Unit Masonry - Exterior ME- Building Group

SECTION 042000 - UNIT MASONRY – EXTERIOR

PART 1 - GENERAL

1.1  RELATED DOCUMENTS

  1. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2  SUMMARY

  1. This Section includes:
  2. Exterior concrete unit masonry.
  3. Face brick.
  4. Mortar and grout.
  5. Steel Reinforcing Bars
  6. Products furnished but not installed under this Section include the following:
  7. Division5 Section "Metal Fabrications" for anchor sections of adjustable masonry anchors for connecting to structural frame.
  8. Products installed but not furnished under this Section include the following:
  9. Division5 Section "Metal Fabrications" for steel lintels.
  10. Division6 Section "Miscellaneous Carpentry." for wood nailers and blocking.

1.3  SUBMITTALS

  1. Product data for each different masonry unit, accessory, and other manufactured product specified.
  2. LEED Submittals:
  3. Product Data for Credit MR 4: For products having recycled content, documentation indicating percentages by weight of postconsumer and preconsumer recycled content.
  4. Include statement indicating cost for each product having recycled content.

"Product Certificates for CreditMR5" Subparagraph below applies to LEED-NC, LEED-CS, and LEED for Schools.

  1. Product Certificates for CreditMR5: For products and materials required to comply with requirements for regional materials indicating location and distance from Project of material manufacturer and point of extraction, harvest, or recovery for each raw material.
  2. Include statement indicating cost for each regional material and the fraction by weight that is considered regional.
  3. Mix Designs: For each type of mortarand grout. Include description of type and proportions of ingredients.
  4. Include test reports for mortar mixes required to comply with property specification. Test according to ASTMC109/C109M for compressive strength, ASTMC1506 for water retention, and ASTMC91 for air content.
  5. Include test reports, according to ASTMC1019, for grout mixes required to comply with compressive strength requirement.

1.4  QUALITY ASSURANCE

  1. Fire-Resistance Ratings: Where indicated, provide materials and construction identical to those of assemblies with fire resistance ratings determined per ASTME119 by a testing and inspecting agency, by equivalent concrete masonry thickness, or by another means, as acceptable to authorities having jurisdiction.
  2. Single-Source Responsibility for Masonry Units: Obtain exposed masonry units of a uniform texture and color, or a uniform blend within the ranges accepted for these characteristics, from one source and by a single manufacturer for each different product required.
  3. Single-Source Responsibility for Mortar Materials: Obtain mortar ingredients of a uniform quality, including color for exposed masonry, from one manufacturer for each cementitious component and from one source or producer for each aggregate.

1.5  DELIVERY, STORAGE, AND HANDLING

  1. Store masonry units on elevated platforms, under cover, and in a dry location to prevent their deterioration or damage due to moisture, temperature changes, contaminants, corrosion, and other causes. If units become wet, do not install until they are in an air-dried condition.
  2. Store cementitious materials on elevated platforms, under cover, and in a dry location.
  3. Store aggregates where grading and other required characteristics can be maintained and contamination avoided.
  4. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.

1.6  PROJECT CONDITIONS

  1. Protection of Masonry: During erection of masonry exposed to the weather, 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.
  2. Extend cover a minimum of 24 inches down both sides and hold cover securely in place.
  3. 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.
  4. 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.
  5. Protect base of walls from rain-splashed mud and mortar splatter by coverings spread on ground and over wall surface.
  6. Protect sills, ledges, and projections from mortar droppings.
  7. Protect surfaces of window and door frames, as well as similar products with painted and integral finishes, from mortar droppings.
  8. Turn scaffold boards near the wall on edge at the end of each day to prevent rain from splashing mortar and dirt on completed masonry.
  9. Cold-Weather Requirements: Do not use frozen materials or materials mixed or coated with ice or frost. Do not build on frozen subgrade or setting beds. Remove and replace unit masonry damaged by frost or freezing conditions. Comply with the following requirements:
  10. Cold-Weather Construction: When the ambient temperature is within the limits indicated, use the following procedures:
  11. 40 to 32 degF: Heat mixing water or sand to produce mortar temperatures between 40 and 120 degF.
  12. 32 to 25 degF: Heat mixing water and sand to produce mortar temperatures between 40 and 120 degF. Heat grout materials to produce grout temperatures between 40 and 120 degF. Maintain mortar and grout above freezing until used in masonry.
  13. 25 to 20 degF: Heat mixing water and sand to produce mortar temperatures between 40 and 120 degF. Heat grout materials to produce grout temperatures between 40 and 120 degF. Maintain mortar and grout above freezing until used in masonry. Heat masonry units to 40 degF if grouting. Use heat on both sides of walls under construction.
  14. 20 degF and Below: Heat mixing water and sand to produce mortar temperatures between 40 and 120 degF. Heat grout materials to produce grout temperatures between 40 and 120 degF. Maintain mortar and grout above freezing until used in masonry. Heat masonry units to 40 degF. Provide enclosures and use heat on both sides of walls under construction to maintain temperatures above 32 degF within the enclosures.
  15. Cold-Weather Protection: When the mean daily temperature is within the limits indicated, provide the following protection:
  16. 40 to 25 degF: Cover masonry with a weather-resistant membrane for 48 hours after construction.
  17. 25 to 20 degF: Cover masonry with insulating blankets or provide enclosure and heat for 48 hours after construction to prevent freezing. Install wind breaks when wind velocity exceeds 15 mph.
  18. 20 degF and Below: Provide enclosure and heat to maintain temperatures above 32 degF within the enclosure for 48 hours after construction.
  19. Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40 degF and above and will remain so until masonry has dried out, but not less than 7 days after completion of cleaning.
  20. Hot-Weather Requirements: Protect unit masonry work when temperature and humidity conditions produce excessive evaporation of water from mortar and grout. Provide artificial shade and wind breaks and use cooled materials as required. Do not apply mortar to substrates with temperatures of 100 degF and above.

PART 2 - PRODUCTS

2.1  MANUFACTURERS

  1. Manufacturers: Unless otherwise directed by the Owner, provide products by one of the following:
  2. Joint Reinforcement, Ties, and Anchors:
  3. Dur-O-Wal, Inc.
  4. Heckman Building Products, Inc.
  5. Hohmann & Barnard, Inc.
  6. Masonry Reinforcing Corp. of America.
  7. National Wire Products Industries.
  8. Southern Construction Products.

2.2  CONCRETE MASONRY UNITS

Retain "Regional Materials" Paragraph below for LEED-NC, LEED-CS, or LEED for SchoolsCreditMR5; before retaining, verify availability of materials that comply.

  1. Regional Materials: CMUs shall be manufactured within 500 miles of Project site from aggregatesand cement that have been extracted, harvested, or recovered, as well as manufactured, within 500 miles of Project site.
  2. General: Provide shapes indicated and as follows for each form of concrete masonry unit required.
  3. Provide special shapes for lintels, corners, jambs, sash, control joints, headers, bonding, and other special conditions.
  4. Provide bullnose units for outside corners, unless otherwise indicated.
  5. Concrete Masonry Units: ASTMC90 and as follows:
  6. Unit Compressive Strength: Provide units with minimum average net-area compressive strength indicated below:
  7. [2150 psi][2800 psi][3050 psi][Insert value].
  8. Weight Classification: [Lightweight][Medium weight][Normal weight].
  9. Aggregates: Do not use aggregates made from pumice, scoria, or tuff.
  10. Provide TypeI, moisture-controlled units.
  11. Exposed Faces: Manufacturer's standard color and texture, unless otherwise indicated.
  12. Integral Water Repellent: Provide units made with integral water repellent for exterior exposed units.
  13. Integral Water Repellent: Liquid polmeric, integral water-repellent admixture that does not reduce flexural bond strength. Units made with integral water repellent, when tested as a wall assembly made with mortar containing integral water-repellent manufacturer’s mortar additive according to ASTM E 514, with test period extended to 24 hours, show no visible leaks on the back of the test specimen.
  14. Products:

1)  W.R. Grace; Block Plus W-10.

2)  Grace Construction Products, a unit of W.R. Grace & Co. – Conn.; Dry Block.

3)  BASF; MasterPel 240.

  1. Acoustic Units: Units shall meet the requirements of ASTM C90, normal weight class. Units shall have inserts installed by the unit manufacturer at the plant.
  2. Where units have sound-absorbing filler, the fillers shall be fabricated of incombustible fibrous material with a metal septa laminated to one side. Filler shall be installed in the cavities of the units with the septa facing away from the slots.
  3. Where units do not have sound-absorbing filler, only the metal septum shall be installed.
  4. Products:
  5. Proudfoot Co.; Soundblox
  6. Trenwyth Industries, Inc.; Acousta-Wal

2.3  FACE BRICK

  1. Products: Subject to compliance with requirements, [provide the following] [provide one of the following] [available products that may be incorporated into the Work include, but are not limited to, the following]:
  2. Insert, in separate subparagraphs, manufacturer's name; product name or designation for acceptable face brick>.

1)  Color and Texture: [Match Architect's samples] [As selected by Owner].

  1. Grade: [SW] [MW or SW].
  2. Type: [FBX] [FBS] [FBA] [FBX or HBX] [FBS or HBS] [FBA or HBA].
  3. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of [3350 psi] [4150 psi] [4950 psi] [6200 psi] [6600 psi] [8250 psi] <Insert value>.
  4. Initial Rate of Absorption: Less than 30 g/30 sq. in. per minute when tested per ASTMC67.
  5. Efflorescence: Provide brick that has been tested according to ASTMC67 and is rated "not effloresced."
  6. Application: Use where brick is exposed unless otherwise indicated.
  7. [Where shown to "match existing,"]provide face brick matching color range, texture, and size of existing adjacent brickwork.
  8. Insert information on existing brick if known>.

2.4  MORTAR AND GROUT MATERIALS

Retain "Regional Materials" Paragraph below for LEED-NC, LEED-CS, or LEED for SchoolsCreditMR5; before retaining, verify availability of materials that comply.

  1. Regional Materials: Aggregate for mortar and grout,cement, and lime shall be extracted, harvested, or recovered, as well as manufactured, within 500 miles of Project site.
  2. Portland Cement: ASTMC150, TypeI or II, except TypeIII may be used for cold-weather construction. Provide natural color cement unless otherwise directed by the Architect.
  3. Masonry Cement: ASTMC91.
  4. Hydrated Lime: ASTMC207, TypeS.
  5. Portland Cement-Lime Mix: Packaged blend of portland cement complying with ASTMC150, TypeI or TypeIII, and hydrated lime complying with ASTMC207.
  6. Aggregate for Mortar: ASTMC144; except for joints less than 1/4 inch, use aggregate graded with 100 percent passing the No.16 sieve.
  7. Aggregate for Grout: ASTMC404.
  8. Ready-Mixed Mortar: Cementitious materials, water, and aggregate complying with requirements specified in this Article; combined with set-controlling admixtures to produce a ready-mixed mortar complying with ASTMC1142.
  9. Cold-Weather Admixture: Nonchloride, noncorrosive, accelerating admixture complying with ASTMC494, TypeC, and recommended by the manufacturer for use in masonry mortar of composition indicated.
  10. Products: Subject to compliance with requirements, provide one of the following:
  11. Cold-Weather Admixture:

1)  Accelguard 80; Euclid Chemical Co.

2)  Morset; Grace: W.R. Grace & Co.

  1. Water: Potable.

2.5  REINFORCING STEEL

  1. Steel Reinforcing Bars: Material and grade as follows:
  2. Billet steel complying with ASTMA615.
  3. Epoxy-coated billet steel complying with ASTMA615 and ASTMA775.
  4. Grade60.

2.6  JOINT REINFORCEMENT

  1. General: Provide joint reinforcement formed from the following:
  2. Galvanized carbon-steel wire, coating class as follows:
  3. ASTMA153, ClassB-2, for both interior and exterior walls.
  4. Description: Welded-wire units prefabricated with deformed continuous side rods and plain cross rods into straight lengths of not less than 10 feet, with prefabricated corner and tee units, and complying with requirements indicated below:
  5. Wire Diameter for Side Rods: 0.1875 inch.
  6. Wire Diameter for Cross Rods: 0.1875 inch.
  7. For single-wythe masonry, provide type as follows with single pair of side rods:
  8. Truss design with continuous diagonal cross rods spaced not more than 16 inches o.c.

2.7  TIES AND ANCHORS, GENERAL

  1. General: Provide ties and anchors specified in subsequent articles that comply with requirements for metal and size of this Article, unless otherwise indicated.
  2. Steel Plates and Bars: ASTMA36, hot-dip galvanized to comply with ASTMA153, ClassB-1, B-2, or B-3, as applicable to size and form indicated.

2.8  ADJUSTABLE ANCHORS FOR CONNECTING TO STRUCTURAL FRAME

  1. General: Provide 2-piece assemblies as described below, allowing vertical or horizontal differential movement between wall and frame parallel to plane of wall but resisting tension and compression forces perpendicular to it.
  2. For anchorage to steel framing, provide manufacturer's standard anchors with crimped 1/4-inch-diameter wire anchor section for welding to steel and triangular-shaped wire tie section sized to extend within 1 inch of masonry face and as follows:
  3. Wire Diameter: 0.1875 inch.

2.9  RIGID ANCHORS

  1. General: Fabricate from steel bars as follows:
  2. 1-1/2 inches wide by 1/4 inch thick by 24 inches long, with ends turned up 2 inches or with cross pins.

2.10  MISCELLANEOUS MASONRY ACCESSORIES

  1. Compressible Filler: Premolded filler strips complying with ASTMD1056, Type2, ClassA, Grade1; compressible up to 35 percent; of width and thickness indicated; formulated from the following material:
  2. Neoprene.
  3. Preformed Control-Joint Gaskets: Material as indicated below, designed to fit standard sash block and to maintain lateral stability in masonry wall; size and configuration as indicated.
  4. Styrene-Butadiene Rubber Compound: ASTMD2000, Designation M2AA-805.
  5. Bond-Breaker Strips: Asphalt-saturated, organic roofing felt complying with ASTMD226, TypeI (No.15 asphalt felt).
  6. Masonry Cell Insulation: Foamed-in-place, 2-component polymer compound, formaldehyde-free; petrochemical-free; CFC-free; noncorrosive; installed by manufacturer-certified installer.
  7. Thermal Resistance: Not less than 4.5 per ASTM C177.
  8. Water Vapor Permeability: Minimum 14 perms per ASTM C355.
  9. Fire Characteristics when tested per ASTM E84:
  10. Flame Spread: 20 max.
  11. Smoke Developed: 150 max.
  12. Fuel Contributed: 0.
  13. Manufacturers:
  14. C.P. Chemical Co. Inc.
  15. Jesco, Inc.
  16. Tailored Chemical Products, Inc.
  17. Thermal Corp. of America.

2.11  MASONRY CLEANERS