Building_5201_ROOF_RECOVER_SOW__SPEC_rev_1.pdf

07550-1

US ARMY GARRISON

DEPARTMENT OF PUBLIC WORKS – REDSTONE ARSENAL

BUILDING 5201 ROOF RECOVER

GENERAL SCOPE OF WORK:

1. Wet areas of the roof are to be torn out and repaired per the specification.

2. Sweep and dispose of all loose gravel from existing roof system and then blow off any residual dust and debris. Spud any areas of excess asphalt that would inhibit the new cover board or insulation from adhering to the roof surface.

3. Apply an asphalt primer to roof surface and let dry. Apply a light glaze of Type IV asphalt to the existing roof surface prior to installing cover board and insulation to help fill in any cracks and crevices and then let dry.

4. Install ½” Securock cover board with type IV hot asphalt.

5. Install ½” per foot polyiso insulation crickets between each scupper, between scupper and wall, and the high side of all curbs with type IV hot asphalt on all applicable roof sections.

6. Install 80 mil SBS base sheet over cover board with Type IV asphalt.

7. Install 145 mil urethane modified cap sheet over base sheet with Type IV asphalt.

8. Install 80 mil SBS base flashing and 145 mil urethane cap flashing as per specifications.

Seal all vertical laps of flashing ply with a three-course application of aluminum trowel-grade mastic and fiberglass mesh. Coat all vertical flashing with the specified aluminum coating.

9. Provide walkway pads as shown on drawings spaced 18” apart with structural adhesive.

10. Install overflow scuppers of same number and size a minimum of 2” of above the primary scuppers on applicable roof sections.

11. All remaining rooftop equipment shall be scraped and sanded to remove any loose or flaking paint and rust. Apply a direct to metal rust inhibitive primer and then paint with two coats of exterior oil based bronze paint.

12. Install new kynar pre-manufactured coping cap (22 ga.), drip edge (24 ga.), and PermWall

1.5 series wall panels (24 ga.) from the primary membrane manufacturer. New wall panels should be installed whenever the wall height is greater than 24”. Install new 24 ga. kynar gutters, downspouts, and counterflashing out of flat stock metal from primary membrane manufacturer.

Area 1

1. Install ¼” tapered polyiso insulation with Type IV asphalt with ½” start to increase slope prior to installing cover board over existing roof system.

Area 2

1. HVAC Mechanical work to include the following:

a. Demo existing chiller, piping and components, including support frame

b. Demo chilled and hot water lines back off of roof

c. Provide temperature chilled water lines (PVC)

d. Reroute and replace chilled water and hot water lines when roof is complete.

Includes insulation and jacketing.

e. Roofers will provide four (4) 4’ long rigid curbs to support the new HVAC piping on the new roof.

2. Electrical Work to include the following:

a. Demo existing electrical conduit

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b. Reroute the power and control conduit and cables

3. Remove obsolete rooftop equipment no longer in service as identified by owner.

4. Extend downspout from the upper metal roof and carry it across the SE roof to the nearest scupper. Support the downspout with stands every 20’.

Area 3

1. Install 1/8” tapered polyiso insulation with Type IV asphalt with ½” start to increase slope prior to installing cover board over existing roof system.

2. Add elbow to downspout coming off the upper metal roof tie into nearest gutter.

3. Install ½” polyiso cricket in the dead area indicated on shop drawings to divert water to nearest gutter.

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GENERAL NOTES

1. CONTRACTOR SHALL VERIFY ALL CONDITIONS AND DIMENSIONS PRIOR TO ORDERING

ANY MATERIALS OR BEGINNING ANY DEMOLITION OR INSTALLATION. ANY

DISCREPANCIES SHALL PROMPTLY BE BROUGHT TO THE ATTENTION OF THE

CONTRACTING OFFICER'S REPRESENTATIVE.

2. CONTRACTOR SHALL COMPLY WITH ALL APPLICABLE CODES, LAWS, STANDARDS, AND

REGULATIONS AND FOLLOW ALL MANUFACTURER'S INSTRUCTIONS FOR THE PROPER

TRANSPORTATION, STORAGE AND INSTALLATION OF ALL MATERIALS.

3. CONTRACTOR SHALL REPAIR ALL DAMAGE TO ADJACENT EXISTING CONSTRUCTION

RESULTING FROM THE PERFORMANCE OF THIS WORK. REPAIRS SHALL MATCH

EXISTING IN TYPE AND QUALITY.

4. CONTRACTOR SHALL SMOOTH, FERTILIZE, SEED AND MULCH ADJACENT EXISTING

GRASS AREAS DAMAGED FROM THE PERFORMANCE OF THIS WORK. CONTRACTOR

SHALL GUARANTEE GROWTH AND DEVELOPMENT FOR ONE YEAR.

5. CONTRACTOR SHALL ARRANGE PROJECT SCHEDULE AND DAILY WORK HOURS IN

CONSULTATION WITH THE COR AND ARSENAL SECURITY PERSONNEL. NO BUILDING,

VEHICLE, OR EQUIPMENT SHALL REMAIN UNSECURED AFTER WORKING HOURS.

6. CONTRACTOR SHALL PROVIDE A SAFE AND CLEAN WORKING ENVIRONMENT, SHALL

REMOVE AND DISPOSE OF ALL DEBRIS TO APPROPRIATE LOCATIONS AND SHALL

PROVIDE FOR CONTINUAL VEHICULAR ACCESS TO ADJACENT PARKING AREAS

EXCEPT FOR BRIEF PREANNOUNCED PERIODS.

7. CONTRACTOR SHALL PROVIDE FOR THE PROMPT DAILY REMOVAL AND DISPOSAL OF

CONSTRUCTION DEBRIS TO APPROPRIATE LOCATIONS AND SHALL PROVIDE FOR A

SAFE AND CLEAN WORKING ENVIRONMENT.

8. CONTRACTOR IS RESPONSIBLE FOR FIELD LOCATING AND PROTECTING ALL UTILITIES.

ANY UTILITIES DAMAGED DURING CONSTRUCTION OPERATIONS SHALL BE THE

CONTRACTORS RESPONSIBILITY. DAMAGED UTILITIES SHALL BE REPAIRED

IMMEDIATELY AT CONTRACTOR'S EXPENSE.

9. DIMENSIONS ON DRAWING TAKE PRECEDENCE OVER SCALED DRAWING.

10. THE LAYDOWN YARD WILL BE ON THE EAST SIDE OF THE BUILDING INSIDE THE GATED

AREA OF THE PARKING LOT.

11. NO LIGHTNING PROTECTION SYSTEM IS REQUIRED BEFORE OR AFTER THE ROOFING

WORK IS DONE.

12. LADDER ACCESS FOR THIS PROJECT IS ACCEPTABLE. NO STAIR SCAFFOLDING IS

REQUIRED.

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US ARMY GARRISON

DEPARTMENT OF PUBLIC WORKS – REDSTONE ARSENAL

BUILDING 5201 ROOF RECOVER

PROJECT SPECIFICATION

1.1 SECTION INCLUDES

A. Hot Applied 2-Ply Asphalt Roofing

B. Edge Treatment and Roof Penetration Flashings

1.2 DESIGN / PERFORMANCE REQUIREMENTS

A. Perform work in accordance with all federal, state and local codes. It is the intent of this specification to install a long-term, quality modified bitumen roofing system that meets or exceeds all current NRCA guidelines as stated in the most recent edition of the NRCA Roofing and Waterproofing Manual.

1.3 SUBMITTALS

A. Product Data: Provide manufacturer's technical product data for each roofing product specified. Include data substantiating that materials comply with specified requirements.

B. Unexecuted Manufacturer's warranty.

C. Closeout Submittals: Provide manufacturer's maintenance instructions that include recommendations for periodic inspection and maintenance of all completed roofing work.

Provide product warranty executed by the manufacturer. Assist Owner in preparation and submittal of roof installation acceptance certification as may be necessary in connection with fire and extended coverage insurance on roofing and associated work.

D. Any material submitted as an equal to specified material must also be accompanied by a report signed and sealed by a professional engineer licensed in the state in which the installation is to take place. This report shall show that the submitted equal meets the Design and Performance criteria in this specification. Substitution requests submitted without licensed engineer approval will be rejected for non-conformance.

1.4 QUALITY ASSURANCE

A. Perform Work in accordance with NRCA Roofing and Waterproofing Manual.

B. Manufacturer Qualifications: Company specializing in manufacturing products specified with documented ISO 9001 certification and minimum of twelve years of documented experience and must not have been in Chapter 11 bankruptcy during the last five years.

C. Installer Qualifications: Company specializing in performing Work of this section with minimum five years documented experience and a certified Pre-Approved Garland Contractor.

D. Installer's Field Supervision: Maintain a full-time Supervisor/Foreman on job site during all phases of roofing work while roofing work is in progress.

E. Product Certification: Provide manufacturer's certification that materials are manufactured in the United States and conform to requirements specified herein, are chemically and

07550-5 physically compatible with each other, and are suitable for inclusion within the total roof system specified herein.

F. Source Limitations: Obtain all components of roof system from a single manufacturer.

Secondary products that are required shall be recommended and approved in writing by the roofing system Manufacturer. Upon request of the Architect or Owner, submit Manufacturer's written approval of secondary components in list form, signed by an authorized agent of the Manufacturer.

1.5 PRE-INSTALLATION MEETINGS

A. Convene minimum two weeks prior to commencing Work of this section.

B. Review installation procedures and coordination required with related Work.

C. Inspect and make notes of job conditions prior to installation:

1. Record minutes of the conference and provide copies to all parties present.

2. Identify all outstanding issues in writing designating the responsible party for follow-up action and the timetable for completion.

3. Installation of roofing system shall not begin until all outstanding issues are resolved to the satisfaction of the Architect.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Deliver and store products in manufacturer's unopened packaging with labels intact until ready for installation.

B. Store all roofing materials in a dry place, on pallets or raised platforms, out of direct exposure to the elements until time of application. Store materials at least 4 inches above ground level and covered with "breathable" tarpaulins.

C. Stored in accordance with the instructions of the manufacturer prior to their application or installation. Store roll goods on end on a clean flat surface. No wet or damaged materials will be used in the application.

D. Store at room temperature wherever possible, until immediately prior to installing the roll.

During winter, store materials in a heated location with a 50 degree F (10 degree C) minimum temperature, removed only as needed for immediate use. Keep materials away from open flame or welding sparks.

E. Avoid stockpiling of materials on roofs without first obtaining acceptance from the Architect/Engineer.

F. Adhesive storage shall be between the range of above 40 degree F (4 degree C) and below 80 degree F (27 degree C). Area of storage shall be constructed for flammable storage.

1.7 COORDINATION

A. Coordinate Work with installing associated metal flashings as work of this section proceeds.

1.8 PROJECT CONDITIONS

A. Owner will occupy portions of the building immediately below re-roofing area. Conduct re-roofing so Owner’s operations will not be disrupted. Provide Owner will no less than 72 hours’ notice of activities that may affect Owners’ operations.

B. Coordinate work activities daily with Owner so Owner can implement protective dust or water leakage covers over sensitive equipment or furnishings, shut down HVAC and fire-alarm or

07550-6 detection equipment if needed, and evacuate occupants from below the work area.

C. Protect building to be re-roofed, adjacent buildings, walkways, site improvements, exterior plantings, and landscaping from damage or soiling from re-roofing operations.

D. Maintain access to existing walkways, corridors, and other adjacent occupied or used facilities.

E. Weather Condition Limitations: Do not apply roofing membrane during inclement weather or when inclement weather is expected.

F. Proceed with roofing work only when existing and forecasted weather conditions will permit unit of work to be installed in accordance with manufacturer’s recommendations and warranty requirements.

1.9 MANUFACTURER’S INSPECTIONS

A. When the project is in progress, a full time employee of the roofing system manufacturer will provide the following:

1. Keep the Design Professional informed as to the progress and quality of the work as observed.

2. Provide job site inspections a minimum of three days a week.

3. Report to the Design Professional in writing any failure or refusal of the Contractor to correct unacceptable practices called to the Contractor's attention.

4. Confirm after completion that manufacturer has observed no applications procedures in conflict with the specifications other than those that may have been previously reported and corrected.

1.10 WARRANTY

A. Upon completion of the work, provide the Manufacturer's written and signed Edge to Edge NDL System Warranty, warranting that, if a leak develops in the roof during the term of this warranty, due either to defective material or defective workmanship by the installer, the manufacturer shall provide the Owner, at the Manufacturer's expense, with the labor and material necessary to return the defective area to a watertight condition including Garland Metal Components.

1. Warranty Period:

a. 40 years from date of acceptance with a mid-period inspection required from the manufacturer.

B. Installer is to guarantee all work against defects in materials and workmanship for a period indicated following final acceptance of the Work.

1. Warranty Period:

a. One (1) years from date of acceptance.

1.11 PRODUCT OPTIONS AND SUBSTITUTIONS

A. Any material submitted as an equal to specified material must also be accompanied by a report signed and sealed by a professional engineer licensed in the state in which the installation is to take place. This report shall show that the submitted equal meets the Design and Performance criteria in this specification. Substitution requests submitted without licensed engineer approval will be rejected for non-conformance.

B. Any deficiencies in performance, warranty terms or improper submittal procedure will constitute grounds for immediate rejection of substitution.

PART 2 PRODUCTS

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2.1 PRODUCTS, GENERAL

A. Basis of Design: Materials, manufacturer’s product designations, and/or manufacturer’s names specified herein shall be regarded as the minimum standard or quality required for work of this Section. Comply with all manufacturer and contractor/fabricator quality and performance criteria.

2.2 ACCEPTABLE MANUFACTURERS

A. Acceptable Manufacturer: Garland Company, Inc. (The), which is located at: 3800 E. 91st St.; Cleveland, OH 44105; Toll Free Tel: 800-321-9336; Tel: 216-641-7500; Fax: 216-641- 0633; Web:www.garlandco.com

B. Any item or materials submitted as a substitution to the manufacturer specified must comply in all respects as to the quality and performance of the brand name specified. The Architect/Owner shall be the sole judge as to whether or not an item submitted as a substitute is truly equal. Should the Contractor choose to submit a substitute product, he shall assume all monetary or other risk involved, should the Architect/Owner find the substitution unacceptable.

2.3 ROOFING MATERIALS PERFORMANCE REQUIREMENTS

A. Primer:

1. Non-fibered, quick drying, asphalt based roof primer. It re-saturates existing roofs to form a tough, elastic bonding surface.

a. Meets ASTM D 41

b. Flash Point ASTM D 93 100 deg. F

c. Non-Volatile ASTM D 2369 47.6%

B. Base (Ply) Sheet / Flashing Base (Ply) Sheet:

1. 80 mil SBS (Styrene-Butadiene-Styrene) rubber modified roofing base sheet reinforced with a dual fiberglass reinforced scrim, performance requirements according to ASTM D 5147.

a. Tensile Strength, ASTM D 5147

1) 2 in/min. @ 73.4 +/- 3.6 deg. F MD 225 lbf/in XD 225 lbf/in

2) 50 mm/min. @ 23 +/- 2 deg. C MD 39.0 kN/m XD 39.0 kN/m

b. Tear Strength, ASTM D 5147

1) 2 in/min. @ 73.4 +/- 3.6 deg. F MD 300 lbf XD 300 lbf

2) 50 mm/min. @ 23 +/- 2 deg. C MD 1335 N XD 1335 N

c. Elongation at Maximum Tensile, ASTM D5147

1) 2 in/min. @ 73.4 +/- 3.6 deg. F MD 4% XD 4%

2) 50 mm/min. @ 23 +/- 2 deg. C MD 4% XD 4%

d. Low Temperature Flexibility, ASTM D 5147, Passes -30 deg. F (-34.4 deg. C)

C. Thermoplastic Modified Cap (Ply) Sheet / Flashing Cap (Ply) Sheet:

1. 145 mil mineral surfaced, polyurethane modified roofing membrane with fire retardant characteristics, and dual fiberglass reinforced scrim. ASTM D 6163, Type III Grade G

a. Tensile Strength, ASTM D 5147

1) 2 in/min. @ 73.4 +/- 3.6 deg. F MD 205 lbf/in XD 215 lbf/in

2) 50 mm/min. @ 23 +/- 2 deg. C MD 36.0 kN/m XD 38 kN/m

b. Tear Strength, ASTM D 5147

1) 2 in/min. @ 73.4 +/- 3.6 deg. F MD 300 lbf XD 300 lbf

2) 50 mm/min. @ 23 +/- 2 deg. C MD 1334 N XD 1334 N

c. Elongation at Maximum Tensile, ASTM D 5147

1) 2 in/min. @ 73.4 +/- 3.6 deg. F MD 4.7% XD 5.0%

2) 50 mm/min. @ 23 +/- 2 deg. C MD 4.7% XD 5.0%

d. Low Temperature Flexibility, ASTM D 5147, Passes 0 deg. F (-18 deg. C)

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D. Interply Adhesive:

1. Generic Type IV Asphalt: Hot Bitumen, ASTM D 312, Type IV special steep asphalt having the following characteristics:

a. Softening Point 210 deg. F - 225 deg. F

b. Flash Point 500 deg. F

c. Penetration @ 77 deg. F 15-25 units

d. Ductility @ 77 deg. F 1.5 cm

E. Sealants:

1. Moisture-curing, single-component non-sag polyurethane sealant for use in expansion and control joints, reglets, precast panels, tiltup walls, metal curtain walls, copings, window and door perimeters, panel bedding and glazing details.

a. Tensile Strength, ASTM D 412 175 psi

b. Elongation, ASTM D 412 550%

c. 100% Modulus, ASTM C 719 65 psi

d. Adhesion-in-Peel, ASTM C 920 20 pli

F. Pitch Pocket Sealer: Two part, 100% solids, self-leveling, polyurethane sealant for filling pitch pans as recommended and furnished by the membrane manufacturer.

1. Durometer, ASTM D 2240: 40-50 Shore

2. Elongation, ASTM D 412: 250%

3. Tensile Strength, ASTM D 412: 200 @ 100 mil

G. Aluminum Coating: Non-fiered, asphalt-based aluminum roof paint.

1. Reflectance, 0.74 initial / 0.64 3 Year Aged

2. Emittance, 0.33 initial / 0.33 3 Year Aged

3. SRI, 77 initial / 60 3 Year Aged

H. Aluminum Mastic: Cold-applied, silver trowel-grade mastic designed for three course applications on flashings, patching and leak repair.

1. Density @ 77 deg F, ASTM D 1475 8.3lb./gal.

2. Non-Volatile, ASTM D 2369 70% min

3. Viscosity @ 77 deg F, 9 – 11 seconds

4. Reflectivity Typically 60%

5. Recycled Content, 5.19% Post Industrial

PART 3 EXECUTION

3.1 EXAMINATION

A. Do not begin installation until substrates have been properly prepared.

B. Inspect and approve the deck condition, slopes and fastener backing if applicable, parapet walls, expansion joints, roof drains, stack vents, vent outlets, nailers and surfaces and elements. Verify that all welds are good, that deck is in plane and that it is free from damage and deflection.

C. Verify that work penetrating the roof deck, or which may otherwise affect the roofing, has been properly completed.

D. If substrate preparation and other conditions are the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.

3.2 PREPARATION

A. General: Clean surfaces thoroughly prior to installation.

1. Prepare surfaces using the methods recommended by the manufacturer for achieving

07550-9 the best result for the substrate under the project conditions.

2. Roof surface to receive roofing system shall be smooth, clean, free from loose gravel, dirt and debris, dry and structurally sound.

3. Wherever necessary, all surfaces to receive roofing materials shall be power broom and vacuumed to remove debris and loose matter prior to starting work.

4. Do not apply roofing during inclement weather. Do not apply roofing membrane to damp, frozen, dirty, or dusty surfaces.

3.3 INSTALLATION – GENERAL

A. Install modified bitumen membranes and flashings in accordance with manufacturer's instructions and with the recommendations provided by the National Roofing Contractors Association's Roofing & Waterproofing Manual, the Asphalt Roofing Manufacturers Association, and applicable codes.

B. Insurance/Code Compliance: Where required by code, install and test the roofing system to comply with governing regulation and specified insurance requirements.

C. General: Avoid installation of modified bitumen membranes at temperatures lower than 40- 45 degrees F. When work at such temperatures unavoidable use the following precautions:

1. Take extra care during cold weather installation and when ambient temperatures are affected by wind or humidity, to ensure adequate bonding is achieved between the surfaces to be joined. Use extra care at material seam welds and where adhesion of the applied product to the appropriately prepared substrate as the substrate can be affected by such temperature constraints as well.

2. Unrolling of cold materials, under low ambient conditions must be avoided to prevent the likelihood of unnecessary stress cracking. Rolls must be at least 40 degrees F at the time of application. If the membrane roll becomes stiff or difficult to install, it must be replaced with roll from a heated storage area.

D. Coordinate installation of roofing system components so that insulation and roofing plies are not exposed to precipitation or left exposed overnight. Provide cut-offs at end of each day’s work to cover exposed ply sheets and insulation with two (2) plies of #15 organic roofing felt set in full moppings of bitumen and with joints and edges sealed with roofing cement.

Remove cut-offs immediately before resuming work.

E. Asphalt Bitumin Heating: Heat and apply bitumen in accordance with the Equiviscous Temperature (EVT) Method as recommended by National Roofing Contractors Association (NRCA). Do not raise temperature above minimum normal fluid-holding temperature necessary to obtain EVT (plus 5 at point of application) more than one (1) hour prior to time of application. Determine flash point, finished blowing temperature, EVT, and fire-safe handling temperature of bitumen either from information by manufacturer or suitable test. Do not exceed recommended temperature limits during bitumen heating. Do not heat to a temperature higher than twenty five degrees (25) below flash point. Discard bitumen that has been held at temperature exceeding Finished Blowing Temperature (FBT) for more than three (3) hours. Keep kettle lid closed except when adding bitumen.

F. Asphalt Bitumin Mopping Rate:

1. Interply Mopping: Apply bitumen at the rate of approximately twenty five (25) lb.(11.3kg) of bitumen per roof square.

2. Modified Membrane Mopping: Apply bitumen at the rate of approximately thirty (30) lb.(13.6kg) of bitumen per roof square.

G. Substrate Joint Penetrations: Prevent bitumen from penetrating substrate joints, entering building, or damaging roofing system components or adjacent building construction.

H. Apply roofing materials as specified by manufacturer’s instructions

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1. Keep roofing materials dry before and during application.

2. Do not permit phased construction.

3. Complete application of roofing plies, modified sheet and flashing in a continuous operation.

4. Begin and apply only as much roofing in one day as can be completed that same day.

I. Commence installation of the roofing system at the lowest point of the roof (or roof area), working up the slope toward the highest point. Lap sheets shingle fashion so as to constantly shed water

3.4 ROOFING DEMOLITON / REPAIR OF WET AREAS

A. A moisture survey was performed. Wet areas to be torn out and built up to roof level with polyisocyanurate.

B. Tear off all flashings and dispose off-site and install new as per specification.

3.5 ROOF RECOVER PREPARATION

A. Verify that existing substrate is dry before proceeding with installation of cover board.

1. Sweep and dispose of all loose gravel from existing roof system and then blow off any residual dust and debris. Spud any areas of excess asphalt that would inhibit the new cover board or insulation from adhering to the roof surface.

2. Repair blisters, ridges, buckles and other substrate irregularities from existing roofing membrane that would inhibit new recover boards from conforming to substrate.

B. After the surface has been properly cleaned apply a universal asphalt primer to the surface at a rate of ¼ - ½ gallon per square.

C. Apply a light glaze of Type IV asphalt to the existing roof surface prior to installing cover board and insulation to help fill in any cracks and crevices and then let dry.

D. Properly adhere ½” Securock cover board with Type IV asphalt.

E. Area 1 Roof: Install ¼” tapered polyiso insulation with Type IV asphalt with ½” start to increase slope prior to installing cover board over existing roof system.

F. Area 3 Roof: Install 1/8” tapered polyiso insulation with Type IV asphalt with ½” start to increase slope prior to installing cover board over existing roof system.

3.6 INSTALLATION HOT APPLIED ROOF SYSTEM

A. Base Sheet Installation:

1. Install base sheet in twenty five (25) lbs. per square of type IV hot asphalt shingled uniformly to achieve one or more plies over the entire prepared substrate. Shingle in direction of slope of roof to shed water on each area of roof. Do not step on base rolls until asphalt has cooled, fish mouths should be cut and patched.

2. Lap ply sheet ends 8 inches. Stagger end laps 12 inches minimum.

3. Once the roll is down, it must be in good contact with the cover board by lightly brooming to assure complete adhesion. It is important not to trap air under the membrane and to work out all air that may be trapped.

4. Extend plies 2 inches beyond top edges of cants at wall and roof projection and equipment bases.

5. Install base flashing ply to all perimeter and projection details after membrane application. Base flashings are to be constructed as one ply of modified base sheet and one ply of modified cap sheet.

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B. Modified Cap Sheet Installation:

1. Solidly bond the 145 mil urethane modified membrane to the base sheet with specified material at the rate of twenty five (25) to thirty (30) lbs. (11-13kg) per 100 square feet.

2. Roll must push a puddle of hot material in front of it with material slightly visible at all side laps. Exercise care during application to eliminate air entrapment under the membrane.

3. Apply pressure to all seams to ensure that the laps are solidly bonded to substrate.

4. Install subsequent rolls of modified membrane as above with a minimum of 4 inch

(101 mm) side laps and 8 inch (203 mm) end laps. Stagger the end laps. Apply membrane in the same direction as the previous layers but stagger the laps so they do not coincide with the laps of the base layers.

5. Apply hot bitumin no more than 5 feet (1.5 m) ahead of each roll being embedded.

6. Extend membrane 2 inches (50 mm) beyond top edge of all cants in full moppings of the specified hot bitumin.

7. Loose roofing granules should be immediately broadcast into the asphalt bleed-out.

C. Flashing Membrane Installation:

1. Seal curb, wall and parapet flashings with an application of mastic and mesh on a daily basis. Do not permit conditions to exist that will allow moisture to enter behind, around or under the roof or flashing membrane.

2. Adhere to the underlying base flashing base ply with specified hot bitumin. Nail off at a minimum of 8 inches (203 mm) o.c. from the finished roof at all vertical surfaces.

3. Solidly adhere the entire flashing base ply to the substrate.

4. Seal all vertical laps of flashing ply with a three-course application of aluminum trowel-grade mastic and fiberglass mesh.

5. Coat all vertical flashing with an aluminum coating at a rate of 0.75 gal/sq per coat.

Two coats are required.

6. Coordinate counter flashing, cap flashings, expansion joints, and similar work with modified bitumen roofing work.

D. Fibrous Cant Strips: Provide non-combustible 5” polyiso cant strips at all wall/curb detail treatments where angle changes are greater than 45 degrees. Cant may be set in approved cold adhesives, hot asphalt or mechanically attached with approved plates and fasteners.

E. Wood Blocking and Nailers:

1. Replace deteriorated wood blocking as necessary and install additional wood blocking to perimeter as called out in details.

2. Wood nailers should match the height of any insulation, providing a smooth and even transition between flashing and insulation areas.

3. Nailer lengths should be spaced with a minimum 1/8 inch gap for expansion and contraction between each length or change of direction.

4. Nailers and flashings should be fastened in accordance with Factory Mutual "Loss

Prevention Data Sheet 1- 49, Perimeter Flashing" and be designed to be capable of resisting a minimum force of 200 lbs/lineal foot in any direction.

F. Remove any obsolete rooftop equipment no longer in service as identified by owner.

G. Roof Walkway Pads: Provide walkway pads as shown on drawings spaced 18” apart.

Adhere pads with structural adhesive.

1. Trafgard Walkway Pads: 2’ x 6’ x ½”

H. All rooftop equipment shall be scraped and sanded to remove any loose or flaking paint and rust. Apply a direct to metal rust inhibitive primer and then paint with two coats of exterior oil based bronze paint.

I. Projections may need to be raised to the approved 8” minimum height. Contractor to verify

07550-12 prior to bidding on project. All items will be measured upon final completion.

J. Install overflow scuppers of same number and size a minimum of 2” of above the primary scuppers on applicable roof sections.

K. Pitch pans, Rain Collar 24 gauge stainless or 20oz (567gram) copper. All joints should be welded/soldered watertight. Only if Versa Line Flashing Detail can’t be used.

L. Plumbing stacks should be 4lb (1.8kg) sheet lead formed and rolled.

3.7 INSTALLATION EDGE TREATMENT AND ROOF PENETRATION FLASHINGS

A. Roof Edge With Gutter:

1. Inspect the nailer to assure proper attachment and configuration. Increase slope at metal edge by additional degree of slope in first board.

2. Run one ply over the edge. Assure coverage of all wood nailers. Fasten plies with ring shank nails at 8 inches (203 mm) o.c.

3. Install gutter and strapping.

4. Install continuous cleat and fasten at 6 inches (152 mm) o.c.

5. Prime top and bottom metal edge at a rate of 100 square feet per gallon and allow to dry.

6. Install new metal edge hooked to continuous cleat and set in bed of roof cement.

Fasten flange to wood nailer every 3 inches (76 mm) o.c. staggered.

7. Strip in flange with base flashing ply covering entire flange in bitumen with 6 inches

(152 mm) onto the field of the roof. Assure ply laps do not coincide with metal laps.

8. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) on to the field of the roof.

9. Install a bead polyurethane sealant along the mod-bit to metal edge to provide an extra layer of waterproofing.

10. No ponding water will be allowed along the roof edge with gutters.

11. edge with approved fasteners and neoprene washers at 8 inches (203 mm) o.c.

B. Equipment Support / Curb Detail-Air Handling Station / Exhaust Fan / Are Intake:

1. Minimum curb height is 8 inches (203 mm) above finished roof height. Prime vertical at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all field plies over cant a minimum of 2 inches (50 mm).

3. Install base flashing ply covering curb set in bitumen with 6 inches (152 mm) on to field of the roof.

4. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) on to the field of the roof. Attach top of membrane to top of curb and nail at 8 inches (203 mm) o.c. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

5. Install pre-manufactured cover. Fasten sides at 24 inches (609 mm) o.c. with fasteners and neoprene washers. Furnish all joint cover laps with butyl tape between metal covers.

6. Or Set equipment on neoprene pad and fasten as required by equipment manufacturer.

7. Or Install metal exhaust fan over the wood nailers and flashing to act as counterflashing. Fasten per manufacturer's recommendation.

8. Or install passive vent/air intake over the wood nailers and flashing to act as counterflashing. Fasten per manufacturer's recommendations.

C. Plumbing Stack:

1. Minimum stack height is 12 inches (609 mm).

2. Run roof system over the entire surface of the roof. Seal the base of the stack with elastomeric sealant.

3. Prime flange of new sleeve. Install properly sized sleeves set in 1/4 inch (6 mm) bed

07550-13 of roof cement.

4. Install base flashing ply in bitumen.

5. Install membrane in bitumen.

6. Caulk the intersection of the membrane with elastomeric sealant.

7. Turn sleeve a minimum of 1 inch (25 mm) down inside of stack.

D. Reglet Mounted Counterflashing:

1. Minimum flashing height is 8 inches (203 mm) above finished roof height. Maximum flashing height is 24 inches. Prime vertical wall at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all field plies over cant a minimum of 2 inches (50 mm).

3. Install base flashing ply covering wall set in bitumen with 6 inches (152 mm) on to field of the roof.

4. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

5. Apply butyl tape to wall behind flashing. Secure termination bar through flashing, butyl tape and into wall. Alternatively use caulk to replace the butyl tape.

6. Cut reglet in masonry one joint above flashing.

7. Secure reglet counterflashing with expansion fasteners and caulk reglet opening with a polyurethane sealant.

E. Scupper Through Wall:

1. Inspect the nailer to assure proper attachment and configuration.

2. Run one ply over nailer, into scupper hole and up flashing as in typical wall flashing detail. Assure coverage of all wood nailers.

3. Install a scupper box in a 1/4 inch (6 mm) bed of mastic. Assure all box seams are soldered and have a minimum 4 inch (101 mm) flange. Make sure all corners are closed and soldered. Prime scupper at a rate of 100 square feet per gallon and allow to dry.

4. Fasten flange of scupper box every 3 inches (76 mm) o.c. staggered.

5. Strip in flange of scupper box with base flashing ply covering entire area with 6 inch

(152 mm) overlap on to the field of the roof and wall flashing.

6. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all seams.

F. Scupper Through Wall (Overflow):

1. Inspect the nailer to assure proper attachment and configuration.

2. Run one ply over nailer up the overflow, into the scupper hole and up flashing as in typical wall flashing detail. Assure coverage of all wood nailers.

3. Install scupper box in a 1/4 inch (6 mm) bed of mastic. Assure all box seams are soldered and have a minimum 4 inch (101 mm) flange. Make sure all corners are closed and soldered. Prime scupper at a rate of 100 square feet per gallon and allow to dry.

4. Fasten flange of scupper box every 3 inches (76 mm) o.c. staggered.

5. Strip in flange scupper box with base flashing ply covering entire area with 6 inch (152

mm) overlap on to the field of the roof and wall flashing.

6. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all seams.

G. Coping Cap:

1. Minimum flashing height is 8 inches (203 mm) above finished roof height. Maximum flashing height is 24 inches (609 mm). Prime vertical wall at a rate of 100 square feet per gallon and allow to dry.

07550-14

2. Set cant in bitumen. Run all field plies over cant a minimum of 2 inches (50 mm).

3. Attach tapered board to top of wall.

4. Install base flashing ply covering entire wall and wrapped over top of wall and down face with 6 inches (152 mm) on to field of roof and set in cold asphalt. Nail membrane at 8 inches (203 mm) o.c.

5. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all seams and allow to cure and aluminize.

6. Install continuous cleat and fasten at 6 inches (152 mm) o.c. to outside wall.

7. Install new pre-manufactured metal coping cap hooked to continuous cleat.

8. Fasten inside cap 24 inches (609 mm) o.c. with approved fasteners and neoprene washers through slotted holes, which allow for expansion and contraction.

H. Pitch Pocket Umbrella:

1. Run all plies up to the penetration.

2. Place the pitch pocket over the penetration and prime all flanges.

3. Strip in flange of pitch pocket with one ply of base flashing ply. Extend 6 inches (152

mm) onto field of roof.

4. Install second layer of modified membrane extending 9 inches (228 mm) onto field of the roof.

5. Fill pitch pocket half full with non-shrink grout. Let this cure and top off with pourable sealant.

6. Caulk joint between roof system and pitch pocket with an elastomeric, asphaltic mastic.

7. Place a watershedding type bonnet over the top of the pitch pocket and clamp the top with a drawband collar. Caulk the upper edge of the band with a polyurethane elastomeric sealant.

8. All new pitch pans shall be no less than two (2") inches wider than any detail through them. Minimum height shall be three (3") inches.

I. Manufactured Wall Panel W/Modified Roof/Flashing (Slip Flashing):

1. Minimum flashing height is 8 inches (203 mm) above finished roof height. Prime vertical wall at a rate of 100 square feet per gallon and allow to dry.

2. Set cant in bitumen. Run all plies over cant a minimum of 2 inches (50 mm).

3. Install base flashing ply covering wall with 6 inches (152 mm) on to field of the roof.

4. Install a second ply of modified flashing ply in bitumen over the base flashing ply, 9 inches (228 mm) on to the field of the roof. Apply a three-course application of mastic and mesh at all vertical seams and allow to cure and aluminize.

5. Install manufacturer's standard hat channel into the top of the modified membrane to act as a termination bar.

6. Install hat channels at 24 inches (609 mm) o.c. vertically spaced up the wall.

7. Install the uppermost hat channel at the bottom edge of the coping cap. Insert rigid insulation between the hat channels. Place manufacturer's standard seam tape on top of all hat channels.

8. Fasten the first manufactured wall panel vertically plumb and fasten every ) inches (152 mm) o.c.

9. Install adjoining panels by engaging the opposing interlocking seam and fastening as described above.

10. Complete inside and outside corners by installing pre-fabricated corners or job site braking a full width panel to accommodate the corner, so that the sides engage the lock of the panels to the corner areas.

11. Trim excess seam tape and seam raw edges with manufacturer's recommended sealant.

12. Fasten slip flashing to existing coping cap with a waterproof rivet every 24 inches (609

mm) o.c. to act as a counterflashing over the manufactured wall panel.

07550-15

3.8 SHEET METAL FLASHING AND TRIM

A. Metal Work:

1. Install new kynar pre-manufactured coping cap (22 ga.), drip edge (24 ga.), and wall panels (24 ga.) from the primary membrane manufacturer. New wall panels should be installed whenever the wall height is greater than 24”. Install new 24 ga. kynar gutters, downspouts, and counterflashing out of flat stock metal from primary membrane manufacturer.

2. All metal work should be installed in accordance with the SMACNA "Architectural Sheet Metal Manual" or the NRCA Roofing Waterproofing manual.

3.9 PROTECTION

A. Provide traffic ways, erect barriers, fences, guards, rails, enclosures, chutes and the like to protect personnel, roofs and structures, vehicles and utilities.

B. Protect exposed surfaces of finished walls with tarps to prevent damage.

C. Plywood for traffic ways required for material movement over existing roofs shall be not less than 5/8 inch (16 mm) thick.

D. In addition to the plywood listed above, an underlayment of minimum 1/2 inch (13 mm) recover board is required on new roofing.

E. Special permission shall be obtained from the Manufacturer before any traffic shall be permitted over new roofing.

3.10 FIELD QUALITY CONTROL

A. Inspection: Provide manufacturer's field observations at start-up and at intervals of approximately 30 percent, 60 percent and 90 percent completion. Provide a final inspection upon completion of the Work.

1. Warranty shall be issued upon manufacturer's acceptance of the installation.

2. Field observations shall be performed by a Technical Representative employed full-time by the manufacturer and whose primary job description is to assist, inspect and approve membrane installations for the manufacturer.

3. Provide observation reports from the Technical Representative indicating procedures followed, weather conditions and any discrepancies found during inspection.

4. Provide a final report from the Technical Representative, certifying that the roofing system has been satisfactorily installed according to the project specifications, approved details and good general roofing practice.

3.11 CLEANING

A. Remove bitumen drippings from walls, windows, floors, ladders, and finished surfaces.

B. Repair or replace defaced or disfigured finishes caused by work of this section.

3.12 CONSTRUCTION WASTE MANAGEMENT

A. Remove and dispose of waste products generated during roofing procedures. Comply with requirements of authorities having jurisdiction.

3.13 FINAL INSPECTION

A. At completion of installation and associated work, meet with Contractor, Architect, installer, installer of associated work, Owner, roofing system manufacturer’s representative, and other representatives directly concerned with performance of roofing system.

07550-16

B. Inspect work and flashing of roof penetrations, walls, curbs and other equipment. List all items requiring correction or completion and furnish a copy of list to each party in attendance.

C. Repair or replace deteriorated or defective work found at time above inspection as required to a produce an installation which is free of damage and deterioration at time of Substantial Completion and according to warranty requirements.

D. Notify the Owner upon completion of corrections.

E. Following the final inspection, provide written notice of acceptance of the installation from the roofing system manufacturer.

F. Immediately correct roof leakage during construction. If the Contractor does not respond within twenty-four (24) hours, the Owner will exercise rights to correct the Work under the terms of the Conditions of the Contract.

3.14 DEMONSTRATION AND TRAINING

A. At a time and date agreed to by the Owner, instruct the Owner’s facility manager, or other representative designated by the Owner, on the following procedures:

1. Troubleshooting procedures.

2. Notification procedures for reporting leaks or other apparent roofing problems.

3. Maintenance.

4. The Owner’s obligations for maintaining the warranty in effect and force.

5. The Manufacturer’s obligations for maintaining the warranty in effect and force.

END OF SECTION