07 52 00 - AMDT0001.pdf

MOTSU22018ROOF MOTSU 22018 - Annual Roof Repair

AMDT0001

PROJECT TABLE OF CONTENTS

DI VI SI ON 01 - GENERAL REQUI REMENTS

01 10 00.10 38 SUPPLEMENTARY SPECIAL CONTRACT

REQUIREMENTS

01 11 00 08/15, CHG 2: 08/21 SUMMARY OF WORK

01 14 00 07/07 WORK RESTRICTIONS

01 20 00 11/20, CHG 2: 08/21 PRICE AND PAYMENT PROCEDURES

01 32 01.00 10 02/15 PROJECT PROGRESS SCHEDULE

01 33 00 08/18, CHG 4: 02/21 SUBMITTAL PROCEDURES

01 35 26 11/20, CHG 2: 11/21 GOVERNMENTAL SAFETY REQUIREMENTS

01 42 00 08/10 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00.00 10 08/18 QUALITY CONTROL

01 45 00.15 10 08/18 RESIDENT MANAGEMENT SYSTEM CONTRACTOR

MODE(RMS CM)

01 45 01 01/08 USACE QUALITY CONTROL

01 45 01.10 01/08 USACE QUALITY CONTROL SYSTEM (QCS)

01 50 00 08/09 TEMPORARY CONSTRUCTION FACILITIES AND

CONTROLS

01 57 19 11/15 TEMPORARY ENVIRONMENTAL CONTROLS

01 74 19 01/07 CONSTRUCTION AND DEMOLITION WASTE

MANAGEMENT

01 78 00 05/10 CLOSEOUT SUBMITTALS

DI VI SI ON 07 - THERMAL AND MOI STURE PROTECTI ON

07 52 00 MODIFIED BITUMINOUS MEMBRANE ROOFING

-- End of Project Table of Contents --

PROJECT TABLE OF CONTENTS Page 1

SECTION TABLE OF CONTENTS

DIVISION 07 - THERMAL AND MOISTURE PROTECTION

SECTION 07 52 00

MODIFIED BITUMINOUS MEMBRANE ROOFING

PART 1 GENERAL

1.1 REFERENCES

1.2 DESCRIPTION OF ROOF MEMBRANE SYSTEMS

1.3 SUBMITTALS

1.4 QUALITY ASSURANCE

1.4.1 Qualification of Manufacturer

1.4.2 Qualification of Applicator

1.4.3 Qualification of Engineer of Record

1.4.4 Fire Resistance

1.4.5 Wind Uplift Resistance

1.4.6 Preroofing Conference

1.5 DELIVERY, STORAGE, AND HANDLING

1.5.1 Delivery

1.5.2 Storage

1.5.3 Handling

1.6 ENVIRONMENTAL REQUIREMENTS

1.7 HOT-MOPPED ASPHALT APPLIED MODIFIED BITUMEN MEMBRANE SAFETY

1.7.1 Property Protection

1.7.2 Fire Watch

1.7.3 Equipment and Personnel Safety

1.7.4 Wind Conditions

1.8 SEQUENCING

1.9 WARRANTY

1.9.1 Roof Membrane Manufacturer Warranty

1.9.2 Roofing System Installer Warranty

1.9.3 Continuance of Warranty

1.10 CONFORMANCE AND COMPATIBILITY

PART 2 PRODUCTS

2.1 MATERIALS

2.2 MODIFIED BITUMEN SHEETS AND FIBERGLASS FELT MATERIALS

2.3 BASE FLASHING MEMBRANE

2.4 ASPHALT

2.5 MEMBRANE SURFACING

2.6 PRIMER

2.7 MODIFIED BITUMEN ROOF CEMENT

2.8 CANT AND TAPERED EDGE STRIPS

2.9 FASTENERS AND PLATES

2.9.1 Masonry or Concrete Walls and Vertical Surfaces

2.9.2 Metal Plates

2.10 PRE-MANUFACTURED ACCESSORIES

2.10.1 Pre-fabricated Curbs

2.10.2

2.11 WALKPADS

2.12 PAVER BLOCKS

2.13 ROOF INSULATION BELOW MODIFIED BITUMEN MEMBRANE SYSTEM

SECTION 07 52 00 Page 1

2.14 COVER BOARD (Recovery Board)

2.15 ALUMINUM

2.16 EDGE METAL/FLASHING/GUTTERS/DOWNSPOUTS/FASCIA

2.16.1 ADHESIVE - HOT

2.16.2 AHESIVE - COLD

2.16.2.1 POLYUREA FOR DRAINAGE

PART 3 EXECUTION

3.1 EXAMINATION

3.2 PREPARATION

3.2.1 Protection of Property

3.2.1.1 Protective Coverings

3.2.1.2 Bitumen Stops

3.2.2 Equipment

3.2.2.1 Mechanical Application Devices

3.2.2.2 Flame-Heated Equipment

3.2.2.3 Electric-Heated Equipment

3.2.3 Heating of Asphalt

3.2.3.1 Temperature Limitations for Asphalt

3.2.4 Priming of Surfaces

3.2.4.1 Priming of Concrete and Masonry Surfaces

3.2.4.2 Priming of Metal Surfaces

3.2.5 Membrane Preparation

3.2.6 Substrate Preparation

3.3 APPLICATION

3.3.1 Phased Membrane Construction

3.3.2 Temporary Roofing and Flashing

3.3.2.1 Removal

3.3.3 Application Method

3.3.3.1 Hot Asphalt Application of Modified Bitumen Membrane

3.3.4 Ventilating Base Sheets

3.3.5 Fiberglass Felt Modified Bitumen Base Sheet

3.3.6 Modified Bitumen Membrane Application

3.3.6.1 Cap Sheet Installation

3.3.6.2 Backnailing of Cap Sheet

3.3.7 Membrane Flashing

3.3.7.1 Membrane Strip Flashing

3.3.7.2 Membrane Flashing at Roof Drain

3.3.7.3 Pre-fabricated Curbs

3.3.7.4 Set-On Accessories

3.3.7.5 Lightning Protection

3.3.8 Roof Walkpads

3.3.9

3.3.10 Paver Blocks

3.3.11 Field Applied Surfacing

3.3.11.1 Aggregate

3.3.11.2 Coating Application

3.3.12 Correction of Deficiencies

3.3.13 Clean Up

3.4 CORRECTION OF DEFICIENCIES

3.5 PROTECTION OF APPLIED ROOFING

3.5.1 Water Cutoffs

3.5.2 Temporary Flashing for Permanent Roofing

3.5.3 Temporary Walkways, Runways, and Platforms

3.6 FIELD QUALITY CONTROL

3.6.1 Test for Surface Dryness

3.6.2 Construction Monitoring

3.6.2.1 Manufacturer's Inspection

SECTION 07 52 00 Page 2

3.6.3 Samples of Roofing

3.6.4 Roof Drain Test

3.7 INSTRUCTIONS TO GOVERNMENT PERSONNEL

3.8 INFORMATION CARDINFORMATION CARD

-- End of Section Table of Contents --

SECTION 07 52 00 Page 3

SECTION 07 52 00

MODIFIED BITUMINOUS MEMBRANE ROOFING

14OCT2021

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)

ASCE 7 (2017) Minimum Design Loads for Buildings and Other Structures

AMERICAN SOCIETY OF SAFETY PROFESSIONALS (ASSP)

ASSP A10.24 (2014) Roofing - Safety Requirements of Low-Sloped Roofs

ASPHALT ROOFING MANUFACTURER'S ASSOCIATION (ARMA)

ARMA 410BUR88 (2001) Manual of Roof Maintenance and Repair

ARMA PMBRG98 (1998) Quality Control Guideline for the Application of Polymer Modified Bitumen Roofing

ASTM INTERNATIONAL (ASTM)

ASTM C208 (2012; R 2017; E 2017; E 2019) Standard Specification for Cellulosic Fiber Insulating Board

ASTM C728 (2017a) Standard Specification for Perlite Thermal Insulation Board

ASTM C1289 (2018a) Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board

ASTM D41/D41M (2011; R 2016) Standard Specification for Asphalt Primer Used in Roofing, Dampproofing, and Waterproofing

ASTM D312/D312M (2016a) Standard Specification for Asphalt Used in Roofing

ASTM D2170/D2170M (2018) Standard Test Method for Kinematic Viscosity of Asphalts (Bitumens)

ASTM D4073/D4073M (2006; E 2019; R 2019) Standard Test Method for Tensile-Tear Strength of

SECTION 07 52 00 Page 4

Bituminous Roofing Membranes

ASTM D4263 (1983; R 2018) Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method

ASTM D4402/D4402M (2015) Viscosity Determination of Asphalt at Elevated Temperatures Using a Rotational Viscometer

ASTM D4586/D4586M (2007; E 2012; R 2012) Asphalt Roof Cement, Asbestos-Free

ASTM D5147/D5147M (2014) Standard Test Methods for Sampling and Testing Modified Bituminous Sheet Material

ASTM D6162/D6162M (2016) Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber Reinforcements

ASTM D6163/D6163M (2016) Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Glass Fiber Reinforcements

ASTM D6298 (2016) Standard Specification for Fiberglass Reinforced Styrene-Butadiene-Styrene (SBS) Modified Bituminous Sheet with a Factory Applied Metal Surface

ASTM E108 (2011) Fire Tests of Roof Coverings

FM GLOBAL (FM)

FM 4470 (2010) Single-Ply, Polymer-Modified Bitumen Sheet, Built-up Roof (BUR), and Liquid Applied Roof Assemblies for Use in Class 1 and Noncombustible Roof Deck Construction

FM APP GUIDE (updated on-line) Approval Guide http://www.approvalguide.com/

INTERNATIONAL CODE COUNCIL (ICC)

ICC IBC (2018) International Building Code

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 58 (2020) Liquefied Petroleum Gas Code

NFPA 241 (2022) Standard for Safeguarding Construction, Alteration, and Demolition Operations

SECTION 07 52 00 Page 5

NATIONAL ROOFING CONTRACTORS ASSOCIATION (NRCA)

NRCA C3701 (1997) Repair Manual for Low Slope Membrane Roof Systems

NRCA CONDET (2014) Construction Details Manual

NRCA RoofMan (2017) The NRCA Roofing Manual

CERTA Certified Roofing Torch Applicator

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA 1793 (2012) Architectural Sheet Metal Manual, 7th Edition

SINGLE PLY ROOFING INDUSTRY (SPRI)

ANSI/SPRI/FM 4435/ES-1 (2017) Test Standard for Edge Systems Used with Low Slope Roofing Systems

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

29 CFR 1910 Occupational Safety and Health Standards

29 CFR 1910.12 Construction Work

29 CFR 1926 Safety and Health Regulations for Construction

29 CFR 1926.16 Rules of Construction

UNDERWRITERS LABORATORIES (UL)

UL 790 (2004; Reprint Jul 2014) Standard Test Methods for Fire Tests of Roof Coverings

UL RMSD (2012) Roofing Materials and Systems Directory

1.2 DESCRIPTION OF ROOF MEMBRANE SYSTEMS

Minimum two-ply SBS modified bitumen roof membrane consisting of modified bitumen base sheet and cap sheet. Modified bitumen roof membrane must be set in hot modified asphalt

All work must follow the NRCA RoofMan guidelines and standards stated within this Section.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SECTION 07 52 00 Page 6

SD-02 Shop Drawings

Roof Plan; G (Drawing depicting wind loads and boundaries of enhanced perimeter and corner attachments of roof system components, as applicable); parapet flashing details, roof drain details and typical roof penetration details.

Identify all fire safety issues including exposed or concealed combustible materials, which may require additional protection during roof installation.

Field Inspection And Existing Conditions Report; G

SD-03 Product Data

Modified Bitumen Sheets; G

Heat Island Reduction; S

Fiberglass Felt; G

Primer; G

Modified Bitumen Roof Cement; G

Fasteners And Plates Sample Warranty certificate; G

Include in data written acceptance by the roof membrane manufacturer of the products and accessories provided. Provide p roducts as listed in the applicable wind uplift and fire rating classification listings, unless approved otherwise by the Contracting Officer.

Polyisocyanurate Boards; G

Roof Drains; G

Premanufactured Accessories; G

Asphalt; G

SD-05 Design Data

Wind Uplift Calculations; G

Provide Engineering calculations, signed, sealed, and dated by a qualified Engineer validating the wind resistance per ASCE 7, ASTM D4073/D4073M , and ANSI/SPRI/FM 4435/ES-1 of non-rated roof system.

SD-07 Certificates

Provide evidence that products used within this specification are manufactured in the United States.

Qualification of Manufacturer

SECTION 07 52 00 Page 7

Certify that the manufacturer of the modified bitumen membrane meets requirements specified under paragraph QUALIFICATION OF

MANUFACTURER.

Certify that the applicator meets requirements specified under paragraph QUALIFICATION OF APPLICATOR.

Certify that the Engineer of Record is fully qualified, competent, and currently licensed to practice in the project jurisdiction.

Bill of Lading

Submit bill of lading when labels of asphalt containers do not bear the flash point (FP), finished blowing temperature (FBT), and equiviscous temperature (EVT).

Wind Uplift Resistance; G classification, as applicable

Fire Resistance classification; G

Submit the roof system assembly wind uplift and fire rating classification listings.

Qualification Of Engineer Of Record; G

Qualification Of Applicator; G

Qualification Of Manufacturer; G

SD-08 Manufacturer's Instructions

Modified Bitumen Membrane Application; G

Flashing; G

Temperature Limitations for Asphalt

Base Sheet attachment, including pattern and frequency of mechanical attachments required in field of roof, corners, and perimeters to provide for the specified wind resistance.

Primer

Fasteners

Ventilating Base Sheets

Coating Application; G

Cold Weather Installation; G

Include detailed application instructions and standard manufacturer drawings altered as required by these specifications.

SECTION 07 52 00 Page 8

Include membrane manufacturer requirements for nailers and backnailing of roof membrane on steep slopes. Explicitly identify in writing, differences between manufacturer's instructions and the specified requirements.

SD-11 Closeout Submittals

Instructions To Government Personnel

Include copies of Safety Data Sheets for maintenance/repair materials.

Submit 30 year "No-Dollar-Limit" warranty for labor and materials including metal edge system in accordance with ANSI/SPRI ES-1 requirements..

Information Card; G

Warranty; G

1.4 QUALITY ASSURANCE

1.4.1 Qualification of Manufacturer

Modified bitumen sheet roofing system manufacturer must have a minimum of 20 years experience in manufacturing modified bitumen roofing products.

1.4.2 Qualification of Applicator

Roofing system applicator must be approved, authorized, or licensed in writing by the modified bitumen sheet roofing system manufacturer and have a minimum of five years experience as an approved, authorized, or licensed applicator with that manufacturer and be approved at a level capable of providing the specified warranty. The applicator must supply the names, locations and client contact information of five projects of similar size and scope that the applicator has constructed using the manufacturer's roofing products submitted for this project within the previous three years.

1.4.3 Qualification of Engineer of Record

Engineer of Record must be currently licensed within the jurisdiction of the project.

Engineer of Record must be approved, authorized, and currently licensed by the state of North Carolina, and have a minimum of five years experience as an approved Engineer for manufacturers of similar roof systems.

Engineer of Record must supply the names and locations of five projects of similar size and scope for which he has provided engineering calculations using the manufacturer's products submitted for this project within the previous three years. Engineer of Record must provide certified engineering calculations for:

Wind uplift requirements in accordance with Local and State codes

ASCE 7,in accordance with International Building Code.

Seismic requirements per local and state building codes

SECTION 07 52 00 Page 9

Seismic requirements per ICC IBC Chapter 16, Section 1608.3

Snow load requirements per ICC IBC Chapter 16 Section 1608.3 and Section 7 of ASCE 7

1.4.4 Fire Resistance

Complete roof covering assembly must:

a. Be Class A rated in accordance with ASTM E108, FM 4470, or UL 790 ; and

b. Be listed as part of Fire-Classified roof deck construction in UL RMSD, or Class I roof deck construction in FM APP GUIDE.

FM or UL approved components of the roof covering assembly must bear the appropriate FM or UL label.

1.4.5 Wind Uplift Resistance

Provide a complete roof system assembly that is rated and installed to resist wind loads calculated in accordance with ASCE 7 and validated by uplift resistance testing in accordance with Factory Mutual (FM) test procedures. Do not install non-rated systems, except as approved by the Contracting Officer. Submit licensed engineer's Wind uplift calculations and substantiating data to validate any non-rated roof system. Base wind uplift measurements on a design wind speed of 150 mph in accordance with ASCE 7 and other applicable building code requirements.

1.4.6 Preroofing Conference

After approval of submittals and before performing roofing and insulation system installation work, hold a preroofing conference to review the following:

a. Drawings, including Roof Plan, specifications and submittals related to the roof work

b. Roof system components installation

c. Procedure for the roof manufacturer's technical representative's onsite inspection and acceptance of the roof structure, and roofing substrate, the name of the manufacturer's technical representatives, the frequency of the onsite visits, distribution of copies of the inspection reports from the manufacturer's technical representatives to roof manufacturer

d. Contractor's plan for coordination of the work of the various trades involved in providing the roofing system and other components secured to the roofing

e. Quality control, (ARMA PMBRG98) plan for the roof system installation

f. Field Inspection and Existing Conditions Report identifying all fire safety issues including exposed or concealed combustible materials, which may require additional protection during roof installation

g. Safety requirements

SECTION 07 52 00 Page 10

Coordinate preroofing conference scheduling with the Contracting Officer.

The conference must be attended by the Contractor, the Contracting Officer's designated personnel, and personnel directly responsible for the installation of roofing and insulation, flashing and sheet metal work, mechanical and electrical work, other trades interfacing with the roof work, designated safety personnel trained to enforce and comply with ASSP A10.24 , Fire Marshall, and a representative of the roofing materials manufacturer. Before beginning roofing work, provide a copy of meeting notes and action items to all attending parties. Note action items requiring resolution prior to start of roof work.

1.5 DELIVERY, STORAGE, AND HANDLING

1.5.1 Delivery

Deliver materials in manufacturers' original unopened containers and rolls with labels intact and legible. Mark and remove wet or damaged materials from the site. Where materials are covered by a referenced specification, the container must bear the specification number, type, and class, as applicable. Labels or bill of lading for roofing asphalt must indicate asphalt type, FP, FBT, and EVT, that is, the temperature at which the viscosity is either 125 centistokes when tested in accordance with ASTM D2170/D2170M or 75 centipoise when tested in accordance with ASTM D4402/D4402M . Deliver materials in sufficient quantity to allow work to proceed without interruption.

1.5.2 Storage

Protect materials against moisture absorption and contamination or other damage. Avoid crushing or crinkling of roll materials. Store roll materials on end on clean raised platforms or pallets one level high in dry locations with adequate ventilation, such as an enclosed building or closed trailer. Do not store roll materials in buildings under construction until concrete, mortar, and plaster work is finished and dry. Maintain roll materials at temperatures above 50 degrees F for 24 hours immediately before application. Do not store materials outdoors unless approved by the Contracting Officer. Completely cover felts stored outdoors, on and off roof, with waterproof canvas protective covering. Do not use polyethylene sheet as a covering. Tie covering securely to pallets to make completely weatherproof. Provide sufficient ventilation to prevent condensation. Do not store more materials on roof than can be installed the same day and remove unused materials at end of each days work. Distribute materials temporarily stored on roof to stay within live load limits of the roof construction.

Maintain a minimum distance of 35 foot for all stored flammable materials, including materials covered with shrink wraps, craft paper or tarps from all torch/welding applications.

Immediately remove wet, contaminated or otherwise damaged or unsuitable materials from the site. Damaged materials may be marked by the Contracting Officer.

1.5.3 Handling

Prevent damage to edges and ends of roll materials. Do not install damaged materials in the work. Select and operate material handling equipment to prevent damage to materials or applied roofing.

SECTION 07 52 00 Page 11

1.6 ENVIRONMENTAL REQUIREMENTS

Do not install roofing system when air temperature is below 40 degrees F, during any form of precipitation, including fog, or when there is ice, frost, moisture, or any other visible dampness on the roof deck. Follow manufacturer's printed instructions for Cold Weather Installation.

1.7 HOT-MOPPED ASPHALT APPLIED MODIFIED BITUMEN MEMBRANE SAFETY

1.7.1 Property Protection

Take all precautions necessary to prevent ignition of combustible materials during hot-mopped asphalt application of roofing. Immediately call the fire department if a fire commences. Review all fire safety procedures as outlined at the pre-roofing conference.

Install materials using the techniques recommended by CERTA NRCA/MRCA Certified Roofing Torch Applicator Program available from the National Roofing Contractors Association (NRCA) and the Midwest Roofing Contractors Association (MRCA) as endorsed by the Asphalt Roofing Manufacturers Association (ARMA) and the United Union of Roofers, Waterproofers and Allied Workers. Application procedures must comply with NFPA 241 , OSHA 29 CFR 1910 and 29 CFR 1910.12 , 29 CFR 1926.16 , 29 CFR 1926 Subpart F., UL Fire Resistance Directory Volume No. 1, NRCA R&W Manual, and Florida Building Code Volume 2004.

Do not store flammable liquids on the roof.

Provide a minimum of two 2.65 gallon containers of water and two fully charged minimum 20 pound CO2 20 pound ABC (dry chemical) fire extinguishers in separate, easily accessible locations on the roof and within 10 foot of each hot-mopped kettle at all times.

No Asphalt Kettles are allowed on roofs. Locate kettles and supply LP-Gas Cylinders safely and secured per NFPA 241 outside of the building's perimeter a minimum of 20 foot from the structure and any combustible materials.

Maintain a minimum separation of 20 foot between LP-Gas Cylinders and kettle. Provide protective fire retardant blanket barrier or shield between any building structure to a minimum height of 8 foot and a clear surround distance of 4 foot if operations force placement of kettle within a distance of 20 foot. Do not obstruct or place kettles or Cylinder storage within 10 foot of exits, means of egress, gates, roadways, entrances. Locate kettles downwind and away from any building air intakes.

Provide a minimum of two portable fully charged 20 pound CO2 (dry chemical) fire extinguishers no closer than 5 foot and no further than 25 foot of horizontal travel distance from each kettle at all times while kettle is in operation, in easily accessible and identifiable locations.

Also provide a minimum of one multipurpose 2-A:20-B:C portable fire extinguisher on the roof being covered or repaired.

Comply with the following safety procedures:

a. Fuel containers, burners, and related appurtenances of roofing equipment in which liquefied petroleum gas is used for heating must comply with the requirements of NFPA 58 .

SECTION 07 52 00 Page 12

b. Fuel containers having capacities greater than one pound must be located a minimum of 10 foot clear distance from the burner flame.

c. Clearly label all LP-Gas Cylinders as "Flammable Gas", and secure to prevent accidental tip-over.

d. Check all pressure regulators and hoses prior to use for proper functioning and integrity.

e. Turn off fuel supply at LP Gas Cylinder when kettle is not in use.

f. Equip all kettles with a functioning temperature measuring device to ensure no heating in excess of 50 degrees F below the flash point.

g. Provide covers, lid, or top which are close fitting, constructed of minimum No.14 manufacturer's gauge steel, and can be gravity closed on all kettles.

h. Clean all roofing mops and rags free of excess asphalt and store safely away from all combustible materials. Store discarded roofing mops and rags in a non-combustible container and remove from site each day.

i. Position all pump lines handling hot asphalt securely and equip all pump lines with a shut-off valve on each with a coupler which may be opened when lines are full. Do not subject pump lines to pressures in excess of safe and recommended NRCA and ARMA working pressures.

Station an operator near the equipment to cut off flow and care for other emergencies while conducting heating, pumping and application operations.

j. Asphalt bucket used by roofers or workers in similar trades must be constructed of minimum No. 24 gauge or heavier sheet steel and have a metal bail of no less than 1/4 inch diameter material. The bail is to be fastened to offset ears or equivalent which have been riveted, welded, or otherwise safely and securely attached to the bucket.

Soldered bail sockets are prohibited. Position workers and other employees to avoid being struck by bucket or other roofing materials, which may accidentally fall while being hoisted, lowered, or used in the roofing operation. Provide safety barriers and caution signs at all skylights or other roof holes.

k. Do not use flammable liquids with a flash point below100 degrees F (gasoline and similar products) for cleaning purposes.

Do not use solid fuel or Class I liquids as fuel for roofing asphalt kettles. Provide a minimum of one employee fully knowledgeable of kettle operations and hazards to maintain constant surveillance during kettle operation within a minimum distance of 25 foot of the kettle.

Check all fire extinguishers prior to commencement of work, and upon completion of the day's work, to ensure fullness and operability.

Project supervisor must make daily inspections with the facility manager of all conditions and operations which could present hazards during hot-mopped applications and issue directives to address all such concerns and items of the work and existing conditions.

Identify and protect all combustible roof components, possible fire traps, SECTION 07 52 00 Page 13 and hidden hazards. Seal off voids or openings in the substrate with non-combustible materials prior to installing hot-mopped applied materials in the area. Install protective fire retardant blankets and shields at building walls, eaves, parapets and equipments curbs constructed of combustible materials within 3 foot radius of the area of hot-mopped kettle prior to commencement of the work.

When working around intakes and openings, temporarily disconnect and block to prevent fumes from kettle from being drawn into the opening.

1.7.2 Fire Watch

All personnel on the roof during hot-mopped application must be properly trained to use a fire extinguisher. Provide a fire watch for a minimum of 30 minutes after completion of hot-mopped kettle operations at the end of each work shift. Maintain the fire watch for additional time required to ensure no potential ignition conditions exist. Utilize heat sensing meters to scan for hot spots in the work. Provide a minimum duration fire watch of two hours conducted by personnel properly trained in the use of the camera to survey the underside of the roof deck, attic, and plenum spaces (where possible) and the topside of possible smoldering elements.

Camera must have a manufacturer's certificate of calibration, and the use of the camera must be in compliance with Installation security policies.

Do not leave the rooftop unattended during breaks in work during a work shift. Walk and scan all areas of application checking for hot spots, fumes, or smoldering, especially at wall and curb areas, prior to departure at the end of each work shift. Ensure any and all suspect conditions are eliminated prior to leaving the site each work shift.

1.7.3 Equipment and Personnel Safety

All crew members must be trained in preventive measures for indirect and direct dangers and hazards associated with roofing work, which include, but are not limited to the following:

a. Heat Stress: Wear light colored clothing, a hat for ultra-violet protection, and other eye protective devices. Drink sufficient quantities of non-alcoholic, non-caffeine liquids. Stage shifts for crew members to allow for breaks from heat and sun exposure without interfering with work progress.

b. First Aid for Burns: Immediately call for an ambulance. Contact local Occupational Health Services (OHS).

All crew members must wear correct personal protective equipment (PPE), including. but not limited to the following items:

a. Long-sleeved shirts buttoned at the collar and cuffs, and must be made of non-flammable materials. Polyester materials are not allowed.

b. Work boots covering ankles with rubber or composite soles.

c. Long pants without cuffs to extend over the top of the work boots, and must be made of non-flammable materials. No polyester allowed.

d. OSHA and ANSI/ISEA Z87.1 approved face shields, goggles and/or safety glasses to be worn during hour work operations and any other applicable roofing functions.

SECTION 07 52 00 Page 14

e. OSHA and ANSI approved hard hats.

1.7.4 Wind Conditions

Use side shields with all torching operations when winds are occurring to prevent flame distortion of end burners. Use torch machine equipment with bottom shield plate to prevent flame spread on to roof deck and substrate. When high wind gusts are present, notify the safety officer and cease all use of torching equipment until wind conditions lower and authorization from the safety officer to proceed is received.

1.8 SEQUENCING

Coordinate the work with other trades to ensure that components which are to be secured to or stripped into the roofing system are available and that permanent flashing and counter flashing, per NRCA CONDET, and are installed as the work progresses. Ensure temporary protection measures are in place to preclude moisture intrusion or damage to installed materials. Apply roofing immediately following application of insulation as a continuous operation. Coordinate roofing operations with insulation work so that all roof insulation applied each day is covered with roof membrane installation the same day.

1.9 WARRANTY

Provide roof system material and workmanship warranties meeting specified requirements. Provide revision or amendment to standard membrane manufacturer warranty as required to comply with the specified requirements. Provide a manufacturer's warranty that has no dollar limit, covers full system water-tightness, and has a minimum duration of 30 years.

1.9.1 Roof Membrane Manufacturer Warranty

Furnish the roof membrane manufacturer's 30-year no dollar limit roof system materials and installation workmanship warranty, including flashing, insulation in compliance with ASTM C1289, and accessories necessary for a watertight roof system construction. Provide one sole source warranty for roof system (30 years)including the edge metal (ANSI SPRI ES-1 CODE) the coating system (10 year finish warranty). A signed letter from the president of the manufacturer stating the roof membrane, edge metal and coatings are products of the manufacturer shall accompany the roof submittal package. No relabeled products from third party manufacturers are acceptable. Provide coverage for damage to the roofing system caused by sustained winds having a velocity of 130 mph or less. Provide warranty directly to the Government and commence warranty effective date at time of Government's acceptance of the roof work. The warranty must state that:

a. If within the warranty period the roof system, as installed for its intended use in the normal climatic and environmental conditions of the facility, becomes non-watertight, shows evidence of moisture intrusion within the assembly, blisters, splits, tears, delaminates, separates at the seams, or shows evidence of excessive weathering due to defective materials or installation workmanship, the repair or replacement of the defective and damaged materials of the roof system assembly and correction of defective workmanship are the responsibility of the roof membrane manufacturer. All costs associated with the repair or replacement work are the responsibility

SECTION 07 52 00 Page 15 of the roof membrane manufacturer.

b. When the manufacturer or his approved applicator fail to perform the repairs within 72 hours of notification, emergency temporary repairs performed by others does not void the warranty.

c. Upon completion of installation, and acceptance by the Contracting Officer and Roofing System Engineer of Record, the manufacturer must supply the appropriate warranty to the Owner.

d. Installer must submit a minimum two year warranty to the membrane manufacturer from the date of acceptance, with a copy to the Contracting Officer and Roofing System Engineer of Record.

1.9.2 Roofing System Installer Warranty

The roof system installer must warrant for a period of two years that the roof system, as installed, is free from defects in installation workmanship, to include the roof membrane, flashing, insulation, accessories, attachments, and sheet metal installation integral to a complete watertight roof system assembly. Write the warranty directly to the Government. The roof system installer is responsible for correction of defective workmanship and replacement of damaged or affected materials. The roof system installer is responsible for all costs associated with the repair or replacement work.

1.9.3 Continuance of Warranty

Repair or replacement work, ARMA 410BUR88, NRCA C3701 that becomes necessary within the warranty period and accomplished in a manner so as to restore the integrity of the roof system assembly and validity of the roof membrane manufacturer warranty for the remainder of the manufacturer warranty period.

1.10 CONFORMANCE AND COMPATIBILITY

Provide the entire roofing and flashing system in accordance with specified and indicated requirements, including fire and wind resistance ( ANSI/SPRI/FM 4435/ES-1 ) requirements. Work not specifically addressed and any deviation from specified requirements must be in general accordance with recommendations of the NRCA Roofing and Waterproofing Manual, membrane manufacturer published recommendations and details, and compatible with surrounding components and construction. Submit any deviation from specified or indicated requirements to the Contracting Officer for approval prior to installation.

PART 2 PRODUCTS

2.1 MATERIALS

Furnish a combination of specified materials that comprise a roof system acceptable to the roof membrane manufacturer and meeting specified requirements. Protect materials provided from defects and make suitable for the service and climatic conditions of the installation.

2.2 MODIFIED BITUMEN SHEETS AND FIBERGLASS FELT MATERIALS

Furnish a combination of specified materials that comprise the modified bitumen manufacturer's standard system of the number and type of plies

SECTION 07 52 00 Page 16 specified. Provide materials suitable for the service and climatic conditions of the installation. Modified bitumen sheets must be watertight and visually free of pinholes, particles of foreign matter, non-dispersed raw material, factory splices, or other conditions that might affect serviceability. Polymer modifier must comply with ARMA PMBRG98 and be uniformly dispersed throughout the sheet. Edges of sheet must be straight and flat.

a. Fiberglass Felt Base Sheet (Concrete deck applications only):

ASTM D4601/D4601M,ASTM D1668/D1668M Type II, as approved by the modified bitumen roof membrane manufacturer.

The reinforced fabric must contain two fibers interwoven, stitched composite polyester/ fiberglass scrim.

Glued composite scrims are not acceptable.

b. SBS Base Sheet:

ASTM D6163/D6163M , Type III , Grade S, minimum 80 mils thick.

Tensile Strength (ASTM D5147): 2 in/min. @ 73.4 +/- 3.6°F MD 100 lbf/in CMD 100 lbf/in; 50 mm/min. @23 +/- deg. C; MD 17.5 kN/m; CMD 17.5kN/m.

Tear Strength (ASTM D5147): 2 in/min. @ 73.4 +/- 3.6° FMD 110 lbf; CMD 100 lbf/in. 50 mm/min. @23 +/- 3 deg. C; MD 489 N; CMD 444 N.

Elongation at Maximum Tensile (ASTM D5147): 2 in/min. @ 73.4 +/- 3.6 Deg. F; FMD 4%; CMD 4%; 50 mm/min @23 +/- 3 deg. C; MD 4%; CMD 4%.

Low Temperature Flexibility (ASTM D5147): Passes -40°F (-40°C).

c. SBS Cap Sheet: ASTM D6162/D6162M ; Type III, Grade G , minimum 170 mils thick, and as required to provide specified fire safety rating. The cap sheet is to contain a minimum 6% recycled content.

Tensile Strength (ASTM D5147): 2 in/min @ 73.4 +/- 3.6 deg. FMD 1000 1bf/in; CMD 1100 bf/in 50 mm/min @ 23 +/- 3 deg. MD 175 N CMD 192.5

KN/M.

Tear Strength (ASTM D5147) 2 in/min @ 73.4 +/- 3.6 deg. FMD 17001bf;

CMD 1800 1bf/in 50 mm/min @ 23 +/- 3 deg. C MD 7561.6N; CMD 8006.4N Elongation at Maximum Tensile (ASTM D5147): 2 in/min @ 73.4 +/- 3.6 deg. F; MD 16.0% CMD 16.0% 50 mm/min @ 23 +/- 3 deg. C MD 16.0% Low Temperature Flexibility (ASTM D 5147): Passes -40 deg. F (-40°C).

2.3 BASE FLASHING MEMBRANE

Membrane manufacturer's standard, minimum two-ply modified bitumen membrane flashing system compatible with the roof membrane specified and as recommended in membrane manufacturer's published literature. Provide flashing membranes that meet or exceed the properties of the material standards specified for the modified bitumen base, interply and cap sheet, except that flashing membrane thickness must be as recommended by the membrane manufacturer. Provide metal clad flashing membrane that complies with ASTM D6298.

All flashings are to be set in modified hot asphalt and consist of one layer of tri-laminate base sheet and finish flashing the same as the mineral cap.

Perform three course repairs on all laps and aluminize. The tri-laminate base sheet shall have the following characteristics.

SECTION 07 52 00 Page 17

All flashings shall have double coated reinforced scrim with the following minimum performance requirements according to ASTM D5147:

The sheet is to contain a minimum of 29% recycled content and be manufactured by the Membrane Roof Manufacturer.

Tensile Strength (ASTM D5147): 2 in/min @ 73.4 +/- 3.6 deg. F MD 315 1bf/in CMD 315 1bf/in.

Tear Strength (ASTM D5147): 2 in/min @ 73.4 +/- 3.6 deg. F MD 550 1bf/in CMD 550 1bf/in

Elongation at Maximum Tensile (ASTM D5147): 2 in/min @ 73.4 +/- 3.6 deg. F MD 5% CMD 5% 50 mm/min @ 23 +/- 3 deg. C MD 5% CMD 5%

2.4 ASPHALT

ASTM D312/D312M, Type III or IV, in accordance with modified bitumen membrane manufacturer requirements and compatible with the slope conditions of the installation for vapor barriers and insulation boards on concrete decks only. SEBS modified hot asphalt to be used on flashing, base, and cap sheets on concrete deck and all other applications unles otherwise noted to have the following characteristics:

Elongation @ 77 degree F (ASTM D412) 750% Min.

Softening point (ASTM D36) 203 degree F - 221 degree F.

2.5 MEMBRANE SURFACING

Provide modified bitumen roof membrane cap sheet with factory-applied granule surfacing of color as selected from membrane manufacturer's standard colors. Provide modified bitumen membrane manufacturer's recommended field-applied protective coating. Coat the entire roof surface with white, reflective coating system to meet or exceed the following:

Base Coat - White Elastomeric Roof Coating: Energy Star, CRRC, Title 24 approved white acrylic roof coating ASTM E 903, C 1549 Reflectance 81%, SRI (Solar Reflective Index) 101.

Top Coat - White Kynar Aquatec Roof Coating: Energy Star, CRRC, Title 24 approved white water based, fluoropolymer-acrylic resin roof coating.

ASTM C 1549 Reflectance 90%, SRI (Solar Reflective Index) 112.

Both the base coat and top coat must be products of the roof membrane manufacturer with the proper paperwork to accompany submittals.

2.6 PRIMER

ASTM D41/D41M, or other primer compatible with the application and as approved in writing by the modified bitumen membrane manufacturer.

SECTION 07 52 00 Page 18

2.7 MODIFIED BITUMEN ROOF CEMENT

ASTM D4586/D4586M , Type II for vertical surfaces, Type I for horizontal surfaces, compatible with the modified bitumen roof membrane and as recommended by the modified bitumen membrane manufacturer.

2.8 CANT AND TAPERED EDGE STRIPS

Provide standard cants and tapered edge strips of perlite conforming to ASTM C728 the same material as the roof insulation or when roof insulation material is not available, provide pressure preservative treated wood, wood fiberboard, or rigid perlite board cants and edge strips as recommended by the manufacturer or wood fiber conforming to ASTM C208 treated with bituminous impregnation, sizing, or waxing and fabricated to provide maximum 45 degree change in direction of membrane. Cant strips must be minimum 5 inch face and 3-1/2 inch vertical height when installed at 45 degree face angle , except where clearance restricts height to lesser dimension. Taper edge strips at a rate of one to 1-1/2 inch per foot to a minimum of 1/8 inch of thickness. Provide kiln-dried preservative-treated wood cants, in compliance with requirements of Section 06 10 00 ROUGH CARPENTRY at base of wood nailers set on edge and wood curbing and where otherwise indicated.

2.9 FASTENERS AND PLATES

Provide coated, corrosion-resistant fasteners as recommended by the modified bitumen sheet manufacturer's printed instructions and meeting the requirements of FM 4470 and FM APP GUIDE for Class I roof deck construction and the wind uplift resistance specified. For fastening of membrane or felts to wood materials, provide fasteners driven through 1 inch diameter metal discs, or one piece composite fasteners with heads not less than 1 inch in diameter or 1 inch square with rounded or 45 degree tapered corners.

2.9.1 Masonry or Concrete Walls and Vertical Surfaces

Use hardened steel nails or screws with flat heads, diamond shaped points, and mechanically deformed shanks not less than 1 inch long for securing felts, modified bitumen sheets, metal items, and accessories to masonry or concrete walls and vertical surfaces. Use power-driven fastenersonly when approved in writing by the Contracting Officer.

2.9.2 Metal Plates

Provide flat corrosion-resistant round stress plates as recommended by the modified bitumen sheet manufacturer's printed instructions and meeting the requirements of FM 4470 ; not less than 2 inch in diameter. Form discs to prevent dishing or cupping.

2.10 PRE-MANUFACTURED ACCESSORIES

Pre-manufactured accessories must be manufacturer's standard for intended purpose, comply with applicable specification section, compatible with the membrane roof system and approved for use by the modified bitumen membrane manufacturer.

2.10.1 Pre-fabricated Curbs

Provide 20 gauge AZ55 galvalume curbs with minimum 4 inch flange for

SECTION 07 52 00 Page 19 attachment to roof nailers. Curbs must be minimum height of 10 inch above the finished roof membrane surface.

2.10.2

2.11 WALKPADS

Provide roof walkpads that are polyester reinforced, granule-surfaced modified bitumen membrane material, minimum197 mils thick, compatible with the modified bitumen sheet roofing and as recommended by the modified bitumen sheet roofing manufacturer. Panels must not exceed 4 foot in length. Other walkpad materials require approval of the Contracting Officer prior to installation.

2.12 PAVER BLOCKS

Precast concrete, minimum 1-1/2 inch thick, minimum 18 inch square for walkways and minimum 6 inch by 12 inch for use in supporting surface bearing components but extending not less than 2 inch beyond all sides of surface bearing bases. Install walkpad material under all paver blocks.

***AMDT0001***

2.13 ROOF INSULATION BELOW MODIFIED BITUMEN MEMBRANE SYSTEM

Provide insulation compatible with the roof membrane, approved by the membrane manufacturer and meeting all the requirements of of ASTM C1289 Polyisocyanurate Boards.

Type II, Class I, Grade 3, 25 psi-minimum. 38 R-Value (Minimum-MOTSU Energy Standard). Tapered or as indicated in other documents.

Fasteners: Provide flush-driven fasteners through flat round or hexagonal steel or plastic plates. Provide zinc-coated steel plates, flat round not less than 35 mm 1 3/8 inch diameter, hexagonal not less than 0.4 mm 28 gage. Provide high-density plastic plates, molded thermoplastic with smooth top surface, reinforcing ribs and not less than 75 mm 3 inches in diameter.

Fully recess fastener head into plastic plate after it is driven. Form plates to prevent dishing. Do not use bell or cup shaped plates. Provide fasteners in accordance with insulation manufacturer's recommendations for holding power when driven, to withstand 130 MPH wind.

***AMDT0001***

2.14 COVER BOARD (Recovery Board)

Cement Roof Board manufactured to conform to ASTM C1325.

Nominal thickness: 1/2 in.

Nominal weight: 2.4 lbs/SF.

Flexural strength (parallel) per ASTM C947: > 750 psi.

Compressive strengths: > 1000 psi.

Flute spanability per ASTM E661: 12 in.

Permeance per ASTM E96: 5.84 perms.

SECTION 07 52 00 Page 20

R Value per ASTM E831: 0.39 .SF.h/BTU.

Water Absorption per ASTM C473: < 0.07% MAX.

Mold resistance per ASTM D3273: 10.

Minimum bending radius: 6 ft.

2.15 ALUMINUM

ANSI-SPRI ES-1.

ASTM B209M ASTM B209 anodized color form alloy and temper appropriate for use.

Alclad 3003 or Alclad 3004, or Alclad 3005, clad on one side.

Finish: Baked-on factory-applied color coating of polyvinylidene fluoride (PVF2) or other equivalent fluorocarbon coating applied after metal substrates have been cleaned and pretreated.

Finish coating dry-film thickness: 0.020 to 0.033 mm 0.8 to 1.3 mils

Color: Match existing building.

2.16 EDGE METAL/FLASHING/GUTTERS/DOWNSPOUTS/FASCIA

Use only aluminum manufactured for the purpose of flashing.

All exposed sheet metal gutters, including hangers, downspouts, gravel stops, and fascias; CAP, valley, steeped, base, and eave flashing, expansion joints,and related accessories must be of the same material.

Furnish sheet metal items in 8 to 10 foot lengths. Single pieces less than 8 feet long may be used to connect to factory -fabricated inside and outside corners, and at ends of runs. Factory fabricate corner pieces with minimum 12 inch legs. Provide all accessories and other items essential to complete the sheet metal installation. Provide accessories made of the same or compatible materials as the items to which they are applied.

Aluminum alloy sheet and plate: ASTM B209M anodized color form alloy, and temper appropriate for use. ALCLAD 3003, ALCLAD 3004, ALCLAD 3005, clad on both sides.

Exposed exterior finish: Baked-on, factory-applied color coating of polyvinylidene fluoride (PVF2) or other equivalent fluorocarbon coating applied after metal substrates have been cleaned and pretreated. Provide finish coating dry-film coating dry-film thickness of 0.020 to 0.033 min.

0.8 to 1.3 mills. Color as selected from standard color wheel.

Aluminum alloy, extruded bars, rods, shapes, and tubes: ASTM B221M and ASTM B221.

Fasteners: Use the same metal or a metal compatible with the item fastened.

Use stainless steel fasteners to fasten dissimilar materials (ASTM A480/A480M, type 302 or 304, 2D finish, fully annealed).

Minimum thickness of 0.025" (22Gage) for: Base course; wall opening heads

SECTION 07 52 00 Page 21 and sills; through wall and spandrel; cap and base flashing; vertical and horizontal surfaces; roof edges, ridges, and hips; crickets, valleys, or gutters; chimney pans; and ledge flashing.

Minimum thickness of 0.032" for: coping widths up to 12".

Minimum thickness of 0.040" for: coping widths above 12".

Minimum thickness of 0.032" for: soffits.

2.16.1 ADHESIVE - HOT

Hot Type III SBS Modified asphalt

2.16.2 AHESIVE - COLD

Cold adhesive is not alternate material to hot applied methods. Use cold adhesive if shown in drawings. Provide membrane manufacturer's recommended low volatile organic compound (VOC) cold process adhesive for application of the membrane plies. Provide moisture-cured, asphalt modified polyester polymer based adhesive. Provide product that will cure in 1 to 5 days maximum depending on climatic conditions. Apply product as recommended by manufacturer, including but not limited to: tools, temperature, coverage rate, etc.)

2.16.2.1 POLYUREA FOR DRAINAGE

Single component alaphatic Polyurea

Tensile Strength (ASTM D 412) 2300 psi

Tear Strength (ASTM D 624) 230 lbs / SF

Wet Film Thickness 32 minimum 32 mils

2.17 Roof Drains and Expansion Joints

Roof drains shall conform to ASME A112.6.4, with dome and integral flange, and shall have a device for making a watertight connection between roofing and flashing. The whole assembly shall be galvanized heavy pattern cast iron. For aggregate surface roofing, the drain shall be provided with a gravel stop. On roofs other than concrete construction, roof drains shall be complete with underdeck clamp, sump receiver, and an extension for the insulation thickness where applicable. A clamping device for attaching flashing or waterproofing membrane to the seepage pan without damaging the flashing or membrane shall be provided when required to suit the building construction. Strainer openings shall have a combined area equal to twice that of the drain outlet. The outlet shall be equipped to make a proper connection to threaded pipe of the same size as the downspout. An expansion joint of proper size to receive the conductor pipe shall be provided. The expansion joint shall consist of a heavy cast-iron housing, brass or bronze sleeve, brass or bronze fastening bolts and nuts, and gaskets or packing. The sleeve shall have a nominal thickness of not less than 0.134 inch. Gaskets and packing shall be close-cell neoprene, O-ring packing shall be close-cell neoprene of 70 duometer. Packing shall be held in place by a packing gland secured with bolts.

SECTION 07 52 00 Page 22

PART 3 EXECUTION

3.1 EXAMINATION

Ensure that the following conditions exist prior to application of the roofing materials:

a. Do not install items that show visual evidence of biological growth.

b. Drains, curbs, cants, control joints, expansion joints, perimeter walls, roof penetrating components, and equipment supports are in place.

c. Surfaces are rigid, clean, dry, smooth, and free from cracks, holes, and sharp changes in elevation. Joints in the substrate are sealed to prevent dripping of bitumen into building or down exterior walls.

d. The plane of the substrate does not vary more than 1/4 inchwithin an area 10 by 10 foot when checked with a10 foot straight edge placed anywhere on the substrate.

e. Substrate is sloped as indicated to provide positive drainage.

f. Walls and vertical surfaces are constructed to receive counter flashing, and will permit mechanical fastening of the base flashing materials.

g. Treated wood nailers are in place on non-nailable surfaces, to permit nailing of base flashing at minimum height of 8 inch above finished roofing surface.

h. Protect all combustible materials and surfaces which may contain concealed combustible or flammable materials. All fire extinguishing equipment has been placed as specified.

i. Verify all Fire Watch personnel assignments.

j. Treated wood nailers are fastened in place at eaves, gable ends, openings, and intersections with vertical surfaces for securing of membrane, edging strips, attachment flanges of sheet metal, and roof fixtures. Embedded nailers are flush with deck surfaces.

Surface-applied nailers are the same thickness as the roof insulation.

k. Cants are securely fastened in place in the angles formed by walls and other…