The main roof single-ply PVC membrane was due for replacement, due to general age, wear and loss of plasticizer. The existing single-ply EPDM roof system on the Atrium Roof was due for replacement due to general age and wear. Both roofs had no consistent slope towards the internal roof drains and as a result ponding water was common on each roof. Vital Structures evaluation also noted the following concerns:
- Brick masonry through-wall flashings with no end-dams at termination points, allowing moisture to enter into the atrium below.
- Low flashing heights at brick masonry walls, fall protection roof anchors, mechanical units and skylights, necessitating modifications of each in order to replace the roof system and meet slope-to-drain and insulation code requirements.
- Hazardous materials analysis found that asbestos-containing mastics and built-up-roofing were present below both roof systems.
- Damaged roof drain components.
- Substantial ponding water between two (2) skylights with poor slope-to-drain conditions.