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Commission approves rear conservatory addition at 713 Glass Lane with conditions on window specifications
Summary
A 484‑square‑foot rear conservatory/sun porch addition at 713 Glass Lane in the Boyd Mill Avenue historic district was approved by the commission; staff noted the proposed low‑slope rubber membrane roof and required window specifications prior to permitting.
On March 10 the Franklin Historic Zoning Commission approved a 484‑square‑foot rear addition at 713 Glass Lane, a nonhistoric building within the Boyd Mill Avenue historic district, conditioned on submission of window specifications and other staff requirements.
Emily, preservation staff, told commissioners the proposed addition is sited to be invisible from Glass Lane and would be largely glazed, functioning as a conservatory or sun porch. Staff flagged that roofing options for the low‑pitch roof are limited; the applicant proposes a welded rubber membrane (EPDM/2‑ply welded membrane) because the roof pitch is low (reported at approximately 1:12). Staff recommended approval subject to provision of window specifications before permitting.
Property owner Jay Sheridan attended and said the design team may use accordion glazing but would coordinate final details with staff; architect Michael (identified in the meeting as the project architect) confirmed the membrane choice is due to the low pitch and noted the material will not be visible from the street. Commissioners asked follow‑up questions about the roof pitch and flashing; the architect explained typical low‑slope options (standing seam metal or welded membrane) and confirmed membrane flashings will be welded and sealed.
A motion to approve the rear addition with staff conditions passed; staff will require final window specifications and other construction details prior to permit approval.
