The Applied Structural Drying (ASD) certification covers the effective, efficient, and timely drying of water-damaged structures and contents within a restorative drying environment. The certification is for the water damage restorer who has achieved the Water Restoration Technician (WRT) certification and understands water-damaged environments and employee health and safety in the workplace. Upon attaining the certification, you demonstrate you are prepared to perform drying strategies while protecting the health and safety of workers and occupants.