Shelter on Steel Frame
As a result of our early entry into the telecom sector in 1989, many of the approaches, processes and details we developed over the years have become “industry standards”. Examples of these include:
- two week turn-around for drawings,
- how mobile phone equipment shelters and rooms are treated by building department plans examiners,
- rooftop equipment shelters raised above the roof deck on 2’ to 3’ posts,
- non-penetrating antennae supports.

Visit our Telecom Picts page for examples of Prosum drawings & work carried out over a quarter of a century in the telecom sector.

When we first began working in this sector, details by other consultants typically showed rooftop timber walkways and cable trays anchored or weighted down with blocks to hold them in place. This created a waterproofing nightmare where penetrations were employed, or a construction problem when using blocks as ballast. Yet, on visits to dozens of rooftop sites where existing timber access walkways were not tied to the roof or held down with weights, we observed that these were not blown off the roof, in spite of 20 or more years of service, and showing evidence of deterioration from the environment. They remained in place, yet undisturbed. When we proposed walkways and cable trays with no anchorages or ballasts, plans examiners pointed to the wind load provisions of the OBC/NBC, and also to consultants submitting drawings showing anchorages and ballasts for these rooftop elements. In order to counter such arguments, we researched the issue and performed calculations. The result was a paper published discussing the matter, and showing why anchorages or ballasts were not required.

Uplift on Rooftop Walkways and Cable Trays was published in the NRC’s Canadian Journal of Civil Engineering (Vol. 26, No. 1, 1999, pages 119-122). This paper has since made the rounds not only of the municipal plans examiners, but also of other consultants providing services to the telecom sector. Subsequent to the publication of our paper, municipal plans examiners stopped requiring that walkways and cable trays be anchored to roofs or weighted down with ballast.