Chrysler LLCConstruction Standards

12/17/04

SECTION 04812 - UNIT MASONRY ASSEMBLIES - EXTERIOR

PART 1 - GENERAL

1.1SUMMARY

  1. This Section includes unit masonry assemblies consisting of the following:
  2. Exterior walls of concrete masonry units (CMUs).
  3. Decorative concrete masonry units.
  4. Mortar and grout.
  5. Reinforcing steel.
  6. Masonry joint reinforcement.
  7. Ties and anchors.
  8. Miscellaneous masonry accessories.
  9. Masonry-cell insulation.
  10. Related Sections include the following:
  11. Division4 Section "Unit Masonry Assemblies" for interior partitions of unit masonry assemblies.
  12. Steel lintels for unit masonry, furnished under Division5 Section "Metal Fabrications."
  13. Division7 Section "Joint Sealants" for sealing control and expansion joints in unit masonry.
  14. Products installed, but not furnished, under this Section include the following:
  15. Loose steel lintels, furnished under Division 5 Section “Metal Fabrications.”
  16. Steel door frames set in unit masonry, furnished under Division8 Section "Steel Doors and Frames."

1.2DEFINITIONS

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

1.3PERFORMANCE REQUIREMENTS

  1. Provide unit masonry that develops indicated net-area compressive strengths (f'm) at 28 days.
  2. 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 Tables1 and 2 in ACI530.1/ASCE6/TMS602.

1.4SUBMITTALS

  1. Product Data: For each type of product indicated.
  2. Shop Drawings: For the following:
  3. Reinforcing Steel: Detail bending and placement of unit masonry reinforcing bars. Comply with ACI315, "Details and Detailing of Concrete Reinforcement."Show elevations of reinforced walls.
  4. Samples for Initial Selection: For the following:
  5. Decorative concrete masonry units, in the form of small-scale units.
  6. Colored mortar.
  7. Samples for Verification: For each type and color of the following:
  8. Decorative concrete masonry units, in the form of full size units.
  9. Accessories embedded in masonry.
  10. Colored mortar.
  11. 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:
  12. Masonry units.
  13. Include material test reports substantiating compliance with requirements.
  14. For masonry units used in structural masonry, include data and calculations establishing average net-area compressive strength of units.
  15. Cementitious materials. Include brand, type, and name of manufacturer.
  16. Preblended, dry mortar mixes. Include description of type and proportions of ingredients.
  17. Reinforcing bars.
  18. Joint reinforcement.
  19. Anchors, ties, and metal accessories.
  20. Mix Designs: For each type of mortarand grout. Include description of type and proportions of ingredients.
  21. Include test reports, per ASTMC780, for mortar mixes required to comply with property specification.
  22. 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 Tables1 and 2 in ACI530.1/ASCE6/TMS602.
  23. Cold-Weather Procedures: Detailed description of methods, materials, and equipment to be used to comply with cold-weather requirements.

1.5QUALITY ASSURANCE

  1. 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.
  2. 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.
  3. Preconstruction Testing Service: Construction Manager may engage a qualified independent testing agency to perform preconstruction testing indicated below. Payment for these services will be made by Construction Manager. Retesting of materials that fail to meet specified requirements shall be done at Contractor's expense.
  4. Concrete Masonry Unit Test: For each type of unit required, per ASTMC140.
  5. Mortar Test (Property Specification): For each mix required, per ASTMC780.
  6. Grout Test (Compressive Strength): For each mix required, per ASTMC1019.
  7. 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 other means, as acceptable to authorities having jurisdiction.
  8. Sample Panels: Build sample panels to verify selections made under sample submittals and to demonstrate aesthetic effects. Comply with requirements in Division 1 Section "Quality Requirements" for mockups.
  9. Build sample panels for typical exterior wall having decorative masonry units in sizes approximately 60 inches long by 48 inches highby full thickness.
  10. Cleanone-half of exposed faces of panels with masonry cleaner indicated.
  11. Protect approved sample panels from the elements with weather-resistant membrane.
  12. Approval of sample panels is for color, texture, and blending of masonry units; relationship of mortar and sealant colors to masonry unit colors; tooling of joints; aesthetic qualities of workmanship; and other material and construction qualities specifically approved by Architect in writing.
  13. Approval of sample panels does not constitute approval of deviations from the Contract Documents contained in sample panels unless such deviations are specifically approved by Architect in writing.
  14. Approved sample panels may become part of the completed Work if undisturbed at time of Substantial Completion.
  15. Preinstallation Conference: Conduct conference at Project site.

1.6DELIVERY, STORAGE, AND HANDLING

  1. 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.
  2. Store cementitious materials on elevated platforms, under cover, and in a dry location. Do not use cementitious materials that have become damp.
  3. Store aggregates where grading and other required characteristics can be maintained and contamination avoided.
  4. 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.
  5. Store masonry accessories, including metal items, to prevent corrosion and accumulation of dirt and oil.

1.7PROJECT CONDITIONS

  1. 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.
  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 from mortar splatter by spreading coverings 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 onto 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 substrates. Remove and replace unit masonry damaged by frost or by freezing conditions. Comply with cold-weather construction requirements contained in ACI530.1/ASCE6/TMS602.
  10. Cold-Weather Cleaning: Use liquid cleaning methods only when air temperature is 40degF and above and will remain so until masonry has dried, but not less than 7 days after completing cleaning.
  11. Hot-Weather Requirements: Comply with hot-weather construction requirements contained in ACI530.1/ASCE6/TMS602.

PART 2 - PRODUCTS

2.1CONCRETE MASONRY UNITS (CMUs)

  1. Shapes: Provide shapes indicated and as follows:
  2. Provide special shapes for lintels, corners, jambs, sashes, movement joints, headers, bonding, and other special conditions.
  3. Provide bullnose units for outside corners, unless otherwise indicated.
  4. Integral Water Repellent: Provide units made with integral water repellent for exterior exposed units.
  5. Integral Water Repellent: Liquid polymeric, 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 ASTME514, with test period extended to 24 hours, show no visible water or leaks on the back of test specimen.
  6. Products:

1)Addiment Incorporated; Block PlusW-10.

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

3)Master Builders, Inc.; Rheopel.

  1. Concrete Masonry Units: ASTMC90.
  2. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 1900psi.
  3. Weight Classification: Normal weight,unless otherwise indicated.
  4. Size (Width): Manufactured to dimensions 3/8 inch less than nominal dimensions.
  5. Exposed Faces: Provide color and texture matching the range represented by Architect/Engineer's sample.
  6. Decorative Concrete Masonry Units: ASTMC90. Exterior face shell (split face) shall not be less than 1 inch for 8 inch units or 11/4 inch for 12 inch units.
  7. Unit Compressive Strength: Provide units with minimum average net-area compressive strength of 1900psi.
  8. Weight Classification: Normal weight,unless otherwise indicated.
  9. Size (Width): Manufactured to dimensions specified in "Concrete Masonry Units" Paragraph above.
  10. Color, Pattern and Texture: As indicated on the Drawings and verified by Architect/Engineer from manufacturer's full range
  11. Special Aggregate: Provide units made with aggregate matching aggregate in Architect/Engineer's sample.

2.2MORTAR AND GROUT MATERIALS

  1. Portland Cement: ASTMC150, TypeI or II, except TypeIII may be used for cold-weather construction. Provide natural color or white cement as required to produce mortar color indicated.
  2. Hydrated Lime: ASTMC207, TypeS.
  3. Portland Cement-Lime Mix: Packaged blend of portland cement complying with ASTMC150, TypeI or TypeIII, and hydrated lime complying with ASTMC207, TypeS.
  4. Mortar Cement: ASTMC1329.
  5. 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.
  6. Products: Match SGS 20X as verified by Architect
  7. Bayer Corporation, Industrial Chemicals Div.; Bayferrox Iron Oxide Pigments.
  8. Davis Colors; True Tone Mortar Colors.
  9. Solomon Grind-Chem Services, Inc.; SGS Mortar Colors.
  10. Aggregate for Mortar: ASTMC144.
  11. For mortar that is exposed to view, use washed aggregate consisting of natural sand or crushed stone.
  12. For joints less than 1/4 inch thick, use aggregate graded with 100 percent passing the No.16 sieve.
  13. Colored-Mortar Aggregates: Natural sand or crushed stone of color necessary to produce required mortar color.
  14. Aggregate for Grout: ASTMC404.
  15. Cold-Weather Admixture: Nonchloride, noncorrosive, accelerating admixture complying with ASTMC494/C494M, TypeC, and recommended by manufacturer for use in masonry mortar of composition indicated.
  16. Products:
  17. Addiment Incorporated; Mortar Kick.
  18. Euclid Chemical Company (The); Accelguard80.
  19. Grace Construction Products, a unit of W. R. Grace & Co. - Conn.; Morset.
  20. Sonneborn, Div. of ChemRex; Trimix-NCA.
  21. Water-Repellent Admixture: Liquid water-repellent mortar admixture intended for use with concrete masonry units, containing integral water repellent by same manufacturer.
  22. Products: Same as used for CMU.
  23. Water: Potable.

2.3REINFORCEMENT

  1. Uncoated Steel Reinforcing Bars: ASTMA615/A615M or ASTMA996/A996M, Grade60.
  2. Masonry Joint Reinforcement, General: ASTMA951.
  3. Exterior Walls: Hot-dip galvanized, carbon steel.
  4. Wire Size for Side Rods: W1.7 or 0.148-inch (9 gage) diameter.
  5. Wire Size for Cross Rods: W1.7 or 0.148-inch (9 gage) diameter.
  6. Provide in lengths of not less than 10 feet,with prefabricated corner and tee units.
  7. Masonry Joint Reinforcement for Single-Wythe Masonry: Ladder type with single pair of side rods.

2.4TIES AND ANCHORS

  1. Materials: Provide ties and anchors specified in subsequent paragraphs that are made from materials that comply with eight subparagraphs below, unless otherwise indicated.
  2. Hot-Dip Galvanized, Carbon-Steel Wire: ASTMA82; with ASTMA153/A153M, ClassB-2 coating.
  3. Stainless-Steel Wire: ASTMA580/A580M, Type304.
  4. Steel Sheet, Galvanized after Fabrication: ASTMA1008/A1008M, Commercial Steel, hot-dip galvanized after fabrication to comply with ASTMA153/A153M.
  5. Stainless-Steel Sheet: ASTMA666, Type304.
  6. Steel Plates, Shapes, and Bars: ASTMA36/A36M.
  7. Stainless Steel bars: ASTMA276 or ASTMa666, Type304.
  8. Wire Ties, General: Unless otherwise indicated, size wire ties to extend at least halfway through veneer but with at least 5/8-inch cover on outside face. Outer ends of wires are bent 90 degrees and extend 2 inches parallel to face of veneer.
  9. Individual Wire Ties: Rectangular units with closed ends and not less than 4 inches wide.
  10. Z-shaped ties with ends bent 90 degrees to provide hooks not less than 2 inches long may be used for masonry constructed from solid units or hollow units laid with cells horizontal.
  11. Wire: Fabricate from 1/4-inch- diameter, hot-dip galvanized steel wire.
  12. Adjustable Anchors for Connecting to Structure: Provide anchors that allow vertical or horizontal adjustment but resist tension and compression forces perpendicular to plane of wall.
  13. Anchor Section for Welding to Steel Frame: Crimped 1/4-inch- diameter, hot-dip galvanized steel wire.
  14. Tie Section: Triangular-shaped wire tie, sized to extend within 1 inch of masonry face, made from 0.188-inch- diameter, hot-dip galvanized steel wire.
  15. Products:
  16. Hohmann & Barnard Inc.; No. 359FH, 12 gage by 3/4 inch wide strap anchor with No. 302, 1 inch flattened tie.
  17. Approved substitute.
  18. Rigid Anchors: Fabricate from steel bars 1-1/2 inches wide by 1/4 inch thick by 24 inches long, with ends turned up 2 inches or with cross pins, unless otherwise indicated.
  19. Corrosion Protection: Hot-dip galvanized to comply with ASTMA153/A153M.

2.5MISCELLANEOUS ANCHORS

  1. Anchor Bolts: Headed or L-shaped steel bolts complying with ASTMA307, GradeA; with ASTMA563 hex nuts and, where indicated, flat washers; hot-dip galvanized to comply with ASTMA153/A153M, ClassC; of dimensions indicated.
  2. Postinstalled Anchors: Provide chemical 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 ASTME488 conducted by a qualified independent testing agency.
  3. Corrosion Protection: Stainless-steel components complying with ASTMF593 and ASTMF594, Alloy Group1 or 2 for bolts and nuts; ASTMA666 or ASTMA276, Type304 or 316, for anchors.

2.6MISCELLANEOUS MASONRY ACCESSORIES

  1. Compressible Filler: Premolded filler strips complying with ASTMD1056, Grade2A1; compressible up to 35 percent; of width and thickness indicated; formulated from neoprene.
  2. Bond-Breaker Strips: Asphalt-saturated, organic roofing felt complying with ASTMD226, TypeI (No.15 asphalt felt).
  3. 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 0.142-inch steel wire, hot-dip galvanized after fabrication. Provide units with either two loops or four loops as needed for number of bars indicated.

2.7MASONRY-CELL INSULATION

  1. Foamed-In-Place Insulation: 2-component polymer compound, installed from top of wall or through holes drilled in interior face; formaldehyde-free; petrochemical-free; CFC-free; noncorrosive; installed by manufacturer-certified installer.
  2. Thermal Resistance: Not less than 4.5 per ASTM C177.
  3. Water Vapor Permeability: Minimum 14 perms per ASTM C355.
  4. Fire Characteristics when tested per ASTM E84:
  5. Flame Spread: 20 max.
  6. Smoke Developed: 150 max.
  7. Fuel Contributed: 0.
  8. Manufacturers:
  9. C.P. Chemical Co. Inc.
  10. Jesco, Inc.
  11. Tailored Chemical Products, Inc.
  12. Thermal Corp. of America.

2.8MASONRY CLEANERS

  1. Cleaners for decorative concrete masonry units:
  2. Diedrich Technologies, Inc.; 202V Vana-Stop.
  3. ProSoCo, Inc.; Custom Masonry Cleaner.
  4. Fabrikem Masonry Cleaner Type L.

2.9MORTAR AND GROUT MIXES

  1. General: Do not use admixtures, including pigments, air-entraining agents, accelerators, retarders, water-repellent agents, antifreeze compounds, or other admixtures, unless otherwise indicated.
  2. Do not use calcium chloride in mortar or grout.
  3. Limit cementitious materials in mortar for exteriorand reinforced masonry to portland cement,mortar cement, and lime.
  4. 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.
  5. 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.
  6. Mortar for Unit Masonry: Comply with ASTMC270, Proportion Specification. Provide the following types of mortar for applications stated unless another type is indicatedor needed to provide required compressive strength of masonry.
  7. For masonry below grade or in contact with earth, use Type S.
  8. For reinforced masonry, use TypeS.
  9. 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 TypeS.
  10. Pigmented Mortar: Proportion pigments with other ingredients to produce color required.
  11. Pigments shall not exceed 10 percent of portland cement by weight.
  12. Pigments shall not exceed 5 percent of mortar cement by weight.
  13. Grout for Unit Masonry: Comply with ASTMC476.
  14. Use grout of type indicated or, if not otherwise indicated, of type (fine or coarse) that will comply with Table1.15.1 in ACI530.1/ASCE6/TMS602 for dimensions of grout spaces and pour height.
  15. Compressive Strength: 2000 psi, minimum.
  16. Provide grout with a slump of 8 to 11 inches as measured according to ASTMC143/C143M.

2.10SOURCE QUALITY CONTROL