MANUFACTURER'S SPECIFICATIONS
SECTION 09225 THREE COAT LIME PLASTER (LDS) -
Smooth Finish
PART I GENERAL
1.1 Summary
A. This Section includes the three coat lime plaster system.
B. Related Sections
1. Section 05400-Cold Formed Metal Framing
2. Section 06112-Framing and Sheathing: Wood Studs
3. Section 09111-Non-Load-Bearing Metal Frame System
4. Section 09205-Furring and Lathing: Metal furring and lathing for plaster base
5. Section 09260-Gypsum Board Assemblies
1.2 References
A. American Society for Testing and Materials
1. ASTM C91-Standard Specification for Masonry Cement.
2. ASTM C141-Standard Specification for Hydraulic Lime for Standard Purposes.
3. ASTM C150-Standard Specification for Portland Cement.
4. ASTM C206-Standard Specification for Finishing Hydrated Lime.
5. ASTM C847-Standard Specification for Hydrated Lime for Masonry Purposes.
6. ASTM C897-Standard Specification for Metal Lath.
7. ASTM C932-Standard Specification for Surface Applied Bonding Agents for Exterior Plastering.
8. ASTM C933-Standard Specification for Welded Wire Lath.
9. ASTM C979-Standard Specification for Pigments for Integrally Colored Concrete.
10. ASTM C1002-Standard Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases.
11. ASTM C1032-Standard Specification for Woven Wire Plaster Base.
12. ASTM C1063-Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster.
13. ASTM C1116-Standard Specification for Fiber-Reinforced Concrete or Shotcrete.
B. Federal Specification Unit
1. FS UU-B-790-Building Paper, Vegetable Fiber: Kraft, Waterproofed, Water Repellent and Fire Resistant.
C. Portland Cement Association
1. PCA-Portland Cement Plaster (Stucco) Manual.
1.3 Performance Requirements
A. Structure to be designed in such a way as to minimize the transfer of stress from building to plaster skin.
B. Fabricate vertical elements to limit surface to L / 480 deflection under load of 100 lbs.
C. Fabricate horizontal elements to limit finish surface to L / 360 deflection under superimposed dead load and wind uplift loads.
1.4 Submittals
A. Section 01330-Submittal Procedures: Submittal Procedures.
B. Product Data: Submit data on plaster materials, characteristics and limitations of products specified.
C. Samples: Submit two samples, 12 inch by 12 inch in size, illustrating finish color and texture.
1.5 Quality Assurance
A. Perform Work in accordance with Manufacturer's Instructions.
1.6 Qualifications
A. Manufacturer: All Le Décor LimePlaster products shall be obtained from:
TransMineral USA, Inc.
201 Purrington Road
Petaluma, CA 94952
707-769-0661
707-769-0352 Fax
www.transmineralusa.com
or its authorized distributors.
B. Installer: Company specializing in performing
Work of this section with a minimum of three (3) years experience.
1.7 Mock-up
A. Section 01400-Quality Requirements: Requirements for mock-up.
B. Construct mock-up, ___ feet long by ____ inch wide, including exterior and interior wall and ceiling system illustrating surface finish and color.
C. Locate where directed by Architect.
D. [Incorporate accepted mock-up as part of Work.]
E. [Remove mock up when directed by Architect.]
1.8 Environmental Requirements
A. Provide environmental conditions at areas where Work of this SECTION is being performed to allow limestone plaster to properly cure.
B. Take precautionary measures necessary to assure that excessive temperature changes do not occur.
C. Do not apply limestone plaster unless minimum ambient temperature of 45 degrees F and a maximum of 85 degrees F has been and continues to be maintained for a minimum of 48 hours prior to application and until plaster is cured.
D. Hot Weather Requirements: Protect limeplaster
from uneven and excessive evaporation during dry, hot weather.
Provide tarping over the outside of all scaffolding.
PART 2 PRODUCTS
2.1 Lime Plaster
A. Manufacturer
1. TransMineral USA, Inc.
2.2 Components
A. Plaster Base Materials
1. Cement: ASTM C150 Type I Portland Cement, STM C9, Type M or S or N masonry cement, ASTM C1328, type M or S plastic cement.
2. Lime: ASTM C206, Type S or ASTM C207 Type S.
3. Aggregate: In accordance with ASTM C897.
4. Water: Clean, fresh, potable and free of mineral or organic matter capable of affecting plaster.
5. Bonding Agent: ASTM C932; type recommended for bonding plaster to concrete and concrete masonry surfaces.
6. Fibers: 1/2 inch nominal length glass fibers
meeting requirements of ASTM C1116.
B. Plaster Finish Materials
1. Binder: Le Décor LimePlaster -LDS 75.
2. Aggregate: Le Décor Mineral Charge-LD 1.
3. Color Pigment: ASTM C979 mineral oxide by Bayer, Merlex, La Habra or equal.
4. Water: Clean, fresh, potable and free of mineral or organic matter capable of affecting plaster.
C. Furring and Lathing
1. Metal lath and accessories as specified in Section 09205.
2.3 Mixes
A. Base Coats: Mix and proportion cement plaster
base coat in accordance with PCA Portland Cement Plaster (Stucco)
Manual as indicated on Drawings.
1. Fiber Reinforcement: Add glass fibers to scratch coat at a rate of one (1) pound per sack of cement.
B. Finish Coat: Mix and proportion lime plaster
finish coat in accordance with manufacturer instructions.
Mixing Ratio:
-(1) bag Binder-(LDS 75)
-(3) bags Mineral Charge - (LD 1)
-Clean potable water, amount as required for either hand or machine application.
C. Mix only as much plaster as can be
used prior to initial set.
D. Add color pigments to finish coat.
E. Mix materials dry, to uniform color and consistency,
before adding water.
F. Protect mixtures from freezing, frost, contamination,
and excessive evaporation.
G. Do not retemper mixes after initial set has
occurred.
PART 3 EXECUTION
3.1 Examination
A. Section 01300-Administrative Requirements: Coordination and project conditions.
B. Masonry: Verify joints are cut flush and surface is ready to receive work of this section. Verify no bituminous or water repellent coatings exist on masonry surface.
C. Concrete: Verify surfaces are flat, honeycomb are filled flush, and surfaces are ready to receive work of this section. Verify no bituminous, water repellent, or form release agents exist on concrete surface that are detrimental to plaster bond. Use of bonding agent over block or concrete may be necessary.
D. Metal Lath and Accessories: Verify lath is flat, secured to substrate, and joint and surface perimeter accessories are in place.
E. Mechanical and Electrical: Verify surfaces within walls have been tested and approved.
3.2 Preparation
A. Dampen masonry surfaces to reduce excessive suction.
B. Clean concrete surfaces of foreign matter. Clean surfaces using acid solutions, solvents, or detergents. Wash surfaces with clean water.
C. Roughen smooth concrete surfaces and apply bonding agent or dash-bond coat.
3.3 Installation
A. Installation of Lathing Materials:
1. Apply two layers of Grade D building paper over plywood substrate, and one layer over gypsum sheathing, lap edges 2 inches minimum.
2. Install metal lath in accordance with ASTM C1063.
B. Installation of Accessories:
1. Install accessories in accordance with ASTM C1063.
2. Place corner bead at external wall corners; fasten outer edges of lath only. (Specification 09205-Metal Lath)
3. Place strip mesh diagonally at corners of lathed openings. Secure rigidly in place. (Specification 09205 Metal Lath)
4. Place casing beads at terminations of plaster finish. Butt and align ends. Secure rigidly in place. (Specification 09205 Metal Lath)
5. Install door and glazed frames plumb and level in opening, after limeplaster is complete.
C. Control and Expansion Joints:
1. Install interior control and expansion joints every twenty (20) feet or as indicated on Drawings.
2. Routed Control Joints: Rout exterior control joints after initial set, scribed as indicated on Drawings by cutting through 2/3 of limeplaster depth, neatly, in straight lines.
3. Metal Control Joints: Install in accordance with Specification Section 09205-Metal Lath.
4. For horizontal exterior surfaces, install control and expansion joints, not to exceed 100-sq. ft. or as indicated on Drawings.
5. For vertical exterior surfaces, install control and expansion joints, not to exceed 144-sq. ft. or as indicated on Drawings.
D. Plastering:
1. Apply plaster in accordance with PCA Plaster Manual.
2. Apply base coat to nominal thickness of 1/4
inch, brown coat to nominal thickness of 3/8 inch and finish coat
to nominal thickness of 1/4 (smooth finish).
3. Moisture cure brown coats. Brown shall be finished with an open texture, allowing for mechanical bond of finish coat.
4. After curing, dampen previous coat prior to applying finish coat.
5. Apply finish coat to indicated color and texture in accordance with manufacturer's instructions.
6. Avoid excessive working of the surface. Delay troweling as long as possible to avoid drawing excess fines to surface.
7. Moist cure finish coat for minimum period of 72 hours.
3.4 Erection Tolerances
A. Section 01400-Quality Requirements: Tolerances.
B. Maximum Variation from Flat Surface: 1/4 inch in 10 feet.
3.5 Adjusting
A. Section 01700-Execution Requirements: Testing, adjusting, and balancing.
B. Remove damaged or defective plaster by cutting and replace with specified materials to match adjacent plaster.
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