ARRA FBO Synopsis.pdf

Statement of Work

Roofing Replacement at the National Institutes of Health

1 PROJECT DESCRIPTION

The purpose of this SOW is to define the requirements and procedures for replacement of roofs at NIH. The roofs to be replaced are identified as individual options listed below.

1.1 PROJECT TITLE AND PROJECT CONTACTS

1.1.1 PROJECT TITLE, NUMBER AND LOCATION

Project Title: Roofing Replacement at the National Institutes of Health (ARRA) Project Number: HQC00563 Location: Building 1, Building 10, Building 14D, Building 15K, Building 60, Building

112 & Building T-1

1.1.2 PROJECT CONTACTS

Contracting Officer

Ms. Jessica Hadley, Contracting Officer Office of Acquisition Office of Research Facilities, NIH Building 13, Room 2E48 Bethesda, Maryland 20892 Telephone: (301) 594-3566

Project Officer

Mr. Roy Wright Maintenance Services Branch Division of Property Management Office of Research Facilities, NIH Building 13, Room B1E65D Bethesda, Maryland 20892 Telephone (301) 594-5763

2 DEFINITIONS

The following list provides definitions for terms found throughout this document:

100% Project Supervision The manufacturer shall provide a full-time employee present on site when the installer is on-site to monitor compliance to construction documents and provide daily reports with photos. These reports must accompany the warranty documentation at the conclusion of the project.

Accountability A sole-source design/build responsibility through all facets of construction management and the execution of the project with all financial risk throughout the project and warranty period borne by the Contractor.

Defect Each instance of noncompliance with a contract requirement. A defect may be caused by either nonperformance or poor performance. Each defect is subject to reperformance or deductions as described hereinafter.

Government Federal Government, including NIH.

Government Representative Any representative of the Government acting on behalf of the Government as assigned in various capacities including but not limited to the Contracting Officer (CO), Project Officer, Administrative Officer, Authority Having Jurisdiction, and persons performing other Government activities who are either Government employees or contracted employees not of this contract.

Hazardous Materials The Code of Federal Regulations (CFR 49) identified hazardous materials as a substance or material that the Secretary of Transportation has determined to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce. This is expanded to include items of supply (substances or material) that, because of its quantity, concentration, physical, chemical, or infection characteristics, may either cause of significantly contribute to serious, irreversible, incapacitating illness or an increase in mortality. Hazardous materials may also pose an environmental threat when improperly treated, stored, transported, disposed of, or otherwise managed.

Industry Standards Practices, procedures, or standards that are common within an industry or trade and which a reasonable and prudent person knowledgeable of that industry or trade would find acceptable as a measure of quality or acceptable procedure and which may or may not be defined in writing. May also be referred to as “standard industry procedures.”

Inspection The examination of a part to determine if it conforms to specifications.

Institute or Center NIH organization dedicated to a focused area of research.

Manufacturers’ Recommendations and Standards

Procedures recommended by the manufacturer of an item of equipment or material, conformance with which shall provide the most effective maintenance or best use of the item, and which shall preserve warranty rights, if available.

One Source Manufacturer’s Warranty

The warranty for the project must included material and labor.

Responsibility for any roof system failure (due to either materials or installation workmanship) shall be borne by the manufacturer.

Performance Warranty The warranty provides for a leak-free environment for the fifteen

(15) year warranty period as described in the SOW

Product Data Manufacturer’s standard schematic drawings, catalog sheets, brochures, diagrams, schedules, performance charts, illustrations, or other standard printer or electronic information on materials, products, and systems.

Project Officer An individual designated and authorized in writing by the CO to perform specific technical or administrative functions.

Quality Assurance The functions and associated actions performed by the Government to ensure that contract requirements are performed in accordance with specified standards and that an appropriate level of Contractor quality control activities are in place and operational, Quality Control Internal Contractor management functions that include, but are not limited to, training, documented procedures, inspections, and tests (taken at the point of performance) to ensure that Contractor products and services conform to SOW requirements, specifications, and standards.

Sample Consists of one or more service outputs drawn from a lot, the outputs being chosen at random. The number of outputs in the sample is the sample size.

Service Provider Furnished Property

All property and supplies other than Government Furnished Property required to perform the specified services of this ward.

Shall (or must) The use of either of these words specifies that the provision is binding and requires compliance.

Solvent Free All materials provided are either identified as “solvent free” or “water based”. Low volatile organic compound materials are not acceptable.

Standard An acknowledged measure of comparison.

Surveillance Inspection and documentation regarding delivery of contract services as measured against the contract specifications.

Turn-Key Design-build removal and replacement of the designated roof systems as indicated in the SOW. The Government identifies the roofing area and expects the Contractor to prepare specifications and drawings, contract labor force, provide full-time project supervision, provide fifteen (15) year leak free warranty, and a structured fifteen (15) year maintenance program at the completion of project.

2.1 ACRONYMS

The following list provides definitions for acronyms found throughout this document:

ASTM American Society for Testing and Materials

CFR Code of Federal Regulations

CO Contracting Officer

CLIN Contract Line Item Number

CPR Cardiopulmonary Resuscitation

CSPE Chlorosulfonated Polyethylene

FM Factory Mutual

GRM Grace Roofing Membrane

LPI Lightning Protection Institute

MSDS Material Safety Data Sheet

NIH National Institutes Of Health

NRCA National Roofing Contractors Association

ORF Office of Research Facilities

OSHA Occupational Safety And Health Administration

PM Project Manager

PO Project Officer psi pounds per square inch

QC Quality Control

QCM Quality Control Manager

SMACNA Sheet Metal and Air-Conditioning Contractors National Association

SOW Statement of Work

TPA Tri-polymer alloy

VOC Volatile Organic Compounds

2.2 GOVERNING DIRECTIVES

2.2.1 PUBLICATIONS AND FORMS

Publications that apply to this SOW are listed below. The Contractor shall be guided by the publications to the extent necessary to accomplish requirements in this SOW. The forms listed in this section are not all-inclusive and merely represent a range of forms that may be used by the Contractor.

NFPA 1 Fire Prevention Code

NFPA 51B Standard for Fire Prevention During Welding, Cutting, and Other Hot Work

NFPA 70 National Electrical Code

NRCA 5TH edition National Roofing Contractors Association (5th addition publication)

SMACNA 5TH edition Sheet-Metal and Air-Conditioning National Association (5th addition publication)

3 SUMMARY OF SERVICES

Work under this task order includes, furnish and install specified roofing and related components to the specified roofs by the roofing contractor, disconnection and re-connection of mechanical equipment by mechanical subcontractor, lightning protection system disconnection and re-installation including required components to ensure compliance with Owner and fire code certification requirements by lightning protection subcontractor.

A “turn-key” approach is required with the “accountability” for technical design, specifications, project quality control, 100% on-site installation supervision, and one-source manufacture (material and labor) “performance warranty” for a “15-year” water-tight roof system. The roof design criteria shall follow N.R.C.A. 5th edition, SMACNA 5th edition, FM Global 4450, 4470, 1-28 and 1-29 performance standards.

3.1 COMMON ROOF SECTION REPLACEMENT REQUIREMENTS

3.1.1 MECHANICAL/ELECTRICAL WORK

Roofing work includes disconnection and reconnection of mechanical equipment by mechanical subcontractor, lightning protection system disconnection and re-installation including required component upgrades to ensure compliance with NIH and fire code certification requirements by a lightning protection subcontractor. All electrical work shall be performed by licensed electrical subcontractor.

3.1.2 PROTECTION OF ROOFS

The Contractor shall protect existing roof systems by placing temporary plywood walkways in areas of access.

3.1.3 ROOF SYSTEM REQUIREMENTS

A) The Contractor shall develop a solvent free cold process built-up roof specification or appropriate roofing system that addresses existing conditions and projections. All materials utilized for the performance of work under this contract shall be solvent free unless prior written approval is obtained from the PO and the Division of Safety.

B) Low-sloped roofs shall be replaced with a solvent free cold process with a minimum four (4) ply built-up roof assembly.

1. Base sheet and three (3) ply configuration with minimum thirty (30) pound plies or heaver.

2. Graveled and flood coated where crane access is available

3. Modified bitumen cap sheet is permitted in lieu of gravel in non-accessible areas for crane access C) Sloped roofs shall be replaced with material to match existing.

D) All roofing applications shall be in accordance with specifications and details by the roofing system manufacturer, National Roofing Contractor’s Association (NRCA) and industry standards.

E) Contractor shall verify existing roof construction and square footage.

F) All material loading shall be performed after facility work hours or on weekends and includes crane work or use of interior elevators. Material loading schedules shall be coordinated with and approved by the PO.

3.1.4 PREPARATION

A) Prepare the roof substrate prior to installing the new roof system.

B) Replace or repair existing defective decking per approved option.

C) Replace or repair existing defective wood blocking per approved option.

D) Remove and dispose of obsolete rooftop curbs, pitch pockets and miscellaneous penetrations.

1. Install new roof decking or metal plating over opening.

2. Install one-eighth (1/8) inch steel plate over openings less than two feet by two feet (2’x2’) and one-quarter (1/4) inch steel plate over openings larger than two feet by two feet (2’x2’).

3. Lap plate over decking a minimum of six (6) inches on all sides.

4. Mechanically attach plating to decking a minimum of twelve (12) inches on center.

5. Owner (PO) shall identify items to be removed.

E) Raise existing roof curbs and plumbing vent stacks to a minimum of eight (8”) inches above the new roof surface.

F) Raise existing through wall metal counterflashings as needed to accommodate new roof heights and provide minimum 8 inch base flashing height requirements. Work includes masonry wall repairs as needed.

G) Rework existing roof drain bowl assemblies.

1. Replace broken roof drain accessories including clamping rings, clamps, bolts and strainers at roof drain bowl locations. Replace broken flashing ring and strainers with new cast iron roof drain rings and strainers.

H) Provide additional roof drainage as needed to ensure proper drainage on all roof areas contained within raised perimeters.

1. Install additional overflow drains, scuppers and gutters as required.

2. Work shall include plumbing connections.

I) Rework and upgrade existing skylight gutters as directed at the pre-bid walk.

3.1.5 ROOF DRAINS

The roofing Contractor is responsible for ensuring all roof drains included in the specified roof replacement work are free flowing. Flush drains to verify free flowing prior to the project start and at the project completion. Contractor shall notify Owner if roof drains are found slow flowing or inoperative prior to the project start.

3.1.6 SHEET METAL

A) Fabricate and install all sheet metal details per NRCA, Sheet Metal and Air-Conditioning Contractors National Association (SMACNA) and roofing system manufacturer’s requirements and standards.

B) Install new metal flashing to match existing sheet metal type.

C) The minimum requirements for sheet metal work material are twenty-four (24) gauge G-90

Kynar Pre-finished Steel, 0.040” Aluminum (mill finished, pre-finished or anodized), twenty-four (24) gauge stainless steel (2D finish), or sixteen (16) ounce copper.

D) Install the following new sheet metal flashing details using stainless steel.

1. Install new pre-engineered metal roof edge fascia or metal coping cap at outside perimeter edges.

2. Install metal extender fascia as required.

3. Install new pre-engineered metal counterflashing system.

4. Cut-in new reglet joints as required.

5. Reuse existing 2-piece metal counterflashing receiver when feasible. Replace defective or damaged receiver. Install new counterflashing to match existing receiver metal type.

6. Raise existing through wall metal counterflashings where needed to accommodate base flashing height requirements.

7. Install expansion joint metal cover.

8. Install metal sleeves with storm collars.

9. Install pitch pockets with storm collars.

10. Install gravel guards at roof drain locations.

E) Install new lead flashings at plumbing stack locations.

F) Install slip metal counter flashing detail at non-removable unit locations.

G) Install miscellaneous metal flashings and related accessories.

3.1.7 LIGHTNING PROTECTION

A) Temporarily remove existing lightning protection system as needed to accommodate the new roof installation. Reinstall lightning protection components in same location removed. Furnish and install anti-impalement balls on lightning rods while working near the components.

1. Disconnection and re-installation shall be performed by a licensed lightning protection subcontractor

2. Prior to removal: Verify operational condition of existing system to establish base line continuity

3. Lightning protection system shall be compliant with current code

B) Reinstall lightning protection system in same location removed. Install new wood blocking and pitch pans at through deck entry points. Replace defective components.

1. Installer qualifications: Engage an experienced installer who is NRTL listed or who is certified by Lightning Protection Institute (LPI) as a Master Installer/Designer.

2. Provide LPI certification of system prior to project start and upon project completion.

3.1.8 CONCRETE WALKWAY PAVERS

Reinstall concrete walkway pavers in same location as originally removed.

3.1.9 WALKWAY PADS

Install walkway pads where needed at access ladders, doors and hatches.

3.1.10 WOOD SLEEPERS

A) Install new pressure treated wood sleepers with walk pads at existing wood sleeper and conduit/pipe locations. Sleepers to be sized to support conduit /pipe/equipment. Secure and flash existing pipe supports.

B) Install and secure new wood blocking and tapered cedar strips over top side of existing masonry wall coping stones to flush top side of coping and accommodate attachment of the new metal coping cap system.

C) Install pressure treated wood blocking as required to match new insulation heights at wall junctions, roof edges, and penetrations and as indicated on detail drawings.

D) Install and secure preformed 45-degree pressure-treated wood cants at all horizontal / vertical interfaces.

3.1.11 WARRANTY

The One Source Manufacturer’s Warranty provided by the Contractor shall include a pre-paid warranty for a minimum of fifteen (15) years from the completion of replacement.

3.2 SHAKE SHINGLE ROOF SYSTEM

3.2.1 SCOPE OF WORK

A) All roofing applications shall be in accordance with specifications and details the NRCA and per established standards of the National Wood Shake Association.

B) Remove and dispose of all exiting wood shake shingles from roof.

C) Replace existing gutter and downspout assembly.

D) Install new wood shake shingles roofing system.

3.2.2 PREPARATION

Do not proceed with application of shingles or shakes until all surfaces are dry, free of all debris and protruding nails, and properly supported for shingle nailing and application.

3.2.3 ROOF INSTALLATION

3.2.3.1 INSTALLING CONCEALED FLASHINGS

A) Apply the flashing manufacturer's primer over all masonry wall surfaces (if any), before installing flashing. Lap edges and ends a minimum of six (6”) inches. Press flashing into place.

Cut out and patch all blisters. Roll edges and ends to insure complete adhesion.

B) Eaves: Unless shown otherwise on the drawings extend the flashing from the roof edge to a line a minimum of two (2’) feet beyond the interior face of the building wall.

C) Valleys, Hips and Ridges: Install the flashing centered on the valley, hip and ridge so that the flashing sheet extends a minimum of eighteen (18”) inches on each side of the center line.

D) Chimneys, Intersecting Walls, and Curbs: Install eighteen (18”) inch wide concealed flashing.

Extend the flashing one (1’) foot onto the roof surface and six (6”) inches up the vertical surface.

3.2.3.2 INSTALLING SHAKES

A) Start shakes at eaves with a starter course so that the first course of shakes are doubled. Set the first and starter course of shakes so they project beyond the metal drip edge one inch.

B) Space the shakes one-half (1/2”) inch apart from adjacent shakes.

C) Offset joints in adjacent courses at least one and one-half (1-1/2) inches.

D) After applying each course of shakes, apply an eighteen (18”) inch wide strip of felt underlayment so that it laps the top of the shakes and extends onto the roof deck. Set the bottom edge of the underlayment sixteen (16”) inches up from the butt for eighteen (18”) inches shakes and twenty (20”) inches up from the butt for twenty-four (24”) inch shakes.

3.2.3.3 SHAKE WEATHER EXPOSURE

A) Eighteen (18”) inch shakes: Eight (8”) inch exposure.

B) Twenty-four (24”) inch shakes: Ten (10”) inch exposure.

3.2.3.4 HIP AND RIDGE SHAKES

A) Start shakes at hips and ridges with a starter course.

B) Miter cut the shakes so that they can be installed with an alternate overlap between courses.

3.2.3.5 VALLEYS

A) Lay shakes over the metal valley flashing seven (7”) inches. Lay the shakes so that the exposed portion of the valley at the top is five (5”) inches wide on each side of the valley center line and increases in width one-eighth (1/8”) inch per foot toward the eaves.

B) Do not break joints into the valley, or lay shakes with the grain parallel with the centerline of valley.

3.2.3.6 BASE FLASHING

A) Interlace shakes with the base flashing.

B) Lap the shakes a minimum of five (5”) inches over the base flashing.

3.2.3.7 NAILING SHAKES

A) Secure each shake with two (2) nails. Place each nail one (1”) inch from each edge, and one (1”) or two (2”) inches above the butt line of the next course.

B) Drive nails flush without driving the nail heads into the shakes as crushing the wood.

3.2.4 METAL FABRICATION

Where practicable, form and fabricate sheet metal work in the factory or shop. Produce bends and profiles accurately to the indicated shapes. Where not indicated or specified, follow the applicable requirements of the reference standards listed in SMACNA.

3.2.4.1 INSTALLING BASE FLASHING

A) Form the base flashing from individual pieces nine (9”) inches long. Extend the base flashing onto the roof surface five (5”) inches and up beneath cap flashings a minimum of three (3”) inches

B) Lace the base flashing in with the shingles. Set each piece one-half (1/2”) inch up from the butt of the shingles. Nail the flashing to the roof surfaces only, with two (2) nails along the concealed top edge.

3.2.4.2 INSTALLING VALLEY FLASHING

A) Install in lengths not to exceed ten feet (10’). Lap ends a minimum of eight (8”) inches and nail on the concealed top edge only.

B) The exposed portion of the valley must be five (5”) inches wide at the top and increase in width one-eighth (1/8”) inch per foot toward the eaves. The concealed portion of the valley must extend five (5”) inches beneath the shingles.

C) Terminate the concealed edges in a one-half (1/2”) inch fold and secure two (2’) feet on center with two (2”) inch wide cleats.

3.2.4.3 INSTALLING EAVE AND RAKE FLASHING

A) Install in lengths not to exceed ten (10’) feet. Lap ends a minimum of three (3”) inches B) At eaves install the flashing under the fifteen (15 lbs) pound felt. At rakes install the flashing over the fifteen (15 lbs) pound felt.

C) Secure the flashing to the roof deck with nails spaced eight (8”) inches on center.

3.2.4.4 DOOR AND WINDOW FLASHING

Install the flashing in one continuous length from side to side.

3.2.5 GUTTER AND DOWNSPOUT INSTALLATION

A) Unless shown or specified otherwise, install the gutter system in accordance with the manufacturer's installation instructions.

B) Secure the fascia cleat to the fascia board with aluminum nails six (6”) inches on center.

C) Secure the fascia cleat to the roof deck with aluminum nails six (6”) inches on center.

D) Trim the top front and back edges of one end of each gutter section so the sections will overlap each other two (2”) inches and nest snugly together. Before joining sections together, apply sealant between the mating surfaces.

E) Install gutter brackets three (3’) feet on center.

F) Lock the front of the bracket to the gutter edge and secure the other end to the fascia board with aluminum screws.

G) Install gutter end pieces, mitered corners, and drop tubes. Apply sealant between mating surfaces and secure with pop rivets.

H) Install downspouts with end joints that telescope a minimum of one and one-half (1-1/2”) inches.

I) Install necessary offsets and elbows.

J) Install a minimum of two (2) straps at each downspout section. Fasten downspouts to straps with pop rivets.

K) Secure straps to masonry or concrete wall with machine bolts in lead shields.

3.3 COLD APPLIED BUILD-UP ROOFING SYSTEM WITH AGGREGATE SURFACING

3.3.1 SCOPE OF WORK

Supply all labor, transportation, material, apparatus, tools, and permits necessary for removal of the existing roof membrane system and installation of a new cold applied build-up roofing system with aggregate surfacing.

3.3.2 REMOVAL

A) Complete removal of existing roofing systems including roof ballast, field membrane, flashing membrane, metal flashings, insulation, wood blocking and accessories. Remove existing roofing system down to the roof decking or existing vapor retarder system.

B) Existing intact vapor retarder membrane on concrete decking shall remain. Remove loose, delaminated, blistered or otherwise defective vapor retarder membrane.

C) Replace or repair delaminated or defective vapor retarder membrane as specified. Contractor shall include costs for minor repairs to existing membrane.

D) Remove and store existing concrete walkway pavers for reuse.

3.3.3 DAMAGED MATERIALS

A) Replace removed loose, delaminated, blistered or otherwise defective existing vapor retarder membrane on concrete roof decking.

B) Repair with new Bituthene® 3000 Self-adhesive, rubberized asphalt/polyethylene waterproofing membrane by Grace Construction Products. Install membrane per manufacturer’s specifications

3.3.4 VAPOR RETARDER MEMBRANE PREPARATION

A) Prepare the vapor retarder membrane surfaces prior to installation of the new roof insulation system.

1. Sweep roof substrate clean.

2. Clean the Grace Roofing Membrane (GRM) surface with a high-pressure power wash of at least two-thousand (2,000 lbs) pounds per square inch (psi). Allow membrane surface to dry prior to priming.

3. Prime GRM surface with water based asphalt primer. Install primer at rate of one-hundred fifty (150 sq ft) to two-hundred fifty (250 sq ft) square feet per gallon. Do not over-prime.

Coverage will vary depending upon surface application and conditions. Allow drying.

3.3.5 INSULATION

A) Install new roof insulation system.

B) Install new polyisocyanurate insulation system to match existing insulation thickness. Install new tapered polyisocyanurate insulation system when existing roof slope is less that one-quarter (1/4”) inch.

C) Mechanically attach insulation layers to roof decking using appropriate fastener system or fully adhere using solvent free insulation adhesive.

D) Install four feet by four feet (4’x4’) tapered insulation sumps at roof drain locations and two feet by two feet (2’x2’) tapered insulation sumps at scupper locations (excluding overflow roof drains and scuppers).

E) Install adhered tapered insulation saddles or crickets to promote positive drainage along valley lines between roof drains and scuppers, along walls, at high side of roof curbs and as to be instructed at Pre-Job Walk.

1. Tapered insulation saddle and cricket slope shall equal a minimum of twice the roof slope.

2. Contractor is responsible for the elimination of ponding water along valley lines.

F) Install adhered coverboard layer over installed insulation system.

G) Install one-half (1/2”) inch thick, six (6) sided asphalt coated, high-density coverboard.

H) Install adhered tapered edge strips where blocking height exceeds insulation height.

3.3.5.1 INSULATION ADHESIVE APPLICATION

A) Apply adhered insulation system in solvent free insulation adhesive in accordance with manufacturer’s specifications. Decrease field-of-the-roof adhesive spacing between ribbons (rows) in perimeters and corners as defined in Factory Mutual (FM) Loss Prevention Data Sheet 1-29 and noted below (round down to a dimension that is practical with respect to board size and application):

1. In the roof perimeter, not more that sixty percent (60%) of the field-of-the-roof adhesive ribbon spacing between rows or area.

2. In the roof corners, not more that forty percent (40%) of the field-of-the-roof adhesive ribbon spacing between rows or area.

B) Stagger insulation board joints a minimum of twelve (12”) inches in both directions from joints of the previous insulation layer.

C) Walk boards into adhesive immediately after placement to achieve solid contact.

3.3.5.2 MECHANICALLY ATTACHED INSULATION

A) Install rosin felt over roof decking. Secure felt to roof decking as needed to hold in place.

B) Lay out polyisocyanurate insulation.

C) Install four feet by four feet (4’x4’) tapered insulation sumps at roof drain locations and two feet by two feet (2’x2’) tapered insulation sumps at scupper locations (excluding overflow roof drains and scuppers).

D) Mechanically attach insulation at a minimum rate of one (1) fastener per every two (2 sq ft) square feet. Enhance perimeter edge and corner fastener density by fifty percent (50%) along roof perimeters and one-hundred percent (100%) at roof corners. The width of the roof corner sand perimeters is defined as the smaller of one-tenth (0.1) times the building lesser plan dimension or four-tenths (0.4) times the building eave height.

3.3.6 ROOFING SYSTEM INSTALLATION

A) Install base and three (3) ply cold applied built-up roofing system with aggregate surfacing, elastomeric flashing and related accessories.

B) Install roofing plies to roof and all wall, curb, and projection bases in full application of roofing system manufacturer’s standard asphalt-based, solvent free cold-applied adhesive.

1. Immediately after ply installation, broom and/or roll ply sheet.

C) Install base ply.

1. Install one layer of American Society for Testing and Materials (ASTM) D 4601, Type II trilaminate reinforced felts in full application of solvent free adhesive.

2. Shingle plies in direction to shed water.

D) Install top ply felts over base ply.

1. Install three (3) plies of ASTM D 4601, Type II trilaminate reinforced felts in full application of solvent free adhesive.

2. Shingle plies in direction to shed water.

3. Back nail roofing plies to wood cants as specified.

E) Install lead flashings.

1. Install new lead flashings at roof drain and plumbing stack locations. Strip-in metal flanges with trilaminate reinforced base ply felts in full application of solvent free, cold applied adhesive.

F) Install Chlorosulfonated Polyethylene Elastomeric (CSPE) base flashings as specified in manufacturer’s general flashing requirements.

1. All flashings shall extend a minimum of eight (8”) inches above roof level unless previously accepted by Owner’s representative.

2. Install CSPE Elastomeric Flashing in solvent free elastomeric roof mastic.

3. Strip-in flashing vertical laps and lower edge of flashing to roof surface with three (3) course application of vinyl coated, woven glass mesh reinforcing membrane and solvent free elastomeric roof mastic.

4. Secure top edge of flashing membrane with metal termination bar. Seal termination bar with asphalt mastic and reinforcing membrane as required to keep flashing system watertight.

3.3.7 AGGREGATE SURFACING

A) Prior to application of surface treatment system, Contractor shall inspect roof with PO.

B) Prior to application of flood coat, Contractor shall clean and prime roof surface areas that have become contaminated with dirt and/or debris. Prime areas with water base asphalt primer.

C) Over entire roof surface brush or spray-apply uniform and continuous flood coat of solvent free, cold applied surfacing adhesive.

D) Immediately broadcast minimum four-hundred (400 lbs) pounds per one-hundred (100 sq ft) square feet of new, clean roofing gravel (Texas #7, Architectural/white). Cover flood coat material completely.

3.3.8 REFLECTIVE ALUMINUM COATING SYSTEM

A) Install volatile-organic compound (VOC) compliant Reflective Aluminum Coating System over exposed CSPE flashing surfaces.

B) Upon completion of roof system installation, roofing Contractor shall inspect new roof system with Owners (PO) representative.

C) Clean flashing surface of dirt and debris and repair all deficiencies prior to the application of the reflective coating. Area to be coated must have a clean, sound, and dry surface.

D) Allow roof mastics and cold process adhesives a minimum of thirty (30) days to cure before applying coating.

E) Prime all exposed roof mastic and cold adhesive on flashing and roof membrane surfaces.

Prime areas with Kilz Water Based Latex Primer per manufacturer’s specifications. Allow primer to dry.

F) Apply reflective aluminum coating in accordance with manufacturer’s specifications.

3.4 COLD APPLIED HYBRID MODIFIED BITUMEN ROOFING SYSTEM WITH REFLECTIVE COATING

3.4.1 SCOPE OF WORK

Supply all labor, transportation, material, apparatus, tools, and permits necessary for removal of the existing roof membrane system and installation of a new cold applied hybrid modified bitumen roofing system with reflective coating.

3.4.2 REMOVAL

A) Complete removal of existing roofing systems including roof ballast, field membrane, flashing membrane, metal flashings, insulation, wood blocking and accessories. Remove existing roofing system down to the roof decking or existing vapor retarder system.

B) Existing intact vapor retarder membrane on concrete decking shall remain. Remove loose, delaminated, blistered or otherwise defective vapor retarder membrane.

C) Replace or repair delaminated or defective vapor retarder membrane as specified. Contractor shall include costs for minor repairs to existing membrane.

D) Remove and store existing concrete walkway pavers for reuse.

3.4.3 PREPARATION

A) Replace removed loose, delaminated, blistered or otherwise defective existing vapor retarder membrane on concrete roof decking.

B) Repair with new Bituthene® 3000 Self-adhesive, rubberized asphalt/polyethylene waterproofing membrane by Grace Construction Products. Install membrane per manufacturer’s specifications.

3.4.4 VAPOR RETARDER MEMBRANE

A) Prepare the vapor retarder membrane surfaces prior to installation of the new roof insulation system.

1. Sweep roof substrate clean.

2. Clean the GRM surface with a high-pressure power wash of at least two-thousand (2,000) psi. Allow membrane surface to dry prior to priming.

3. Prime GRM surface with water based asphalt primer. Install primer at rate of one-hundred fifty (150 sq ft) to two-hundred fifty (250 sq ft) square feet per gallon. Do not over-prime.

Coverage will vary depending upon surface application and conditions. Allow the primer to dry.

3.4.5 INSTALL NEW ROOF INSULATION SYSTEM

A) Install new polyisocyanurate insulation system to match existing insulation thickness. Install new tapered polyisocyanurate insulation system when existing roof slope is less than one-quarter (1/4”) inch.

1. Mechanically attach insulation layers to roof decking using appropriate fastener system or fully adhere using solvent free insulation adhesive.

B) Install four feet by four feet (4’x4’) tapered insulation sumps at roof drain locations and two feet by two feet (2’x2’) tapered insulation sumps at scupper locations (excluding overflow roof drains and scuppers).

1. Install adhered tapered insulation saddles or crickets to promote positive drainage along valley lines between roof drains and scuppers, along walls, and at high side of roof curbs

2. Tapered insulation saddle and cricket slope shall equal a minimum of twice the roof slope.

3. Contractor is responsible for the elimination of ponding water along valley lines.

C) Install adhered coverboard layer over installed insulation system.

1. Install one-half (1/2”) inch thick, six (6) sided asphalt coated, high-density coverboard.

D) Install adhered tapered edge strips where blocking height exceeds insulation height.

3.4.6 INSULATION ADHESIVE APPLICATION

A) Apply adhered insulation system in solvent free insulation adhesive in accordance with manufacturer’s specifications. Decrease field-of-the-roof adhesive spacing between ribbons (rows) in perimeters and corners as defined in FM Loss Prevention Data Sheet 1-29 and noted below (round down to a dimension that is practical with respect to board size and application):

1. In the roof perimeter, not more than sixty percent (60%) of the field-of-the-roof adhesive ribbon spacing between rows or area.

2. In the roof corners, not more that forty percent (40%) of the field-of-the-roof adhesive ribbon spacing between rows or area.

B) Stagger insulation board joints a minimum of twelve (12”) inches in both directions from joints of the previous insulation layer.

C) Walk boards into adhesive immediately after placement to achieve solid contact.

3.4.7 MECHANICALLY ATTACHED INSULATION APPLICATION

A) Install rosin felt over roof decking. Secure felt to roof decking as needed to hold in place.

B) Lay out polyisocyanurate insulation.

C) Install four feet by four feet (4’x4’) tapered insulation sumps at roof drain locations and two feet by two feet (2’x2’) tapered insulation sumps at scupper locations (excluding overflow roof drains and scuppers).

D) Mechanically attach insulation at a minimum rate of one (1) fastener per every two (2 sq ft) square feet. Enhance perimeter edge and corner fastener density by fifty percent (50%) along roof perimeters and one-hundred percent (100%) at roof corners. The width of the roof corners and perimeters is defined as the smaller of one-tenth (0.1) times the building lesser plan dimension or four-tenths (0.4) times the building eave height.

3.4.8 COLD APPLIED HYBRID MODIFIED BITUMEN ROOFING SYSTEM

A) Install a cold applied hybrid modified bitumen roofing system including granule surfaced modified bitumen cap sheet, elastomeric flashings, reflective roof surface coating and related accessories.

B) Install roofing plies to roof and all wall, curb, and projection bases in full application of roofing system manufacturer’s standard asphalt-based, solvent free cold-applied adhesive.

C) Immediately after ply installation, broom and/or roll ply sheet.

3.4.8.1 INSTALL BASE PLIES

A) Install three (3) plies of ASTM D 4601, Type II trilaminate reinforced felts in full application of solvent free, cold applied.

B) Shingle plies in direction to shed water.

C) Back nail roofing plies to wood cants as specified.

3.4.8.2 INSTALL LEAD FLASHINGS

Install new lead flashings at roof drain and plumbing stack locations. Strip-in metal flanges with trilaminate reinforced base ply felts in full application of solvent free, cold applied adhesive.

3.4.8.3 INSTALL CAP SHEET

A) Install granule surfaced modified bitumen cap sheet over base plies and stripping plies B) Install one (1) layer of ASTM D 6163, Type III bilaminate reinforced felt (134 mils thick) in full application of solvent free, cold applied adhesive.

C) Shingle plies in direction to shed water D) Immediately broadcast and embed roofing granules into exposed adhesive along cap ply laps to provide a uniform finished appearance.

1. Apply granules to cover adhesive bead exposed at laps. Embed granules into the adhesive using a clean steel roller.

2. Remove excess granules from roof.

3.4.8.4 INSTALL CSPE ELASTOMERIC BASE FLASHINGS

A) As specified in manufacturer’s general flashing requirements.

B) All flashings shall extend a minimum of eight (8”) inches above roof level unless previously accepted by Owner’s representative.

C) Install CSPE Elastomeric Flashing in solvent free elastomeric roof mastic.

D) Strip-in flashing vertical laps and lower edge of flashing to roof surface with three (3) course application of vinyl coated, woven glass mesh reinforcing membrane and solvent free elastomeric roof mastic.

E) Secure top edge of flashing membrane with metal termination bar. Seal termination bar with asphalt mastic and reinforcing membrane as required to keep flashing system watertight.

3.4.8.5 FABRICATE AND INSTALL ALL SHEET METAL DETAILS

A) Per NRCA, SMACNA and roofing system manufacturer’s requirements and standards.

B) Install new metal flashing to match existing sheet metal type.

C) The minimum requirements for sheet metal work material are twenty-four (24) gauge G-90

Kynar Pre-finished Steel, 0.040” Aluminum (mill finished, pre-finished or anodized), twenty-four (24) gauge stainless steel (2D finish) or sixteen (16 oz) ounce copper.

D) Install the following new sheet metal flashing details using stainless steel.

1. Install new pre-engineered metal roof edge fascia or metal coping cap at outside perimeter edges.

2. Install metal extender fascia as required.

3. Install new pre-engineered metal counterflashing system.

4. Cut-in new reglet joints as required.

5. Reuse existing two (2) piece metal counterflashing receiver when feasible. Replace defective or damaged receiver. Install new counterflashing to match existing receiver metal type.

6. Raise existing through wall metal counterflashings where needed to accommodate base flashing height requirements.

7. Install expansion joint metal cover.

8. Install metal sleeves with storm collars.

9. Install pitch pockets with storm collars.

10. Install gravel guards at roof drain locations.

E) Install new lead flashings at plumbing stack locations.

F) Install slip metal counter flashing detail at non-removable unit locations.

G) Install miscellaneous metal flashings and related accessories.

3.4.9 REFLECTIVE ALUMINUM COATING SYSTEM

A) Install VOC compliant Reflective Aluminum Coating System over entire roof and exposed CSPE flashing surfaces.

B) Upon completion of roof membrane installation, roofing Contractor shall inspect new roof system with Owners (PO) representative.

C) Clean roof surface of dirt and debris and repair all deficiencies prior to the application of the reflective coating. Area to be coated must be a clean, sound, and dry surface.

D) Allow roof mastics and cold process adhesives a minimum of thirty (30) days to cure before applying coating.

E) Prime all exposed roof mastic and cold adhesive on flashing and roof membrane surfaces.

Prime areas with Kilz Water Based Latex Primer per manufacturer’s specifications. Allow primer to dry.

F) Apply Reflective Aluminum Coating.

G) Apply coating in accordance with manufacturer’s specifications.

3.5 SINGLE PLY THERMOPLASTIC ROOFING SYSTEM

3.5.1 SCOPE OF WORK

A) Supply all labor, transportation, material, apparatus, tools, and permits necessary for removal of the existing roof system and replacement with a new Single Ply Thermoplastic Roofing System.

B) All roofing applications shall be in accordance with specifications and details by the roofing system manufacturer, NRCA and industry standards.

3.5.2 REMOVAL

A) Complete removal of existing roofing systems including roof ballast, field membrane, flashing membrane, metal flashings, insulation, wood blocking and accessories. Remove existing roofing system down to the roof decking or existing vapor retarder system.

B) Existing intact vapor retarder membrane on concrete decking shall remain. Remove loose, delaminated, blistered or otherwise defective vapor retarder membrane.

3.5.3 PREPARATION

A) Replace or repair delaminated or defective vapor retarder membrane as specified. Contractor shall include costs for minor repairs to existing membrane.

B) Remove and store existing concrete walkway pavers for reuse.

3.5.4 DAMAGED MATERIALS

A) Replace removed loose, delaminated, blistered or otherwise defective existing vapor retarder membrane on concrete roof decking.

B) Repair with new Bituthene® 3000 Self-adhesive, rubberized asphalt/polyethylene waterproofing membrane by Grace Construction Products. Install membrane per manufacturer’s specifications.

3.5.5 VAPOR RETARDER MEMBRANE PREPARATION

A) Prepare the vapor retarder membrane surfaces prior to installation of the new roof insulation system.

B) Sweep roof substrate clean.

C) Clean the GRM surface with a high-pressure power wash of at least two-thousand (2,000) psi.

Allow membrane surface to dry prior to priming.

D) Prime GRM surface with water based asphalt primer. Install primer at rate of one-hundred fifty (150 sq ft) to two-hundred fifty (250 sq ft) square feet per gallon. Do not over prime. Coverage will vary depending upon surface application and conditions. Allow the primer time for drying.

3.5.6 INSULATION

A) Install new roof insulation system.

B) Install new polyisocyanurate insulation system to match existing insulation thickness. Install new tapered polyisocyanurate insulation system when existing roof slope is less than one-quarter (1/4”) inch.

1. Mechanically attach insulation layers to roof decking using appropriate fastener system or fully adhere using solvent free insulation adhesive.

C) Install four feet by four feet (4’x4’) tapered insulation sumps at roof drain locations and two feet by two feet (2’x2’) tapered insulation sumps at scupper locations (excluding overflow roof drains and scuppers).

D) Install adhered tapered insulation saddles or crickets to promote positive drainage along valley lines between roof drains and scuppers, along walls, at high side of roof curbs and as instructed at Pre-Job Walk.

1. Tapered insulation saddle and cricket slope shall equal a minimum of twice the roof slope.

2. Contractor is responsible for the elimination of ponding water along valley lines.

E) Install adhered tapered edge strips where blocking height exceeds insulation height.

3.5.6.1 INSULATION ADHESIVE APPLICATION

A) Apply adhered insulation system in solvent free insulation adhesive in accordance with manufacturer’s specifications. Decrease field-of-the-roof adhesive spacing between ribbons (rows) in perimeters and corners as defined in FM Loss Prevention Data Sheet 1-29 and noted below (round down to a dimension that is practical with respect to board size and application):

1. In the roof perimeter, not more than sixty percent (60%) of the field-of-the-roof adhesive ribbon spacing between rows or area.

2. In the roof corners, not more that forty percent (40%) of the field-of-the-roof adhesive ribbon spacing between rows or area.

B) Stagger insulation board joints a minimum of twelve (12”) inches in both directions from joints of the previous insulation layer.

C) Walk boards into adhesive immediately after placement to achieve solid contact.

3.5.6.2 MECHANICALLY ATTACHED INSULATION APPLICATION

A) Install rosin felt over roof decking. Secure felt to roof decking as needed to hold in place.

B) Lay out polyisocyanurate insulation.

C) Install four feet by four feet (4’x4’) tapered insulation sumps at roof drain locations and two feet by two feet (2’x2’) tapered insulation sumps at scupper locations (excluding overflow roof drains and scuppers).

D) Mechanically attach insulation at a minimum rate of one (1) fastener per every two (2 sq ft) square feet. Enhance perimeter edge and corner fastener density by fifty percent (50%) along roof perimeters and one-hundred percent (100%) at roof corners. The width of the roof corners and perimeters is defined as the smaller of one-tenth (0.1) times the building lesser plan dimension or four tenths (0.4) times the building eave height.

3.5.7 TRI-POLYMER ALLOY FLEECE-BACK SINGLE PLY ROOFING SYSTEM

A) Install fully adhered (60 mil) Tri-Polymer alloy fleece-back (TPA FB) Single Ply Roofing System including thermoplastic flashing and accessories.

B) Install TPA FB field membrane to substrate using manufacturer’s water based Single Ply Bonding Adhesive. Install membrane immediately into adhesive avoiding any air entrapment (Do not wait for adhesive to dry). Membrane must be rolled into wet adhesive. Apply pressure by roller or broom to assure positive contact. Mix water based Single Ply Bonding Adhesive thoroughly before use.

1. Do not allow adhesive to contaminate TPA membrane and flashing lap areas. Heat-weld overlap seams of TPA flashing and field membrane.

C) Install succeeding full rolls in same manner. Overlap seams minimum three (3”) inches.

D) Mechanically attach membrane sheets at roof perimeter and penetrations. Fasteners shall have two and three-eighths (2 3/8”) inch diameter barbed metal plates. Fasteners shall be placed a minimum of twelve (12”) inches on center and one and one-eighth (1-1/8”) inch from sheet edge in a true and straight.

3.5.7.1 MEMBRANE SEAMING

A) All edge surfaces to be seamed by hot air welding. Surfaces must be wiped with solvent using clean rags.

B) Heat-weld laps with approved welding equipment. Adjust welding speed and temperature base upon ambient conditions and material.

3.5.7.2 TPA FB MEMBRANE END LAPS

A) Abut end laps. Gap width between membrane sheets shall not exceed one-eighth (1/8”) inch.

B) Install six (6”) inch wide cover strip over end lap. Cut cover strip corners round. Heat-weld cover strip centered over end lap.

3.5.8 TPA FLASHING

A) Heat-weld a four inch (4”) round field cut TPA flashing membrane (unreinforced) centered over each T-joint on sixty (60) mil thick or greater membrane.

B) Install all new TPA flashing membrane details per manufacturer’s specifications, recommendations and details drawings.

C) All membrane flashings shall be installed concurrently with the roof membrane as the project progresses.

D) Membrane base flashings shall be fully adhered (60 mil) TPA Perimeter Sheet membrane (non-fleeced).

E) The flashing membrane shall be fully adhered to a dry, smooth solvent-resistant and compatible substrate using TPA Low VOC (LV) Single Ply Bonding Adhesive. Surfaces to receive adhesive must be clean, dry, and free from oil, grease, or other contaminants

F) Place the flashing membrane into the adhesive and pressure roll to assure positive contact.

G) Do not allow adhesive to contaminate TPA membrane and flashing lap areas. Heat-weld overlap seams of TPA flashing and field membrane.

H) Secure the top of the installed flashing membrane with a termination bar fastened six (6”) to eight (8”) inches on center and covered with metal counterflashing. Install butyl based sealant tape between wall and top edge of TPA flashing membrane prior to fastening.

I) Flash all pipes with TPA Pre-Fabricated Flashing Boots where possible. Field fabricate pipe flashing with TPA Flashing Membrane (unreinforced flashing) per manufacturer’s standard details when a pre-molded flashing is not feasible.

J) Fabricate all metal flashings with flanges using TPA Membrane Coated Metal. Heat-weld a six

(6) inch wide TPA cover strip to flashing membrane and coated metal flange.

K) Install new curb details.

L) Heat-weld all flashing laps with approved welding equipment.

3.5.9 ROOF DRAIN

Replace broken roof drain components with new cast iron roof drain rings, clamps and strainers at roof drain bowl locations.

3.5.10 SHEET METAL

A) Fabricate and install all sheet metal details per NRCA, SMACNA and roofing system manufacturer’s requirements and standards.

B) Install all new counterflashings and miscellaneous metal flashings.

1. All new sheet metal components (excluding TPA Membrane Coated Metal) shall match existing sheet metal type.

2. The minimum requirements for sheet metal work material are twenty-four (24) gauge G-90

Kynar Pre-finished Steel, 0.040” Aluminum (mill finished, pre-finished or anodized), twenty-four (24) gauge stainless steel (2D finish) or sixteen (16 oz.) ounce copper.

C) Install the following new sheet metal flashing details using stainless steel.

1. Install new pre-engineered metal roof edge fascia or metal coping cap at outside perimeter edges.

2. Install metal extender fascia as required.

3. Install new pre-engineered metal counterflashing system.

4. Cut-in new reglet joints as required.

5. Reuse existing two (2) piece metal counterflashing receiver when feasible. Replace defective or damaged receiver. Install new counterflashing to match existing receiver metal type.

6. Raise existing through wall metal counterflashings where needed to accommodate base flashing height requirements.

7. Install expansion joint metal cover.

8. Install metal sleeves with storm collars.

9. Install pitch pockets with storm collars.

D) Install new lead flashings at plumbing stack locations.

E) Install slip metal counter flashing detail at non-removable unit locations.

F) Install miscellaneous metal flashings and related accessories.

3.5.11 WALKWAY

A) Install…