Commission debates alternate mansard roofing material; no vote, possible guideline review suggested

An owner seeking to replace a deteriorated mansard roof in the National Historic Landmark District presented a composite roofing product (described as the same brand used elsewhere in the city) and asked the commission to approve it. Applicant comments emphasized longevity and improved preservation of the underlying structure.

Architect Randall Henry and several commissioners said the mansard is a highly visible architectural feature that influences how the entire building is experienced from the public right-of-way; they expressed concern that an engineered, non‑weathering composite product may not age or texture like traditional slate or wood shakes. Building official Jeff Bergstrom, introduced at the meeting, said from a safety and code standpoint the product is Class A rated and an improvement over some existing materials.

Commissioners debated three points: (1) the commission’s purview is exterior appearance and materials visible from public ways, (2) whether consistent application of guidelines requires denying an alternate material on a highly visible mansard, and (3) whether the guidelines themselves should be revisited to allow some alternate materials in specific circumstances. Several commissioners recommended tabling a formal policy change and suggested placing a potential guidelines-review item on a future agenda for broader public discussion. The transcript records vigorous discussion but no final policy change or vote to approve the composite product for this specific mansard roof.