Significant factors in the generation of waste in this Section include packing materials, temporary bracing, protection, skill levels, and estimating errors.
SECTION 04200 — UNIT MASONRY
PART 1 — GENERAL
1.01 DESCRIPTION
This section covers ordinary unit masonry work. Insert special work requirements. If repairing older, softer bricks mortar must be softer (increase ratio of lime to cement). Vide: Tuckpointing Notes. If trying to match existing mortar, consider whether texture and color is to be matched before or after cleaning of existing, and/or whether matching of new work is to allow for effects of weathering.
1.02 STANDARDS
In 1996 ASTM C 1329 Standard Specification for Mortar Cement was approved. It has lower air-content limits, minimum bonding strength requirements and is used in structurally demanding applications. Vide: Masonry Construction, Aug. 96.
If joint sealants are specified here refer to ASTM C 920 Standard Specification for Elastomeric Joint Sealants. Vide: Masonry Construction, Dec. 96.
Comply with recommendations of Brick Institute of America (BIA), and National Concrete Masonry Assoc. (NCMA).
If desired, include below. Modify for location, size and type of mockup. See Masterspec for variations and additions.
Prior to installation of masonry work, allowing enough time for thorough setting and curing of mortar, erect sample wall panel to represent completed masonry work, including cleaning, for qualities of appearance, materials and construction. Include each type of exposed unit masonry work. Protect mockup from weather and retain during construction as standard for judging completed masonry work.
1.03 SUBMITTALS
Submit product data for masonry units, cementitious products for mortar and grout, coloring pigments, masonry accessories, and cleaning materials, including material safety data sheets. Submit samples of exposed masonry units and colored pigmented mortar, and copies of manufacturer’s cleaning recommendations.
1.04 JOB CONDITIONS
Do not apply uniform floor or roof loads for at least 12 hours after building masonry walls or columns. Do not apply concentrated loads for at least 3 days after building masonry walls or columns.
Prevent grout or mortar or soil from staining the face of masonry to be left exposed. Remove immediately grout or mortar in contact with such masonry. Protect base of walls from rain-splashed mud and mortar splatter.
As required, mention provisions for cold weather protection or hot weather procedures.
PART 2 — PRODUCTS
2.01 MASONRY UNITS, GENERAL
Provide units of size indicated and in special shapes for applications where forms, size or finish cannot be produced from standard shapes.
Provide uncored or unfrogged units with all exposed surfaces finished for sills, caps and similar applications exposing surfaces otherwise concealed from view.
Preference will be given to masonry units with recycled or waste content.
2.02 FACE BRICK
Materials used in the manufacture of clay brick may incorporate contaminated waste which is neutralized or otherwise rendered inert by a manufacturing process which does not discharge additional pollutants.
ASTM C 216, Grade SW, and as follows:
Retain one type from 3 below:
Type FBS.
Type FBX
Type FBA.
Delete below and insert product name if brick preselected.
Texture and color: Match Architect's sample.
2.03 CONCRETE MASONRY UNITS
Preference will be given to CMU whose manufacture incorporates bottom ash, fly ash and recycled aggregate.
Provide Grade N loadbearing units complying with the following requirements:
Type I.
Delete above or below.
Type II.
Delete below if sample match required or revise for special finish.
Exposed Faces: Manufacturer's standard color and texture, unless otherwise indicated.
Hollow Block: ASTM C 90.
Weight Classification: Lightweight.
Weight Classification: Medium weight.
Weight Classification: Normal weight.
Solid Block: ASTM C 145.
Weight Classification: Lightweight.
Weight Classification: Medium weight.
Weight Classification: Normal weight.
Prefaced Concrete Block: Grade N, Type I lightweight loadbearing units with resinous tile facing complying with ASTM C 744 and the following requirements:
Hollow Block: ASTM C 90.
Solid Block: ASTM C 145.
2.03 MORTAR MATERIALS AND MIXES
Provide mortar complying with ASTM C 270, Proportion Specification, for materials and mortar types of composition indicated below:
Retain one cementitious material from 3 below. If masonry cement mixed with Portland Cement is required for type S or M, add to masonry cement requirement.
Cementitious Material: Portland cement, Type I or Type III, white or natural color as required to produce mortar color indicated, combined with hydrated lime.
Cementitious Material: Masonry cement, white or natural color as required to produce mortar color indicated.
Cementitious Material: Premixed colored masonry cement of formulation required to produce mortar color indicated.
Retain one aggregate from 3 below.
Aggregate: Natural or manufactured sand.
Aggregate: Natural white sand or ground white stone.
Aggregate: Ground marble, granite or other sound stone, as required to produce mortar color indicated.
Delete below if not required.
Colored Mortar Pigments: Natural and synthetic iron oxides and chromium oxides compounded for mortar.
Retain types required from choices below or revise.
Use Type M mortar for masonry below grade and in contact with earth.
Use Type S mortar for reinforced masonry and where indicated.
Use Type N mortar for exterior, above-grade loadbearing and non-loadbearing walls, and for other applications where another type is not indicated.
Do not add admixtures unless otherwise indicated.
Select and proportion pigments with other ingredients to produce mortar color indicated; do not exceed pigment-to-cement ratio of 1-to-10, by weight.
Machine mix to match Architect's sample for color.
2.03 ACCESSORIES
Joint Reinforcement, Ties and Anchoring Devices: Comply with requirements indicated below for basic materials and with those indicated under each item.
Zinc Coated Wire: ASTM A 82 for uncoated wire, ASTM A 641, Class 3 for zinc coating.
Delete above or below. Unless both required, then indicated location and item receiving each.
Hot-Dip Galvanized Wire: ASTM A 82 for uncoated wire, ASTM A 123 for zinc coating applied after prefabrication.
Hot-Dip Galvanized Steel Sheet: Carbon steel hot-dip galvanized after fabrication to comply with ASTM A 153, Class B.
Insert other materials and finishes as required.
Joint Reinforcement: Welded-wire units prefabricated with deformed continuous side rods and plain cross rods into straight lengths of not less than 10' and of widths to fit wall thicknesses indicated, with prefabricated corner and tee units, and as follows:
Wire Size for Side Rods: 0.1483" diameter.
Wire Size for Side Rods: 0.1875" diameter.
Retain one size above and below.
Wire Size for Cross Rods: 0.1483" diameter.
Wire Size for Cross Rods: 0.1875" diameter.
For single wythe masonry provide truss design with single pair of side rods.
Above and below are examples only. Revise to suit project.
For multi-wythe masonry provide ladder design with no. of side rods indicated.
Masonry Veneer Anchors: Two piece assemblies consisting of 0.1875" diameter wire tie section and 0.1046" thick sheet steel anchor section.
Product: Subject to compliance with requirements, provide one of the following products:
DW-10; Hohmann & Barnard, Inc.
D/A 213 Assembly; Dur-O–Wall, Inc.
Masonry Wire Ties: 3/16" cold-drawn steel wire, with 1.5 oz. hot-dip zinc coating, Z-shaped for solid unit masonry or rectangular shape for hollow unit masonry.
Miscellaneous Masonry Anchors: Fabricated from 16-gage steel sheet or 3/8" steel rod, 1.5 oz. hot-dip zinc coating after fabrication.
Select flashing(s) to suit project.
Concealed Flashing Materials: Provide materials as follows:
Copper Laminated Flashing: Sheet copper of weight indicated below, coated with flexible fibrated asphalt.
Weight: 3 oz.
Weight: 5 oz.
Weight: 7 oz.
Stainless Steel Masonry Flashing: ASTM A 167 Type 304, dead soft, 0.015" thick sheet, deformed for 2-direction mechanical bond wherever used as through-wall flashing.
Copper Masonry Flashing: ASTM B 370, H100 temper (cold-rolled), 10 oz. sheet, deformed for 2-direction mechanical bond wherever used as through-wall flashing.
Lead coated Copper Flashing:
Aluminum Flashing:
Galvanized Steel Flashing:
Rubberized Asphalt Flashing:
Plastic coated Fiberglass Flashing:
Vinyl Masonry Flashing: PVC with plasticizers and modifiers, formed into a 20 mil flexible sheet.
Below intended as a wall "spline", not simple joint filler for CMUs work.
Premolded Control Joint Strips: Solid rubber of profile as indicated (to maintain lateral stability of wall), 60 - 80 Shore A hardness.
Weepholes: Polyethylene plastic tubing, 1/4" x 4".
Delete above or below.
Weepholes: Cotton sash cord of length required to produce 2" exposure on exterior and 18" in cavity between wythes.
2.04 JOINT SEALERS
Include if no Section 07900. Note re: Masonry joint sealers: Some silicone sealants bleed silicone oil which can permanently stain masonry units. Some tend to collect more dirt than polyurethane sealants, which can be visually significant, especially with light colored masonry, mortar, or sealants. (In 1996 there are “clean seal” products available.) High quality silicone sealants weather better than polyurethane, but polyurethanes are most often specified as masonry joint sealers for appearance.
See also “Selecting a Joint Sealant” in Masonry Construction Dec 96.
2.05 INSULATION
Select insulations to suit project.
Loose Granular Perlite Insulation: ASTM C 549, Type II and III, treated with silicone for water repellency.
Loose Granular Vermiculite Insulation: ASTM C 516, Type II Grade 3.
Extruded Polystyrene Board Insulation: ASTM C 578, Type IV, with closed cells and integral high density skin, formed by expansion of polystyrene base resin in an extrusion process. Use only brands manufactured without CFC blowing agents and with a minimum of 50% recycled polystyrene resins.
At this time the following product has recycled content (50% min.)…
Amofoam®-RCY by Amoco Foam Products, 375 Northridge Road, Suite 600, Atlanta GA 30350, (800) 241-4402.
PART 3 — EXECUTION
3.01 INSTALLATION
Install masonry units in the bond pattern indicated, or if none is indicated, in running bond.
Cut exposed masonry units, where necessary, with a power saw. Avoid the use (by proper layout) of less-than-half-size units.
Wet brick of high absorption, prior to laying.
Bond intersecting walls with masonry units or provide anchors spaced 24".
Hold uniform joint sizes as indicated, or if not indicated, hold joint sizes to suit modular size of masonry units.
Cut joints flush and tool slightly concave, unless otherwise indicated.
Keep cavities clean of mortar droppings, and install ties spaced 16" vertically and 24" horizontally. Provide weep holes spaced 24" apart at the bottom of (and at ledges in) cavities.
Pour granular insulation into cavities of cavity walls and, where indicated, if any, of cores in hollow masonry units.
Delete above or below if none.
Install board insulation of thickness indicated, in cavities at cavity walls with boards pressed firmly and adhesively applied against inside wythes of masonry. Fit boards between wall ties and with edges butted tightly.
Reinforce horizontal joints with continuous masonry joint reinforcement, spaced 16" vertically; except spaced 24" if not acting as wythe ties; and except spaced 8" in parapet walls, and immediately above and below openings, for a distance of 2' beyond jambs of opening. Do not bridge control and expansion joints in the wall system.
Anchor ends of walls to structure with anchors spaced 24", except as otherwise shown.
Provide control and expansion joints at locations shown, and keep clean of mortar droppings.
Show joint locations on drawings.
Provide concealed flashing in exterior masonry work as indicated.
Except as otherwise shown, provide flashing under copings and sills, through wall at counterflashing locations, and above elements of structural support for masonry.
Build other work into the masonry work as shown, fitting masonry units around other work, and grouting for secure anchorage.
3.02 WASTE MANAGEMENT
Separate and recycle waste materials to the maximum extent economically feasible. Place materials defined as hazardous or toxic waste in designated containers.
Use trigger operated spray nozzles for water hoses.
Fold up metal banding, flatten, and place in designated area for recycling. Collect wood packing shims and pallets and place in designated area.
Place unused mixed mortar in designated locations where lower strength mortar meets the requirements for bulk fill, for example, use as retaining wall footing ballast, cavity fill at grade or underground utility pipe kickers.
Edit according to project requirements…
Separate masonry waste and place in designated area for use as structural fill.
Separate selected masonry waste and excess for landscape uses, either whole or crushed as ground cover.
3.03 PROTECTION
Protect newly laid masonry from exposure to precipitation, excessive drying, freezing, soiling, backfill and other harmful elements.
Dry-brush masonry work at end of each day's work.
3.04 FINAL CLEANING
Test cleaning methods on sample panels before proceeding with cleaning of entire masonry work. Clean concrete unit masonry to comply with masonry manufacturer's directions and applicable NCMA "Tek" bulletins.
After mortar is thoroughly set and cured, clean masonry as follows:
Remove large mortar particles by hand with wooden paddles and non-metallic scrape hoes or chisels.
Clean brick masonry by bucket and brush hand cleaning method described in BIA "Technical Note No. 20 Revised" using the following cleaner:
Detergent.
Delete above or below.
Acidic cleaner approved by unit masonry manufacturer.
END OF SECTION 04200
UNIT MASONRY 04200-#
courtesy of Design Coalition, Architects. , Madison, Wisconsin, USA ~~ www.designcoalition.org