Historic‑district group opposes EIFS retrofit proposed for 449 Twelfth Street; LPC approves cladding with staff conditions

The Landmarks Preservation Commission approved Aug. 12 an application to install an exterior insulation and finish system (EIFS) on the rear (non‑public) facades of 449 Twelfth Street in the Park Slope Historic District Extension, finding that the work addresses extensive moisture and interior damage. The commission vote followed an extended technical hearing and a written objection from the Historic Districts Council. Applicant representatives from Darius Toraby Architects and the building’s consultants described widespread stucco cracking, moisture penetration and interior mold associated with an older cement stucco covering and a lack of insulation behind the wall. They proposed applying a waterproofing membrane over the existing coating, installing metal lath, adhering two inches of rigid insulation and applying a reinforced trowel stucco finish. The team said the existing stucco was well attached and that removing it could damage the masonry substrate. Kaylee Johnson of the Historic Districts Council, speaking remotely during public testimony, called the EIFS approach inappropriate: “EIFS systems are completely ineffective and will only hasten this building’s demise by trapping even greater amounts of water within the masonry wall,” she said. HDC recommended repairs to coping, flashing and a traditional cementitious stucco or a breathable coating instead. Commission discussion focused on technical details: whether the top‑of‑parapet treatment and coping would properly shed water, the possibility of returning insulation at the window jambs to reduce thermal bridging, whether expansion joints were required for the proposed cladding, and the condition and routing of utility cables that run below the coping. Commissioners pressed for details about work sequencing, moisture testing and weather‑sensitive installation practices. LPC staff reported that EIFS systems have acceptable technical assemblies when installed with appropriate details and that the proposed color and fine sand trowel finish would be visually consistent with painted or coated secondary facades in the immediate block. Commissioners asked the applicant to refine window jamb details, parapet/coping flashings and the top‑of‑parapet termination to reduce future water intrusion. The motion approving the work included a requirement that the applicant work with staff on final details. The vote was 10–0. Kaylee Johnson’s written statement and a letter from Brooklyn Community Board 6 (no objection) were submitted in advance of the meeting. The commission approved the work conditioned on the applicant’s continued work with LPC staff on parapet, coping and window‑jamb details.