6-ADDENDUM 1 Issued 5-14-26 - MHMS-RHHS .pdf

11720 Beltsville Drive, Suite 600 | Calverton, MD 20705 | 301.595.1000 | grimmandparker.com

CALVERTON, MD | TYSONS, VA | CHARLOTTESVILLE, VA

May 14, 2026

HCPSS ENTRANCE RENOVATIONS @ MURRAY HILL MIDDLE SCHOOL & RIVER HILL HIGH SCHOOL

BID PACKAGE

ADDENDUM NO. 1

22523.01

TO THE CONTRACT DRAWINGS AND SPECIFICATIONS FOR THE REFERENCED PROJECT, DATED APRIL 15, 2026 AS

PREPARED BY GRIMM AND PARKER ARCHITECTS, 11720 BELTSVILLE DRIVE, SUITE 600, CALVERTON, MARYLAND

20705.

This Addendum represents revisions to the 4/15/26 Bid Documents for the Howard County Public School System

Entrance Renovations Project that is currently being bid under Bid #094.26.B4. The following addendum information shall become a binding, integral part of the bid and contract documents. This information shall modify, adjust, clarify, and/or add requirements to the bid and contract documents. The information includes the following:

See attached Bidder RFI Questions and Responses sheet.

SPECIFICATION ITEMS:

ITEM NO. 1: SECTION 0754 19 - POLYVINYL-CHLORIDE (PVC) ROOFING

ADD Section in its entirety

ITEM NO. 2: SECTION 28 31 00 – FIRE DETECTION AND ALARM SYSTEM

REVISE To include Fire Alarm Annunciator panels, see items in BOLD.

DRAWING ITEMS: ARCHITECTURAL

ITEM NO. A1: SHEET A302 DOOR SCHEDULE, FRAME ELEVATIONS, AND DOOR HARDWARE

INFORMATION

REVISE Note on Door Types G-3 to G-2

ADD Title for Storefront Frames

REVISE Numbered Remarks

REVISE Numbered remarks for Doors 158 and 100A

ITEM NO. A2: SHEET A303 FINISH SCHEDULE, INTERIOR MATERIALS SCHEDULE, AND

FINISH FLOOR PLANS

ADD Note to detail H14

REVISE Interior Materials Schedule

DRAWING ITEMS: STRUCTURAL

ITEM NO. S1: SHEET S003 TYPICAL DETAIL

REVISE Drawing title for detail E.

DRAWING ITEMS: TECHNOLOGY

ITEM NO. TE1: SHEET T103M MURRAY HILL TECHNOLOGY PLAN

REVISE Note 5

REVISE Note at clock in room 106

END OF ADDENDUM 1

DRAWING ITEMS: MECHANICAL

ITEM NO. M1: SHEET M201M MURRAY HILL HVAC PLAN

REVISE Note 7

HCPSS MURRAY HILL MS/RIVER HILL HS RENOVATIONS

ADDENDUM #1: BIDDER QUESTIONS AND RESPONSES

QUESTION # QUESTION RESPONSE

ADDENDUM

ITEM #

Please confirm the cost for the PlanGrid/ACC Build license that we will need to purchase per specification 011010.

Reach out to ACC Build, now Autodesk Forma for a quote.

https://www.autodesk.com/collections/architecture-engineering-construction/overview?_gl=1*1ts094*_ga*MTYxNjA1MTQ1Mi4xNzU1MDg2Nj c5*_ga_NZSJ72N6RX*czE3Nzc5ODMxNjUkbzckZzEkdDE3Nzc5ODMxOTUkajMw JGwwJGgw&_ga=2.92178266.1764893687.1777983168- 1616051452.1755086679

N/A

Please confirm for bidding purposes the distance from the existing panel to the temporary 240V outlet specified in 015000-2.9-2.9.4.

There is an electric closet directly across the hall from Temp Admin Option #1. N/A

Please confirm the intent for the floor finish in the area of the existing closet at River Hill HS that becomes part of Vestibule V100 if Alternate 1.B is not accepted; the finish schedule notes flooring in room 100 as ETR but the finish plan shows WOC-1.

Install a portion of new walk-off mat to be integrated into existing. Added note" NOTE: IF ALTERNATE 1.B IS NOT ACCEPTED, INSTALL BASE BID PORTION

OF NEW WOC TO BE INTEGRATED INTO EXISTING WOC."

A2

Please clarify the intent for the floor finish in Classroom 110 at Murray Hill MS if Alternate 2.A is not accepted; A18/AD001M notes a large portion of the floor finish is to be removed as part of the base bid- this room is not listed on the finish schedule, and VCT-1 is shown on the finish plan. Is the strip noted as Alternate #2.A intended to be the base bid work?

Refer to the descriptions in Spec 012300. The base bid includes complete removal of flooring in Room 110 and replacement with new VCT. Alternate #2A includes removal and replacement at the dark gray shaded strip only on

A18/AD001M.

N/A

AD003R and A103R reference HVAC, lighting, power, security, and fire alarm work at River Hill HS, however we could not locate any MEP plans for this school; please clarify if these will be provided.

HVAC, lighting, power, security, and fire alarm work at River Hill HS is found on the architectural drawings.

N/A

The storefronts specification calls for Class 1 clear anodized however the interior finish schedule notes aluminum frames to be painted. Please verify if we are to provide painted storefront for River Hill HS elevation SF-05 and doors 101A, or Class 1 clear anodized.

Revised finish schedule to be clear anodized. A2

Please provide a specification for “security vinyl film” noted at River Hills HS doors 100A per A302.

“security vinyl film” not inlcuded in scope. Note has been removed. A1

Please provide the detail 10/M-202 referenced in Specific Note 7 on M-201. Refer to detail 1 / M202. M1

Please provide information for the roofing contractor referenced in the note on AD002M/A102M.

Murray hill - Sarnfil, 2021-2022 yr installed 20yr install guarantee River Hill - Soprema, installed 2015-2016 yr installed 20 yr install guarantee

N/A

Please provide the height from AFF to underside of the ceiling deck.

Approximate deck heights above finish floor at the work areas at each school per each building’s original design documents are provided below. However, per Specification Section 011010, Item G70, “The Owner/CM cannot & do not guarantee the completeness or accuracy of these existing building documents in any way. As such, any reliance on the information included in these existing site/building design documents is at the bidder’s sole risk.” Thus, the information included in this addendum item is provided as a courtesy only, is relied upon at the bidder’s sole risk, and is not part of the bid or contract documents. Bidders are encouraged to field verify existing conditions. A site visit to each school has already been conducted. Additional site visits may be scheduled with Eileen Lorenz by email at eileen.lorenz@jacobs.com. However, HCPSS must arrange any site visits with each school, which may take 2 or 3 workdays, so we recommend bidders arrange any desired site visits immediately. Bidders are also reminded that per Specification Section 011010, Item G70, the Construction Manager will make the existing building design documents available upon request to any bidder who wishes to review them during the bid period, but these existing building design documents are not part of the Contract Documents and are relied upon at the bidder’s sole risk.

Approximate bottom of steel deck heights above finish floor:

River Hill: Sloped 17’-1 ¼” to 16’-8” Murray Hill MS: 11’-8 1/2"

N/A

Please provide contact information for school EMS/BAS vendor(s).

Johnson Controls: Alan G Shephard (Account Executive, Chesapeake Area) 410-456-2399 cell alan.g.shephard@jci.com

EASI: Jeffrey W. Ashe (President) 443-790-6840 Cell 410-437-3103 Ext.216 j.ashe@easicontrols.com

N/A

12 Please provide glass type called out for 'G-3' on sheet A302. Revise note to G-2 A1

HCPSS MURRAY HILL MS/RIVER HILL HS RENOVATIONS

ADDENDUM #1: BIDDER QUESTIONS AND RESPONSES

QUESTION # QUESTION RESPONSE

ADDENDUM

ITEM #

Please provide the paint colors for finishes “PTD-1” and “PTD-2” referenced in the Interior Material Schedule on Sheet A303.

To be determined during construction from manufacturer's full range per 099123.2.1.B.

N/A

Please confirm the project classification, anticipated contract duration, permitted working hours, and any applicable liquidated damages for this solicitation?

Refer to Specification Section 013213 and Attachment A of that specification. N/A

Please clarify how the MBE participation goal should be allocated and documented for each individual package within our bid submission.

Refer to Specification Section 000730 and Attachments A, B, C, D, E, F, & G of that specification.

N/A

Please clarify what other concurrent work activities or projects are expected to be taking place within the same work area during the execution of this project.

We are not aware of any other projects that will be concurrently occupying the same limits of work.

N/A

Please confirm whether a temporary administrative office area will be established at River Hill High School during the work, and if so, where it will be located?

The office will remain occupied in the current space. Provide temporary partitions as needed per Specifications 015000 and 011010.

N/A

Is there a projected schedule for these jobs? Projected boots on the ground schedule?

See response to Question #14. N/A

Will a shutdown be required for tying into the chilled water system at Murray Hill?

A shutdown will likely be required. Refer to Item G12 in the Scope of Work 011010.

N/A

Is there glycol in the chilled water system? If so, What is the plan for draining and re-introduction of the glycol? Its hard to bid a price with out knowing how much glycol will be drained or re-introduced if its required

According to the existing drawings, there does not appear to be any glycol. N/A

For the true Grimm and Parker style for flush doors it says match existing.

Can you provide what the veneer is for the wood doors at these schools?

Existing doors were able to be seen at the pre-bid walk through. We do not have exact information, match existing in the field as noted on the drawings.

N/A

Please confirm the finish for the storefront door & frame is to be Clear Anodized per the 084113 specification. *There is conflicting information on "Interior Material Schedule" on A303.

See response to Question #6. A2

What is Glass Type G-3? It's listed on A302, Note: 3. under the Door Types.

But the specs and glazing schedule only lists Glass Types G-1 & G-2.

See response to Question #12. A1

Please confirm "SF05" is to be an aluminum storefront door and frame. It's list under the "Hollow Metal Frame Types", but the door is clearly called out as an aluminum door on the door schedule.

Yes, SF05 is a storefront Frame. Added title to note Storefront. A1

Please confirm door #158 is existing, and does not require a new glass lite Door 158 is a new SCWD in an existing HM frame. Added remark to schedule. A1

G+P Project No. 22523.01 ENTRANCE RENOVATIONS © Grimm and Parker Architecture, Inc. HOWARD COUNTY PUBLIC SCHOOL SYSTEM

POLYVINYL-CHLORIDE (PVC) ROOFING

07 54 19 - 1

SECTION 07 54 19 - POLYVINYL-CHLORIDE (PVC) ROOFING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Repair and patching of existing adhered polyvinyl chloride (PVC) roofing system where new penetrations are occuring.

2. Roof insulation.

3. Cover board.

4. Walkways.

B. Wood Nailers: Refer to Division 6.

1.2 DEFINITIONS

A. Roofing Terminology: Definitions in ASTM D1079 and glossary in NRCA's "The NRCA Roofing Manual: Membrane Roof Systems" apply to work of this Section.

1.3 PREINSTALLATION MEETINGS

A. Preinstallation Roofing Conference: Conduct conference at project site.

1. Meet with Owner, Architect, Construction Manager, Owner's insurer if applicable, testing and inspecting agency representative, roofing Installer, roofing system manufacturer's representative, deck Installer, air barrier Installer, and installers whose work interfaces with or affects roofing, including installers of roof accessories and roof-mounted equipment.

2. Review methods and procedures related to roofing installation, including manufacturer's written instructions.

3. Review and finalize construction schedule, and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

4. Examine deck substrate conditions and finishes for compliance with requirements, including flatness and fastening.

5. Review structural loading limitations of roof deck during and after roofing.

6. Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that affects roofing system.

7. Review governing regulations and requirements for insurance and certificates if applicable.

8. Review temporary protection requirements for roofing system during and after installation.

9. Review roof observation and repair procedures after roofing installation.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of product.

1. Copies of specification; if deviations from Contract Specifications are required by the roofing system manufacturer, clearly indicate such deviations.

B. Shop Drawings: Include dimensioned roof plans, sections, details, and attachments to other work; indicate joint or termination detail conditions, conditions of interface with other materials, setting plan for tapered insulation layout.

1. Outline of roof areas with dimensions.

2. Layout and thickness of insulation.

3. Base flashings and membrane terminations.

4. Flashing details at penetrations.

5. Plan locations and profile details of flashing methods for penetrations and terminations.

07 54 19 - 2

6. Typical and special details, including those that differ greatly from the published documents.

7. Tapered insulation thickness and slopes; high and low elevations, drain locations, etc.

8. Insulation fastening patterns for corner, perimeter, and field-of-roof locations.

9. Tie-in with air barrier.

10. Technical acceptance from roofing system manufacturer to maintain existing warranty.

1.5 INFORMATIONAL SUBMITTALS

A. Qualification Data: For Installer and manufacturer.

B. Manufacturer Certificates:

1. Performance Requirement Certificate: Signed by roof membrane manufacturer, certifying that roofing system complies with requirements specified in "Performance Requirements" Article.

a. Submit evidence of compliance with performance requirements.

b. Product Test Reports: Based on evaluation of comprehensive tests performed by manufacturer and witnessed by a qualified testing agency, for components of roofing system.

c. Research/Evaluation Reports: For components of membrane roofing system.

2. Special Warranty Certificate: Signed by roof membrane manufacturer, certifying that all materials supplied under this Section are acceptable for maintaining existing warranty.

C. Product Test Reports: For roof membrane and insulation, tests performed by independent qualified testing agency indicating compliance with specified requirements.

D. Evaluation Reports: For components of roofing system, from ICC-ES.

E. Field Quality-Control Reports: Indicate procedures followed, ambient temperatures, humidity, wind velocity during application, and supplementary instructions given.

F. Sample Warranties: For manufacturer's special warranties.

G. Emergency Response Plan:

1. Any damage to the building caused by the Work, leaks or accidents must be addressed immediately by the Contractor as an emergency.

2. The Contractor must respond to leaks or problems at the site during construction with a repair crew within three hours of phone notification.

3. Provide a complete emergency telephone list for at least three responsible company representatives that will be on call during the course of the Project; include cell phone numbers, pager numbers and home phone numbers.

4. Designate one emergency contact in writing to Owner on a weekly basis.

1.6 CLOSEOUT SUBMITTALS

A. Maintenance Data: For roofing system to include in maintenance manuals.

B. Certified statement from existing roof membrane manufacturer stating that existing roof warranty has not been affected by Work performed under this Section.

1.7 QUALITY ASSURANCE

A. Manufacturer Qualifications: A qualified manufacturer specializing in manufacturing the products specified in this section with minimum 20 years of documented experience.

B. Installer Qualifications:

1. A qualified firm that is approved, authorized, or licensed by roofing system manufacturer to install manufacturer's product and that is eligible to receive manufacturer's special warranty.

a. Firm experienced in installation of system to be provided for this Project.

07 54 19 - 3

b. Firm having successful completion of minimum 5 projects of comparable scale and complexity within three years of bid date, with same roofing manufacturer proposed for this Project.

c. Firm having adequate number of skilled workmen experienced with the specified requirements and the methods needed for proper performance of the work in this section.

2. Maintain full-time supervisor/foreman, not workman/foreman, on job site during times that roofing work is in progress. Supervisor must have minimum of three years’ experience in roofing work comparable to scale and complexity of this project.

a. Installer must have a repair crew or shall contract with a repair crew within a 100 mile radius of the project.

C. Installer Certification:

1. Installer must be certified by the manufacturer providing product for this project, within that manufacturer’s quality or training program listed below:

a. Sarnifil Registered Contractor; Sika Sarnifil.

D. Source Limitations:

1. Obtain components for membrane roofing system from roofing membrane manufacturer.

2. Obtain roof system components through sources acceptable to roofing manufacturer providing total system warranty. Provide a letter, on the roofing manufacturer's letterhead and signed by representative of the roofing manufacturer, accepting the products selected by the installer.

E. Should there be any deviation from the Contract Documents without the prior written consent of the roofing material manufacturer and the Architect; the Contractor must do all necessary corrective work to make the roof acceptable to the Architect at no additional cost to the Owner.

F. Provide a part- time factory trained technician on the Project that is a full-time employee of the manufacturer or an independent roofing consultant employed by the Contractor. Each day that production is being performed, the technical inspector must be on the project for a minimum of four hours.

1. Under the Contractor's option to hire an independent roofing consultant, the consultant must have minimum 5 years’ experience as an independent consultant.

2. Independent consultant cannot be an employee of any other roofing company or have been an employee of this roofing installer in the past.

1.8 DELIVERY, STORAGE, AND HANDLING

A. Deliver roofing materials to Project site in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, approval or listing agency markings, and directions for storing and mixing with other components.

B. Store liquid materials in their original undamaged containers in a clean, dry, protected location and within the temperature range required by roofing system manufacturer. Protect stored liquid material from direct sunlight.

1. Discard and legally dispose of liquid material that cannot be applied within its stated shelf life.

C. Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Store in a dry location. Comply with insulation manufacturer's written instructions for handling, storing, and protecting during installation.

D. Handle and store roofing materials, and place equipment in a manner to avoid permanent deflection of deck.

07 54 19 - 4

1.9 FIELD CONDITIONS

A. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit roofing system to be installed according to manufacturer's written instructions and warranty requirements.

B. The installer shall take care during application and storage that overloading of the deck and structure does not occur.

C. Arrange work sequence to avoid use of newly constructed roofing for storage, walking surface, and equipment movement. Where such access is absolutely required, the installer must provide all necessary protection and barriers to segregate the work area and to prevent damage to adjacent areas in accordance with roofing system manufacturer's recommendations.

D. Prior to and during applications, all dirt, debris and dust must be removed from surfaces either by vacuuming, sweeping, blowing with compressed air and/or similar methods.

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

F. Contaminants, such as petroleum products, acids, grease, fats, oils, and solvents must not be allowed to come into contact with the roofing membrane; any such contact must be reported to roofing system manufacturer's representative.

G. Contractor must verify that all roof drain lines are unblocked before starting work; report any blockages to the Architect immediately.

H. All landscaped areas damaged by construction activities shall be raked clean and restored to original condition.

1.10 WARRANTY

A. Special Warranty: Manufacturer agrees to repair or replace components of roofing system that fail in materials or workmanship within specified warranty period.

1. Special warranty includes roof membrane, base flashings, membrane accessories, roof insulation, fasteners, cover boards, and other components of roofing system; include perimeter metal, metal trim and expansion joints.

2. Warranty Period: Existing warranty is to remain in effect at the completion of this project.

a. Copy of existing warranty follows this section for reference.

B. Special Project Warranty: Submit roofing Installer's warranty, on warranty form at end of this Section, signed by Installer, covering the Work of this Section, including all components of roofing system such as roof membrane, base flashing, roof insulation, fasteners, cover boards, and walkway products, for the following warranty period; include perimeter metal, metal trim and expansion joints.

1. Warranty Period: Two years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General Performance: Installed roofing and base flashings shall withstand specified uplift pressures, thermally induced movement, and exposure to weather without failure due to defective manufacture, fabrication, installation, or other defects in construction. Roof system and flashings shall remain watertight.

1. Accelerated Weathering: Roof membrane shall withstand 2000 hours of exposure when tested according to ASTM G152, ASTM G154, or ASTM G155.

2. Impact Resistance: Roof membrane shall resist impact damage when tested according to ASTM D3746, ASTM D4272/D4272M, or the "Resistance to Foot Traffic Test" in FM Approvals 4470.

07 54 19 - 5

B. Material Compatibility: Roofing materials shall be compatible with one another and adjacent materials under conditions of service and application required, as demonstrated by roof membrane manufacturer based on testing and field experience.

C. ENERGY STAR Listing: Roofing system shall be listed on the DOE's ENERGY STAR "Roof Products Qualified Product List" for low -slope roof products.

D. Exterior Fire-Test Exposure: ASTM E108 or UL 790, Class A; for application and roof slopes indicated; testing by a qualified testing agency. Identify products with appropriate markings of applicable testing agency.

E. Fire-Resistance Ratings: Comply with fire-resistance-rated assembly designs indicated. Identify products with appropriate markings of applicable testing agency.

2.2 POLYVINYL CHLORIDE (PVC) ROOFING

A. PVC Sheet: ASTM D4434/D4434M, Type II, fabric reinforced.

B. Manufacturers: provide the following:

1. Sika Sarnafil :

a. To match existing: 60 mils (0.060 inch) G410 on glass mat faced gypsum panels.

C. Source Limitations: Obtain components for roofing system from roof membrane manufacturer or manufacturers approved by roof membrane manufacturer.

2.3 AUXILIARY ROOFING MATERIALS

A. General: Auxiliary materials recommended by roofing system manufacturer for intended use and compatible with other roofing components.

B. Sheet Flashing: Manufacturer's standard sheet flashing of same material, type, reinforcement, and color as PVC sheet.

1. Thickness: 60 mils (0.060 inch), minimum.

C. Base Flashing: Provide waterproof, fully adhered base flashing system at all penetrations, plane transitions, and terminations.

1. Thickness: 60 mils (0.060 inch), minimum; preformed corner and T accessories to be as indicated under accessories.

D. Prefabricated Flashing Accessories:

1. Corners and Seams: Same material as membrane, in manufacturer's standard thicknesses.

a. PVC Inside Corners; 80 mils (0.080 inch) thick.

b. PVC Outside Corners; 80 mils (0.080 inch) thick.

c. PVC T-Joint Covers; 60 mils (0.060 inch) thick, 4-1/2 inch diameter.

2. Penetrations: Same material as membrane, with manufacturer's standard cut-outs, rigid inserts, clamping rings, and flanges.

a. PVC Molded Pipe Flashings; for pipes 1 inch to 6 inches in diameter.

b. PVC Split Pipe Seals; for pipes 1 inch to 6 inches in diameter.

c. PVC Square Tubing Wraps. 3 inches, 4 inches, and 6 inches square.

d. PVC Molded Sealant Pockets. 6 inches by 7-1/2 inches oval; in white membrane only.

E. Roof Vents: As recommended by roof membrane manufacturer.

1. Size: Not less than 4-inch diameter.

F. Bonding Adhesive: Match existing, Sarnacol 2170 VC.

http://www.specagent.com/Lookup?uid=123457147021

07 54 19 - 6

G. Water-Based, Fabric-Backed Membrane Adhesive: Roofing system manufacturer's standard water-based, cold-applied adhesive formulated for compatibility and use with fabric-backed membrane roofing.

H. Low-Rise, Urethane, Fabric-Backed Membrane Adhesive: Roof system manufacturer's standard spray-applied, low-rise, two-component urethane adhesive formulated for compatibility and use with fabric-backed membrane roofing.

I. Metal Termination Bars: Manufacturer's standard, predrilled stainless steel or aluminum bars, approximately 1 by 1/8 inch thick; with anchors.

J. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Approvals 4470, designed for fastening roofing components to substrate, and acceptable to roofing system manufacturer.

K. Miscellaneous Accessories: Provide pourable sealers, preformed cone and vent sheet flashings, preformed inside and outside corner sheet flashings, T-joint covers, lap sealants, termination reglets, and other accessories.

2.4 ROOF INSULATION

A. General: Preformed roof insulation boards manufactured or approved by PVC roof membrane manufacturer.

B. Insulation Performance Across Roof Areas: U = 0.032 or better, using LTTR values; taper to drain cannot be less than 1-inch below minimum insulation thickness determined by performance requirement.

C. Polyisocyanurate Board Insulation: ASTM C1289, Type II, Class 2, Grade 2, felt or glass-fiber mat facer on both major surfaces.

1. Compressive Strength: 20 psi.

2. Size: 48 by 48 inches.

3. Thickness: 3 inches in two layers to match existing.

D. Tapered Insulation: Provide factory-tapered insulation boards.

1. Material: Match roof insulation.

2. Minimum Thickness: 1/4 inch.

3. Slope:

a. Roof Field: 1/4 inch per foot unless otherwise indicated on Drawings.

b. Saddles and Crickets: 1/2 inch per foot unless otherwise indicated on Drawings.

4. Fabrication of Tapered Insulation:

a. Factory pre-cut boards not to exceed 4' x 4' with top surface cut to provide a continuous slope indicated on Drawings.

b. Tapered insulation exceeding 4 inches shall be in two layers, to include starter and filler blocks fabricated to assure staggering of all vertical joints both ways between layers.

c. All miters shall be factory cut, consisting of two diagonally cut abutting blocks with matching edges and thickness.

d. Each piece shall be identified in accordance with reviewed shop drawings.

2.5 INSULATION ACCESSORIES

A. General: Roof insulation accessories recommended by insulation manufacturer for intended use and compatibility with other roofing system components.

B. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Approvals 4470, designed for fastening roof insulation to substrate, and acceptable to roofing system manufacturer.

1. The same brand fastener is to be used throughout the Work.

07 54 19 - 7

2. Number of fasteners and layout must be as recommended by the manufacturer and as per engineered wind uplift resistance design.

3. Length of fastener to vary with the thickness of the insulation.

a. Fasteners must be of appropriate length to achieve a consistent 1-inch penetration in areas of exposed metal deck; Contractor will be required to cut exposed fasteners of obvious varied lengths.

b. Fasteners in areas of cellular roof deck or roof decks with dovetail flute design must be of length to remain concealed in design of steel deck; exposed fasteners in these areas will not be permitted.

C. Surface Conditioner for Adhesives: Compatible with membrane and adhesives.

D. Cover Board: ASTM C1177/C1177M, glass-mat, water-resistant gypsum board or ASTM C1278/C1278M fiber-reinforced gypsum board.

1. Products: Subject to compliance with requirements, provide one of the following:

a. Georgia-Pacific Gypsum LLC; Dens Deck Prime.

b. National Gypsum Company; DEXcell FA Glass Mat Roof Board.

c. USG Corporation; Securock Glass Mat Roof Board.

2. Thickness: 1/2 inch.

3. Surface Finish: Factory primed.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements and other conditions affecting performance of the Work.

1. Verify that roof openings and penetrations are in place, curbs are set and braced, and roof-drain bodies are securely clamped in place.

2. Verify that wood blocking, curbs, and nailers are securely anchored to roof deck at penetrations and terminations and that nailers match thicknesses of insulation.

3. Verify that surface plane flatness and fastening of steel roof deck complies with requirements in Section 05 31 00 "Steel Decking."

B. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 STANDARDS FOR INSTALLATION OF FULLY ADHERED MEMBRANE

A. Manufacturer’s requirements and recommendations shall be followed in all respects for installation of membrane materials. In addition to membrane manufacturer’s requirements, the following standards and remedial actions are specified for installation of membrane materials as part of the work:

B. Miscellaneous Mechanical Fasteners: Mechanical fasteners for securing insulation to roof decking shall in all cases be driven tight. Loose, overdriven, or backed-out fasteners will not be acceptable. If a straightedge is placed over a fastener and that fastener is greater than 1/8-inch above the surface of the surrounding membrane, that fastener shall be considered to be backed out. Loose, overdriven, or backed-out fasteners will be repaired in accordance with specification TS 18 in the ARMA/NRCA/SPRI Repair Manual for Low-Slope Roof Systems.

Each such repair shall be considered a patch.

C. Field Lap Seams: Field lap seams and/or seam cover tape shall be installed along straight lines. A four foot straightedge shall be placed along any given section of lap seam or seam cover tape; a variance of more than ¼-inch in either direction, or a total of ¼-inch in both directions, shall constitute failure to meet the standards of good workmanship. Sections of membrane with seams not complying with this standard shall be removed and replaced.

D. Wrinkles in Membrane: Field membrane shall be adhered with a minimum of wrinkling.

Wrinkles greater than 24 inches in length, or groups of wrinkles which contain a total of 30 http://www.specagent.com/Lookup?ulid=5112 http://www.specagent.com/Lookup?uid=123457147076 http://www.specagent.com/Lookup?uid=123457147078 http://www.specagent.com/Lookup?uid=123457147080

07 54 19 - 8 inches, shall constitute failure to meet the standards of good workmanship. Wrinkles not complying with this standard shall be repaired in accordance with specification TS 7 in the ARMA/NRCA/SPRI Repair Manual for Low-Slope Roof Systems. Each such repair shall be considered a patch.

E. Cuts and Holes: All cuts and holes in the membrane shall be repaired in accordance with specification TS 3 or 5, as applicable, in the ARMA/NRCA/SPRI Repair Manual for Low-Slope Roof Systems. Each such repair shall be considered a patch.

F. Replacement of Deficient Field Membrane: Areas of roof membrane containing more than 3 patches in any area of 100 square feet shall be considered defective and shall be removed and replaced at the direction of the Architect.

3.3 PREPARATION

A. Clean substrate of dust, debris, moisture, and other substances detrimental to roofing system installation according to roofing system manufacturer's written instructions. Remove sharp projections.

B. Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto surfaces of other construction. Remove roof-drain plugs when no work is taking place or when rain is forecast.

3.4 INSTALLATION OF ROOFING, GENERAL

A. Install roofing system according to roofing system manufacturer's written instructions.

B. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system at end of workday or when rain is forecast.

Remove and discard temporary seals before beginning work on adjoining roofing.

C. Wood Nailers:

1. Nailers shall be anchored to resist a minimum force of 300 pounds per lineal foot in any direction. Fastener spacing shall be a maximum of 3 feet on center. Fasteners shall be installed within 6 inches of each end. Spacing and fastener embedment shall conform to Factory Mutual Loss Prevention Data Sheet 1-49.

2. Allow a 1/2 inch open space between adjacent lengths of nailers.

3. Thickness shall be as required to match substrate or insulation height.

4. Woodwork that is questionable must be removed and replaced with suitable new materials.

3.5 INSTALLATION OF INSULATION

A. Coordinate installing roofing system components so insulation is not exposed to precipitation or left exposed at end of workday.

B. Comply with roofing system and insulation manufacturer's written instructions for installing roof insulation.

C. Installation Over Metal Decking:

1. Install base layer of insulation with joints staggered not less than 24 inches in adjacent rows.

a. Locate end joints over crests of decking.

b. Trim insulation neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks.

c. Make joints between adjacent insulation boards not more than 1/4 inch in width.

d. At internal roof drains, slope insulation to create a square drain sump with each side equal to the diameter of the drain bowl plus 24 inches.

1) Trim insulation so that water flow is unrestricted.

e. Fill gaps exceeding 1/4 inch with insulation.

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f. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations.

g. Mechanically attach base layer of insulation using mechanical fasteners specifically designed and sized for fastening specified board-type roof insulation to metal decks.

1) Fasten insulation to resist specified uplift pressure at corners, perimeter, and field of roof.

2) Fasteners in areas of cellular roof deck or roof decks with dovetail flute design must be of length to remain concealed in design of steel deck;

exposed fasteners in these areas will not be permitted.

2. Install upper layers of insulation and tapered insulation with joints of each layer offset not less than 12 inches from previous layer of insulation.

a. Staggered end joints within each layer not less than 24 inches in adjacent rows.

b. Trim insulation neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks.

c. Make joints between adjacent insulation boards not more than 1/4 inch in width.

d. At internal roof drains, slope insulation to create a square drain sump with each side equal to the diameter of the drain bowl plus 24 inches.

e. Trim insulation so that water flow is unrestricted.

f. Fill gaps exceeding 1/4 inch with insulation.

g. Cut and fit insulation within 1/4 inch of nailers, projections, and penetrations.

h. Adhere each layer of insulation to substrate using adhesive.

3.6 INSTALLATION OF COVER BOARDS

A. Install cover boards over insulation with long joints in continuous straight lines with end joints staggered between rows. Offset joints of insulation below a minimum of 6 inches in each direction.

1. Trim cover board neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks.

2. At internal roof drains, conform to slope of drain sump.

a. Trim cover board so that water flow is unrestricted.

3. Cut and fit cover board tight to nailers, projections, and penetrations.

4. Adhere cover board to substrate using adhesive according to approved submittals.

3.7 INSTALLATION OF ADHERED ROOF MEMBRANE

A. Adhere roof membrane over area to receive roofing according to roofing system manufacturer's written instructions.

B. Start installation of roofing membrane in presence of membrane roofing system manufacturer's technician or independent consultant.

C. Unroll roof membrane and allow to relax before installing.

D. Start installation of roofing in presence of roofing system manufacturer's technical personnel.

E. Accurately align roof membrane, and maintain uniform side and end laps of minimum dimensions required by manufacturer. Stagger end laps.

F. Bonding Adhesive: Apply to substrate and underside of roof membrane at rate required by manufacturer, and allow to partially dry before installing roof membrane. Do not apply to splice area of roof membrane.

G. Fabric-Backed Roof Membrane Adhesive: Apply to substrate at rate required by manufacturer, and install fabric-backed roof membrane.

H. In addition to adhering, mechanically fasten roof membrane securely at terminations, penetrations, and perimeter of roofing.

I. Apply roof membrane with side laps shingled with slope of roof deck where possible.

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J. Seams: Clean seam areas, overlap roofing, and hot-air weld side and end laps of roof membrane and sheet flashings to ensure a watertight seam installation.

1. Test lap edges with probe to verify seam weld continuity. Apply lap sealant to seal cut edges of roof membrane and sheet flashings.

2. Verify field strength of seams a minimum of twice daily, and repair seam sample areas.

3. Repair tears, voids, and lapped seams in roof membrane that do not comply with requirements.

K. Spread sealant bed over deck-drain flange at roof drains, and securely seal roof membrane in place with clamping ring.

L. Perimeter Metal Work including Expansion Joints:

1. Complete all metalwork in conjunction with roofing and flashings so that a watertight condition exists daily.

2. Metal shall be installed to provide adequate resistance to bending and to allow for normal thermal expansion and contraction.

3. Metal joints shall be watertight.

3.8 INSTALLATION OF BASE FLASHING

A. Install sheet flashings and preformed flashing accessories, and adhere to substrates according to roofing system manufacturer's written instructions.

B. Apply bonding adhesive to substrate and underside of sheet flashing at required rate, and allow to partially dry. Do not apply to seam area of flashing.

C. Flash penetrations and field-formed inside and outside corners with cured or uncured sheet flashing.

D. Clean seam areas, overlap, and firmly roll sheet flashings into the adhesive. Hot-air weld side and end laps to ensure a watertight seam installation.

E. Terminate and seal top of sheet flashings and mechanically anchor to substrate through termination bars.

3.9 INSTALLATION OF WALKWAYS

A. Flexible Walkways: Install walkway products according to manufacturer's written instructions.

1. Install flexible walkways at the following locations:

a. Perimeter of each rooftop unit.

b. Between each rooftop unit location, creating a continuous path connecting rooftop unit locations.

c. Between each roof hatch and each rooftop unit location or path connecting rooftop unit locations.

d. Top and bottom of each roof access ladder.

e. Between each roof access ladder and each rooftop unit location or path connecting rooftop unit locations.

f. Locations indicated on Drawings.

g. As required by roof membrane manufacturer's warranty requirements.

2. Provide 6-inch clearance between adjoining pads.

3. Heat weld to substrate or adhere walkway products to substrate with compatible adhesive according to roofing system manufacturer's written instructions.

3.10 FIELD QUALITY CONTROL

A. Manufacturer Inspection Service:

1. Keep the Architect and Owner informed as to the progress and quality of the Work as observed.

2. Provide job site inspections:

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a. Refer to Quality Assurance subsection of this section.

b. Provide a written report when onsite indicating the exact hours present.

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

B. Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation on completion, in presence of Architect, and to prepare inspection report.

1. Notify Architect or Owner 48 hours in advance of date and time of inspection.

2. There will be no deviation from this Section, without prior written consent of the Architect and manufacturer, who will have the option of refusing to accept the installation.

3. Confirm that the manufacturer has observed no application procedures in conflict with the specifications other than those that may have been previously reported and corrected.

4. Repair of Deficiencies: Installations or details noted as deficient during Final Inspection must be repaired and corrected by applicator, and made ready for reinspection, within five working days.

5. Warranty will be issued upon approval of the installation.

C. Repair or remove and replace components of roofing system where inspections indicate that they do not comply with specified requirements.

D. Additional testing and inspecting, at Contractor's expense, will be performed to determine if replaced or additional work complies with specified requirements.

3.11 PROTECTING AND CLEANING

A. Protect roofing system from damage and wear during remainder of construction period. When remaining construction does not affect or endanger roofing, inspect roofing system for deterioration and damage, describing its nature and extent in a written report, with copies to Architect and Owner.

B. Where traffic must continue over finished roof membrane, protect surfaces using durable materials.

1. Permit free drainage.

2. Round all edges and corners of wood bearing on roof surface.

3. Receive review and approval of manufacturer’s technician or independent consultant before any traffic is permitted over roofing.

C. Inspect roofing for deterioration and damage, describing its nature and extent in a written report copied to Architect and Owner, at removal of protection.

D. Correct deficiencies in or remove roofing system that does not comply with requirements, repair substrates, and repair or reinstall roofing system to a condition free of damage and deterioration at time of Substantial Completion and according to warranty requirements.

E. Clean overspray and spillage from adjacent construction using cleaning agents and procedures recommended by manufacturer of affected construction.

F. Clean roofing membrane to restore 90 percent of published initial reflectivity; either remove pre-applied protective film or pressure wash membrane as allowed by manufacturer.

G. Protection of Property:

1. Provide protection of property during course of roofing Work.

2. Protect lawns, shrubbery, paved areas, and building from damage; necessary repair of damages will be at no extra cost to Owner.

3.12 ROOFING INSTALLER'S WARRANTY

A. WHEREAS _______________________________ of ___________________________, herein called the "Roofing Installer," has performed roofing and associated work ("work") on the following project:

1. Owner: <Insert name of Owner>.

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2. Address: <Insert address>.

3. Building Name/Type: <Insert information>.

4. Address: <Insert address>.

5. Area of Work: <Insert information>.

6. Acceptance Date: _________________.

7. Warranty Period: <Insert time>.

8. Expiration Date: __________________.

B. AND WHEREAS Roofing Installer has contracted (either directly with Owner or indirectly as a subcontractor) to warrant said work against leaks and faulty or defective materials and workmanship for designated Warranty Period, C. NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that during Warranty Period Roofing Installer will, at Roofing Installer's own cost and expense, make or cause to be made such repairs to or replacements of said work as are necessary to correct faulty and defective work and as are necessary to maintain said work in a watertight condition.

D. This Warranty is made subject to the following terms and conditions:

1. Specifically excluded from this Warranty are damages to work and other parts of the building, and to building contents, caused by:

a. lightning;

b. peak gust wind speed exceeding 74 mph;

c. fire;

d. failure of roofing system substrate, including cracking, settlement, excessive deflection, deterioration, and decomposition;

e. faulty construction of parapet walls, copings, chimneys, skylights, vents, equipment supports, and other edge conditions and penetrations of the work;

f. vapor condensation on bottom of roofing; and

g. activity on roofing by others, including construction contractors, maintenance personnel, other persons, and animals, whether authorized or unauthorized by Owner.

2. When work has been damaged by any of foregoing causes, Warranty shall be null and void until such damage has been repaired by Roofing Installer and until cost and expense thereof have been paid by Owner or by another responsible party so designated.

3. Roofing Installer is responsible for damage to work covered by this Warranty but is not liable for consequential damages to building or building contents resulting from leaks or faults or defects of work.

4. During Warranty Period, if Owner allows alteration of work by anyone other than Roofing Installer, including cutting, patching, and maintenance in connection with penetrations, attachment of other work, and positioning of anything on roof, this Warranty shall become null and void on date of said alterations, but only to the extent said alterations affect work covered by this Warranty. If Owner engages Roofing Installer to perform said alterations, Warranty shall not become null and void unless Roofing Installer, before starting said work, shall have notified Owner in writing, showing reasonable cause for claim, that said alterations would likely damage or deteriorate work, thereby reasonably justifying a limitation or termination of this Warranty.

5. During Warranty Period, if original use of roof is changed and it becomes used for, but was not originally specified for, a promenade, work deck, spray-cooled surface, flooded basin, or other use or service more severe than originally specified, this Warranty shall become null and void on date of said change, but only to the extent said change affects work covered by this Warranty.

6. Owner shall promptly notify Roofing Installer of observed, known, or suspected leaks, defects, or deterioration and shall afford reasonable opportunity for Roofing Installer to inspect work and to examine evidence of such leaks, defects, or deterioration.

7. This Warranty is recognized to be the only warranty of Roofing Installer on said work and shall not operate to restrict or cut off Owner from other remedies and resources lawfully available to Owner in cases of roofing failure. Specifically, this Warranty shall not operate

07 54 19 - 13 to relieve Roofing Installer of responsibility for performance of original work according to requirements of the Contract Documents, regardless of whether Contract was a contract directly with Owner or a subcontract with Owner's General Contractor.

E. IN WITNESS THEREOF, this instrument has been duly executed this ___________ day of

1. Authorized Signature: _______________________________________.

2. Name: ______________________________________.

3. Title: _______________________________________.

END OF SECTION 07 54 19

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SIKA CORPORATION • ROOFING

100 Dan Road • Canton, MA 02021 Tel: 781-828-5400 • Fax: 781-828-5365 • usa.sarnafil.sika.com Page 1 of 1

20 Year System Warranty Warranty Serial No.: WAR22-1603128-REV1

SIKA CORPORATION ROOFING WARRANTY FOR COMMERCIAL BUILDING

Building Owner: Howard County Public School System Building Name: Murray Hill Middle School Building Address: 9989 Winter Sun Road, Laurel, MD, 20723 Applicator: CitiRoof Corp., 9510 Berger Road, Columbia, MD, 21046 Phone: (410) 381-3100

Date of Substantial Completion: 10/28/2022 Date of Inspection: 11/23/2022

Building/Area Name Used As Area Warranted (Sq. Ft.)

Murray Hill Middle School Education & Culture - Schools 64,400

Sika Corporation warrants to the owner of the building described above ("Owner"), that subject to the terms, conditions, and limitations, including the limitations set forth in section 10 below, stated herein, Sika Corporation will repair roof leaks originating from the Sarnafil Roofing Membrane, Sarnatherm Insulation or Sika Corporation Roofing Accessories* installed according to Sika Corporation's Technical instructions by a Sika Corporation Authorized Roofing Applicator for a period of 20 years commencing with the date of substantial completion of the installation of the Roofing Membrane with no monetary limit with respect to roof repair costs.

* For skylights purchased through Sika Corporation, refer to the attached Skylight Warranty Addendum for specific warranty coverage.

TERMS, CONDITIONS, LIMITATIONS

1. Owner shall notify Sika Corporation on the first business day immediately following the discovery of each leak in the Roofing System and confirm in writing within one week.

2. If on Sika Corporation's inspection, Sika Corporation determines that the leak is caused by a defect in Sarnafil Roofing Membrane, Sarnatherm

Insulation or Accessory provided by Sika Corporation to the Applicator for this building or from a defect in the Sika Corporation Authorized Applicator's workmanship applied to that Sarnafil Membrane, except as provided in the following paragraph three (3) Owner's remedies and Sika Corporation's liability shall be limited to Sika Corporation's repair of the…