Attachment_3_-_BSD-Cement_Plastering.pdf
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- Attached to
- Repaint & Repair Stucco Federal contract opportunity
- Solicitation number
- 140P6426Q0106
About this file
Section 09 24 00 – Cement Plastering
This is a specification section for cement plastering work in federal construction projects. The specification requires contractors to apply three-coat cement plaster systems over metal lath substrates, with factory-prepared plaster mixes applied to specified thicknesses: a 3/8-inch first coat, a 1/32 to 1/16-inch leveling coat, and a 1/8-inch finish coat with an evenly sanded surface using medium grain sand. Jobsite-mixed plaster must comply with ASTM C150/C150M Type I Portland cement, clean well-graded sand per ASTM C897, and potable water free of contaminants. All applications must follow ASTM C926 and manufacturer instructions, with base coats fully embedding metal lath and leveling coats fully embedding 4.5 oz/sq yd alkali-resistant reinforcing mesh. Contraction joints must be scribed every specified distance in each direction, cutting through two-thirds of plaster depth.
Quality assurance requires installers to be companies with minimum three years documented experience in plastering work. Submittals include product data on plaster materials and trim accessories, plus two 18" by 18" samples demonstrating finish color and texture. A mock-up panel measuring 4 feet wide by 4 feet high must be constructed at the jobsite showing each installation phase including framing and reinforcement. Exterior plaster application is prohibited when substrate or ambient air temperature is 40°F (4°C) or lower, or when temperatures are expected to drop below 40°F within 48 hours of application. Maximum variation from true flatness tolerance is 1/8 inch in 10 feet (3 mm in 3 m).
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| Questions_and_Answers_0001.pdf | ||
| Sol_140P6426Q0106_Amd_0001.pdf | ||
| Statement_of_Work_-_Revised_0001.pdf | ||
| Construction_Prevailing_Wage_Determination.pdf | ||
| Attachment_4_-_Historic_Structures_Report.pdf | ||
| Attachment_1_-_Stucco_Restoration.pdf | ||
| Price_Schedule.xlsx | XLSX spreadsheet | |
| Statement_of_Work.pdf | ||
| Price_Schedule.pdf | ||
| Submittal_List.pdf | ||
| Sol_140P6426Q0106.pdf | ||
| Attachment_2_-_BSD-Painting_and_Coating.pdf |
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Text version
SCBL PMIS #152851 09 24 00 - 1
CEMENT PLASTERING
SECTION 09 24 00 - CEMENT PLASTERING
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Cement plastering.
1.2 RELATED REQUIREMENTS
A. Section 09 90 00 - Painting and Coating
1.3 REFERENCE STANDARDS
A. ASTM C150/C150M - Standard Specification for Portland Cement; 2016.
B. ASTM C897 - Standard Specification for Aggregate for Job-Mixed Portland Cement-Based
Plasters; 2015.
C. ASTM C926 - Standard Specification for Application of Portland Cement-Based Plaster;
2016b.
D. ASTM C932 - Standard Specification for Surface-Applied Bonding Compounds for Exterior
Plastering; 2006 (Reapproved 2013).
1.4 SUBMITTALS
A. Product Data: Provide data on plaster materials and trim accessories.
B. Samples:
1. Submit two samples, 18" by 18" inch in size illustrating finish color and texture.
1.5 QUALITY ASSURANCE
A. Installer Qualifications: Company specializing in performing the work of this section with minimum three years documented experience.
1.6 MOCK-UP
A. Mock-Up Panel: Construct a 4 foot wide by 4 foot high sample panel of plaster work at the jobsite demonstrating installation procedures, finish texture, and color. Show each phase of installation including framing and reinforcement.
1.7 FIELD CONDITIONS
A. Exterior Plaster Work: Do not apply plaster when substrate or ambient air temperature is 40 degrees F (4 degrees C) or lower, or when temperature is expected to drop below 40 degrees F (4 degrees C) within 48 hours of application.
SCBL PMIS #152851 09 24 00 - 2
PART 2 PRODUCTS
2.1 CEMENT PLASTER APPLICATIONS
A. Metal Plaster Base: Metal lath.
1. Plaster Type: Factory prepared plaster mix.
2. Number of Coats: Three.
3. First Coat: Apply to a nominal thickness of 3/8 inch (9 mm).
4. Leveling Coat: Apply to a nominal thickness of 1/32 to 1/16 inch (0.79 to 1.6 mm).
5. Finish Coat: Apply to a nominal thickness of 1/8 inch (3 mm).
a. Texture: Evenly sanded surface with medium grain sand.
2.2 JOBSITE MIXED CEMENT PLASTER
A. Materials:
1. Portland Cement: ASTM C150/C150M, Type I.
2. Sand: Clean, well graded, and complying with ASTM C897.
3. Water: Clean, fresh, potable, and free of mineral or organic matter that could adversely affect plaster.
2.3 ACCESSORIES
A. Beads, Screeds, and Joint Accessories: Per manufacturer.
B. Bonding Compound: Provide type recommended for bonding plaster to solid surfaces , complying with ASTM C932.
C. Reinforcing Mesh: 4.5 oz/sq yd (153 g/sq m) alkali-resistant mesh.
D. Cementitious Tile Backer Board: As specified in Section 09 21 16.
PART 3 EXECUTION
3.1 EXAMINATION
A. Verify existing conditions are acceptable prior to starting this work.
B. Verify metal lath is flat, secured to substrate, and joint and surface perimeter accessories are properly in place.
C. Verify mechanical and electrical equipment and services located within areas to receive this work have been properly tested and approved.
3.2 MIXING
A. Mix only as much plaster as can be used prior to initial set.
B. Mix materials dry, to uniform color and consistency, before adding water.
C. Protect mixtures from frost or freezing temperatures, contamination, and excessive evaporation.
https://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C150/C150M https://global.ihs.com/doc_detail.cfm?rid=BSD&document_name=ASTM%20C897
SCBL PMIS #152851 09 24 00 - 3
3.3 APPLICATION
A. Apply plaster in accordance with manufacturer's written instructions and comply with ASTM C926.
B. Base Coats:
1. Apply base coat(s) to fully embed lath and to specified thickness.
2. Follow guidelines in ASTM C926 and manufacturer's written installation instructions for moist curing base coats and application of subsequent coats.
C. Leveling Coat:
1. Apply leveling coat to specified thickness.
2. Fully embed reinforcing mesh in leveling coat.
D. Finish Coats:
1. Cement Plaster:
a. Apply with sufficient material and pressure to ensure complete coverage of base to specified thickness.
b. Apply desired surface texture while mix is still workable.
E. Install exterior contraction joints after initial set, scribed every per drawings feet in each direction by cutting through two-thirds of cement plaster depth, neatly, and in straight lines.
3.4 TOLERANCES
A. Maximum Variation from True Flatness: 1/8 inch in 10 feet (3 mm in 3 m).
END OF SECTION 09 24 00
SCBL PMIS #152851 09 24 00 - 4
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