What roof problems do commercial buildings have?
Flat and low-pitch roofs on commercial buildings tend to share a few problems.
- Ponding water. Roofs that do not drain well hold water, which speeds up wear on the covering.
- Failed joints and upstands. Seams, parapet details and pipe penetrations are the usual leak points.
- Blocked outlets and gutters. Leaves and litter back water up behind parapets.
- Ageing sheeting. Corroded metal sheets and cracked rooflights let rain through.
- Older fibre cement. Some older sheet roofs may contain asbestos. Do not drill, cut or break them, and arrange a proper survey first.
Regular checks catch most of this early. A roof inspection gives you a written record you can plan a maintenance budget around.

