Scope of Work:

1. The work contemplated by the Contract Documents includes the Work of all trades required and all labor, equipment, materials and supervision necessary and incidental to the Work indicated. The following descriptions of the Work represent a brief summary of the Project. For additional and more complete information refer to the Project Manual and Drawings. The Drawings indicate and show limits of construction for this Project. The Drawings and Project Manual are complementary to each other and both shall be followed to complete the Work.
   
   Bidders are to be DCAM certified in Roofing. Bidders are informed of the following:
   
   PROJECT SCOPE
   
   The project scope consists of roof replacement to the Claypit Hill Elementary School, Wayland, MA. The general scope of the construction work is as follows. The existing roofing systems shall be removed down to the structural roof decking and replaced with a new roof replacement system. Repairs to any deteriorated structural decking are also to be included. The new roof replacement system shall be an adhered 60 mil PVC roofing system complete with new insulation (tapered in certain areas to provide positive drainage), new roof drains, new edge metal, new flashings, complete with a manufacturer’s 20-year full system warranty.
   
   ANTICIPATED PROJECT MILESTONE SCHEDULE
   
   Bidding Period July 1, 2004 to July 16, 2004
   PreBid Meeting July 7, 2004 at 1:00 p.m.
   Submittal/Construction Period July 20, 2004 to September 3, 2004
   
   A contract is expected to be promptly awarded to the lowest responsive bidder and the submittal phase is expected to commence on or before July 20, 2004. It is expected that all roof replacement work at the Claypit Hill Elementary School shall be completed on or before September 3, 2004. The Contractor will not be allowed to perform roof replacement work at the Claypit Hill Elementary School when school is in session. If this work is not completed within the specified time frame, the Contractor shall make watertight and safe all unfinished work areas and complete the work when school is not in session. In case the roof replacement work embraced in this contract shall not have been completed due to failure of the Contractor to complete the work or any part of the work within the time specified, the Town of Wayland shall recover as liquidated damages $1,000 per day for every day beyond the final completion dates or revised completion dates as extended in accordance with any change orders.
   
   
   
   
   1. SECTION 02050 – DEMOLITION - Demolition work shall include, but is not limited to the following:
      
      The complete removal and legal disposal of the existing roofing systems as required to accomplish the work as specified and detailed.
      
      The Contractor shall use extreme caution during roof removal and replacement operations. The Contractor is responsible for maintaining the roof in a watertight condition during the roof removal and replacement process. The Contractor is responsible for preventing any construction related material from entering the building and the roof drainage system(s) during the roof removal and replacement process.
      
      The following existing roofing system composition information has been compiled from a variety of sources. Actual conditions may vary. Contractor is required to verify existing roofing system composition, conditions and dimensions prior to submitting his bid. The existing roof system composition is as follows:
      
      1956 Structure (Main Roof Area--Elev. = 12’±) - This entire roof area is to be replaced as a “tear-off” application, therefore the existing roofing system (including membrane, flashings, insulation, sheetmetal, wood blocking, fasteners, abandoned penetrations, etc.) shall be completely removed down to the structural deck and legally disposed of. The existing roof system composition is as follows (from the top down): EPDM membrane, 1/4” ± extruded polystyrene, EPDM membrane, 1-1/2” ± polyisocyanurate insulation, gravel surfacing, multi-ply built-up roofing felts, 1/2”± fiberboard insulation, over gypsum roof deck.
      
      1956 Structure (Cafeteria Roof Area--Elev. = 19’±) - This entire roof area is to be replaced as a “tear-off” application, therefore the existing roofing system (including ballast, membrane, flashings, insulation, sheetmetal, wood blocking, fasteners, etc.) shall be completely removed down to the structural deck and legally disposed of. The existing roof system composition is as follows (from the top down): Stone ballast, EPDM membrane, 1-1/2” ± polyisocyanurate insulation, gravel surfacing, multi-ply built-up roofing felts, 1/2”± fiberboard insulation, over gypsum roof deck.
      
      1962 Structure (Elev. = 12’±) - This entire roof area is to be replaced as a “tear-off” application, therefore the existing roofing system (including ballast, membrane, flashings, insulation, sheetmetal, wood blocking, fasteners, etc.) shall be completely removed down to the structural deck and legally disposed of. The existing roof system composition is as follows (from the top down): Stone ballast, EPDM membrane, 1-1/2” ± polyisocyanurate insulation, gravel surfacing, multi-ply built-up roofing felts, 1/2”± fiberboard insulation, over cementitious wood fiber roof deck.
      
      1971 Structures (Elev. = 12’±) - These entire roof areas are to be replaced as a “tear-off” application, therefore the existing roofing system (including ballast, membrane, flashings, insulation, sheetmetal, wood blocking, fasteners, etc.) shall be completely removed down to the structural deck and legally disposed of. The existing roof system composition is as follows (from the top down): Stone ballast (only at north elevation adjacent to the library), EPDM membrane, 1-1/2” ± polyisocyanurate insulation, gravel surfacing, multi-ply built-up roofing felts, 1/2”± fiberboard insulation, over cementitious wood fiber roof deck.
      
      1971 Structure (Library--Elev. = 16’±) - This entire roof area is to be replaced as a “tear-off” application, therefore the existing roofing system (including ballast, membrane, flashings, insulation, sheetmetal, wood blocking, fasteners, etc.) shall be completely removed down to the structural deck and legally disposed of. The existing roof system composition is as follows (from the top down): Stone ballast, EPDM membrane, 1-1/2” ± polyisocyanurate insulation, gravel surfacing, multi-ply built-up roofing felts, 1/2”± fiberboard insulation, over cementitious wood fiber roof deck.
      
      
   2. SECTION 03512 – GYPSUM DECK REPAIRS – The work of this Section consists of furnishing and installing all gypsum deck repair products and related items as indicated on the Drawings and specified herein, required to complete the work. The Contractor shall include in the Bid his price for random removal and repair of 500 square feet (SF) of deteriorated gypsum roof deck. Provide unit prices for changes in the Bid Quantities for the specified work listed in this section on the Form for General Bid.
      
      
   3. SECTION 03530 – CEMENTITIOUS WOOD FIBER DECK REPAIRS - The work of this Section consists of furnishing and installing all gypsum deck repair products and related items as indicated on the Drawings and specified herein, required to complete the work. The Contractor shall include in the Bid his price for random removal and repair of 250 square feet (SF) of deteriorated gypsum roof deck. Provide unit prices for changes in the Bid Quantities for the specified work listed in this section on the Form for General Bid.
      
      
   4. SECTION 06100 - ROUGH CARPENTRY - The work of this Section consists of furnishing and installing all rough carpentry and related items as indicated on the Drawings and specified herein, required to complete the work.
      
      The existing wood blocking shall be re-used. Deteriorated wood blocking shall be replaced with new pressure treated wood blocking. The Contractor shall also include in the Bid his price for random removal and replacement of 200 board feet of deteriorated wood blocking. Provide unit prices for changes in the bid quantity for the specified work listed in this section on the Form for General Bid. Plywood and pressure treated are specified and detailed.
      
      
   5. SECTION 07220 - INSULATION - The work of this Section consists of furnishing and installing all roofing insulation and related items as indicated on the Drawing and specified herein, required to complete the work. The roofing system type including the insulation type and thickness varies throughout the roof areas as follows:
      
      Library Roof Area: Polyisocyanurate Insulation--1 layer of 3.0” thick rigid board; compressive strength shall be 20-psi minimum; insulation boards to be adhered to the roof decking with a cold process insulation adhesive, in accordance with a FM 1-90 fastening rate and pattern; .060” PVC membrane adhered.
      
      Remaining Roof Areas: Polyisocyanurate Insulation---tapered at 1/8” per foot; compressive strength shall be 20-psi minimum; insulation boards to be adhered to the roof decking with a cold process insulation adhesive in accordance with a FM 1-90 fastening rate and pattern; .060” PVC membrane adhered.
      
      Skylight Areas: All existing skylights on the 1956 addition are to be framed in together in groups of three, insulated and flashed with .060” PVC membrane. Insulation to be polyisocyanurate Insulation---One layer of 2.5” followed by one layer of tapered at 1/4” per foot; compressive strength shall be 20-psi minimum; insulation boards to be adhered to the plywood with a cold process insulation adhesive in accordance with a FM 1-90 fastening rate and pattern.
      
      General Notes: Crickets and sump areas are to be provided and shall be sized as detailed. A conceptual tapered layout is provided. Manufacturer’s produced tapered layout plan shall be submitted for review and approval.
      
      
   6. SECTION 07530 – PVC ROOFING AND FLASHING - The work of this Section consists of furnishing and installing all roofing and related items as indicated on the Drawing and specified herein, required to complete the work. The system shall be an adhered .060” (60 mil) PVC membrane roofing system as specified and detailed, complete with a manufacturer’s 20-year full system warranty. All flashings shall be installed permanently and concurrently with the roof membrane in order to maintain a watertight condition as the work progresses. Temporary flashings are not allowed.
      
      
   7. SECTION 07600 - FLASHING AND SHEET METAL - Furnish and install metal flashings required to complete the roofing application according to details and specified herein. This includes but is not limited to the sheet metal flashing at perimeter edge metal, cleats, clips, metal extender pieces, base wall counter flashing, scuppers and downspouts.
      
      
   8. SECTION 07900 - SEALANTS AND CAULKING - The work of this Section consists of furnishing and installing all exterior sealant and caulking materials required to complete the roofing application according to the details and specifications.
      
      
   9. SECTION 15100 - TEMPORARY MECHANICAL DISCONNECTS - The work of this Section consists of conducting all temporary mechanical disconnects of any rooftop or building mechanical equipment required to complete the roofing application according to the details and specifications. Contractor shall notify user of the facility and Owner a minimum 48 hours in advance of any disconnects.
      
      The work of this Section consists of conducting all necessary modifications to the existing rooftop units. The contractor is responsible for all disconnection, reinstallation, and HVAC unit modification work associated with any rooftop HVAC curb modifications. Various rooftop HVAC unit’s curbs may need to be modified so as to increase the flashing height. Contractor shall notify user of the facility and Owner a minimum 48 hours in advance of any unit modification work.
      
      The contractor is responsible to ensure the rooftop HVAC units remain operational as required by the user of the facility and Owner. Any damages that occur to the existing rooftop HVAC units as a result of the contractor’s operations shall be immediately corrected by the contractor at no additional expense.
      
      
   10. SECTION 15400 – PLUMBING - The work of this Section consists of replacing existing roof drain assemblies; to include new cast iron drain bowls, clamping rings, drain strainers, anchors, bolts, and under deck clamps, as specified and detailed. Contractor is responsible for providing all connections and alterations to accommodate the new work including removing the existing roof drain assembly, cutting the drain leader pipe down to the structural deck level and installing a new lead lining connection at the cast iron drain leaders.
       
       Prior to the start of work, Contractor shall inspect and verify the proper functioning of all roof drains and shall identify those that are slow flowing or clogged. Contractor shall snake free all drains at the start of the project and again at the project’s completion for a distance of 75 feet starting from the roof level.
       
       
   11. SECTION 16100 - TEMPORARY ELECTRICAL DISCONNECTS - The work of this Section consists of conducting all temporary electrical disconnects of any rooftop or building electrical equipment required to complete the roofing application according to the details and specifications. Contractor shall notify Owner a minimum 48 hours in advance of any disconnects.