**STANDARD SPECIFICATION**

**SECTION 07531**

**[SINGLE PLY ROOFING - PVC]{.underline}**

Page

PART 1 - GENERAL

1.01 Related Documents

1.02 Description of Work

1.03 References

1.04 Submittals 4

1.05 Quality Assurance

1.06 Delivery, Storage and Handling

1.07 Project Conditions

1.08 Warranty

PART 2 - PRODUCTS

2.01 General

2.02 Membrane

2.03 Flashing Membrane

2.04 Insulation

2.05 Accessory Products

PART 3 - EXECUTION

3.01 Inspection

3.02 Preparation of Substrate

3.03 Installation of Insulation

3.04 Installation of Membrane

3.05 Membrane Flashings

3.06 Temporary Cutoff

3.07 Walkway Installation

3.08 Completion

**STANDARD SPECIFICATION**

**SECTION 07531**

**[SINGLE PLY ROOFING - PVC]{.underline}**

# PART 1 - GENERAL

1.01 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General
and Supplementary Conditions and Division 1 Specification Sections.

B. Related Sections include the following:

1\. Section 07600 Flashing and Sheet Metal

2\. Section 13100 Lightning Protection

3\. Section 15401 Plumbing, for roof drains

## 1.02 [DESCRIPTION OF WORK]{.underline} 

A. This section includes all material, labor, equipment, temporary
protection and tools for the proper installation and completion of the
work as required in this specification.

B. The following items are specified in this section:

1\. Roof Insulation

2\. Fasteners

3\. Roof membrane

4\. Roof membrane flashings

5\. Treated wood

6.  Sealants

7\. Adhesives

## 1.03 REFERENCES 

A. American Society of Testing and Materials (ASTM)

A653 Specification for Steel Sheet, Zinc-Coated (Galvanized) or
Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

D570 Test Method for Water Absorption of Plastics

D751 Test Methods for Coated Fabrics

D1204 Test Method for Linear Dimensional Changes of Non-rigid
Thermoplastic Sheeting or Film at Elevated Temperature

D2136 Test Method for Coated Fabrics-Low Temperature Bend Test

D2565 Practice for Operating Xenon Arc-Type Light-Exposure Apparatus
with and without Water for Exposure of Plastics

D3045 Practice for Heat Aging of Plastics Without Load

D4434 Specification for Poly (Vinyl Chloride) Sheet Roofing

E84 Test Method for Surface Burning Characteristics of Building
Materials

E408 Standard Test Methods for Total Normal Emittance of Surfaces Using
Inspection-Meter Techniques

> E903 Standard Test Method for Solar Absorptance, Reflectance, and
> Transmittance of Materials Using Integrating Spheres

B. California South Coast Air Quality Management District (AQMD)

Rule 1168 Adhesive and Sealant Applications

C. California Bay Area Air Quality Management District (AQMD)

Regulation 8, Rule 51 Organic Compounds, Adhesive and Sealant Products

D. Factory Mutual (FM)

Approval Guide

Approval Standard No. 4470 Class 1 Roof Covers

E. Federal Specification (FS)

HH-I-1972/2 Class 1 Insulation Board, Thermal, Polyurethane or
Polyisocyanurate, Faced with Asphalt/Glass Fiber Felt on Both Sides of
the Foam

F.  National Roofing Contractors Association (NRCA)

Roofing and Waterproofing Manual

G. Underwriter's Laboratories, Inc. (UL)

Roofing Materials and Systems Directory

## 1.04 SUBMITTALS

A. Product Data: Submit manufacturer's technical product data,
installation instructions and recommendations for each type of roofing
product required. Include data substantiating that materials comply with
the specified requirements.

B. Submit copy of the membrane manufacturer's warranty covering
materials.

C. Submit copy of the Roofing Contractor's warranty covering
workmanship.

D. Submit dimensioned shop drawings which shall include:

1\. An outline of the roof and roof size.

2\. Proposed installation method for each different section of roof.
Include insulation type (e.g. flat, tapered) and fastener patterns if
applicable. Show Contractor's proposed method of achieving specified
roof slopes.

3.  Proposed profile details of flashing methods for penetrations and
    terminations if not indicated in the Contract Documents.

4.  Proposed location of manufacturer approved walkpads. Corners of
    walkway are to be rounded and welded in accordance with
    manufacturer's written instructions. All side and end joints shall
    be hot-air welded a minimum of 2"- inches (51mm). No adhesive shall
    be present within lap areas.

E. Submit report from an independent testing laboratory certifying that
the manufacturer's membrane has met a minimum of 10,000 hours of Xenon
exposure, according to ASTM D2565.

F. Submit written documentation from the manufacturer that the proposed
roofing system including insulation and fasteners meets the applicable
requirements and code approvals as referenced in this specification and
that the roofing system meets the requirements for the manufacturer's
standard warranty covering material.

G. Submit from membrane manufacturer a list of successful Contractor
personnel who have been trained to perform membrane welding and who will
be utilized on this project. Membrane manufacturer also to submit
approval of Contractor's welding equipment.

H. Submit location and name(s) of building owner(s) to meet the
installation requirement of 500 roofing squares for more than five (5)
years in the Southwest.

I. Submit manufacturer's documentation of Energy Star labeled roofing
materials.

J. Submit Material Safety Data Sheets (MSDS) and manufacturer's
documentation of Volatile Organic Compound (VOC) content for each
adhesive and sealant product.

K. Submit manufacturer's documentation of recycled content for
Polyisocyanurate insulation.

## 1.05 QUALITY ASSURANCE

A. This roofing system shall be applied only by an approved Contractor
authorized prior to bid by the roof membrane manufacturer. Prior to bid,
the roofing Contractor must have completed a minimum of 500 roofing
squares of PVC membrane in the Southwest. To qualify for this
requirement, the completed membrane must have met all conditions to
obtain material and labor warranty, and must be performing successfully.

B. Membrane manufacturer shall supply a list of projects, completed in
the Southwest, where the specified membrane has been in place and
performing successfully for a period of not less than five (5) years. A
minimum of 500 roofing squares must have been installed to meet this
requirement.

C. There shall be no deviation from this specification or the approved
shop drawings without prior written approval by the manufacturer and the
Sandia Delegated Representative (SDR).

D. Code Requirements: The proposed roofing system shall meet the
requirements of the following recognized code approval or testing
agencies. These requirements are minimum standards and no roofing work
shall commence without written documentation of the system's compliance,
as required in Article 1.03 "Submittals."

1\. Underwriters Laboratories (UL) Class A membrane.

> 2\. Factory Mutual (FM) 1-60 or 1-90 uplift rating, as indicated on
> Contract Documents per FM Approval Standard No. 4470.

E.  Energy Star Roof Compliance: The proposed roofing system shall be
    Energy Star Roof-compliant and roofing materials shall be Energy
    Star labeled.

F.  For new installations, ponding shall not occur in accordance with
    NRCA Roofing and Waterproofing Manual good roof design practice,
    which dictates that there shall be no ponding of water present
    48-hours after rainfall.

G.  There shall be no more than 20 patches per 10,000sf on new
    construction.

## 1.06 DELIVERY, STORAGE AND HANDLING

A. All products delivered to the job site shall be in the original
unopened container or wrappings.

B. Membrane rolls and insulation shall be stored fully protected from
moisture and wind damage. Remove plastic from insulation and cover with
tarpaulins on a raised surface.

C. Bonding adhesives shall be stored at temperatures recommended by the
manufacturer.

D. Handle all materials to prevent damage. Any materials which are
determined damaged, according to the SDR, are to be removed from the job
site and replaced at no cost to Sandia National Laboratories (SNL).

## 1.07 PROJECT CONDITIONS

A. Construction may not be fully represented on the drawings, and some
modifications to details may be required to accomplish the intent of the
documents.

Contractor shall ascertain to his satisfaction, coordinate with General
Contractor and other sub-contractors, prior to bidding, that the
specifications and drawings are workable and that they are not in
conflict with the manufacturer's requirements for a material warranty.

B. All work shall be scheduled and executed without exposing the
interior building areas to the effects of inclement weather. The
building and its contents shall be protected against all risks, and any
damages shall be repaired or replaced at no cost to SNL. All exterior
lighting, equipment, landscaping and paving shall be protected from
damage.

C. Contractor shall test drains per SDR's direction prior to and upon
completion of roofing work to insure that no blockage exists or has
occurred.

D. Only as much of the new roofing as can be made weathertight each day
including all flashing work, shall be installed. Plug all roof drains
before starting work each day and unplug all drains at the end of each
workday.

E. All surfaces to receive insulation, membrane or flashing shall be
thoroughly clean and dry. Should surface moisture occur, the Contractor
shall provide the necessary equipment and labor to dry the surface prior
to application.

F. All construction, including equipment and accessories, shall be
secured against wind blow-off damage.

G. Temporary waterstops shall be installed at the end of each day's work
and shall be removed before proceeding with the next day's work.
Waterstops shall be compatible with all materials, shall not emit
dangerous or incompatible fumes, and shall be installed per
manufacturer's recommendations.

H. Contractor shall provide all necessary protection and barriers to
segregate the work area and to prevent damage to adjacent areas. Plywood
protection shall be provided for all new and existing roof areas which
receive traffic during construction.

I. Prior to and during applications, all dirt, debris and dust shall be
removed from surfaces either by sweeping or vacuuming. Compressed air
cleaning is prohibited.

J. Liquid materials such as solvents and adhesives shall be stored and
used away from open flames, sparks and excessive heat.

K. Membranes and accessories shall not be exposed to a prolonged
temperature in excess of 160 degrees F (71 degrees C).

L. Contaminants, such as grease, fats, oils and solvents shall not be
allowed to come into direct contact with the roofing membrane. Any
exposures shall be presented to the membrane manufacturer for assessment
of impact on the roof system performance.

M. Site clean-up, including both interior and exterior building areas
below or adjacent to or in any way affected by the construction of the
roof. Cleaning of the membrane with gasoline is prohibited. Only
cleaners approved by the roof membrane manufacturer and the SDR shall be
used to clean the membrane. Notify the SDR before using any solvent or
cleaner to allow intake fans to be shut down.

N. All roofing, insulation, flashings, and metal work removed for
construction shall be promptly taken off the site to a legal dumping
area.

O. Contractor shall take care during application and storage that
overloading of the deck and structure does not occur.

P. Precautions shall be taken when using adhesives at or near rooftop
vents or air intakes. Coordinate closing or shut-offs of vents and air
intakes during roofing and flashing operations.

## 1.08 WARRANTY

A. Upon construction completion, the manufacturer's ten (10) year
warranty covering materials shall be issued to SNL.

B. Roofing Contractor shall supply SNL with a minimum two (2) year
workmanship warranty. In the event any work related to roofing,
flashing, or metalwork is found to be defective or otherwise not in
accordance with the Contract Documents within two (2) years of final
acceptance, the Roofing Contractor shall remove and replace the defects
at no cost to SNL.

# PART 2 - PRODUCTS

## 2.01 GENERAL

Provide an insulated roofing system that is comprised of fully
compatible components for use in the proposed application. All proposed
materials shall be compatible with substrate.

## 2.02 MEMBRANE

PVC: Polyester scrim reinforced polyvinylchloride (PVC) sheet conforming
to ASTM D4434, and the following minimum physical properties:

#### Fully Adhered and Mechanically Fastened System

+--------------------------------+---------------+--------------------+
| **[Property]{.underline}**     | # **ASTM      | **[Specificat      |
|                                | Test Method** | ion]{.underline}** |
+--------------------------------+---------------+--------------------+
|                                |               |                    |
+--------------------------------+---------------+--------------------+
| Color                          |               | White              |
+--------------------------------+---------------+--------------------+
| Overall Thickness (min.)       | D751          | 0.060"-inch (1.5   |
|                                |               | mm)                |
+--------------------------------+---------------+--------------------+
| Breaking Strength (min.)       | D751 (Grab    | 200 lbf/inch (35   |
|                                | Method)       | kN/m)              |
+--------------------------------+---------------+--------------------+
| Elongation at Break, (min.)    |               |                    |
+--------------------------------+---------------+--------------------+
| (M.D. x C.D.)                  | D751          | 15%                |
+--------------------------------+---------------+--------------------+
| Seam Strength (min.)           | D751          | 75% of Breaking    |
|                                |               | Strength           |
+--------------------------------+---------------+--------------------+
| Retention of Properties After  | D3045         |                    |
| Heat Aging                     |               |                    |
+--------------------------------+---------------+--------------------+
| Breaking Strength (min.)       | D751          | 80% of Original    |
+--------------------------------+---------------+--------------------+
| Elongation (min.)              | D751          | 80% of Original    |
+--------------------------------+---------------+--------------------+
| Tear Strength (min.)           | D751 (Tongue  | 45 lbf (200 N)     |
|                                | Tear)         |                    |
+--------------------------------+---------------+--------------------+
| Low Temperature Bend           | D2136         | Pass               |
+--------------------------------+---------------+--------------------+
| Accelerated Weathering Test    | D2565         | No cracking        |
| (Xenon)                        |               | (10,000 hours)     |
+--------------------------------+---------------+--------------------+
| Cracking                       |               | None               |
+--------------------------------+---------------+--------------------+
| Discoloration                  |               | Negligible         |
+--------------------------------+---------------+--------------------+
| Crazing                        |               | None               |
+--------------------------------+---------------+--------------------+
| Linear Dimensional Change      | D1204         | 0.5%               |
| (max.)                         |               |                    |
+--------------------------------+---------------+--------------------+
| Change in Weight After         | D570          | [+]{.underline}3.0 |
| Immersion in Water (max.)      |               | %                  |
+--------------------------------+---------------+--------------------+
| Initial Solar Reflectance      | E903          | 0.65               |
| (min.)                         |               |                    |
+--------------------------------+---------------+--------------------+
| 3-year-aged Solar Reflectance  | E903          | 0.50               |
| (min.)                         |               |                    |
+--------------------------------+---------------+--------------------+
| Emissivity (min.)              | E408          | 0.90               |
+--------------------------------+---------------+--------------------+

## 2.03 FLASHING MEMBRANE

Flashing membrane shall be as supplied by the roofing membrane
manufacturer. Flashing membranes are generally the same material as the
roofing membrane, unless otherwise specified in the Contract Documents.

## 2.04 INSULATION

A. General: Provide insulating materials to comply with referenced
standards and requirements indicated for materials; provide
manufacturer's standard thicknesses, in size to fit applications.

1\. Fully Adhered Systems: Provide no greater than 4'-feet by 4'-feet
(1.2 m x 1.2 m) boards.

2\. Mechanically Fastened Systems: Provide 4'-feet by 8'-feet (1.2 m x
2.4 m) boards

B. Polyisocyanurate Board Roof Insulation: Provide cellular thermal
insulation with Polyisocyanurate closed-cell foam core and
manufacturer's standard facing laminated to both sides to comply with FS
HH-I-1972/2 Class 1. Provide in two (2) layers for a total thickness to
meet an average R-value of 30.0, unless indicated elsewhere on the
Contract Documents.

Surface Burning Characteristics: Comply with ASTM E84 with a maximum
flame spread and smoke developed values of 25 and 145, respectively.

Recycled Content: Minimum 9 percent.

C. Insulation, fasteners and adhesive shall be supplied or approved by
the roof membrane manufacturer for compatibility with the system and the
required FM and UL requirements. Adhesives shall comply with VOC limits
of California South Coast AQMD Rule #1168.

D. Recovery Board: Provide one half-inch (1/2"-inch, 13 mm) Den's Deck,
or approved equal, over all insulation and tapered insulation.

## 2.05 ACCESSORY PRODUCTS

A. Flashing Adhesive: As specified by the membrane manufacturer to
comply with VOC limits of California South Coast AQMD Rule #1168. Any
adhesives containing carcinogens shall be limited to vertical surfaces
and flashings.

B. Walktread Membrane: Membrane manufacturer's walktread material.

C. Wood Nailers: Treated wood nailers shall be installed at the
perimeter of the entire roof and around such other roof projections and
penetrations as specified on the Contract Documents. Wood shall be #2 or
better, treated fire retardant lumber. Creosote and asphaltic
preservatives are prohibited. Height of nailers shall match that of the
insulation thickness or as indicated on the drawings. Nailers shall be
firmly anchored at a maximum spacing of 12"-inches (305 mm) unless noted
otherwise on drawings and capable of resisting a force of 300 pounds per
lineal foot (446 kg per meter) in any direction. One-half inch
(1/2"-inch, 13 mm) expansion spaces shall be provided between lengths of
nailers.

D. Sealants: As recommended by the membrane manufacturer to comply with
VOC limits of California Bay Area AQMD Regulation 8, Rule 51.

E. Miscellaneous Fasteners and Anchors: In general, all fasteners,
anchors, nails and straps shall be of zinc-coated steel, galvanized, or
stainless steel, and cadmium-free. All fasteners and anchors shall have
a minimum embedment of 1-1/2"-inch (38 mm) and shall be approved for
such use by the fastener manufacturer and the membrane manufacturer.

F. Sheet Metal Accessory Materials: ASTM A653, with 0.20 percent copper,
G90 hot-dipped galvanized, 24-gauge (0.61 mm) or heavier.

G. Expansion Joint Covers: Shall be the manufacturer's prefabricated
units of the same material as the roof membrane.

H. Perimeter Edge Metal: Shall be supplied by the membrane manufacturer
and coated with the same material as the roofing membrane and shall be
compatible with the roofing membrane for hot air welding.

I. Slip Sheet: Provide only when needed between incompatible materials.
Use membrane manufacturer's standard slip sheet material.

J.  Base Sheet: Provide membrane manufacturer's recommended vented base
    sheet on all types of concrete decks or when required or recommended
    by membrane manufacturer for the intended application.

K.  B-Line Rooftop Supports or approved equal. To be placed at a minimum
    of 10'-feet (3m) on center for proper support. Refer to SNL Standard
    Detail Drawing for rooftop supports, AE5035 and AE5036.

# PART 3 - EXECUTION

## 3.01 INSPECTION

A. Prior to all work of this section, Contractor shall carefully inspect
the installed work of all other trades and verify that all such work is
complete to the point where this installation may properly commence.

B. Verify that work of other trades that penetrate the roof deck has
been completed.

C. Verify that roofing system may be installed in strict accordance with
all pertinent codes and regulations, the original design and the
manufacturer's recommendations.

D. In the event of discrepancy, immediately notify the SDR.

E.  Do not proceed with installation in areas of discrepancy until all
    such discrepancies have been fully resolved.

F.  Upon starting the installation of a new roof, the SDR and the
    General Contractor, and their sub-contractors if applicable, will
    designate a portion of the installation to be used as a mock-up.
    This area will be the model of how the roof installation shall be
    installed. The mock-up should include the insulation, a curb,
    flashing, parapet and an inside and outside corner along with a
    termination and lap seam.

G.  Throughout the project and at construction completion, the SDR shall
    be allowed to inspect the roof-including probing as necessary to
    ensure proper installation.

## 3.02 PREPARATION OF SUBSTRATE

A. General: Comply with the insulation and membrane manufacturer's
instructions for preparation of the substrate to receive the roofing
system.

B. Clean substrate of dust, debris, and other substances detrimental to
the system work. Remove sharp projections.

C. Notify the SDR to inspect the substrate. Contractor shall not proceed
with installation until the SDR has approved the substrate.

## 3.03 INSTALLATION OF INSULATION

A. Insulation shall be installed according to the insulation
manufacturer's instructions and shall be approved by the SDR and
membrane manufacturer.

B. Insulation shall be neatly cut to fit around all penetrations and
projections.

C. Install tapered insulation where applicable in accordance with
insulation manufacturer's approved shop drawings, in order to achieve
the specified slope.

D. Install tapered insulation around drains creating a drain sump.

E. Do not install more insulation board than can be covered with
membrane by the end of the day, or onset of inclement weather.

F. Attachment

1\. Insulation shall be mechanically fastened or fully adhered to the
deck with approved fasteners and plates or adhesives at a rate and
pattern acceptable to Factory Mutual's and membrane manufacturer's
requirements for fastening rates and patterns.

2\. Fasteners and adhesives are to be installed in accordance with the
fastener manufacturer's recommendations. Fasteners are to have a minimum
penetration into the structural deck as recommended by the fastener
manufacturer and membrane manufacturer. Fasten only in top of ribs of
metal deck, not flutes.

3\. Perform pull out tests for the SDR to verify deck conditions and
actual pull out values prior to installation of the membrane.

4\. Use fastener tools with a depth locator as recommended or supplied
by the fastener manufacturer to ensure proper installation.

5\. All joints and seams shall be a tight fit to prevent any gaps voids
and surface irregularities.

## 3.04 INSTALLATION OF MEMBRANE

A. Install materials in accordance with manufacturer's instructions for
the intended application.

B. Surface of the insulation shall be inspected prior to installation of
the roof membrane. The insulation surface shall be clean and smooth with
no excessive surface roughness, contaminated surfaces, or unsound
surfaces such as broken or delaminated insulation boards.

C. Membrane shall be installed per the membrane manufacturers written
installation procedures for an approved mechanically fastened or fully
adhered system.

D.  No bonding adhesive shall be applied to lap areas that are to be
    welded to flashing or adjacent sheets. All sheets shall be applied
    in the same manner, lapping all sheets as required by welding
    techniques. No peel and stick products allowed.

E.  Any repairs or patches shall be hot-air welded. No peel and stick
    products allowed.

F. Adjacent sheets shall be welded in accordance with the manufacturer's
written instructions. All side and end lap joints shall be hot-air
welded. Lap area shall be a minimum of 3"-inches (76 mm) wide when
machine welding, and a minimum of 4"-inches (102 mm) wide when hand
welding. No adhesive shall be present within the lap areas.

G. Hand and machine welding shall be carried out per the manufacturer's
written instructions. All mechanics intending to use the welding
equipment shall have successfully completed a course of instruction
provided by a manufacturer's representative prior to welding. All
welding equipment must be approved by the manufacturer prior to use.

H. All completed seams shall be checked by the Contractor after cooling
for continuity using a screwdriver or suitable blunt instrument. In
addition, on-site evaluation of welded seams shall be made by the
Contractor to locations as directed by the SDR or membrane
manufacturer's representative. Contractor shall provide 2"-inch (51 mm)
wide cross-sectional samples taken through completed seams.
Approximately two (2) samples will be taken per 100 roofing squares.
Correctly welded seams display failure from shearing of the membrane
prior to separation of the weld. Each test cut shall be patched by the
Contractor at no additional charge to SNL.

I. During the course of the work, the entire roof area shall be kept
clear of loose or spilled fasteners and metal scraps to guard against
accidental puncture of the membrane.

## 3.05 MEMBRANE FLASHINGS

A. All flashing shall be installed concurrently with the roof membrane
as the job progresses. No temporary membrane flashings shall be allowed
without the prior written approval of the SDR. Approval shall only be
for specific locations on specific dates.

B. All flashing membranes shall be fully adhered to substrates. All
interior and exterior corners and miters shall be cut and hot-air welded
in place, or prefabricated corners and miters may be used.

Bituminous elements shall not be in contact with non-compatible
membrane. Manufacturer's recommended isolator shall be used to isolate
non-compatible membrane flashing from bituminous coated elements such as
vent stacks and pipes penetrating the roof.

C. All flashings shall be hot-air welded at their joints and at their
connections with the roof membrane. No peel and stick products allowed.

D. Pipe penetrations shall be flashed a minimum of 8"-inches (203 mm)
above the roofing membrane, and terminate with a stainless steel hose
clamp with sealant applied along the top edge. Pipe should be isolated
by membrane. Factory fabricated pipe seals and roof membrane shall be
welded as outlined. A buffer layer of membrane shall be installed
between hose clamp and flashing sheet to avoid damage.

E. All curb flashing membranes shall be mechanically fastened along the
top using nails with 1"-inch (25 mm) diameter heads spaced a maximum of
6"-inches (152 mm) on center, or predrilled metal strips. All roof edge
flashings shall be hot-air welded to the membrane manufacturer's coated
metal. Predrilled metal strips shall be caulked along the top edge with
a sealant. Expansion pins with nylon sheaths set in predrilled holes
shall be used to secure flashings to masonry and concrete surfaces.
Reglets shall be used on walls as shown on the Contract Documents.

F. Edge metal shall be supplied by the membrane manufacturer and shall
be coated with the same material as the roofing membrane. The edge metal
and membrane strips joining each piece of edge metal shall closely match
the color of the building perimeter, unless specified elsewhere on the
Contract Documents or by the SDR.

## 3.06 TEMPORARY CUTOFF

A. Flashing shall be installed concurrently with roof membrane in order
to maintain watertight condition as work progresses. When a break in
day's work occurs in the central area of roof, temporary waterstop shall
be constructed to provide a watertight seal.

1\. Waterstop shall be installed per manufacturer's recommendations and
per details shown on Contract Documents.

2\. When work on new system is suspended, the stagger of insulation
joints shall be maintained by installing partial fillers. New membrane
shall be carried into the waterstop.

3\. When work resumes, the contaminated membrane, insulation fillers,
etc., shall be removed from work area and disposed off-site. Do not
reuse these materials in new work.

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

## 3.07 WALKWAY INSTALLATION

Walkways: Install walkway pads at locations shown in Construction
Documents. Hot-air weld along edges a minimum of 2"-inches (51mm) to
substrate, and fully adhere walkway pads between welds to substrate with
compatible adhesive according to roofing system manufacturer's written
instruction. Corners of walkway are to be rounded and hot-air welded in
accordance with manufacturer's written instruction.

## 3.08 CONSTRUCTION COMPLETION

A. At completion of construction and prior to Contractor's request for
final inspection by SDR, membrane manufacturer's technical consultant
shall provide on-site inspection of installed roofing system.

1\. Membrane manufacturer shall provide Contractor and SDR with itemized
list of defects or non-compliance with manufacturer's recommendations.

2\. Contractor shall immediately correct identified items. Complete
corrections before request for final inspection from SDR.

B. Prior to demobilization from site, work shall be reviewed by SDR and
Contractor.

1\. Itemize defects or non-compliance with these specifications or
membrane manufacturer's recommendations in punch list.

2.  Contractor shall immediately correct identified items prior to
    demobilization, to satisfaction of SDR and membrane manufacturer.

    C.  Upon completion of construction, the Contractor shall install a
        metal sign (minimum size of 8"-inch x 10"-inch, 203mm x 254mm)
        at each roof entryway providing the following information:

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1.  Contractor Company Name

2.  Membrane Manufacturer

3.  SNL Inspector Name

4.  Date of Installation

##### END OF SECTION