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Ames City subcommittee weighs double vs. triple‑pane windows for Old Town Historic District; plans draft ordinance language
Summary
A subcommittee recommended language to allow insulated double‑pane windows in some cases while generally discouraging triple‑pane units that alter historic character; the commission asked for a draft to review at the November meeting and to potentially refer to City Council.
Commissioners discussed research from a subcommittee charged with reconciling Ames’ energy goals with its historic preservation ordinance for the Old Town Historic District. The subcommittee reported outreach to other communities and preservation planners and said triple‑pane glazing is generally not recommended where visual historic character must be preserved; double‑pane insulated glazing units may be acceptable in limited situations.
An unnamed subcommittee researcher summarized findings: "we did not find any community or, the NPS recommend triple pane" and said alternatives such as storm windows or carefully specified double‑pane units had been used to preserve appearance while improving efficiency. Commissioners debated whether storm windows meet energy goals and raised cost concerns for custom storm systems. The group discussed typical glazing thicknesses — roughly a 1/4‑inch single pane, about a 1‑inch double‑pane IGU, and up to around 1 3/4‑inches for triple‑pane — and how those depths can affect appearance depending on window placement within the wall.
Commissioner (unnamed) 3 framed the policy tradeoff: allowing upgrades only after windows are "deteriorated beyond the point of being salvageable" can encourage deferred maintenance. "If somebody wants to improve the energy efficiency of their home by having an actual insulated window, let's give them the framework to do so and to do it appropriately," the commissioner said.
The subcommittee will prepare draft ordinance language and clearer definitions (for terms such as "pane," "light," and "glazing unit"). Melissa is expected to provide a draft for the commission to review at the November meeting (noted by commissioners as November 10); if the commission approves that draft it will be forwarded to the City Council for consideration of a code amendment.
The commission did not adopt ordinance language at this meeting; members agreed to reconvene the subcommittee and present a written proposal for a future vote.
