Chrysler LLCConstruction Standards

12/17/04

SECTION 04810 - UNIT MASONRY ASSEMBLIES - INTERIOR

PART 1 - GENERAL

1.1SUMMARY

  1. This Section includes interior partitions of concrete unit masonry.
  2. Products furnished but not installed under this Section include the following:
  3. Division5 Section "Metal Fabrications" for anchor sections of adjustable masonry anchors for connecting to structural frame.
  4. Products installed but not furnished under this Section include the following:
  5. Division5 Section "Metal Fabrications" for steel lintels.
  6. Division6 Section "Miscellaneous Carpentry." for wood nailers and blocking.

1.2SUBMITTALS

  1. Product data for each different masonry unit, accessory, and other manufactured product specified.

1.3QUALITY 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.

1.4DELIVERY, 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.

1.5PROJECT 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 mi./h.
  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

2.1MANUFACTURERS

  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.

2.2CONCRETE MASONRY UNITS

  1. General: Provide shapes indicated and as follows for each form of concrete masonry unit required.
  2. Provide special shapes for lintels, corners, jambs, sash, control joints, headers, bonding, and other special conditions.
  3. Provide bullnose units for outside corners, unless otherwise indicated.
  4. Concrete Masonry Units: ASTMC90 and as follows:
  5. Unit Compressive Strength: Provide units with minimum average net-area compressive strength indicated below:
  6. 1900 psi.
  7. Weight Classification: Lightweight.
  8. Aggregates: Do not use aggregates made from pumice, scoria, or tuff.
  9. Provide TypeI, moisture-controlled units.
  10. Exposed Faces: Manufacturer's standard color and texture, unless otherwise indicated.
  11. 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.
  12. 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.
  13. Where units do not have sound-absorbing filler, only the metal septum shall be installed.
  14. Products:
  15. Proudfoot Co.; Soundblox
  16. Trenwyth Industries, Inc.; Acousta-Wal

2.3MORTAR AND GROUT MATERIALS

  1. 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.
  2. Masonry Cement: ASTMC91.
  3. Hydrated Lime: ASTMC207, TypeS.
  4. Portland Cement-Lime Mix: Packaged blend of portland cement complying with ASTMC150, TypeI or TypeIII, and hydrated lime complying with ASTMC207.
  5. Aggregate for Mortar: ASTMC144; except for joints less than 1/4 inch, use aggregate graded with 100 percent passing the No.16 sieve.
  6. Aggregate for Grout: ASTMC404.
  7. 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.
  8. Cold-Weather Admixture: Nonchloride, noncorrosive, accelerating admixture complying with ASTMC494, TypeC, and recommended by the manufacturer for use in masonry mortar of composition indicated.
  9. Water: Potable.
  10. Products: Subject to compliance with requirements, provide one of the following:
  11. Cold-Weather Admixture:
  12. Accelguard 80; Euclid Chemical Co.
  13. Morset; Grace: W.R. Grace & Co.
  14. Water-Repellent Admixture:
  15. Dry-Block Mortar Admixture; Grace: W.R. Grace & Co.

2.4REINFORCING 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.

2.5JOINT 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.

2.6TIES 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.

2.7ADJUSTABLE 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.

2.8RIGID 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.

2.9MISCELLANEOUS 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.

2.10MASONRY CLEANERS

  1. Job-Mixed Detergent Solution: Solution of 1/2-cup dry measure tetrasodium polyphosphate and 1/2-cup dry measure laundry detergent dissolved in 1 gal. of water.

2.11MORTAR 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. Add cold-weather admixture (if used) at the same rate for all mortar, regardless of weather conditions, in order to ensure that mortar color is consistent.
  4. Mortar for Unit Masonry: Comply with ASTMC270, Proportion Specification, for job-mixed mortar; and ASTMC1142 for ready-mixed mortar, Type S or RS.
  5. Grout for Unit Masonry: Comply with ASTMC476. Use grout of consistency indicated or, if not otherwise indicated, of consistency (fine or coarse) at time of placement that will completely fill spaces intended to receive grout.
  6. Use fine grout in grout spaces less than 2 inches in horizontal dimension, unless otherwise indicated.
  7. Use coarse grout in grout spaces 2 inches or more in least horizontal dimension, unless otherwise indicated.

PART 3 - EXECUTION

3.1INSTALLATION, GENERAL

  1. Build chases and recesses to accommodate items specified in this and other Sections of the Specifications.
  2. Leave openings for equipment to be installed before completion of masonry. After installing equipment, complete masonry to match construction immediately adjacent to the opening.
  3. Cut masonry units with motor-driven saws to provide clean, sharp, unchipped edges. Cut units as required to provide continuous pattern and to fit adjoining construction. Use full-size units without cutting, where possible. Allow units cut with water-cooled saws to dry before placing, unless wetting of units is specified. Install cut units with cut surfaces and, where possible, cut edges concealed.

3.2CONSTRUCTION TOLERANCES

  1. Variation from Plumb: For vertical lines and surfaces of columns, walls, and arises, do not exceed 1/4 inch in 10 feet, nor 3/8 inch in 20 feet, nor 1/2 inch in 40 feet or more. For external corners, expansion joints, control joints, and other conspicuous lines, do not exceed 1/4 inch in 20 feet, nor 1/2 inch in 40 feet or more. For vertical alignment of head joints, do not exceed plus or minus 1/4 inch in 10 feet, nor 1/2 inch maximum.
  2. Variation from Level: For bed joints and lines of exposed lintels, sills, parapets, horizontal grooves, and other conspicuous lines, do not exceed 1/4 inch in 20 feet, nor 1/2 inch in 40 feet or more. For top surface of bearing walls, do not exceed 1/8 inch in 10 feet, nor 1/16 inch within width of a single unit.
  3. Variation of Linear Building Line: For position shown in plan and related portion of columns, walls, and partitions, do not exceed 1/2 inch in 20 feet, nor 3/4 inch in 40 feet or more.
  4. Variation in Cross-Sectional Dimensions: For columns and thickness of walls, from dimensions shown, do not exceed minus 1/4 inch nor plus 1/2 inch.
  5. Variation in Mortar-Joint Thickness: Do not vary from bed-joint thickness indicated by more than plus or minus 1/8 inch, with a maximum thickness limited to 1/2 inch. Do not vary bed-joint thickness from bed-joint thickness of adjacent course by more than 1/8 inch. Do not vary from head-joint thickness indicated by more than plus or minus 1/8 inch. Do not vary head-joint thickness from adjacent head-joint thickness by more than 1/8 inch. Do not vary from collar-joint thickness indicated by more than minus 1/4 inch or plus 3/8 inch.

3.3LAYING MASONRY WALLS

  1. Lay out walls in advance for accurate spacing of surface bond patterns with uniform joint widths and for accurate locating of openings, movement-type joints, returns, and offsets. Avoid the use of less-than-half-size units at corners, jambs, and where possible at other locations.
  2. Lay walls to comply with specified construction tolerances, with courses accurately spaced and coordinated with other construction.
  3. Bond Pattern for Exposed Masonry: Lay exposed masonry in the following bond pattern; do not use units with less than nominal 4-inch horizontal face dimensions at corners or jambs.
  4. One-half running bond with vertical joint in each course centered on units in courses above and below.
  5. 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.
  6. Stopping and Resuming Work: In each course, rack back 1/2-unit length for one-half running bond or 1/3-unit length for one-third running bond; do not tooth. Clean exposed surfaces of set masonry, wet clay masonry units lightly if required, and remove loose masonry units and mortar prior to laying fresh masonry.
  7. Built-in Work: As construction progresses, build-in items specified under this and other Sections of the Specifications. Fill in solidly with masonry around built-in items.
  8. Fill space between hollow metal frames and masonry solidly with mortar, unless otherwise indicated.
  9. At exterior frames, insert extruded polystyrene board insulation around perimeter of frame in thickness indicated, but not less than 3/4 inch to act as a thermal break between frame and masonry.
  10. Where built-in items are to be embedded in cores of hollow masonry units, place a layer of metal lath in the joint below and rod mortar or grout into core.
  11. Fill cores in hollow concrete masonry units with grout 24 inches under bearing plates, beams, lintels, posts, and similar items, unless otherwise indicated.
  12. Build nonload-bearing interior partitions full height of story to underside of solid floor or roof structure above and as follows:
  13. Install compressible filler in joint between top of partition and underside of structure above.
  14. Acoustical Units: Lay with the open ends of the cavities facing downward. Slots shall be to the side as indicated or directed; exposed to the area where the sound absorption is desired. Care shall be taken to keep the slots free of mortar or debris above the mortar joints. Lines shall be straight and true.

3.4MORTAR BEDDING AND JOINTING