Rooftop stair accessing the multi-level roof. Installed on roof-top curb which is a structural element under the roof membrane that the stair unit is mounted to.

When installing stairs on roof-tops, a curb is sometimes used and an important element in keeping roof water tight when mounting mechanical units and stairs.

The curb is raised under the roof membrane, which allows for stairs and mechanical equipment to be mounted directly onto it. The long structural galvanized steel unit also known as a “rail” can hold up pipes or duct pedestals that don’t penetrate through into your shingles – they’re just secured by treated wood posts placed on either side of these supports so you won’t have any leaks!