070150.19 - Preporation for ReRoofing 7-1-2021.pdf

7-1-2021

07 01 50.19 - 1

SECTION 07 01 50.19

PREPARATION FOR RE-ROOFING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Complete roof removal for new roof system installation.

2. Existing roofing membrane preparation for new roofing installation.

B. Existing EPDM Roofing System components include:

1. Roof insulation

2. Roofing membrane.

1.2 RELATED REQUIREMENTS

A. Replacement Wood Blocking: Section 06 10 00, ROUGH CARPENTRY.

B. New Roofing System: Section 07 52 16.11, STYRENE-BUTADIENE-STYRENE

MODIFIED BITUMINOUS MEMBRANE, ROOFING, COLD APPLIED

C. Roof Insulation: Section 072200 Roof and Deck Insulation

D. Sheet Metal Counterflashing: Section 07 60 00, SHEET METAL FLASHING AND

TRIM.

1.3 APPLICABLE PUBLICATIONS

A. Comply with references to extent specified in this section.

B. American Society for Nondestructive Testing (ASNT):

1. SNT-TC-1A - Personnel Qualification and Certification for

Nondestructive Testing.

C. ASTM International (ASTM):

1. C208-12 - Cellulosic Fiber Insulating Board.

2. C578-15 - Rigid, Cellular Polystyrene Thermal Insulation.

3. C728-15 - Perlite Thermal Insulation Board.

4. C1177/C1177M-13 - Glass Mat Gypsum Substrate for Use as Sheathing.

5. C1153-97(2003)e1 - Location of Wet Insulation in Roofing Systems

Using Infrared Imaging.

6. C1278/C1278M-07a(2015) - Fiber-Reinforced Gypsum Panel.

7. D4263-83(2012) - Indicating Moisture in Concrete by the Plastic

Sheet Method.

D. U.S. Department of Commerce National Institute of Standards and

Technology (NIST):

1. DOC PS 1-09 - Structural Plywood.

2. DOC PS 2-04 - Performance Standard for Wood-Based Structural-Use

Panels.

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1.4 PREINSTALLATION MEETINGS

A. Conduct preinstallation meeting minimum 30 days before beginning Work of this section.

1. Required Participants:

a. Contracting Officer's Representative.

b. Contractor.

c. Installer.

d. Manufacturer's field representative.

e. Other installers responsible for adjacent and intersecting work, including mechanical and electrical equipment installers.

2. Meeting Agenda: Distribute agenda to participants minimum 3 days before meeting.

a. Removal and installation schedule.

b. Removal and installation sequence.

c. Preparatory work.

d. Protection before, during, and after installation.

e. Removal and installation.

f. Temporary roofing including daily terminations.

g. Transitions and connections to other work.

h. Inspecting and testing.

i. Other items affecting successful completion.

3. Document and distribute meeting minutes to participants to record decisions affecting installation.

1.5 SUBMITTALS

A. Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Submittal Drawings:

1. Show size, configuration, and installation details.

C. Manufacturer's Literature and Data:

1. Description of each product.

2. Description of temporary roof system and components.

3. List of patching materials.

4. Recover board adhesive requirements.

5. Roofing installation preparation instructions to receive new roofing.

D. Photographs: Document existing conditions potentially affected by roofing operations before work begins.

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1.6 QUALITY ASSURANCE

A. Installer Qualifications:

1. Same installer as Section 07 52 16.11, STYRENE-BUTADIENE-STYRENE

MODIFIED BITUMINOUS MEMBRANE, ROOFING, COLD APPLIED.

1.7 FIELD CONDITIONS

A. Building Occupancy: Perform work to minimize disruption to normal building operations.

1. Verify occupants are evacuated from affected building areas when working on structurally impaired roof decking above occupied areas.

2. Provide notice minimum 72 hours before beginning activities affecting normal building operations.

3. Examine available information before beginning work of this section.

B. Weather Limitations: Proceed with reroofing preparation only during dry weather conditions as specified for new roofing installation in Section

07 52 16.13, STYRENE-BUTADIENE-STYRENE MODIFIED BITUMINOUS MEMBRANE,

ROOFING, COLD APPLIED.

1. Remove only as much roofing in one day as can be made watertight in same day.

C. Hazardous materials are not expected in existing roofing system.

1. Known hazardous materials were removed before start of work.

2. Do not disturb suspected hazardous materials. When discovered, notify Contracting Officer's Representative.

3. Hazardous materials discovered during execution of the work will be removed by Government as work of a separate contract.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Patching Materials: Match existing roofing system materials.

B. Plywood Sheathing: See Section 06 10 00, ROUGH CARPENTRY.

C. Metal Flashing: See Section 07 60 00, SHEET METAL FLASHING AND TRIM.

D. Temporary Protection Materials:

1. Expanded Polystyrene (EPS) Insulation: ASTM C578.

2. Plywood: NIST DOC PS 1, Grade CD Exposure 1.

E. Temporary Roofing System Materials: Modified Bitumen as specified in

Section 07 52 16.11.

F. Recover Board:

1. Insulation: See Section 07 22 00, ROOF AND DECK INSULATION.

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PART 3 - EXECUTION

3.1 EXAMINATION

A. Verify all existing site conditions prior to proceeding with work specified in this Section.

B. Verify that existing roof surface is clear and ready for work of this

Section.

C. Verify that work and operations related to this project, performed by others, is complete prior to proceeding with work specified in this

Section.

3.2 PREPARATION

A. Examine and verify substrate suitability for product installation.

B. Protect existing roofing system indicated to remain.

1. Cover roof membrane with temporary protection materials without impeding drainage.

2. Limit traffic and material storage to protected areas.

3. Maintain temporary protection until replacement roofing is completed.

C. Protect existing construction and completed work from damage.

D. Protect landscaping from damage.

E. Maintain access to existing walkways and adjacent occupied facilities.

F. Coordinate use of rooftop fresh air intakes with Contracting Officer's

Representative to minimize effect on indoor air quality.

G. Ensure temporary protection materials are available for immediate use in case of unexpected rain.

H. Ensure roof drainage remains functional.

1. Keep drainage systems clear of debris.

2. Prevent water from entering building and existing roofing system.

I. Coordinate rooftop utilities remaining active during roofing work with

Contacting Officer's Representative.

3.3 RE-ROOFING PREPARATION - GENERAL

A. Notify Contacting Officer's Representative of planned operations, daily.

1. Identify location and extent of roofing removal.

2. Request authorization to proceed.

3.4 COMPLETE ROOFING SYSTEM REMOVAL

A. Remove existing roofing system completely, exposing structural roof deck.

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1. Remove roof insulation and roof membrane. Remove all membrane, insulation, cant strips, base flashings and items shown on the drawings. Ensure the complete removal of all nails to leave a smooth even surface for re-roofing.

2. All debris dumped from the roof shall be transported from the roof via chutes into dumpsters or trucks, and this debris shall, be removed from the premises when vehicles are full. No debris shall be transported from the area being worked over an existing finished roof without and underlayment of 3/4" plywood.

3. Contractor shall provide tie-ins at the end of each days work.

Prime existing roof surface prior to making tie-ins.

3.5 DECK PREPARATION

A. Inspect structural roof deck after roofing system removal.

B. Concrete Roof Decks:

1. Visually confirm concrete roof deck is dry.

2. Perform moisture test according to ASTM D4263 each day for each separate roof area.

a. Proceed with roofing work only when moisture is not observed.

3.6 TEMPORARY ROOFING

A. Install temporary roofing to maintain building watertight at overnight tie-ins.

B. Remove temporary roofing before installing new roofing.

3.7 EXISTING MEMBRANE PREPARATION FOR NEW ROOFING

A. Remove existing roofing surface projections and irregularities. Produce smooth surface to receive recover boards.

1. Broom clean existing surface.

3.8 BASE FLASHING REMOVAL

A. Remove existing base flashings.

1. Clean substrates to receive new flashings.

B. Replace counterflashings.

1. Counterflashings: See Section 07 60 00 SHEET METAL FLASHING AND

TRIM.

C. Install new pressure-preservative treated wood blocking at edge to accommodate changes in height.

3.9 DISPOSAL

A. Collect waste materials in containers.

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B. Remove waste materials from project site, regularly, to prevent accumulation.

C. Legally dispose of waste materials. All debris dumped from the roof shall be transported from the roof via chutes into dumpsters or trucks, and this debris shall, be removed from the premises when vehicles are full. No debris shall be transported from the area being worked over an existing finished roof without and underlayment of 3/4" plywood.

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3. Document and distribute meeting minutes to participants to record decisions affecting installation.

D. Photographs: Document existing conditions potentially affected by roofing operations before work begins.

I. Coordinate rooftop utilities remaining active during roofing work with Contacting Officer's Representative.

C. Install new pressure-preservative treated wood blocking at edge to accommodate changes in height.