Addendum 2~1.pdf

Addendum No. 2 - Page 1 of 3

PROJECT:

Window Replacement - Seigel Health Technologies Building 777 Elsbree Street Fall River, MA 02720 Project No. M-01-27

ADDENDUM NO. 2 09/21/2026

Posted: 09/21/2026 at 10:17AM EDT

Awarding Authority/Owner:

Bristol Community College 777 Elsbree Street Fall River, MA 02720

Reference Contract Documents (drawings and specifications) dated 09/01/2026

The attention of Bidders submitting proposals for the above subject project is called to the following addendum to the specifications and drawings. The items set forth herein, whether of omission, addition, substitution, or clarifications are all to be included in and form a part of the proposal submitted.

THE NUMBER OF THIS ADDENDUM (2) MUST BE ENTERED IN THE APPROPRIATE

SPACE “B” PROVIDED AFTER THE WORD “NUMBERS” OF THE CONTRACT FORM ENTITLED

“FORM FOR GENERAL BID,” AND IN SPACE “B” OF THE “FORM FOR SUB-BID.”

BID DOCUMENT MODIFICATIONS ARE AS FOLLOWS.

Specifications:

■ Replace the following technical sections in their entirety. (See attached) 04 20 00 Unit Masonry

Drawings:

■ Replace the following drawings in their entirety. (See attached) A2.1 Renovation Elevations - Sheet 1 A2.2 Renovation Elevations - Sheet 2

Clarifications:

GENERAL

RFI #6 - Type: General Drawing ref: D1.1 Demolition Key #9, D2.2 elevation 5, D3.1 all sections, A3.1 all sections Section ref: D1.1 Demolition Key #9, D2.2 elevation 5, D3.1 all sections, A3.1 all sections Other ref: Unit Price Section Question:

Throughout the drawings (e.g. D1.1 Demolition Key #9, D2.2 elevation 5, D3.1 all sections, A3.1 all sections), there are notes to remove and replace cracked or damaged brick. Can we assume that the quantity in the unit price section of 50 each is all the brick to be removed and replaced on the project? If not, can a quantity be provided? It is not possible to determine what brick will be damaged due to demolition.

Response: (Prime Designer) Quantity listed under Unit Prices is the quantity to be owned under the bid for existing damaged brick masonry units. Brick/CMU that is “damaged due to demolition” as a result of the contractor’s demolition methods is excluded from the unit price quantity and shall be replaced by the contractor with new masonry units at no additional cost to the Owner.

Addendum No. 2 - Page 2 of 3

RFI #7 - Type: General Drawing ref: D1.1 Demolition Key #9, D2.2 elevation 5, D3.1 all sections, A3.1 all sections Section ref: D1.1 Demolition Key #9, D2.2 elevation 5, D3.1 all sections, A3.1 all sections Other ref: D1.1 Demolition Key #9, D2.2 elevation 5, D3.1 all sections, A3.1 all sections Question:

Does the unit price quantity for removal and replacement of CMU represent the total quantity of CMU to be removed and replaced on the project? If no, can a total quantity be provided for bidding purposes.

Response: (Prime Designer) CMU quantity listed under Unit Prices is the quantity to be owned under the bid for existing damaged CMU.

RFI #8 - Type: General Drawing ref: D4.1 Section ref: Section 04 20 00 MASONRY Question:

Several details on D4.1 have a note requiring the existing masonry substrates/wall construction be prepped and repaired to receive the window system. Is this the responsibility of section 04 20 00 MASONRY? What type of repair is required? Can the end of the walls be parged or do individual pieces of CMU have to be cut out, toothed into the existing and installed to match the previous existing construction?

Response: (Prime Designer) Where existing windows abut damaged brick (exterior) or damaged CMU (interior) damaged units are to be removed and replaced under Section 04 20 00 Masonry using the quantities listed under Section 01 22 00 Unit Prices. CMU needs to be cut out and toothed into the existing as required. New Brick and CMU are to be installed to match the previous existing construction.

RFI #9 - Type: General Drawing ref: D4.1 Section ref: 04 20 00 MASONRY?

Question:

Should we assume the prep and repair work takes place at all windows intersecting interior CMU walls?

Response: (Prime Designer) Repair work includes replacement of existing damaged masonry units. Replacement of CMU is found at the inside face of exterior walls and at interior partition walls.

RFI #10 - Type: General Section ref: 04 20 00 MASONRY Question:

What section is responsible for grouting the hollow metal door frames?

Response: (Bidding Administrator) The grouting of hollow metal door frames shall be by the Masonry Filed Sub-Bid Contractor and shall be included under Section 04 01 20 Maintenance of Unit Masonry.

RFI #11 - Type: General Section ref: Unit Price Section Other ref: Unit Price Section Question:

Is the 200 LF of repointing in the unit price section the total quantity of repointing on the project?

Response: (Prime Designer) Quantity listed under unit prices is the quantity to be owned under the bid.

ARCHITECTURAL

RFI #4 - Type: Architectural Drawing ref: A1.1 through A6.1 Section ref: 071000.FSB Waterproofing/Damproofing/Caulking Other ref: 078446 Fire Resistive Joint Systems Question:

Addendum No. 2 - Page 3 of 3

The architectural drawings do not list where the fire resistive joint systems are located. Please issue a drawing indicating where these joints are located.

Response: (Prime Designer) Fire resistive joint systems are to be used with fire rated openings. Fire rated openings are identified on the Door and Frame Schedule on A6.1

RFI #5 - Type: Architectural Drawing ref: 5 & 6/A5.1 Section ref: Vapor Barrier & Self-Adhered Membrane Flashing Question:

Who is responsible for supplying and installing the self-adhered vapor barrier and the self-adhered membrane flashing. Is there a specification section listing these materials?

Response: (Prime Designer) Vapor Barrier is listed under Spec Section 07 52 16 SBS Modified Bituminous Membrane Roofing.

Membrane flashing is listed under Spec Section 076200 Sheet Metal Flashing and Trim. Both are owned by the General Bidder.

Other Modifications / Attachments:

The following attachment includes additional modifications, clarifications and/or provisions not included in the items above in this Addendum.

See document at the end of document.

All other of the portions of the Contract Documents remain unchanged. Please be reminded to acknowledge this Addendum on the bid forms.

ATTACHMENTS

04 20 00 Unit Masonry A2.1 Renovation Elevations - Sheet 1 A2.2 Renovation Elevations - Sheet 2

26.09.21.BCC.BldgCWin.Add2..pdf --- End of Addendum No. 2 ---

21 September 2026

The Contract Documents are hereby modified as follows:

BIDDING AND CONTRACT REQUIREMENTS

ITEM

NO.

SECTION or

DRAWING

NO.

PARAGRAPH or

DETAIL

DESCRIPTION

1 A5.1 6 DELETE the following note: NEW 8” CMU BLOCK

SUBSTITUTE the following note: NEW 8” CMU BLOCK, CONTRACTOR

FURNISHED AND INSTALLED. PAINT CMU WHERE EXPOSED TO VIEW.

BRISTOL COMMUNITY COLLEGE

BUILDING C WINDOW REPLACEMENT - FALL RIVER CAMPUS

BCC PROJECT NO. M-01-27

SECTION 04 20 00 - UNIT MASONRY

PART 1- GENERAL

1.01 GENERAL PROVISIONS – FILED SUB-BID REQUIRED AS PART OF 04 20

00.FSB MASONRY

A. Work of this Section requires Filed Sub-Bids and is governed by the provisions of the Massachusetts General Laws (MGL), Public Bidding Law Chapter 149, Sections 44A to 44J inclusive; and applicable Section of the MGL, Public Contract Law Chapter 30 as amended.

1.02 RELATED DOCUMENTS

A. The Contractor, Subcontractors, and/or suppliers providing goods or services referenced in or related to this Section shall also be bound by the Documents identified in Division 01 Section “Summary”, Paragraph 1.01A, entitled “Related Documents.”

1.03 SUMMARY

A. This Section includes unit masonry assemblies consisting of the following:

1. Concrete masonry units (CMUs).

2. Mortar and grout.

3. Masonry joint reinforcement.

4. Miscellaneous masonry accessories.

5. Patching and repair of existing CMU masonry.

6. New CMU knee walls

7. All hoisting and scaffolding for completion of masonry work.

8. Masonry waste disposal.

B. Related Sections include the following:

1. Division 01 Section “Cutting and Patching” for cutting and patching of existing masonry.

2. Division 02 Section “Selective Demolition.”

3. Division 07 Section “Sheet Metal Flashing and Trim” for through wall flashing.

4. Division 07 Section "Joint Sealants" for sealing control and expansion joints in unit masonry.

5. Division 07 Section "Fire-Resistive Joint Systems" for fire-resistive joint systems at fire rated openings in masonry walls.

1.04 UNIT PRICES

A. Work of this Section is affected by unit prices specified in Division 01 Section “Unit Prices.”

UNIT MASONRY 04 20 00 - 1 of 16

1. Unit prices apply to additions to and deletions from Work as authorized by Change Orders.

1.05 DEFINITIONS

A. CMU(s): Concrete masonry unit(s).

B. Reinforced Masonry: Masonry containing reinforcing steel in grouted cells.

1.06 PERFORMANCE REQUIREMENTS

A. Provide unit masonry that develops indicated net-area compressive strengths (f'm) at 28 days.

B. Determine net-area compressive strength (f'm) of masonry from average net-area compressive strengths of masonry units and mortar types (unit-strength method) according to Tables 1 and 2 in ACI 530.1/ASCE 6/TMS 602.

1.07 ACTION SUBMITTALS

A. Product Data: For each type of product indicated.

B. Samples for Verification: For each type and color of the following:

1. Accessories embedded in masonry.

2. Reinforcing Steel: Detail bending and placement of unit masonry reinforcing bars. Comply with ACI 315, "Details and Detailing of Concrete Reinforcement." Show elevations of reinforced walls.

1.08 INFORMATIONAL SUBMITTALS

A. List of Materials Used in Constructing Mockups: List generic product names together with manufacturers, manufacturers' product names, model numbers, lot numbers, batch numbers, source of supply, and other information as required to identify materials used. Include mix proportions for mortar and grout and source of aggregates.

1. Submittal is for information only. Neither receipt of list nor approval of mockup constitutes approval of deviations from the Contract Documents unless such deviations are specifically brought to the attention of Architect and approved in writing.

B. Qualification Data: For testing agency.

C. Material Certificates: Include statements of material properties indicating compliance with requirements including compliance with standards and type designations within standards. Provide for each type and size of the following:

1. Masonry units.

UNIT MASONRY 04 20 00 - 2 of 16

a. Include material test reports substantiating compliance with requirements.

b. For masonry units used in structural masonry, include data and calculations establishing average net-area compressive strength of units.

2. Cementitious materials. Include brand, type, and name of manufacturer.

3. Preblended, dry mortar mixes. Include description of type and proportions of ingredients.

4. Grout mixes. Include description of type and proportions of ingredients.

5. Joint reinforcement.

D. Mix Designs: For each type of mortar and grout. Include description of type and proportions of ingredients.

1. Include test reports, per ASTM C 780, for mortar mixes required to comply with property specification.

2. Include test reports, per ASTM C 1019, for grout mixes required to comply with compressive strength requirement.

E. Statement of Compressive Strength of Masonry: For each combination of masonry unit type and mortar type, provide statement of average net-area compressive strength of masonry units, mortar type, and resulting net-area compressive strength of masonry determined according to Tables 1 and 2 in ACI 530.1/ASCE 6/TMS 602.

F. Hot-Weather Procedures: Detailed description of methods, materials, and equipment to be used to comply with hot-weather requirements in ACI 530.1.

G. Cold-Weather Procedures: Detailed description of methods, materials, and equipment to be used to comply with cold-weather requirements in ACI 530.1.

1.09 QUALITY ASSURANCE

A. Testing Agency Qualifications: An independent agency qualified according to ASTM C 1093 for testing indicated, as documented according to ASTM E 548.

B. Source Limitations for Masonry Units: Obtain exposed masonry units of a uniform texture and color, or a uniform blend within the ranges accepted for these characteristics, through one source from a single manufacturer for each product required.

C. Source Limitations for Mortar Materials: Obtain mortar ingredients of a uniform quality, including color for exposed masonry, from a single manufacturer for each cementitious component and from one source or producer for each aggregate.

D. Preconstruction Testing Service: Owner will engage a qualified independent testing agency to perform preconstruction testing indicated below. Payment for these services will be made by Owner. Retesting of materials that fail to meet specified requirements shall be done at Contractor's expense.

1. Mortar Test (Property Specification): For each mix required, per ASTM C 780.

2. Grout Test (Compressive Strength): For each mix required, per ASTM C 1019.

UNIT MASONRY 04 20 00 - 3 of 16

E. Preinstallation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section "Project Management and Coordination."

1.10 DELIVERY, STORAGE, AND HANDLING

A. Store masonry units on elevated platforms in a dry location. If units are not stored in an enclosed location, cover tops and sides of stacks with waterproof sheeting, securely tied. If units become wet, do not install until they are dry.

B. Store cementitious materials on elevated platforms, under cover, and in a dry location.

Do not use cementitious materials that have become damp.

C. Store aggregates where grading and other required characteristics can be maintained and contamination avoided.

D. Deliver preblended, dry mortar mix in moisture-resistant containers designed for lifting and emptying into dispensing silo. Store preblended, dry mortar mix in delivery containers on elevated platforms, under cover, and in a dry location or in a metal dispensing silo with weatherproof cover.

E. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.

1.11 PROJECT CONDITIONS

A. Protection of Masonry: During construction, cover tops of walls, projections, and sills with waterproof sheeting at end of each day's work. Cover partially completed masonry when construction is not in progress.

1. Extend cover a minimum of 24 inches down both sides and hold cover securely in place.

2. Where 1 wythe of multiwythe masonry walls is completed in advance of other wythes, secure cover a minimum of 24 inches down face next to unconstructed wythe and hold cover in place.

B. Do not apply uniform floor or roof loads for at least 12 hours and concentrated loads for at least 3 days after building masonry walls or columns.

C. Stain Prevention: Prevent grout, mortar, and soil from staining the face of masonry to be left exposed or painted. Immediately remove grout, mortar, and soil that come in contact with such masonry.

1. Protect base of walls from rain-splashed mud and from mortar splatter by spreading coverings on ground and over wall surface.

2. Protect sills, ledges, and projections from mortar droppings.

3. Protect surfaces of window and door frames, as well as similar products with painted and integral finishes, from mortar droppings.

4. Turn scaffold boards near the wall on edge at the end of each day to prevent rain from splashing mortar and dirt onto completed masonry.

UNIT MASONRY 04 20 00 - 4 of 16

D. Cold-Weather Requirements: Do not use frozen materials or materials mixed or coated with ice or frost. Do not build on frozen substrates. Remove and replace unit masonry damaged by frost or by freezing conditions. Comply with cold-weather construction requirements contained in ACI 530.1/ASCE 6/TMS 602/1.8C whenever the following conditions exist:

1. The ambient temperature falls below 40 deg F.

2. The temperature of masonry units is below 40 deg F.

3. Implement the following minimum procedures:

a. The temperature of masonry units shall not be less than 20 deg F when laid in the masonry. Remove visible ice on masonry units prior to installation.

b. Heat the mortar sand or mixing water to produce mortar temperatures between 40 deg F and 120 deg F at the time of mixing. Maintain mortar above 32 deg F until used in masonry.

c. Use heat sources where ambient temperatures are between 20 deg F and 25 deg F on both sides of the masonry under construction.

Install wind breaks when wind velocity is in excess of 15 mph.

d. Where ambient temperature is below 20 deg F, provide an enclosure for the masonry under construction and use heat sources to maintain temperature above 32 deg F within the enclosure.

e. Where mean daily temperatures are between 32 deg F and 40 deg F, protect completed masonry from rain and snow by covering with a weather resistive membrane for 24 hours after construction.

f. Where mean daily temperatures are between 25 deg F and 32 deg F, completely cover completed masonry with a weather resistive membrane for 24 hours after construction.

g. Where mean daily temperatures are between 20 deg F and 25 deg F, completely cover completed masonry with insulating blankets, or equal protection, for 24 hours after construction.

h. Where mean daily temperatures are below 20 deg F, maintain masonry temperature above 32 deg F for 24 hours after construction by enclosure with supplementary heat, by electric blankets, by infrared heat lamps, or other acceptable methods.

4. Do not lay masonry units that are wet or frozen.

5. Remove masonry damaged by freezing conditions.

6. Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40 deg F and above and will remain so until masonry has dried, but not less than 7 days after completing cleaning.

E. Hot-Weather Requirements: Comply with hot-weather construction requirements contained in ACI 530.1/ASCE 6/TMS 602/1.8D, whenever the ambient air temperature exceeds the following:

1. 100 deg F, or 90 deg F with a wind velocity greater than 8 mph.

2. Implement hot weather protection in accordance with Article 2.1.2.1(d).

3. Do not spread mortar beds more than 4 feet ahead of masonry. Set masonry units within one minute of spreading mortar.

UNIT MASONRY 04 20 00 - 5 of 16

BCC PROJECT NO. M-01-27

PART 2 - PRODUCTS

2.01 MASONRY UNITS, GENERAL

A. Defective Units: Referenced masonry unit standards may allow a certain percentage of units to exceed tolerances and to contain chips, cracks, or other defects exceeding limits stated in the standard. Do not uses units where such defects, including dimensions that vary from specified dimensions by more than stated tolerances, will be exposed in the completed Work or will impair the quality of completed masonry.

2.02 CONCRETE MASONRY UNITS (CMUs)

A. Shapes: Provide shapes indicated and as follows:

1. Provide special shapes for lintels, corners, jambs, sashes, movement joints, headers, bonding, and other special conditions where indicated.

B. Concrete Masonry Units at Spot Replacement of Damaged CMU: Owner-furnished CMU for contractor installation.

C. Concrete Masonry Units at new Knee Wall: ASTM C 90.

1. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 2,000 psi.

2. Weight Classification: Lightweight

3. Size (Width): Manufactured to dimensions 3/8 inch less that nominal dimensions.

4. Exposed Faces: Manufacturer’s standard color and texture.

5. Products: Subject to compliance with requirements, provide products by one of the following:

a. A. Jandris & Sons

b. Nitterhouse Masonry Products, LLC

c. Westbrook Block, Inc.

2.03 MORTAR AND GROUT MATERIALS

A. Portland Cement: ASTM C 150, Type I or II, except Type III may be used for cold-weather construction. Provide natural color or white cement as required to produce mortar color indicated.

B. Hydrated Lime: ASTM C 207, Type S.

UNIT MASONRY 04 20 00 - 6 of 16

C. Portland Cement-Lime Mix: Packaged blend of portland cement complying with ASTM C 150, Type I or Type III, and hydrated lime complying with ASTM C 207, Type S.

D. Masonry Cement: The use of masonry cement is not permitted.

E. Aggregate for Grout: ASTM C 404.

F. Water: Potable.

G. Mortar Pigments: Natural and synthetic iron oxides and chromium oxides, compounded for use in mortar mixes. Use only pigments with a record of satisfactory performance in masonry mortar.

H. Colored Cement Product: Packaged blend made from portland cement and lime and mortar pigments, all complying with specified requirements, and containing no other ingredients.

1. Formulate blend as required to produce color indicated or, if not indicated, as selected from manufacturer's standard colors.

2. Pigments shall not exceed 10 percent of portland cement by weight.

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

a. Colored Portland Cement-Lime Mix:

1) Flamingo Brixment; Portland & Lime Blend.

2) Lafarge North America Inc.; Eaglebond.

3) Lehigh Cement Company; Lehigh Custom Color

Portland/Lime Cement.

4. Formulate blend as required to produce color indicated or, if not indicated, as selected from manufacturer's standard colors for each masonry type indicated.

I. Cold-Weather Admixture: Nonchloride, noncorrosive, accelerating admixture complying with ASTM C 494/C 494M, Type C, and recommended by manufacturer for use in masonry mortar of composition indicated.

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

a. Euclid Chemical Company (The); Accelguard 80.

b. GCP Applied Technologies; Morset.

c. RussTech; Mortarset-NC.

2.04 MORTAR AND GROUT MIXES

A. General: Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, water-repellent agents, antifreeze compounds, or other admixtures, unless otherwise indicated.

UNIT MASONRY 04 20 00 - 7 of 16

1. Do not use calcium chloride in mortar or grout.

2. Limit cementitious materials in mortar to portland cement and lime.

3. Add cold-weather admixture (if used) at same rate for all mortar that will be exposed to view, regardless of weather conditions, to ensure that mortar color is consistent.

B. Mortar Mixes: At Contractor’s option, provide job-mixed mortar or preblended dry mortar mix.

C. Preblended, Dry Mortar Mix: Furnish dry mortar ingredients in form of a preblended mix. Measure quantities by weight to ensure accurate proportions, and thoroughly blend ingredients before delivering to Project site.

1. Basis of Design Product: Subject to compliance with requirements, provide the following, or equal:

a. Spec Mix; Portland Lime & Sand.

D. Mortar Types for Unit Masonry: Comply with ASTM C 270, Proportion Specification.

Provide the following types of mortar for applications stated:

1. For masonry below grade or in contact with earth, use Type S.

2. For reinforced masonry, use Type M or S.

3. For exterior, above-grade, load-bearing and non-load-bearing walls and parapet walls; for interior load-bearing walls; for interior non-load-bearing partitions; and for other applications where another type is not indicated, use Type S.

4. For exterior masonry veneer, use Type N.

E. Grout for Unit Masonry: Comply with ASTM C 476.

1. Use grout of type indicated or, if not otherwise indicated, of type (fine or coarse) that will comply with Table 1.15.1 in ACI 530.1/ASCE 6/TMS 602 for dimensions of grout spaces and pour height.

a. Use fine grout for 6 inch thick concrete masonry wythes.

b. Use course grout for 8-inch thick or greater concrete masonry wythes.

2. Proportion grout in accordance with ASTM C 476, Table 1 or paragraph 4.2.2 for specified 28-day compressive strength indicated, but not less than 2000 psi.

3. Provide grout with a slump of 8 to 11 inches as measured according to ASTM C 143.

2.05 MASONRY JOINT REINFORCEMENT

A. Masonry Joint Reinforcement, General: ASTM A 951.

1. Interior Walls: Hot-dip galvanized, carbon steel.

2. Wire Size for Side Rods: W1.7 or 0.148-inch diameter (9 gauge).

3. Wire Size for Cross Rods: W1.7 or 0.148-inch diameter (9 gauge).

UNIT MASONRY 04 20 00 - 8 of 16

4. Wire Size for Veneer Ties: W2.8 or 0.188-inch diameter (3/16-inch).

5. Spacing of Cross Rods, Tabs, and Cross Ties: Not more than 16 inches o.c.

6. Provide in lengths of not less than 10 feet, with prefabricated corner and tee units.

B. Masonry Joint Reinforcement for Single-Wythe Masonry: Ladder type with single pair of side rods.

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

a. Heckmann Building Products; Ladder Type 1100.

b. Hohmann & Barnard, Inc.; #220 Ladder Mesh.

c. Wire-Bond; Series 200 Core Clear Ladder Type.

2.06 MISCELLANEOUS ANCHORS

A. Unit Type Inserts in Concrete: Cast-iron or malleable-iron wedge-type inserts.

B. Anchor Bolts: Headed steel bolts complying with ASTM A 307, Grade A; with ASTM A 563 hex nuts and, where indicated, flat washers; hot-dip galvanized to comply with ASTM A 153/A 153M, Class C; of dimensions indicated.

C. Postinstalled Anchors: Provide torque-controlled expansion anchors, with capability to sustain, without failure, a load equal to six times the load imposed when installed in solid or grouted unit masonry and equal to four times the load imposed when installed in concrete, as determined by testing per ASTM E 488 conducted by a qualified independent testing agency.

1. Corrosion Protection: Carbon-steel components zinc plated to comply with ASTM B 633, Class Fe/Zn 5 (5 microns) for Class SC 1 service condition (mild).

2.07 MASONRY CLEANERS

A. Proprietary Acidic Cleaner: Manufacturer's standard-strength cleaner designed for removing mortar/grout stains, efflorescence, and other new construction stains from new masonry without discoloring or damaging masonry surfaces. Use product expressly approved for intended use by cleaner manufacturer and manufacturer of masonry units being cleaned.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

a. Diedrich Technologies, Inc.

b. EaCoChem.

c. PROSOCO.

B. Detergent Solution, Job Mixed: Solution prepared by mixing 2 cups of tetrasodium pyrophosphate (TSPP), 1/2 cup of laundry detergent, and 20 quarts of hot water for every 5 gal. of solution required.

2.08 REINFORCING STEEL

UNIT MASONRY 04 20 00 - 9 of 16

A. Uncoated Steel Reinforcing Bars: ASTM A 615/A 615M or ASTM A 996/A 996M, Grade 60.

2.09 MISCELLANEOUS MASONRY ACCESSORIES

A. Compressible Filler: Premolded filler strips complying with ASTM D 1056, Grade 2A1; compressible up to 35 percent; of width and thickness indicat-ed; formulated from neoprene.

1. Control Joints: Provide compressible filler, 3/8-inch thick and 3 inches wide.

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

1) Heckmann Building Products; Neoprene Expansion Joints 354.

2) Hohmann & Barnard, Inc.; NS Closed Cell Neoprene Sponge.

3) Wire-Bond; #3300 Expansion Joint.

B. Bond-Breaker Strips: Asphalt-saturated, organic roofing felt complying with ASTM D 226, Type I (No. 15 asphalt felt).

C. Preformed Control-Joint Gaskets: Made from PVC, complying with ASTM D 2287, Type PVC-65406 and designed to fit standard sash block and to maintain lateral stability in masonry wall; size and configuration as indicated.

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

a. Blok-Lok; VS Series PVC Control Joint.

b. Hohmann & Barnard, Inc.; #VS Series – PVC Control Joint.

c. Wire-Bond; PVC Control Joint.

D. Reinforcing Bar Positioners: Wire units designed to fit into mortar bed joints spanning masonry unit cells with loops for holding reinforcing bars in center of cells. Units are formed from 0.148-inch (9 gauge) steel wire, hot-dip galvanized after fabrication. Provide units with either two loops or four loops as needed for number of bars indicated.

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

a. Heckmann Building Products Inc.; No. 376 Rebar Positioner.

b. Hohmann & Barnard, Inc.; #RB or #RB-Twin Rebar Positioner.

c. Wire-Bond; O-Ring or Double O-Ring Rebar Positioner.

UNIT MASONRY 04 20 00 - 10 of 16

BCC PROJECT NO. M-01-27

PART 3 - EXECUTION

3.01 EXAMINATION

A. Examine conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of work.

1. For the record, prepare written report, endorsed by Installer, listing conditions detrimental to performance of work.

2. Verify that reinforcing dowels are properly placed.

B. Before installation, examine rough-in and built-in construction for piping systems to verify actual locations of piping connections.

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

3.02 INSTALLATION, GENERAL

A. Thickness: Build single-wythe walls to actual widths of masonry units, using units of widths indicated.

B. Use full-size units without cutting if possible. If cutting is required to provide a continuous pattern or to fit adjoining construction, cut units with motor-driven saws;

provide clean, sharp, unchipped edges. Allow units to dry before laying unless wetting of units is specified. Install cut units with cut surfaces and, where possible, cut edges concealed.

C. Select and arrange units for exposed unit masonry to produce a uniform blend of colors and textures.

1. Mix units from several pallets or cubes as they are placed.

D. Matching Existing Masonry: Match coursing, bonding, color, and texture of existing masonry.

3.03 TOLERANCES

A. Dimensions and Locations of Elements:

1. For dimensions in cross section or elevation do not vary by more than plus 1/2 inch or minus 1/4 inch.

2. For location of elements in plan do not vary from that indicated by more than plus or minus 1/2 inch.

3. For location of elements in elevation do not vary from that indicated by more than plus or minus 1/4 inch in a story height or 1/2 inch total.

B. Comply with construction tolerances in ACI 530.1/ASCE 6/TMS 602 and with the

UNIT MASONRY 04 20 00 - 11 of 16

1. For conspicuous vertical lines, such as external corners, door jambs, reveals, and expansion and control joints, do not vary from plumb by more than 1/8 inch in 10 feet, 1/4 inch in 20 feet, or 1/2 inch maximum.

2. For vertical alignment of exposed head joints, do not vary from plumb by more than 1/4 inch in 10 feet, or 1/2 inch maximum.

3. For conspicuous horizontal lines, such as lintels, sills, parapets, and reveals, do not vary from level by more than 1/8 inch in 10 feet, 1/4 inch in 20 feet, or 1/2 inch maximum.

4. For exposed bed joints, do not vary from thickness indicated by more than plus or minus 1/8 inch, with a maximum thickness limited to 1/2 inch. Do not vary from bed-joint thickness of adjacent courses by more than 1/8 inch.

5. For exposed head joints, do not vary from thickness indicated by more than plus or minus 1/8 inch. Do not vary from adjacent bed-joint and head-joint thicknesses by more than 1/8 inch.

6. For faces of adjacent exposed masonry units, do not vary from flush alignment by more than 1/16 inch except due to warpage of masonry units within tolerances specified for warpage of units.

7. For exposed bed joints and head joints of stacked bond, do not vary from a straight line by more than 1/16 inch from one masonry unit to the next.

3.04 LAYING MASONRY WALLS

A. Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint thicknesses and for accurate location of openings, movement-type joints, returns, and offsets. Avoid using less-than-half-size units, particularly at corners, jambs, and, where possible, at other locations.

B. Bond Pattern for Exposed Masonry: Unless otherwise indicated, lay exposed masonry in the following bond pattern(s); do not use units with less than nominal 4-inch horizontal face dimensions at corners or jambs.

1. Running bond, or as required to match existing.

C. Lay concealed masonry with all units in a wythe in running bond or bonded by lapping not less than 2-inches. Bond and interlock each course of each wythe at corners. Do not use units with less than nominal 4-inch horizontal face dimensions at corners or jambs.

D. Stopping and Resuming Work: Stop work by racking back units in each course from those in course below; do not tooth. When resuming work, clean masonry surfaces that are to receive mortar, remove loose masonry units and mortar.

E. Built-in Work: As construction progresses, build in items specified in this and other Sections. Fill in solidly with masonry around built-in items.

F. Where built-in items are to be embedded in cores of hollow masonry units, place a layer of metal lath, wire mesh, or plastic mesh in the joint below and rod mortar or grout into core.

G. Fill cores in hollow concrete masonry units with grout 24 inches under bearing plates, beams, lintels, posts, and similar items, unless otherwise indicated.

UNIT MASONRY 04 20 00 - 12 of 16

H. Build non-load-bearing interior partitions full height of story to underside of solid floor or roof structure above, unless otherwise indicated.

1. Install compressible filler in joint between top of partition and underside of structure above.

2. Fasten partition top anchors to structure above and build into top of partition. Grout cells of CMUs solidly around plastic tubes of anchors and push tubes down into grout to provide 1/2-inch clearance between end of anchor rod and end of tube. Space anchors 48 inches o.c., unless otherwise indicated.

3. At fire-rated partitions, treat joint between top of partition and underside of structure above to comply with Division 07 Section "Fire- Resistive Joint Systems."

3.05 MORTAR BEDDING AND JOINTING

A. Lay concrete masonry units as follows:

1. With face shells fully bedded in mortar and with head joints of depth equal to bed joints.

2. With webs fully bedded in mortar in all courses of piers, columns, and pilasters.

3. With webs fully bedded in mortar in grouted masonry, including starting course on footings.

4. With entire units, including areas under cells, fully bedded in mortar at starting course on footings where cells are not grouted.

B. Lay solid masonry units with completely filled bed and head joints; butter ends with sufficient mortar to fill head joints and shove into place. Do not deeply furrow bed joints or slush head joints.

C. Tool exposed joints slightly concave when thumbprint hard, using a jointer larger than joint thickness, unless otherwise indicated.

3.06 MASONRY JOINT REINFORCEMENT

A. General: Install entire length of longitudinal side rods in mortar with a minimum cover of 5/8 inch on exterior side of walls, 1/2 inch elsewhere. Lap reinforcement a minimum of 6 inches.

1. Space reinforcement not more than 16 inches o.c.

2. Space reinforcement not more than 8 inches o.c. in foundation walls and parapet walls.

3. Provide reinforcement not more than 8 inches above and below wall openings and extending 12 inches beyond openings.

a. Reinforcement above is in addition to continuous reinforcement.

B. Interrupt joint reinforcement at control and expansion joints, unless otherwise indicated.

C. Provide continuity at wall intersections by using prefabricated T-shaped units.

D. Provide continuity at corners by using prefabricated L-shaped units.

UNIT MASONRY 04 20 00 - 13 of 16

E. Cut and bend reinforcing units as directed by manufacturer for continuity at corners, returns, offsets, column fireproofing, pipe enclosures, and other special conditions.

3.07 CONTROL AND EXPANSION JOINTS

A. General: Install control and expansion joint materials in unit masonry as masonry progresses. Do not allow materials to span control and expansion joints without provision to allow for in-plane wall or partition movement.

B. Form control joints in concrete masonry as follows:

1. Fit bond-breaker strips into hollow contour in ends of concrete masonry units on one side of control joint. Fill resultant core with grout and rake out joints in exposed faces for application of sealant.

2. Install control joints in interior concrete masonry partitions where indicated, and as follows. During wall layout, verify locations of all control joints with Architect.

a. Spacing of control joints in straight walls not to exceed 20 feet horizontally.

b. Install control joints at intersections of walls and column enclosures.

3.08 REINFORCED UNIT MASONRY INSTALLATION

A. Temporary Formwork and Shores: Construct formwork and shores as needed to support reinforced masonry elements during construction.

1. Construct formwork to provide shape, line, and dimensions of complet-ed masonry as indicated. Make forms sufficiently tight to prevent leak-age of mortar and grout. Brace, tie, and support forms to maintain posi-tion and shape during construction and curing of reinforced masonry.

2. Do not remove forms and shores until reinforced masonry members have hardened sufficiently to carry their own weight and other temporary loads that may be placed on them during construction.

B. Placing Reinforcement: Comply with requirements in ACI 530.1/ASCE 6/TMS

602.

C. Grouting: Do not place grout until entire height of masonry to be grout-ed has attained enough strength to resist grout pressure.

1. Comply with requirements in ACI 530.1/ASCE 6/TMS 602 for cleanouts and for grout placement, including minimum grout space and maximum pour height.

D. Do not remove forms and shores until reinforced masonry members have hardened sufficiently to carry their own weight and other temporary loads that may be placed on them during construction.

3.09 FIELD QUALITY CONTROL

A. Testing and Inspecting: Owner will engage special inspectors to perform tests and inspections and prepare reports. Allow inspectors access to scaffolding and work

UNIT MASONRY 04 20 00 - 14 of 16 areas, as needed to perform tests and inspections. Retesting of materials that fail to comply with specified requirements shall be done at Contractor's expense.

B. Inspections: Special inspections according to the Massachusetts State Building Code.

1. Begin masonry construction only after inspectors have verified proportions of site-prepared mortar.

2. Place grout only after inspectors have verified compliance of grout spaces and of grades, sizes, and locations of reinforcement.

C. Testing Agency: Owner will engage a qualified independent testing and inspecting agency to perform field tests and inspections indicated below and prepare test reports:

1. Payment for these services will be made by Owner.

2. Retesting of materials failing to comply with specified requirements shall be done at Contractor's expense.

D. Testing Frequency: One set of tests for each 5000 sq. ft. of wall area or portion thereof.

E. Mortar Test (Property Specification): For each mix provided, per ASTM C 780. Test mortar for compressive strength.

3.10 REPAIRING, POINTING, AND CLEANING

A. Remove and replace masonry units that are loose, chipped, broken, stained, or otherwise damaged or that do not match adjoining units. Install new units to match adjoining units; install in fresh mortar, pointed to eliminate evidence of replacement.

B. Pointing: During the tooling of joints, enlarge voids and holes, except weep holes, and completely fill with mortar. Point up joints, including corners, openings, and adjacent construction, to provide a neat, uniform appearance. Prepare joints for sealant application, where indicated.

C. In-Progress Cleaning: Clean unit masonry as work progresses by dry brushing to remove mortar fins and smears before tooling joints.

D. Final Cleaning: After mortar is thoroughly set and cured, clean exposed masonry as follows:

1. Remove large mortar particles by hand with wooden paddles and nonmetallic scrape hoes or chisels.

2. Test cleaning methods on sample wall panel; leave one-half of panel uncleaned for comparison purposes. Obtain Architect's approval of sample cleaning before proceeding with cleaning of masonry.

3. Protect adjacent stone and nonmasonry surfaces from contact with cleaner by covering them with liquid strippable masking agent or polyethylene film and waterproof masking tape.

4. Wet wall surfaces with water before applying cleaners; remove cleaners promptly by rinsing surfaces thoroughly with clear water.

5. Clean masonry with a proprietary acidic cleaner applied according to manufacturer's written instructions.

6. Clean concrete masonry by cleaning method indicated in NCMA TEK 8-2A applicable to type of stain on exposed surfaces.

UNIT MASONRY 04 20 00 - 15 of 16

BCC PROJECT NO. M-01-27

3.11 MASONRY WASTE DISPOSAL

A. Salvageable Materials: Unless otherwise indicated, excess masonry materials are Contractor's property. At completion of unit masonry work, remove from Project site.

1. Disposal: Separate, salvage, recycle and dispose of materials in accordance with the Commonwealth of Massachusetts “Waste Ban” 310 CMR 19.017.

END OF SECTION

UNIT MASONRY 04 20 00 - 16 of 16

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

T.O. SLAB AT SPANDREL

ELEV. = 198'-0"

T.O. BRICK

ELEV. = 203'-0"

T.O. BRICK

ELEV. = 207'-4"

8 " =1'-0"

1 RENOVATION ELEVATION: NORTH

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

8 " =1'-0"

2 RENOVATION PARTIAL ELEVATION: EAST

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

T.O. SLAB AT SPANDREL

ELEV. = 198'-0"

EX

D

EX

G

EX

I

8 " =1'-0"

3 RENOVATION PARTIAL ELEVATION: WEST

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

T.O. SLAB AT SPANDREL

ELEV. = 198'-0"

T.O. BRICK

ELEV. = 203'-0"

T.O. BRICK

ELEV. = 207'-4"

EX

I

EX

G

EX

F

EX

E

EX

C 1

8 " =1'-0"

4 RENOVATION ELEVATION: WEST

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

T.O. SLAB AT SPANDREL

ELEV. = 198'-0"

T.O. BRICK

ELEV. = 203'-0"

T.O. BRICK

ELEV. = 207'-4"

EX

P

EX

Q

EX

N

EX

M

EX

K

EX

I

EX

G

EX

F

EX

D

EX

B

EX

A

EXISTING MECHANICAL

LOUVER - NOT IN CONTRACT

REINSTALL SALVAGED ALUMINUM

DOORS, HARDWARE AND DOOR

CONTACTS IN NEW ALUMINUM

STOREFRONT SYSTEM.

REINSTALL SALVAGED

ALUMINUM DOORS, HARDWARE

AND DOOR CONTACTS IN NEW

ALUMINUM STOREFRONT

EXISTING PUSH PAD FOR

EXISTING POWER

OPERATOR TO REMAIN.

EXISTING ALUMINUM DOORS AND

STOREFRONT SYSTEMS AT THE

BOOKSTORE TO REMAIN. - NOT IN

CONTRACT.

NEW ALUMINUM STOREFRONT SYSTEM.

NEW ALUMINUM STOREFRONT

SYSTEM.

NEW ALUMINUM STOREFRONT

SYSTEM.

TYPICAL CASEMENT WINDOW UNIT.

REFER TO DETAILS FOR ADD'L

INFORMATION.

EXISTING LOUVER TO REMAIN

TYPICAL CASEMENT WINDOW

UNIT. REFER TO DETAILS FOR

ADD'L INFORMATION.

A3.1

TYPICAL FIXED WINDOW UNIT.

REFER TO DETAILS FOR ADD'L

INFORMATION.

TYPICAL FIXED GLAZING WINDOW UNIT.

REFER TO DETAILS FOR ADD'L INFORMATION.

NEW ALUMINUM STOREFRONT

SYSTEM.

TYPICAL CASEMENT WINDOW

UNIT. REFER TO DETAILS FOR

ADD'L INFORMATION.

TYPICAL FIXED WINDOW

UNIT. REFER TO DETAILS FOR

ADD'L INFORMATION.

HJ E

A

A

PQ

R

A1

A

D

X

C

B

C4

C2C3

EXISTING ALUMINUM

WINDOWS, DOORS AND

STOREFRONT SYSTEMS AT

THE BOOKSTORE TO

REMAIN. NOT IN CONTRACT.

EXTENT OF EXISTING

FENCE TO BE

REINSTALLED

NEW HOLLOW METAL DOOR,

FRAME, AND HARDWARE

NEW HOLLOW METAL

DOOR, FRAME, AND

HARDWARE

EX

F

EX

C

R2

OPP.

HAND

OPP.

HAND

NEW BRICK REPLACEMENT

NEW BRICK REPLACEMENT

NEW BRICK REPLACEMENT

NEW BRICK REPLACEMENT

NEW BRICK REPLACEMENT

NEW CMU KNEE WALL.

NOT TO SCALE

KEY PLANS

FIRST FLOOR SECOND FLOOR

A2.1

A2.2

A2.2

A2.2

A2.2

A2.1

A2.1

A2.1

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VITREOUS CHINAC_TOILETSSTRATTONK-4450-C

VITREOUS CHINAC_TOILETSSTRATTONK-4450-C

A2.2

A2.2

A2.2

A2.1

A2.1

A2.1

A2.1

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EV

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SH

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BC

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PR

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A2.1

RE

NO

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S

EP

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MB

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8 " =1'-0"

5 RENOVATION ELEVATION: EAST

EX

A

EX

B

EX

G

EX

H

EX

J

EX

L

EX

M

EX

N

EX

O

EX

Q

8 " =1'-0"

1 RENOVATION ELEVATION: SOUTH

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

EX

8 " =1'-0"

4 RENOVATION PARTIAL ELEVATION: NORTH

8 " =1'-0"

3 RENOVATION PARTIAL ELEVATION: WEST

8 " =1'-0"

2 RENOVATION PARTIAL ELEVATION: EAST

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

T.O. SLAB AT SPANDREL

ELEV. = 198'-0"

T.O. BRICK

ELEV. = 203'-0"

T.O. BRICK

ELEV. = 207'-4"

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

T.O. SLAB AT SPANDREL

ELEV. = 198'-0"

T.O. BRICK

ELEV. = 203'-0"

T.O. BRICK

ELEV. = 207'-4"

EXISTING MECHANICAL

LOUVER - NOT IN CONTRACT

EXISTING MECHANICAL

LOUVER - NOT IN CONTRACT

REINSTALL SALVAGED ALUMINUM

DOORS, HARDWARE AND DOOR

CONTACTS IN NEW ALUMINUM

STOREFRONT SYSTEM.

REINSTALL SALVAGED ALUMINUM DOORS,

HARDWARE AND DOOR CONTACTS IN NEW

ALUMINUM STOREFRONT SYSTEM.

EXISTING DOOR ACTUATOR AND BOLLARD TO REMAIN.

EXISTING LOUVER

TO REMAIN

TYPICAL FIXED WINDOW

UNIT. REFER TO DETAILS

FOR ADD'L INFORMATION.

EXISTING WINDOWS AT THE

BOOKSTORE TO REMAIN. - NOT IN

CONTRACT.

NEW ALUMINUM STOREFRONT

SYSTEM.

NEW ALUMINUM STOREFRONT

SYSTEM.

NEW ALUMINUM

STOREFRONT SYSTEM.

NEW ALUMINUM WINDOW SYSTEM.

NEW ALUMINUM STOREFRONT

SYSTEM.

TYPICAL FIXED WINDOW

UNIT. REFER TO DETAILS

FOR ADD'L INFORMATION.

TYPICAL CASEMENT

WINDOW UNIT. REFER TO

DETAILS FOR ADD'L

INFORMATION.

NEW ALUMINUM

STOREFRONT

SYSTEM.

TYPICAL CASEMENT

WINDOW UNIT. REFER

TO DETAILS FOR ADD'L

INFORMATION.

TYPICAL FIXED WINDOW UNIT.

REFER TO DETAILS FOR ADD'L

INFORMATION.

TYPICAL CASEMENT WINDOW

UNIT. REFER TO DETAILS FOR

ADD'L INFORMATION.

EXISTING LOUVER

TO REMAIN

EX

P

EX

N

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

NEW ALUMINUM STOREFRONT

SYSTEM.

EX

O

EX

Q

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

NEW ALUMINUM DOOR,

FRAME AND HARDWARE

TYPICAL FIXED WINDOW UNIT.

REFER TO DETAILS FOR ADD'L

INFORMATION.

TYPICAL OPERABLE CASEMENT

WINDOW UNIT. REFER TO DETAILS

FOR ADD'L INFORMATION.

EX

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

NEW ALUMINUM STOREFRONT

SYSTEM.

A3.1

A3.1

A1 A1 A

A1

A A

A2

F K

UVW

S

N

M

L

C1 C9 C6

C7

15'-0"

REINSTALL EXISTING

SALVAGED FENCE

EXISTING FENCE

TO REMAIN

NEW ALUMINUM STOREFRONT SYSTEM.

A3.1

SIM.

NEW HOLLOW METAL

DOOR AND FRAME

OPP.

HAND

OPP.

HAND

OPP.

HAND

EXTENT OF EXISTING FENCE TO BE REINSTALLED

R1

8 " =1'-0"

6 RENOVATION ELEVATION: EAST

C8

EX

O

EX

N

EX

M

NEW ALUMINUM DOOR,

FRAME AND HARDWARE

T

G

NEW BRICK REPLACEMENT

NEW BRICK REPLACEMENT

NEW BRICK REPLACEMENT

NEW CMU KNEE WALL

FIN. GRADE

ELEV. = 173'-6"

FIRST FLOOR

ELEV. = 174'-0"

SECOND FLOOR

ELEV. = 186'-0"

P

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VITREOUS CHINAC_TOILETSSTRATTONK-4450-C

NOT TO SCALE

KEY PLANS

FIRST FLOOR SECOND FLOOR

A2.2

A2.1

A2.2

A2.2

A2.2

A2.2

A2.1

A2.1

A2.2

A2.2

A2.1

A2.1

A2.1

A2.1

A2.1

EL

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IO

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SH

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T

1 8 "

1' -0

SC

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PR

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NO

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DA

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: 2 6 A

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BU

ILD

IN

G

C W

IN

DO

W R

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LA

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ME

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BR

IS

TO

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MU

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C

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BC

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M-

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A2.2

RE

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S

EP

TE

MB

ER