Cambridge OpenGov #COC-CIFB-FY27-31196GC

Cambridge 689 Mass Ave roof replacement and building-envelope repairs

The City of Cambridge is seeking a general contractor to replace roofing and complete related building-envelope work at 689 Mass Ave in Cambridge, Massachusetts. - Government buyer: City of Cambridge, Purchasing Department; awarding authority is the City of Cambridge. The filed sub-bid tab sheet names Liz Unger. - Project scope: Remove existing roofing in areas A, B, C, D, and F and install a fully adhered single-ply roof assembly with air/vapor retarder, insulation rated at least R-30, tapered insulation, cover board, and 60-mil EPDM membrane. Roof E is otherwise out of scope, although one drawing item identifies a replacement downspout there. - Other work: Replace specified roof drains and drainage components; install copper flashings, scuppers, downspouts, conductor head and splash blocks; add roof-edge blocking and flashings, non-penetrating equipment supports, walkway pads, safety guardrails, a roof ladder, a roof hatch, and a penthouse door assembly. Include roof-deck review and directed repairs, drain video-scoping and cleaning, and lightning-protection removal/replacement and certification work. - Specified quantities: One 6-inch cast-iron drain at Roof A and one 4-inch cast-iron drain at Roof D; one each of the listed DS-1, DS-2, and DS-3 downspouts; one each of SC-1 and SC-2 scuppers; one roof ladder and one penthouse door assembly. Unit-price allowances include 500 cubic feet of concrete deck repairs, 100 square feet of supplemental insulation, and 50 board feet of wood deck repairs. Other listed items have no stated quantity. - Named product manufacturer: Jandris Block, specified for 4-inch architectural ground-face CMU, part number 2508G, for the door infill. No roofing membrane OEM is specified. - Named project/design firms: CambridgeSeven prepared the plans and specifications; ARUP is also referenced in the bid materials. - Named filed sub-bid vendors: Waterproofing, damp-proofing and caulking: American Women Foundation, Beacon Waterproofing & Restoration, Inc., P.J. Spillane Company, Inc., G.V.W., Inc., and TWC Operations, LLC. Roofing and flashing: American Women Foundation, almar, llc, Greenwood Industries, LLC, Titan Roofing Inc., Emmaty, Inc., and The Aulson Company, INC. Plumbing: American Women Foundation, Araujo Bros Plumbing & Heating, Robert W. Irvine & Sons, Inc. - WBE, Citywright, LLC, and Stallion Plumbing, Heating & Cooling. The tab sheet marks some bids as not considered and includes restrictions on which general contractors may use certain filed sub-bidders. - Reported sub-bid totals: Roofing and flashing bids range from $467,000 to $604,682; waterproofing bids range from $26,300 to $45,000 among the listed bids not marked as unable to be considered; plumbing bids range from $9,000 to $17,100 among the listed bids not marked as unable to be considered. - Notable requirements: The facility is occupied and operational, so work must be coordinated to maintain egress and operations. General bidders must provide DCAMM eligibility for General Building Construction. Bid materials also state a 10% MBE participation effort target and Cambridge workforce, responsible-employer, and construction-safety requirements.

Description

The City of Cambridge is seeking a general contractor for roof replacement and minor envelope repairs at 689 Mass Ave in Cambridge, Massachusetts. The work includes removing existing roofing assemblies and installing a new fully adhered single-ply roofing system, along with roof drain, flashing, and related accessory work. General bidders must submit a DCAMM certificate of eligibility and update statement for General Building Construction. Bids are submitted electronically through the OpenGov Procurement Portal and are due November 5, 2026, at 2:00 p.m. Eastern Time.

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