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SECTION 09 24 00
PORTLAND CEMENT PLASTERING
 
 
Copyright 2013 - 2016 ARCAT, Inc. - All rights reserved
** NOTE TO SPECIFIER ** Vinyl Corp.; beads, trims and control joints for Stucco/Plaster, Drywall, Exterior Insulation Finish Systems (EIFS), and Direct-applied Exterior Finish Systems (DEFS).
.
This section is based on the products of Vinyl Corp., which is located at:
8000 N. W. 79th Pl.
Miami, FL 33166
Toll Free Tel: 800-648-4695
Tel: 305-477-6464
Fax: 305-477-4108
Email: request info (sam.maldonado@vinylcorp.com)
Web: www.vinylcorp.com
[ Click Here ] for additional information.
Vinyl Corp. is one of the largest full line vinyl bead and trim manufacturers in the U.S. Product categories include beads, trims and control joints for Stucco/Plaster, Drywall, Exterior Insulation Finish Systems (EIFS), and Direct-applied Exterior Finish Systems (DEFS).The company was formed in 1988 with two extrusion lines, twenty products and approximately six employees. Today the company has over 600 products and 50 employees at the Hialeah, Florida facility. Vinyl Corp. is known in the industry as "Innovators of Vinyl Wall and Ceiling Accessories." Using only virgin vinyl material, they are also #1 in quality!
Why Choose Us? Vinyl Corp. is committed to meeting the most complex challenges in the wall and ceiling industry through innovative product design, exacting manufacturing tolerances, and the most complete selection of accessories in the industry. Through our progressive approach to engineering and manufacturing, we've created innovative accessories and set the quality standard for product excellence. Vinyl Corp. is a division of ClarkDietrich Building Systems, a company that believes peak performance is only achieved if quality is uncompromised every step of the way. We continue to raise the bar through innovative product design, exacting manufacturing tolerances, precise specification and state-of-the-art manufacturing equipment.
In an industry full of choices, why select Vinyl Corp. for your vinyl wall and ceiling accessories?
We use only lead-free, virgin vinyl compounds
- All of our exterior products meet ASTM D-1784, and are designed for application, performance and reliability.
- All of our interior products meet ASTM C-1047, providing durability and impact resistance.
- All of our interior products, pass ASTM E-84 Steiner Smoke and Fire Spread Tests.
- All our products are impervious to rust, corrosion and are electrolysis free.
- They are not damaged by masonry cement additives, magnesium oxychloride cements or calcium chloride additives.
Lead-free virgin vinyl accessories from Vinyl Corp. Why would you choose anything else?
 
PART 1 GENERAL
 
1.1
SECTION INCLUDES
A.
Interior Portland cement plasterwork and accessories.
B.
Exterior Portland cement plasterwork (stucco) and accessories.
1.2
RELATED SECTIONS
A.
Section 05 40 00 - Cold-Formed Metal Framing.
B.
Section 06 10 00 - Rough Carpentry.
C.
Section 06 16 36 - Wood Panel Product Sheathing.
D.
Section 07 21 26 - Blown Insulation.
E.
Section 09 22 00 - Supports for Plaster and Gypsum Board.
1.3
REFERENCES
A.
ASTM International (ASTM):
1.
ASTM A 641/A 641M - Standard Specification for Zinc-Coated (Galvanized) Carbon Steel Wire.
2.
ASTM A 653/A 653M - HYPERLINK "http://www.astm.org/Standards/A653.htm"Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process.
3.
ASTM B 69 - Standard Specification for Rolled Zinc.
4.
ASTM C 91 - Standard Specification for Masonry Cement.
5.
ASTM C 150 - Standard Specification for Portland Cement.
6.
ASTM C 206 - Standard Specification for Finishing Hydrated Lime.
7.
ASTM C 207 - Standard Specification for Hydrated Lime for Masonry Purposes.
8.
ASTM C 665 - Standard Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing.
9.
ASTM C 847 - Standard Specification for Metal Lath.
10.
ASTM C 897 - Standard Specification for Aggregate for Job-Mixed Portland Cement-Based Plasters.
11.
ASTM C 926 - Standard Specification for Application of Portland Cement-Based Plaster.
12.
ASTM C 932 - Standard Specification for Surface-Applied Bonding Compounds for Exterior Plastering.
13.
ASTM C 933 - Standard Specification for Welded Wire Lath.
14.
ASTM C 954 - Standard Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in Thickness.
15.
ASTM C 1002 - Standard Specification for Steel Self-Piercing Tapping Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel Studs.
16.
ASTM C 1047 - Standard Specification for Accessories for Gypsum Wallboard and Gypsum Veneer Base.
17.
ASTM C 1063 - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster.
18.
ASTM C 1328 - Standard Specification for Plastic (Stucco) Cement.
19.
ASTM D 1784 - Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds.
20.
ASTM E 90 - Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements.
21.
ASTM E 119 - Standard Test Methods for Fire Tests of Building Construction and Materials.
22.
ASTM E 413 - Classification for Rating Sound Insulation.
1.4
SUBMITTALS
A.
Submit under provisions of Section 01 30 00 - Administrative Requirements.
B.
Product Data: Manufacturer's data sheets on each product to be used, including:
1.
Preparation instructions and recommendations.
2.
Storage and handling requirements and recommendations.
3.
Installation methods.
C.
Shop Drawings: Show locations and installation of control and expansion joints including plans, elevations, sections, details of components, and attachments to other work, based on architectural drawings.
 
** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected.
 
D.
Selection Samples: For each finish product specified, two complete sets of color chips representing manufacturer's full range of available colors and patterns.
E.
Verification Samples: For each finish product specified, two samples, minimum size 6 inches (150 mm) square, representing actual product, color, and patterns.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
F.
LEED Submittals:
1.
Product Data for Credit MR 4.1and Credit MR 4.2: For products having recycled content, documentation indicating percentages by weight of postconsumer and preconsumer recycled content. Include statement indicating cost for each product having recycled content. MR 4.1 and MR 4.2 excludes products fabricated from rigid PVC or CPVC plastic.
2.
Product Data for Credit MR 2.1 and Credit MR 2.2: For products diverted from disposal in landfills and incinerators, and where recycled resources are directed back to the manufacturing process. Include statement indicating percentage of materials diverted and recycled, and the costs associated with each. MR 2.1 and MR 2.2 excludes products fabricated from rigid PVC or CPVC plastic.
3.
Product Data for Credit MR 5: For products where product manufacturing is within a 500 mile radius of the jobsite and the point of extraction of the raw materials. Include a statement indicating the location and distances for the manufacturing plant and the point of extraction of raw materials in relation to the jobsite location.
4.
Product Data for Credit IEQ 4.1: For sealants, documentation including printed statement of VOC content.
5.
Laboratory Test Reports for Credit IEQ 4: For sealants, documentation indicating that products comply with the testing and product requirements of the California Department of Health Services' "Standard Practice for the Testing of Volatile Organic Emissions from Various Sources Using Small-Scale Environmental Chambers".
1.5
QUALITY ASSURANCE
A.
Installer Qualifications: Experienced installer of lathing and plastering systems with familiarity with manufacturer's products scheduled for the Work.
B.
Fire-Resistance Ratings: Where indicated, provide Portland cement plaster assemblies identical to those of assemblies tested for fire resistance per ASTM E 119 by, and displaying a classification label from, a qualified independent testing agency acceptable to the authority having jurisdiction. Identify products with appropriate markings of applicable testing agency.
1.
Construct fire-resistance rated partitions in compliance with tested assembly requirements indicated on drawings.
2.
Rated assemblies shall be substantiated from applicable testing using proposed products, by Contractor.
3.
Both metal framing and wallboard manufacturers shall submit written confirmation that it accepts the other manufacturer's product as a suitable component in the assembly. Acceptance is as follows:
a.
If installation of both products is proper, no adverse effect will result in the performance of one manufacturer's product by the other's product.
b.
Combining products can be substantiated by required assembly tests.
4.
Indicate design designations from UL's "Fire Resistance Directory" or from the listings of another qualified testing agency.
C.
Sound-Transmission Characteristics: Where indicated, provide Portland cement plaster assemblies identical to those of assemblies tested for STC ratings per ASTM E 90 and classified according to ASTM E 413 by a qualified testing agency.
D.
Mockups: Before plastering, install mockups of at least 100 sf (9.3 sq. m) in surface area to demonstrate aesthetic effects and set quality standards for materials and execution.
1.
Install mockups for each type of finish indicated.
2.
For interior plasterwork, simulate finished lighting conditions for review of mockups.
3.
Approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.
E.
Preinstallation Conference: Conduct conference at Project site.
1.6
DELIVERY, STORAGE, AND HANDLING
A.
Store materials inside under cover and keep them dry and protected against damage from weather, direct sunlight, surface contamination, corrosion, construction traffic, and other causes.
B.
Protect cold-formed metal framing from corrosion, deformation, and other damage during delivery, storage, and handling as required by AISI's "Code of Standard Practice".
1.7
PROJECT CONDITIONS
A.
Comply with ASTM C 926 requirements.
B.
Interior Plasterwork: Maintain room temperatures at greater than 40 degree F (4.4 degree C) for at least 48 hours before plaster application, and continuously during and after application.
1.
Avoid conditions that result in plaster drying out during curing period. Distribute heat evenly; prevent concentrated or uneven heat on plaster.
2.
Ventilate building spaces as required to remove water in excess of that required for hydrating plaster in a manner that prevents drafts of air from contacting surfaces during plaster application and until plaster is dry.
C.
Exterior Plasterwork:
1.
Apply and cure plaster to prevent plaster drying out during curing period. Use procedures required by climatic conditions, including moist curing, providing coverings, and providing barriers to deflect sunlight and wind.
2.
Apply plaster when ambient temperature is greater than 40 degree F (4.4 degree C).
3.
Protect plaster coats from freezing for not less than 48 hours after set of plaster coat has occurred.
D.
Factory-Prepared Finishes: Comply with manufacturer's written recommendations for environmental conditions for applying finishes.
PART 2 PRODUCTS
 
2.1
MANUFACTURERS
A.
Acceptable Manufacturer: Vinyl Corp., which is located at: 8000 N. W. 79th Pl.; Miami, FL 33166; Toll Free Tel: 800-648-4695; Tel: 305-477-6464; Fax: 305-477-4108; Email: request info (sam.maldonado@vinylcorp.com); Web: www.vinylcorp.com
 
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
 
B.
Substitutions: Not permitted.
C.
Requests for substitutions will be considered in accordance with provisions of Section 01 60 00 - Product Requirements.
2.2
MATERIALS
A.
Accessories for Gypsum Wallboard and Gypsum Veneer Base: ASTM C 1047.
B.
Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster: ASTM C 1063.
C.
Rigid Poly (Vinyl Chloride) (PVC) Compounds and Chlorinated Poly (Vinyl Chloride) (CPVC) Compounds: ASTM D 1784.
2.3
METAL LATH
A.
Expanded-Metal Lath: ASTM C 847, cold-rolled carbon steel sheet, ASTM A 653/A 653M, G60 (Z180).
1.
Basis-of-Design Product: ClarkDietrich Building Systems.
B.
Wire Lath: ASTM C933, Class 1 Galvanized Coating complying with ASTM A 641.
1.
Basis-of-Design Product: Structa Wire Corp. products by ClarkDietrich Building Systems.
2.4
ACCESSORlES
 
** NOTE TO SPECIFIER ** Delete if not required.
 
A.
Plastic Accessories for Gypsum Wallboard and Gypsum Veneer Base: ASTM C 1047. Fabricated from plastic or plastic and paper in combination shall be manufactured from rigid PVC, ABS, PETG, high-impact polystyrene (HIPS), or polycarbonate (PC) plastic not less than 0.028 inch (0.7112 mm) and Section 4.3.1 PVC specification D 1784 Cell class 13244C.
1.
Basis-of-Design Product: Vinyl Corp.
 
** NOTE TO SPECIFIER ** Delete products not required.
 
2.
Corner Beads:
a.
Vinyl Corp. "VLCB".
b.
Vinyl Corp. "VBCB".
3.
Channel Reveals: PVC reveals conforming to ASTM C 1047.
a.
Vinyl Corp. "DC-Series".
4.
Soffit Vents: Vinyl soffit vent.
a.
Vinyl Corp. "DCV-Series".
5.
Control Joints:
a.
Vinyl Corp. "CJV-Series".
 
** NOTE TO SPECIFIER ** Delete if not required.
 
B.
Plastic Accessories for Exterior Stucco: ASTM C 1063. Fabricated from plastic or plastic and paper in combination shall be manufactured from rigid PVC, ABS, PETG, high-impact polystyrene (HIPS), or polycarbonate (PC) plastic. Section 4.3.1 PVC specification D 1784 Cell class 13244C.
1.
Basis-of-Design Product: Vinyl Corp.
2.
Corner Beads:
a.
Vinyl Corp. "#1 Series".
 
** NOTE TO SPECIFIER ** Delete products not required.
 
3.
Casing Beads:
a.
Vinyl Corp. "66-Series".
4.
Control Joints:
a.
Vinyl Corp. "15-Series".
5.
Soffit Vents:
a.
Vinyl Corp. "V-Series".
b.
Vinyl Corp. "CS-V Series".
6.
Channel Reveals:
a.
Vinyl Corp: "CS Series".
7.
Weep Screed:
a.
Vinyl Corp. "WS- Series".
C.
Metal Accessories: Comply with ASTM A 653/A 653M, G60 (Z180).
1.
Basis-of-Design Product: ClarkDietrich Building Systems.
D.
Zinc Accessories for Portland Cement Base Plaster. ASTM B 69. Fabricated from Zinc Alloy (99 percent pure zinc).
1.
Basis-of-Design Product: ClarkDietrich Building Systems.
2.5
MISCELLANEOUS MATERlALS
 
** NOTE TO SPECIFIER ** Water containing salt, alum, or plaster residue accelerates plaster set and may cause efflorescence. Water containing organic or vegetable matter may retard plaster set, cause staining, and interfere with plaster bond.
 
A.
Water for Mixing: Potable and free of substances capable of affecting plaster set or of damaging plaster, lath, or accessories.
 
** NOTE TO SPECIFIER ** Fibers can be added to plaster base-coat mixes to increase cohesiveness, tensile strength, and impact resistance and to reduce shrinkage. Delete if not required.
 
B.
Fiber for Base Coat: Alkaline-resistant glass or polypropylene fibers, 1/2 inch (13 mm) long, free of contaminants, manufactured for use in Portland cement plaster.
 
** NOTE TO SPECIFIER ** Retain bonding compound in first paragraph below where plaster is adhered to structurally sound unit masonry or monolithic concrete. Delete if not required.
 
C.
Bonding Compound: ASTM C 932.
D.
Steel Drill Screws: For metal-to-metal fastening, ASTM C 1002 or ASTM C 954, as required by thickness of metal being fastened; with pan head that is suitable for application; in lengths required to achieve penetration through joined materials of no fewer than three exposed threads.
E.
Fasteners for Attaching Metal Lath to Substrates: Complying with ASTM C 1063.
 
** NOTE TO SPECIFIER ** Generally retain first paragraph below. Wire, in various diameters, is used for tying expanded-metal lath to framing and supports.
 
F.
Wire: ASTM A 641/A 641M, Class 1 zinc coating, soft temper, not less than 0.0475-inch (1.21-mm) diameter, unless otherwise indicated.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
G.
Sound Attenuation Blankets: ASTM C 665, Type I (blankets without membrane facing) produced by combining thermosetting resins with mineral fibers manufactured from glass, slag wool, or rock wool.
1.
Fire-Resistance-Rated Assemblies: Comply with mineral-fiber requirements of assembly.
 
** NOTE TO SPECIFIER ** Retain "Recycled Content" Subparagraph below to specify recycled content if applying for LEED Credit MR 4. An alternative method of dealing with these credit requirements is to retain requirement in Division 1 - Section "Sustainable Design Requirements" that gives Contractor the option and responsibility to determine how these credit requirements will be met.
 
2.
Recycled Content: Postconsumer recycled content plus one-half of preconsumer recycled content not less than ___ percent by weight.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
H.
Acoustical Sealant:
1.
As specified in Section 07 91 26 - Joint Fillers - Joint Sealants.
 
** NOTE TO SPECIFIER ** Retain first subparagraph below if required for LEED-NC, LEED-CI, or LEED-CS Credit IEQ 4.1. VOC content limit is that for architectural sealants.
 
2.
Sealants shall have a VOC content of 250 g/L or less when calculated according to 40 CFR 59, Subpart D (EPA Method 24).
 
** NOTE TO SPECIFIER ** Retain subparagraph below if required for LEED for Schools Credit IEQ 4.
 
3.
Sealants shall comply with the testing and product requirements of the California Department of Health Services' "Standard Practice for the Testing of Volatile Organic Emissions from Various Sources Using Small-Scale Environmental Chambers."
2.6
PLASTER MATERlAL
 
** NOTE TO SPECIFIER ** Retain Type II below if sulfate resistance is required. Delete cement not required.
 
A.
Portland Cement: ASTM C 150, Type I.
B.
Portland Cement: ASTM C 150, Type II.
C.
Masonry Cement: ASTM C 91, Type N.
 
** NOTE TO SPECIFIER ** Retain first paragraph below only after verifying availability.
 
D.
Plastic Cement: ASTM C 1328.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
E.
Colorants for Job-Mixed Finish Coats: Colorfast mineral pigments that produce finish plaster color to match Architect's sample.
F.
Lime: ASTM C 206, Type S; or ASTM C 207, Type S.
G.
Sand Aggregate: ASTM C 897.
 
** NOTE TO SPECIFIER ** Delete color requirement not required.
 
1.
Color for Job-Mixed Finish Coats: White.
2.
Color for Job-Mixed Finish Coats: In color matching Architect's sample.
 
** NOTE TO SPECIFIER ** Fire-resistance-rated Portland cement plaster assemblies require lightweight perlite aggregate rather than sand. Delete if not required.
 
H.
Perlite Aggregate: ASTM C 35.
 
** NOTE TO SPECIFIER ** Exposed aggregates such as washed gravel, granite, and colored glass can be used in finish coats; large stones can also be hand placed in finish coats. Option in first paragraph below is an example only, based on marblecrete finish.
 
I.
Exposed Aggregates for Finish Coats: For marblecrete finish, clean, sound, crushed marble matching color and size gradation of Architect's sample.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
J.
Ready-Mixed Finish-Coat Plaster: Mill-mixed Portland cement, aggregates, coloring agents, and proprietary ingredients.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
K.
Acrylic-Based Finish Coatings: Factory-mixed acrylic-emulsion coating systems, formulated with colorfast mineral pigments and fine aggregates; for use over Portland cement plaster base coats. Include manufacturer's recommended primers and sealing topcoats for acrylic-based finishes.
2.7
PLASTER MIXES
A.
General: Comply with ASTM C 926 for applications indicated.
 
** NOTE TO SPECIFIER ** Retain subparagraph below for greater plaster strength and crack resistance. Delete if not required.
 
1.
Fiber Content: Add fiber to base-coat mixes after ingredients have mixed at least two minutes. Comply with fiber manufacturer's written instructions for fiber quantities in mixes, but do not exceed 1 lb of fiber/cu. yd. (0.6 kg of fiber/cu. m) of cementitious materials.
 
** NOTE TO SPECIFIER ** If retaining perlite aggregate for fire-resistance-rated assemblies, insert mix requirements for perlite-aggregate plaster. Retain applicable base coats in first three paragraphs below or insert others to suit Project. Coordinate with requirements retained in "Plaster Materials" Article. Delete if not required.
 
B.
Base-Coat Mixes for Use over Metal Lath: Scratch and brown coats for three-coat plasterwork as follows:
1.
Portland Cement Mixes:
 
** NOTE TO SPECIFIER ** Decreasing the proportion of lime in the cementitious-material mix produces a harder surface but increases the possibility of cracking.
 
a.
Scratch Coat:
 
** NOTE TO SPECIFIER ** Delete mix proportion not required.
 
1)
For cementitious material, mix 1 part Portland cement and 0 to 3/4 parts lime.
2)
For cementitious material, mix 1 part Portland cement and 3/4 to 1-1/2 parts lime.
3)
Use 2-1/2 to 4 parts aggregate per part of cementitious material.
b.
Brown Coat:
 
** NOTE TO SPECIFIER ** Delete mix proportion not required.
 
1)
For cementitious material, mix 1 part Portland cement and 0 to 3/4 parts lime.
2)
For cementitious material, mix 1 part Portland cement and 3/4 to 1-1/2 parts lime.
3)
Use 3 to 5 parts aggregate per part of cementitious material, but not less than volume of aggregate used in scratch coat.
2.
Masonry Cement Mixes:
a.
Scratch Coat: 1 part masonry cement and 2-1/2 to 4 parts aggregate.
b.
Brown Coat: 1 part masonry cement and 3 to 5 parts aggregate, but not less than volume of aggregate used in scratch coat.
3.
Portland and Masonry Cement Mixes:
a.
Scratch Coat: For cementitious material, mix 1 part Portland cement and 1 part masonry cement. Use 2-1/2 to 4 parts aggregate per part of cementitious material.
b.
Brown Coat: For cementitious material, mix 1 part Portland cement and 1 part masonry cement. Use 3 to 5 parts aggregate per part of cementitious material, but not less than volume of aggregate used in scratch coat.
4.
Plastic Cement Mixes:
a.
Scratch Coat: 1 part plastic cement and 2-1/2 to 4 parts aggregate.
b.
Brown Coat: 1 part plastic cement and 3 to 5 parts aggregate, but not less than volume of aggregate used in scratch coat.
5.
Portland and Plastic Cement Mixes:
a.
Scratch Coat: For cementitious material, mix 1 part plastic cement and 1 part Portland cement. Use 2-1/2 to 4 parts aggregate per part of cementitious material.
b.
Brown Coat: For cementitious material, mix 1 part plastic cement and 1 part Portland cement. Use 3 to 5 parts aggregate per part of cementitious material, but not less than volume of aggregate used in scratch coat.
 
** NOTE TO SPECIFIER ** According to ASTM C 926, mixes in subparagraphs below are suitable for use over "low-absorption" plaster bases such as brick, concrete, and dense, smooth clay tile. Delete if not required. Delete if not required.
 
C.
Base-Coat Mixes: Single base coats for two-coat plasterwork as follows:
1.
Portland Cement Mix: For cementitious material, mix 1 part Portland cement and 0 to 3/4 part lime. Use 2-1/2 to 4 parts aggregate per part of cementitious material.
2.
Portland and Masonry Cement Mix: For cementitious material, mix 1 part Portland cement and 1 part masonry cement. Use 2-1/2 to 4 parts aggregate per part of cementitious material.
3.
Plastic Cement Mix: Use 1 part plastic cement and 2-1/2 to 4 parts aggregate.
 
** NOTE TO SPECIFIER ** According to ASTM C 926, mixes in subparagraphs below are suitable for use over "high-absorption" plaster bases such as concrete masonry, absorptive brick, and tile. Delete if not required.
 
D.
Base-Coat Mixes: Single base coats for two-coat plasterwork as follows:
1.
Portland Cement Mix: For cementitious material, mix 1 part Portland cement and 3/4 to 1-1/2 parts lime. Use 2-1/2 to 4 parts aggregate per part of cementitious material.
2.
Masonry Cement Mix: Use 1 part masonry cement and 2-1/2 to 4 parts aggregate.
3.
Plastic Cement Mix: Use 1 part plastic cement and 2-1/2 to 4 parts aggregate.
 
** NOTE TO SPECIFIER ** Retain applicable finish coats in paragraphs below or insert others to suit Project. Coordinate with requirements retained in "Plaster Materials" Article and with requirements for base coats.
 
E.
Job-Mixed Finish-Coat Mixes:
 
** NOTE TO SPECIFIER ** Decreasing the proportion of lime in the mix produces a harder surface but increases the possibility of cracking.
 
1.
Portland Cement Mix: For cementitious materials, mix 1 part Portland cement and 3/4 to 1-1/2 parts lime. Use 1-1/2 to 3 parts aggregate per part of cementitious material.
2.
Portland Cement Mix: For cementitious materials, mix 1 part Portland cement and 1-1/2 to 2 parts lime. Use 1-1/2 to 3 parts aggregate per part of cementitious material.
3.
Masonry Cement Mix: 1 part masonry cement and 1-1/2 to 3 parts aggregate.
4.
Portland and Masonry Cement Mix: For cementitious materials, mix 1 part Portland cement and 1 part masonry cement. Use 1-1/2 to 3 parts aggregate per part of cementitious material.
5.
Plastic Cement Mix: 1 part plastic cement and 1-1/2 to 3 parts aggregate.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
F.
Factory-Prepared Finish-Coat Mixes: For ready-mixed finish-coat plasters and acrylic-based finish coatings, comply with manufacturer's written instructions.
PART 3 EXECUTION
 
3.1
EXAMINATION
A.
Examine areas and substrates, with Installer present, and including welded hollow-metal frames, cast-in anchors, and structural framing, for compliance with requirements and other conditions affecting performance of the Work.
B.
Proceed with installation only after unsatisfactory conditions have been corrected.
3.2
PREPARATION
A.
Protect adjacent work from soiling, spattering, moisture deterioration, and other harmful effects caused by plastering.
B.
Prepare solid substrates for plaster that are smooth or that do not have the suction capability required to bond with plaster according to ASTM C 926.
3.3
INSTALLATION, GENERAL
A.
Fire-Resistance-Rated Assemblies: Install components according to requirements for design designations from listing organization and publication indicated on Drawings.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
B.
Sound Attenuation Blankets: Where required, install blankets before installing lath unless blankets are readily installed after lath has been installed on one side.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
C.
Acoustical Sealant: Where required, seal joints between edges of plasterwork and abutting construction with acoustical sealant.
3.4
INSTALLING METAL LATH
A.
Expanded-Metal Lath: Install according to ASTM C 1063.
 
** NOTE TO SPECIFIER ** Retain appropriate lath for each location specified in four categories below;
 
1.
Partition Framing and Vertical Furring: Install flat diamond-mesh lath.
2.
Partition Framing and Vertical Furring: Install flat rib lath.
3.
Partition Framing and Vertical Furring: Install welded-wire lath.
4.
Partition Framing and Vertical Furring: Install woven-wire lath.
5.
Flat-Ceiling and Horizontal Framing: Install flat diamond-mesh lath.
6.
Flat-Ceiling and Horizontal Framing: Install flat rib lath.
7.
Flat-Ceiling and Horizontal Framing: Install 3/8-inch (9.5-mm) rib lath.
8.
Flat-Ceiling and Horizontal Framing: Install welded-wire lath.
9.
Flat-Ceiling and Horizontal Framing: Install woven-wire lath.
 
** NOTE TO SPECIFIER ** Diamond-mesh lath requires closely spaced supports when used on ceilings.
 
10.
Curved-Ceiling Framing: Install flat diamond-mesh lath.
11.
Curved-Ceiling Framing: Install welded-wire lath.
12.
Curved-Ceiling Framing: Install flat woven-wire lath.
13.
On Solid Surfaces, Not Otherwise Furred: Install self-furring, diamond-mesh lath.
14.
On Solid Surfaces, Not Otherwise Furred: Install self-furring, welded-wire lath.
15.
On Solid Surfaces, Not Otherwise Furred: Install self-furring, woven-wire lath.
3.5
INSTALLING WELDED WIRE LATH
A.
Installation per ESR 2017 - Fastener type and spacing as per ASTM C 1063 except that fasteners may attach the lath to framing supports either at the furring crimps on the vertical cross wire, at the intersection of the longitudinal wire and cross wire or any point along the longitudinal wires.
1.
Product: Structa Wire Corp. Structalath by ClarkDietrich Building Systems.
3.6
INSTALLING ACCESSORIES
A.
Install according to ASTM C 1063 and at locations indicated on Drawings.
B.
Reinforcement for External Corners:
1.
Install lath-type, external-corner reinforcement at exterior locations.
 
** NOTE TO SPECIFIER ** If retaining subparagraph above, delete option in subparagraph below.
 
2.
Install corner bead at interior corner locations.
3.
Install corner bead at exterior corner locations.
C.
Control Joints:
 
** NOTE TO SPECIFIER ** Usually retain first option in paragraph below and show joints on Drawings.
 
1.
Install control joints at locations indicated on Drawings.
2.
Install control joints in specific locations approved by Architect for visual effect as follows:
a.
______.
 
** NOTE TO SPECIFIER ** Retain subparagraphs below if retaining last option in paragraph above.
 
3.
As required to delineate plasterwork into areas (panels) of the following maximum sizes:
a.
Vertical Surfaces: 144 sq. ft. (13.4 sq. m).
b.
Horizontal and other Nonvertical Surfaces: 100 sq. ft. (9.3 sq. m).
4.
At distances between control joints of not greater than 18 feet (5.5 m) o.c.
5.
As required to delineate plasterwork into areas (panels) with length-to-width ratios of not greater than 2-1/2:1.
6.
Where control joints occur in surface of construction directly behind plaster.
7.
Where plasterwork areas change dimensions, to delineate rectangular-shaped areas (panels) and to relieve the stress that occurs at the corner formed by the dimension change.
3.7
PLASTER APPLICATION
A.
General: Comply with ASTM C 926.
1.
Do not deviate more than plus or minus 1/4 inch in 10 feet (6.4 mm in 3 m) from a true plane in finished plaster surfaces, as measured by a 10-foot (3-m) straightedge placed on surface.
2.
Finish plaster flush with metal frames and other built-in metal items or accessories that act as a plaster ground unless otherwise indicated. Where casing bead does not terminate plaster at metal frame cut base coat free from metal frame before plaster sets and groove finish coat at junctures with metal.
 
** NOTE TO SPECIFIER ** Retain subparagraph below if plaster surfaces will receive field-applied finishes.
 
3.
Provide plaster surfaces that are ready to receive field-applied finishes indicated.
B.
Bonding Compound: Apply on unit masonry and concrete plaster bases.
 
** NOTE TO SPECIFIER ** Delete mix type not required.
 
C.
Walls; Base-Coat Mixes for Use over Metal Lath: Scratch and brown coats for three-coat plasterwork; 3/4-inch (19-mm) thickness.
1.
Portland cement mixes.
2.
Masonry cement mixes.
3.
Portland and masonry cement mixes.
4.
Plastic cement mixes.
5.
Portland and plastic cement mixes.
 
** NOTE TO SPECIFIER ** Delete mix type not required.
 
D.
Ceilings; Base-Coat Mixes for Use over Metal Lath: Scratch and brown coats for three-coat plasterwork; 1/2 inch (13 mm) thick and 3/4 inch (19 mm) thick on concrete.
1.
Portland cement mixes.
2.
Masonry cement mixes.
3.
Portland and masonry cement mixes.
4.
Plastic cement mixes.
5.
Portland and plastic cement mixes.
 
** NOTE TO SPECIFIER ** Delete mix type not required.
 
E.
Walls; Base-Coat Mix: Scratch coat for two-coat plasterwork, 3/8 inch (10 mm) thick on concrete masonry and 1/4 inch (6 mm) thick on concrete.
1.
Portland cement mixes.
2.
Masonry cement mixes.
3.
Portland and masonry cement mixes.
4.
Plastic cement mixes.
5.
Portland and plastic cement mixes.
 
** NOTE TO SPECIFIER ** Delete mix type not required.
 
F.
Ceilings; Base-Coat Mix: Scratch coat for two-coat plasterwork, 1/4 inch (6 mm) thick on concrete.
1.
Portland cement mixes.
2.
Masonry cement mixes.
3.
Portland and masonry cement mixes.
4.
Plastic cement mixes.
5.
Portland and plastic cement mixes.
 
** NOTE TO SPECIFIER ** If various finishes are required, indicate locations of each on Drawings or by inserts in first paragraph below. Delete finish not required.
 
G.
Plaster Finish Coats:
1.
Apply to provide float finish to match Architect's sample.
2.
Apply to provide dash finish to match Architect's sample.
3.
Apply to provide scraped trowel-textured finish to match Architect's sample.
4.
Apply to provide skip trowel-textured finish to match Architect's sample.
5.
Apply to provide brocade (knock-down dash) finish to match Architect's sample.
6.
Apply to provide trowel sweep finish to match Architect's sample.
7.
Apply to provide combed finish to match Architect's sample.
8.
Apply to provide sacked (California mission) finish to match Architect's sample.
9.
Apply to provide English finish to match Architect's sample.
10.
Apply to provide marblecrete finish to match Architect's sample.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
H.
Acrylic-Based Finish Coatings: Apply coating system, including primers, finish coats, and sealing topcoats, according to manufacturer's written instructions.
 
** NOTE TO SPECIFIER ** Where finishes will be adhered to plaster, verify that plasterwork specified complies with requirements for setting materials.
 
I.
Concealed Exterior Plasterwork: Where plaster application will be used as a base for adhered finishes, omit finish coat.
J.
Concealed Interior Plasterwork:
1.
Where plaster application will be concealed behind built-in cabinets, similar furnishings, and equipment, apply finish coat.
2.
Where plaster application will be concealed above suspended ceilings and in similar locations, finish coat may be omitted.
 
** NOTE TO SPECIFIER ** Where tile will be adhered to plaster, verify that plasterwork specified complies with requirements for tile-setting materials.
 
3.
Where plaster application will be used as a base for adhesive application of tile and similar finishes, omit finish coat.
3.8
PLASTER REPAIRS
A.
Repair or replace work to eliminate cracks, dents, blisters, buckles, crazing and check cracking, dry outs, efflorescence, sweat outs, and similar defects and where bond to substrate has failed.
3.9
PROTECTION
A.
Remove temporary protection and enclosure of other work. Promptly remove plaster from door frames, windows, and other surfaces not indicated to be plastered. Repair floors, walls, and other surfaces stained, marred, or otherwise damaged during plastering.
END OF SECTION