. The purpose is to allow safe access to mechanical systems in the attic, for future service needs. This is part of our standard job when properly air sealing and insulating. This attic was insulated with cellulose insulation to R-60.
This is the same cat walk, looking back towards the attic hatch.
How to provide safe access in the attic to mechanical equipment.