SECTION 02220 – DEMOLITION (BASE BID) 1. Areas 1, 4, 5, 6, 7 & 8 - Remove existing thermoplastic membrane, insulation, recovery board and BUR membrane to the level of the existing metal or concrete deck. Remove existing debris and protrusions, as required to provide a smooth, solid substrate for installation of new roofing materials. 2. Area 9 – Power broom existing gravel surface and dispose of aggregate off-site. Remove existing debris and protrusions, as required to provide a smooth, solid substrate for installation of new roofing materials. 3. Contractor shall provide interior protection below their work in areas designated by the Owner. Interior protection shall be installed by a firm specializing in this work, such as TuffWrap, and not be performed by the contractor’s own personnel. Contractor shall include the cost of below-deck dust protection in his Base Bid and show this as a line item in the Schedule of Cost. 4. At the location of FCG’s test cuts the composition of the existing roofs are as follows: • Area 1 - Concrete roof deck, ¾” Perlite insulation, BUR plies and granular-surfaced cap sheet. Total Thickness- 1 ½”. • Area 4 - Metal roof deck, 1” tapered polyisocyanurate insulation, BUR plies and granular-surfaced cap sheet. Total Thickness- 3”-5”. • Areas 5 & 8 - Metal roof deck, 2” extruded polystyrene insulation, ½” wood fiberboard and adhered EPDM membrane. Total Thickness- 3”. • Areas 5 & 8 - Metal roof deck, 2” extruded polystyrene insulation, ½” wood fiberboard and adhered EPDM membrane. Total Thickness- 3”. • Areas 6 & 7 - Metal roof deck, composite Iso/Perlite insulation, BUR plies and granular-surfaced cap sheet, 1” Iso, 5/8” gypsum, fleece-backed TPO membrane. Total Thickness- 4 ½”. • Area 9 - Metal roof deck, gypsum board, Iso insulation, BUR plies and gravel surface. Total Thickness- 3”. The Owner will test the existing BUR membranes for asbestos. Results of this testing will be provided to Awarded Bidder. 5. Remove existing insulation and roof membranes to the deck. Repair/replace metal deck as required (see Section 05310). Include 1000 sq. ft. of metal deck replacement in the Base Bid: a. Provide a Unit Cost for quantities greater or lesser than the amount specified in the Base Bid. 6. Remove existing membrane flashings on curbs and pipes as required by the Membrane Manufacturer. 7. Remove existing edge metal and fascia. 8. Remove existing metal counterflashing and rain hoods. 9. Remove and dispose of abandoned and out of service equipment, as identified and directed by the Owner. Resulting openings in the deck shall be patched with matching metal deck panels. 10. Disconnection of any mechanical or electrical equipment for the purposes of this demolition must be carefully coordinated with the Owner. Disconnection and reconnection is the responsibility of the Contractor. 11. Inspection - verify that the roof and all components have been properly removed and disposed of and that the substrate is acceptable for the installation of new materials. 12. Roof removal and material installation shall proceed only when no precipitation is imminent. Install only as much insulation and roof membrane as can be completed by the end of the day. The building must be maintained weatherproof at all times. The Contractor is responsible for making construction under this contract rainproof. If he is prevented from so doing by any limitations of the Scope of Work or the existing site conditions, the Owner shall immediately be given written notification of such limitations before construction proceeds in the area where the problem exists. The Contractor may then only proceed upon written approval of the Owner. 13. The Contractor shall plan and execute all work in a manner that provides safe access and egress to the building for the Owner and his personnel, and shall provide all necessary barricades, warnings, signs, monitors, etc. for the Owner’s protection during the course of the work. SECTION 02220– DEMOLITION/PREPARATION ALTERNATE – Areas 2 & 3 1. Proceed with rehabilitation work only when existing and forecasted weather conditions permit work to proceed without water entering into the existing roofing system or building. 2. Store all materials as required by the manufacturer. 3. Apply coatings within range of ambient and substrate temperatures recommended by the manufacturer. 4. Protect building, adjacent buildings, walkways, site improvements, exterior plantings and landscaping from damage or soiling from rehabilitation operations. 5. Maintain access to existing walkways, corridors and other adjacent occupied or used facilities. 6. Coordinate installation of roofing so insulation and other components of roofing system not permanently exposed are not subjected to precipitation or left uncovered at the end of the workday or when rain is forecast. 7. Where required, Replace or reattach deteriorated and displaced existing sheet metal, including; coping and counterflashing, edge metal and fascia. 8. Repair all delaminated membrane seams and dis-bonded patches. Cut and repair bridging membrane flashings. 9. Inspection - verify that the roof and all components have been cleaned, prepared or properly removed and disposed of and that the substrate is acceptable for the installation of new materials. 10. Disconnection of any mechanical or electrical equipment for the purposes of this demolition must be carefully coordinated with the Owner. Disconnection and reconnection is the responsibility of the Contractor. 11. Roof repair and material installation shall proceed only when no precipitation is imminent. Install only as much material as can be completed by the end of the day. The building must be maintained weatherproof at all times. 12. The Contractor shall plan and execute all work in a manner that provides safe access and egress to the building for the Owner and his personnel, and shall provide all necessary barricades, warnings, signs, monitors, etc. for the Owner’s protection during the course of the work. Erection of these shall be strictly coordinated with the Owner.
