Construction Services for Roofing Replacements and Upgrades at Engine Houses 4, 5, 8, 20, and 24

If a prospective bidder has any questions relative to this solicitation, the prospective Bidder shall submit the questions in writing. The prospective Bidder shall submit questions no later than 4:00 p.m., EST on December 21, 2022 through the DGS portal using the link below. The District of Columbia Department of General Services ("DGS" or "Department") is issuing this Invitation for Bids ("IFB") to engage a Small Business Enterprise ("SBE") firm contractor ("Contractor") to complete all necessary services, supervision, permits, labor, supplies, equipment, and materials for Roof Replacement and Upgrades at Engine Houses 4, 5, 8, 24 and 20 (the "Project"). The Contractor shall complete the Standard Work Requirements, as described in Section C, Specifications/Scope of Work Statement ("SOW"). Bidders are required to submit with their bid a bid bond in the amount of five percent (5%).All bonding companies must be included on the Department of Treasury's Listing of Approved Sureties. Alternatively, Bidders may submit a cashier's check in lieu of a bid bond The Contractor shall require that all trade subcontractors provide a payment and performance bond having a penal value equal to One Hundred Percent (100%) of the cost of the trade subcontract. All such bonds shall be written on a dual-oblige basis. The Department reserves the right to accept/reject any/all bids resulting from this IFB. The CO may reject all bids or waive any minor informality or irregularity in bids received whenever it is determined that such action is in the best interest of the District. The term of the Contract shall be from the date of the CO's execution through March 31, 2023 ("Substantial Completion Dates"). Final Completion shall be required by no later than April 28, 2023 ("Final Completion Date"). An administrative term of May 31, 2023 ("Administrative Term Date") is established for the sole purpose of permitting the Department's Office of the Chief Financial Officer to process payments in the event any payments become due. Notwithstanding the foregoing, nothing herein shall be construed to: extend the Substantial Completion Date; extend the Final Completion date; or, limit the Department's ability to assess liquidated damages thereon. Engine 4: The Scope of Work for this project includes a Capital Roof Replacement for Roof Areas A, B, C, and D with demolition of the existing sprayed in place polyurethane roof system and the 3 ply built-up roof system down to the existing concrete roof deck and properly dispose of the same in accordance with local codes and ordinances. The new roof system shall be installed to meet or exceed all local and national codes for a UL Class A and FM I-90 application. The new roof system shall consist of a 30 mil SBS vapor retarder, a base layer of 2" CGF isocyanurate roof insulation, ASTM C 1289 Type II, Class 2 Grade 2 (20psi), second layer of Tapered CGF isocyanurate roof insulation, ASTM C 1289 Type II, Class 2 Grade 2 (20psi), a new 1/2 " CGF HD coverboard ASTM C 1289 Type II Class 4 Grade 2(100 +psi) (Rtotal=33.00) and an adhered 60 mil TPO / PVC roofmembrane. Additional work includes adding 2x wood nailers to roof edge and roof curbs to accommodate new roof insulation thickness to achieve manufacturers' minimum flashing height of 8" from the finished roof surface. Also included is installing a new roof hatch, raising the existing BAC unit to accommodate new rail curb flashing, and new pre-manufactured perimeter trim metal to be incorporated into the roof system warranty. All new roofing is to be installed for the special Project warranty requirements to meet or exceed the manufacturers 20-year total system NDL warranty. Engine 5: The Scope of Work for this project includes a Capital Roof Replacement for Roof Areas A and B with demolition of the existing roof system down to the existing wood plank roof deck and properly dispose of the same in accordance with local codes and ordinances. The new roof system shall be installed to meet or exceed all local and national codes for a UL Class A and FM I-90 application. The new roof system shall consist of a mechanically attached 1/2 " base glass faced gypsum firebarrier board, a 30 mil SBS vapor retarder, a base layer of CGF isocyanurate roof insulation, ASTM C 1289 Type II, Class 2 Grade 2 (20psi), second layer of CGF isocyanurate roof insulation, ASTM C 1289 Type II, Class 2 Grade 2 (20psi), and a new 1/2 " CGF HD coverboard ASTM C 1289 Type II Class 4 Grade 2(100 +psi). All construction layers to achieve an R-total =33.00. The new roof covering is to be an adhered 60 mil TPO / PVC roof membrane.Additional work includes adding 2x wood nailers to roof edge and roof curbs to accommodate new roof insulation thickness to achieve manufacturers' minimum flashing height of 8" from thefinished roof surface, new access door, masonry re-pointing and a wall penetration waterproofing application. Also included is installing new pre-manufactured perimeter trim metal, gutter and downspouts to be incorporated into the roof system warranty. All new roofing is to be installed for the special Project warranty. Engine 8: The Scope of Work for this project includes a Capital Roof Recover for Roof Area A. The existing roof system at Roof Area A consists of an aggregate surfaced coal tar built-up roof system. Loose gravel will be removed with hydrovac to provide a clean, dust free, dry surface. The roof will be prepared as required by the manufacturer including cutting out all blisters, sealing and priming if required. 2" CGF polyisocyanurate insulation will be adhered to the prepared roof system as required to meet specified uplift pressures. Install a new 60 mil TPO adhered roof system and associated edge metals. Include a minimum of a 10-year manufacturers NDL warranty. Engine 20: The Scope of Work for this project includes roof coating system at Area D with a new urethane traffic coating with a minimum 10-year NDL warranty. Work also includes refurbishment of cap and pan clay tile at Area B and standing seam metal roofing at Area C as well as refurbishment of gutters and downspouts at Areas B and C with the Contractor's maximum installation and repair warranty. Roof Area A is not included in the scope of work. The following are the Refurbishment scope of work quantities: 1. Defects: Section B - Refurbish broken and/or missing tiles, properly resecure/install new tile to match existing with copper wire or repair clips with copper nails. Quantity: 40 EA. 2. Defects: Section C - Restore the transverse seam sealant at (6) dormer locations as defined on the contract drawings, approx. 300 lin. Ft. 3. Water test all gutters prior to construction. Plug downspout outlets, Fill gutters with 2" of water, and allow to set for 4 hours. Note any leakage - repair adjacent seams to where the leak is observed. Approx.12 locations. Engine 24: The Scope of Work for this project includes Capital Roof Replacement for Roof Areas A, C, D, and F consists of the following: remove existing built up roofing, aggregate, and insulation down to the existing precast concrete deck. Refurbish concrete deck as needed on a unit rate basis, document with quantities and photographs. Furnish and install a new 80 mil PVC membrane fully adhered over 1/2 " ASTM C 1289 Type II Class 4 Grade 2 (100+ psi) CGF Polyisocyanurate (ISO) HD coverboard and ASTM C 1289 Type II, Class 2 Grade 2 (20 psi) or Grade 3 (25 psi) ISO insulation (R-33 total system) with first layer fully adhered to the precast concrete roof deck and all other layers fully adhered above. Additional work includes raising existing equipment (verify quantity in field), equipment line support blocks (verify quantity in field), gas/conduit service piping (verify quantity in field), installing walk pads from roof access locations and rooftop equipment access doors, and replacing surface-mounted flashings. Replace metal coping at transition between parapet wall and tile roof at Area A. Existing stone copings will not be replaced. Existing roof drains may be salvaged and reused, replace as necessary to restore performance. Provide tapered insulation to sump to drains and provide crickets around curbed equipment to promote positive drainage. Replace plastic drain strainers with cast iron strainers (verify quantity in field). Provide new splash pans for downspouts discharging onto low slope roof areas (verify quantity in field). Provide minimum 25-year NDL manufacturer's warranty. Work also includes capital roof refurbishment of clay tile as well as repair of gutters and downspouts at Areas B and E with contractor's maximum 5-year installation and repair warranty

Division 03 -	Concrete, Concrete Forming and Accessories, Precast Concrete, Site-Cast Concrete.
Division 04 -	Masonry, Unit Masonry.
Division 05 -	Metals.
Division 06 -	Wood, Plastics, and Composites, Rough Carpentry, Finish Carpentry, Architectural Woodwork, Architectural Wood Casework.
Division 07 -	Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection, Weather Barriers.
Division 08 -	Openings, Doors and Frames, Wood Doors, Plastic Doors, Windows, Hardware, Glazing, Louvers and Vents.
Division 09 -	Finishes, Plaster and Gypsum Board, Ceilings, Carpeting, Painting and Coating.
Division 10 -	Specialties, Toilet, Bath, and Laundry Accessories.
Division 11 -	Equipment, Residential Equipment, Residential Appliances.
Division 22 -	Plumbing, Instrumentation and Control for Plumbing, Plumbing Piping, Plumbing Equipment, Plumbing Fixtures, Residential Plumbing Fixtures.
Division 23 -	Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Air Distribution.
Division 26 -	Electrical, Instrumentation and Control for Electrical Systems, Lighting.
Division 27 -	Communications, Structured Cabling.
Division 31 -	Earthwork, Grading, Excavation and Fill, Earthwork Methods, Soil Treatment.
Division 32 -	Exterior Improvements, Flexible Paving, Irrigation, Planting, Turf and Grasses.
Division 33 -	Utilities, Water Utilities, Sanitary Sewerage Utilities, Electrical Utilities, Communications Utilities.