NYANG 174th PVC roof repair scope for base review 4-25-21.pdf

174th NYANG PVC Roof repair Specification Adhered PVC System

1.07 WARRANTIES

A. Applicator/Roofing Contractor 2 year Warranty

Applicator shall supply Owner with a separate workmanship warranty. In the event any work related to roofing, flashing, or metal is found to be within the Applicator warranty term, defective or otherwise not in accordance with Contract Documents, the Applicator shall repair that defect at no cost to the Owner.

Applicator's warranty obligation shall run directly to Owner, and a copy shall be sent to Sika Corporation.

B. Owner Responsibility

Owner shall notify both Sika Corporation and the Applicator of any leaks as they occur during the time period when both warranties are in effect.

1.08 WARRANTY DURATIONS

A. Applicator’s/Roofing Contractor’s Warranty shall be in effect for a 2 year duration.

PART 2 - PRODUCTS

2.01 GENERAL

A. Components of the roof system are to be products of Roofing System manufacturer as indicated on the

Detail Drawings and specified in the Contract Documents

B. Special consideration should be given to construction related moisture. An example is the significant amount of moisture generated when concrete floor slabs are poured after the roof has been installed. Sika Corporation is not responsible for damage to the insulation when exposed to construction related moisture.

C. Consult respective product data sheets for additional information.

2.02 MEMBRANE

A. Basis of Design Sika Sarnafil G 410 PVC roofing system B. Membrane shall conform to:

ASTM D4434 (latest version), "Standard for Polyvinyl Chloride Sheet Roofing". Classification: Type

II,.

1. NSF/ANSI Standard 347, “Sustainability Assessment for Single Ply Roofing Membranes”. Certification Level: Platinum.

2. The manufacture to guarantee that the membrane thickness meets or exceeds [the specified thickness] when tested according to ASTM D751

C. Sarnafil G410 thermoplastic membrane with fiberglass reinforcement and lacquer coating.

D. Thickness

1. Sarnafil G410-15, 60 mil (1.8 mm)

E. Color of Membrane to be selected from standard stock colors

1. White, Reflective Gray, Tan, Lead Grey, Patina Green, Evergreen, Copper Brown

2. Other

F. Typical Physical Properties (1)

Property

ASTM

Test

Method

ASTM Type II D-4434 Spec.

Requirement

Typical Results

Overall Thickness, mil D751 45 48 60 72 80 Thickness Over Scrim, mil -- 16 22 27 35 40 Reinforcing Material -- -- Fiberglass Fiberglass Fiberglass Fiberglass Breaking Strength, lbf (N) D751 55 (245) 60 (267) 80 (356) 100 (445) 110 (489) Elongation at Break, % M. D.1 & C.M.D.1

D751 250 & 220 250 & 220 250 & 220 250 & 220 250 & 220

Seam Strength, % of original2 D751 75 Pass Pass Pass Pass Retention of Properties After Heat Aging

D3045 -- -- -- -- --

Tensile Strength, % of original D751 90 Pass Pass Pass Pass Elongation, % of original D751 90 Pass Pass Pass Pass Tearing Resistance, lbf (N) D1004 10 (45) 15 (67) 17.5 (78) 20.5 (91) 22 (98) Low Temperature Bend, -40°F (-40°C)

D2136 Pass Pass Pass Pass Pass

Accelerated Weathering Test (Florescent Light UV exposure), Hours

G154 5,000 10,000 10,000 10,000 10,000

Cracking (7x magnification) -- None None None None None Discoloration (by observation) -- Negligible Negligible Negligible Negligible Negligible Crazing (7x magnification) -- None None None None None Linear Dimensional Change, % D1204 0.1 -0.02 -0.02 -0.01 -0.01 Weight Change After Immersion in Water, %

D570 ± 3.0 2.4 1.9 1.8 1.7

Static Puncture Resistance, lbf (kg) D5602 33 (15) Pass Pass Pass Pass Dynamic Puncture Resistance, ft-lbf (J) D5635 7.3 (10) Pass Pass Pass Pass

Recycled Content (10' & 5' sheet only) 9% Pre-Consumer / 1% Post-Consumer

* Results may differ based upon statistical variations depending upon mixing methods and equipment, temperature, application methods, test methods, actual site conditions, and curing conditions.

1 M.D. = Machine Direction, C.M.D. = Cross Machine Direction 2 Failure occurs through membrane rupture not seam failure.

2.03 FLASHING MATERIALS

A. Flashing

1. Sarnafil G410 Membrane

A fiberglass reinforced membrane adhered to approved substrates using Sarnacol adhesive.

B. Miscellaneous Flashing

1. Detail Membrane

A 60 mil (1.5 mm) fiberglass reinforced membrane, available 12″ x 50′ (30.5 cm x 15.2 m) roll and 24″ x 50′ (61 cm x 15.2 m) roll, more pliable than Sarnafil G410 membrane, good use for flashing pipes, corners, and unusual shaped penetrations.

2. Sarnacircles

A 60 mil (1.5mm) thick prefabricated 4 1/2 in. round circle patch injection molded.

3. Sarnacorners - Inside

A 60 mil (1.5 mm) thick prefabricated inside corner injection molded.

4. Sarnacorners - Outside

A 60 mil (1.5 mm) thick prefabricated outside corner injection molded.

5. Sarnastack Universal, A, B, or C

A 60 mil (1.5 mm) thick prefabricated stack/pipe boot injection molded.

6. Open Post Flashing

A 48 mil (1.2 mm) thick prefabricated flashing using weld technology convenient to flash obstructed rooftop conduits and pipes. Open post flashings are fabricated with an open seam and are available in different sizes.

7. Sarnareglet

A heavy-duty, extruded aluminum flashing termination reglet used at walls and large curbs. Sarnareglet is produced from 6063-T5, 0.10 inch to 0.12 inch (2.5 mm to 3.0 mm) thick extruded aluminum.

Sarnareglet has a 2-1/4 inch (57 mm) deep profile, and is provided in 10 foot (3 m) lengths. Use prefabricated Sarnareglet mitered inside and outside corners where walls intersect.

8. Sarnadrain - UFlow

A seamless heavy-duty aluminum drain, featuring a coated flange for hot air welding of Sarnafil membranes. Sarnadrain-Uflow consists of a one-piece spun, 0.125 in.(3.175 mm), 11 gauge thick aluminum body, a 17.5” (445 mm) diameter, and a 12” (305 mm) long drain stem.

9. Membrane and Flashing Adhesive

A Sarnacol 2170 VC solvent-based, VOC compliant, reactivating adhesive used to attach membrane to flashing substrate. Typical flashing substrate coverage rate is 45-60ft² /gal (1.10–1.47m²/L).

2.01 ATTACHMENT COMPONENTS

A. Membrane Adhesive

1. Sarnacol 2170 VC Adhesive:

A solvent-based, VOC compliant, reactivating adhesive used to attach the membrane to the substrate.

SARNACOL 2170 / 2170 VC COVERAGE RATES FOR BAREBACK MEMBRANE

Substrate Membrane Total Approximate

/ Pail

Polyisocyanurate Felt Facer 80 ft² /gal (2.0 m²/L)

200 ft² /gal (4.9 m²/L)

57 ft² /gal (5.3 m²/L)

285 ft² (26.5 m²)

Polyisocyanurate Glass Facer 100 ft² /gal (2.5 m²/L)

200 ft² /gal (4.9 m²/L)

67 ft² /gal (6.2 m²/L)

333 ft² (30.9 m²)

Smooth Plywood 100 ft² /gal (2.5 m²/L)

200 ft² /gal (4.9 m²/L)

67 ft² /gal (6.2 m²/L)

333 ft² (30.9 m²)

Smooth Concrete Deck 80 ft² /gal (2.0 m²/L)

200 ft² /gal (4.9 m²/L)

57 ft² /gal (5.3 m²/L)

285 ft² (26.5 m²)

DensDeck Prime 100 ft² /gal (2.5 m²/L)

200 ft² /gal (4.9 m²/L)

67 ft² /gal (6.2 m²/L)

333 ft² (30.9 m²)

Notes:

a) Due to an increase in viscosity when outdoor temperatures during installation are below 40°F

(5°C), add 1/2 gallon per 100 ft² (2.5m²) to rate for estimating purposes.

2.02 MISCELLANEOUS ACCESSORIES

A. Sarnamatic 661 or 681

220 volt, self-propelled, hot-air welding machine used to seal Sarnafil membrane seams.

B. Aluminum Tape

A 2 inch (50 mm) wide pressure-sensitive aluminum tape used as a separation layer between small areas of asphalt contamination and the membrane and as a bond-breaker under the coverstrip at Sarnaclad joints.

C. Multi-Purpose Tape

A high performance sealant tape used with metal flashings as a preventive measure against air and wind blown moisture entry.

D. Seam Cleaner

Seam Cleaner is used on PVC membranes to clean the in the seam area only.

E. Sarnastop

An extruded aluminum, low profile bar used with certain Sarnafasteners to attach to the roof deck or to walls/curbs at terminations, penetrations and at incline changes of the substrate. Sarnastop is a 1 inch (25

mm) wide, flat aluminum bar 1/8 inch (3 mm) thick that has predrilled holes every 6 inches (152 mm) on center.

2.03 SEALANTS AND PITCH POCKET FILLERS

A. Sikaflex-1a

A premium-grade, high-performance, moisture-cured, one-component polyurethane-based, non-sag elastomeric sealant used in wall, curb and drain terminations. It is also used as a sealant at pipe penetrations and under certain metal flashings. Sikaflex-1a can be used as a pourable sealer pocket filler.

B. Sarnafiller (two-component urethane adhesive for pitch pocket toppings).

2.04 MISCELLANEOUS FASTENERS AND ANCHORS

All fasteners, anchors, nails, straps, bars, etc. shall be post-galvanized steel, aluminum or stainless steel.

Mixing metal types and methods of contact shall be assembled in such a manner as to avoid galvanic corrosion. Fasteners for attachment of metal to masonry shall be expansion type fasteners with stainless steel pins. All concrete fasteners and anchors shall have a minimum embedment of 1-1/4 inch (32 mm) and shall be approved for such use by the fastener manufacturer. All miscellaneous wood fasteners and anchors used for flashings shall have a minimum embedment of 1 inch (25 mm) and shall be approved for such use by the fastener manufacturer.

PART 3 - EXECUTION

3.01 PRE-CONSTRUCTION CONFERENCE

A. The Applicator, Owner's Representative/Designer and Manufacturer(s) shall attend a pre-construction conference.

B. The meeting shall discuss all aspects of the project including but not limited to:

1. Safety

2. Set up

3. Construction schedule

4. Contract conditions

5. Coordination of the work

3.02 SUBSTRATE CONDITION

A. Applicator shall be responsible for acceptance or provision of proper substrate to receive new roofing materials.

B. Applicator shall verify that the work done under related sections meets the following conditions:

1. Roof drains and scuppers have been reconditioned or replaced and installed properly.

2. Roof curbs, nailers, equipment supports, vents and other roof penetrations are properly secured and prepared to receive new roofing materials.

3. All surfaces are smooth and free of dirt, debris and incompatible materials.

4. All roof surfaces shall be free of water, ice and snow.

3.03 SUBSTRATE INSPECTION

A. A dry, clean and smooth substrate shall be prepared to receive the Sikaplan Mechanically-Attached system.

B. The substrate shall be clean, smooth, dry, free of flaws, sharp edges, loose and foreign material, oil and grease. Roofing shall not start until all defects have been corrected.

C. All roof surfaces shall be free of water, ice and snow.

D. Membrane shall be applied over compatible and accepted substrates only.

3.04 SUBSTRATE PREPARATION

The roof deck and existing roof construction must be structurally sound to provide support for the new roof system. The Applicator shall load materials on the rooftop in such a manner as to eliminate risk of deck overload due to concentrated weight. The Owner's Representative shall ensure that the roof deck is secured to the structural framing according to local building code and in such a manner as to resist all anticipated wind loads in that location. Reroofing with Removal of Existing Single-Ply Membrane

The Owner's Representative and Applicator shall determine the condition of the roof deck and existing insulation. Deteriorated decking or wet or deteriorated materials are to be removed and replaced. After removal of single-ply roof, inspect insulation boards and reuse only if dry and in stable condition. Add a approved recover board or new insulation board. Fasten recover board or top layer of insulation in accordance with Sika Corporation's requirements.

3.05 SARNAFIL G410 MEMBRANE INSTALLATION

The surface of the insulation or substrate shall be inspected prior to installation of the Sarnafil roof membrane. The substrate shall be clean, dry, free from debris and smooth with no surface roughness or contamination. Broken, delaminated, wet or damaged insulation boards shall be removed and replaced.

Sarnacol 2170 VC:

2. Over the properly installed and prepared substrate surface, adhesive shall be applied using solvent-resistant 3/4 inch (19 mm) nap paint rollers. The adhesive shall be applied to the substrate at a rate according to Sika Corporation requirements. The adhesive shall be applied in smooth, even coating with no gaps, globs, puddles or similar inconsistencies. Only an area which can be completely covered in the same day's operations shall be coated with adhesive. The first layer of adhesive shall be allowed to dry completely prior to installing the membrane.

3. When the adhesive on the substrate is dry, the Sarnafil roof membrane is unrolled. Adjacent sheets shall be overlapped 3 inches (75 mm). Once in place, one-half of the sheet's length shall be turned back and the underside shall be coated with adhesive at a rate of 1/2 gallon per 100 square feet (0.2 liters per m²). When the membrane adhesive has dried slightly to produce strings when touched with a dry finger, the coated membrane shall be rolled onto the previously-coated substrate being careful to avoid wrinkles. Do not allow adhesive on the underside of the Sarnafil membrane to dry completely. The amount of membrane that can be coated with adhesive before rolling into substrate will be determined by ambient temperature, humidity and crew. The bonded sheet shall be pressed firmly in place with a minimum 100 lb (45 kg) steel, membrane roller, by rolling in two directions.

4. The remaining un-bonded half of the sheet shall be folded back and the procedure repeated.

Notes:

The Applicator shall count the amount of pails of adhesive used per area per day to verify conformance to the specified adhesive rate.

Do not install when air temperature is within 5° of dew point. Solvent evaporation time increases significantly when temperatures drop.

No adhesive shall be applied in seam areas. All membrane shall be applied in the same manner.

3.09 HOT-AIR WELDING OF SEAM OVERLAPS

A. General

1. All seams shall be hot-air welded. All membrane to be welded shall be clean and dry.

2. All mechanics intending to use hot-air welding equipment shall have successfully completed a training course provided by a Sika Corporation Technical Service Representative prior to welding.

3. Hot-air welding equipment shall be allowed to warm up for at least one minute prior to welding.

4. Seam overlaps should be 3 inches (76 mm) wide when automatic machine-welding and 4 inches (100

mm) wide when hand-welding, except for certain details.

B. Hand-Welding

1. The back edge of the seam shall be welded with a narrow but continuous weld to prevent loss of hot air during the final welding.

2. The nozzle shall be inserted into the seam at a 45 degree angle to the edge of the membrane. Once the proper welding temperature has been reached and the membrane begins to "flow”, the hand roller is positioned perpendicular to the nozzle and rolled lightly. For straight seams, the 1-1/2 inch (40 mm) wide nozzle is recommended for use. For corners and compound connections, the 3/4 inch (20 mm) wide nozzle shall be used.

C. Machine Welding

1. Machine welded seams are achieved by the use of approved automatic welding equipment. When using this equipment, all instructions shall be followed and local codes for electric supply, grounding and over current protection observed. Dedicated circuit house power or a dedicated portable generator is recommended. No other equipment shall be operated simultaneously off the generator.

2. Metal tracks may be used over the deck membrane and under the machine welder to minimize or eliminate wrinkles.

D. Quality Control of Welded Seams

1. The Applicator shall check all welded seams for continuity using a rounded screwdriver. Visible evidence that welding is proceeding correctly is smoke during the welding operation, shiny membrane surfaces, and an uninterrupted flow of dark gray material from the underside of the top membrane. On-site evaluation of welded seams shall be made daily by the Applicator at locations as directed by the Owner's Representative or Sika Corporation's representative. One inch (25 mm) wide cross-section samples of welded seams shall be taken at least three times a day. Correct welds display failure from shearing of the membrane prior to separation of the weld. Each test cut shall be patched by the Applicator at no extra cost to the Owner.

3.10 MEMBRANE FLASHING INSTALLATION

All flashings shall be installed concurrently with the roof membrane as the job progresses. No temporary flashings shall be allowed without the prior written approval of the Owner's Representative and Sika Corporation. Approval shall only be for specific locations on specific dates. If any water is allowed to enter under the newly completed roofing, the affected area shall be removed and replaced at the Applicator's expense. Flashing shall be adhered to compatible, dry, smooth, and solvent-resistant surfaces. Use caution to ensure adhesive fumes are not drawn into the building.

A. Sarnacol Adhesive for Membrane Flashings

1. Over the properly installed and prepared flashing substrate, the Sarnacol adhesive shall be applied in smooth, even coats with no gaps, globs or similar inconsistencies. Only an area which can be completely covered in the same day's operations shall be flashed. The bonded sheet shall be pressed firmly in place with a hand roller.

2. No adhesive shall be applied in seam areas that are to be welded. All panels of membrane shall be applied in the same manner, overlapping the edges of the panels as required by welding techniques.

B. Install Sarnastop/Sarnabar/Sarnacord according to the Detail Drawings with approved fasteners into the structural deck at the base of parapets, walls and curbs. Sarnastop is required by Sika Corporation at the base of all tapered edge strips and at transitions, peaks, and valleys according to Sika Corporation's details.

C. Sika Corporation's requirements and recommendations and the specifications shall be followed. All material submittals shall have been accepted by Sika Corporation prior to installation.

D. All flashings should extend a minimum of 8 inches (0.2 m) above roofing level, exceptions to this might be pipe boots and/or sealant pockets, etc. If in question, submit in writing to the Owner's Representative and Sika Corporation Technical Department for signed approval.

E. All flashing membranes shall be consistently adhered to substrates. All interior and exterior corners and miters shall be cut and hot-air welded into place. No bitumen shall be in contact with the Sarnafil membrane.

F. All flashing membranes shall be mechanically fastened along the counter-flashed top edge with Sarnastop at 6 to 8 inches (0.15 to 0.20 m) on center.

G. Sarnafil flashings shall be terminated according to Sika Corporation recommended details.

H. All adhered flashings that exceed 30 inches (0.75 m) in height shall receive additional securement. Consult

Sika Corporation Technical Department for securement methods.

3.11 TEMPORARY CUT-OFF

All flashings shall be installed concurrently with the roof membrane in order to maintain a watertight condition as the work progresses. All temporary waterstops shall be constructed to provide a 100 percent watertight seal. The stagger of the insulation joints shall be made even by installing partial panels of insulation. The new membrane shall be carried into the waterstop. Waterstop shall be sealed to the deck or substrate so that water will not be allowed to travel under the new or existing roofing. The edge of the membrane shall be sealed in a continuous heavy application of sealant as described in Section 2.03. When work resumes, the contaminated membrane shall be cut out. All sealant, contaminated membrane, insulation fillers, etc. shall be removed from the work area and properly disposed of off-site. None of these materials shall be used in the new work.

If inclement weather occurs while a temporary waterstop is in place, the Applicator shall provide the labor necessary to monitor the situation to maintain a watertight condition.

If any water is allowed to enter under the newly-completed roofing, the affected area shall be removed and replaced at the Applicator's expense.

3.12 COMPLETION

Prior to demobilization from the site, the work shall be reviewed by the Owner's Representative and the Applicator. All defects noted and non-compliances with the Specifications or the recommendations of Sika Corporation shall be itemized in a punch list. These items must be corrected immediately by the Applicator to the satisfaction of the Owner's Representative and Sika Corporation prior to demobilization.

3.13 DETAILS

Refer to Typical System Details section or usa.sarnafil.sika.com.