S02_09 40 00 Precast Terrazzo Stair Tread and Risers JG.docx
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- Solicitation number
- 36C24122B0009
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This document provides specifications for precast terrazzo stair treads and risers for the renovation of Building 6 HVAC and roof at a Veterans Affairs medical center. The specifications cover product requirements for terrazzo composition and finishes, as well as installation details. Precast terrazzo manufacturers must have five years of experience with projects of similar scope. The solicitation references IFB 36C24122B0009 issued by the Department of Veterans Affairs Veterans Health Administration VISN 1 for the renovation project. Products required include precast terrazzo stairs, landings, setting materials, grouts, and sealants. Installation will include modifying existing substrates and preparation of surfaces to receive new terrazzo.
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| Renovate Building 6 HVAC and Roof | 100% Construction Documents |
| 631-16-020 | 11-18-2021 |
SECTION 09 40 00
PRECAST TERRAZZO STAIR TREADS AND RISERS
PART 1 - GENERAL
| 1.1 | SUMMARY |
| A. | Types of Precast Terrazzo work included: |
| 1. | Precast Terrazzo Stairs – tread/riser |
| 2. | Precast Terrazzo Landings. |
| B. | Setting material, grouts, sealants and caulks |
| C. | Installation of precast terrazzo stair tread/risers. |
| 1. | Modification to existing tread and/or riser substrate to accommodate installation including but not limited to infilling voids with cementitious products to provide solid surface for bonding tread/riser in place. |
| 2. | Installation may include glass fiber reinforced backer board on risers and preparation of treads to receive new precast tread/riser. |
| D. | Removal of existing slate stair treads. |
| 1.2 | REFERENCES |
| A. | American Society for Testing and Materials (ASTM) |
| 1. | ASTM C-150 |
| 2. | ASTM C-33 |
| 3. | ASTM C-140 |
| 4. | ASTM C-293 |
| 5. | ASTM C-1028 |
| B. | National Terrazzo and Mosaic Association Inc. (NTMA) |
| C. | Federal Register Part III |
| 1. | 28 CFR Part 36 |
| 1.3 | SUBMITTALS |
| A. | Shop Drawings |
1. Submit shop drawings of all precast terrazzo items showing detail sections and profile for all precast items. Details shall show all reinforcing and special hardware for fastening.
2. Contractor shall provide templates of all conditions to the manufacturer to assure the best fit of precast items.
| B. | Samples: |
| 1. | Submit maximum of 3 samples 6" x 6" size for all color. |
| a. | Color to be selected from manufacturer’s color pallet. |
| 2. | Submit two copies of NTMA maintenance literature. |
| 3. | Quality Assurance and Procedure Program |
| C. | Performance Requirements: |
| 1. | Compressive Strength 4000 p.s.i. |
| 2. | Flexural Strength 600 p.s.i. |
| D. | Certification: |
| 1. | Suppliers shall furnish certification attesting that materials meet specification requirements. |
| 1.4 | QUALITY ASSURANCE |
| A. | NTMA Standards: Comply with specified provisions and recommendations of the National Terrazzo & Mosaic Association, Inc. (NTMA). |
| B. | Manufacturer's Instructions: In addition to specified requirements, comply with precast terrazzo manufacturer's instructions and recommendations for substrate preparation, materials storage, mixing and application, finishing and curing. |
| C. | Qualifications: Precast Terrazzo Manufacturer and Trade Contractor must have a minimum of 5 years of successful experience on projects of similar magnitude and complexity to that indicated project. |
| D. | Manufacturer and installer to be prequalified by Architect prior to bidding. Failure to prequalify may void bid. |
| E. | Manufacturer to supply a written Quality Assurance Program and Procedure manual. |
| 1.5 | DELIVERY, STORAGE AND HANDLING |
| A. | Packaging and Shipping: Precast terrazzo to be palletized and shrink wrapped, delivered in original unopened packaging with legible manufacturer identification, including size, piece number, quantities, manufacturer date and inspector initials. |
| B. | Storage and Protection: Precast terrazzo to be stored indoors, in a climate controlled environment, sheltered from moisture in original packaging. Protect from damage by other trades. |
| C. | Report all damage due to shipment immediately. Customer is required to sign the Bill of Lading slip noting damaged product. Picture proof is required. |
| 1.6 | WARRANTY |
Construction Warranty: Comply with FAR clause 52.246-21, "Warranty of Construction".
Manufacturer/Installer shall warrant installed system for a period of 1 year from date of substantial completion against failure of workmanship and materials.
PART 2 - PRODUCTS
| 2.1 | MANUFACTURERS |
| A. | Basis of Design: |
| 1. | Wausau Tile, Inc. Tectura Designs Cementitious Tread Risers. |
| 2.2 | MATERIALS |
| A. | Portland Cement: ASTM C-150 Specifications for Portland Cement. |
| B. | Aggregates: All aggregates to meet ASTM C-33 specifications, cleaned and properly graded to size. Aggregate shall be blended to meet individual project requirements. |
| C. | Marble chips, size to conform with NTMA gradation standards. |
| D. | Coloring; Pigments used shall be inorganic, resistant to alkalinity and used per manufacturer's recommendations. |
| E. | Reinforcement and Hardware: |
| 1. | To conform with NTMA and Manufacturer's design. |
| 2. | Reinforce precast with deformed rods or wire mesh or both as recommended by precast terrazzo manufacturer. |
| F. | Abrasive Inserts: Shall consist of silica sand and black epoxy. |
| 1. | Provide three lines of abrasive strips. |
| G. | Caulks & Sealants: |
| 1. | Urethane or Polyurethane Sealant |
| 2. | Color to be selected by Architect to match the color of the terrazzo treads. |
| H. | Cleaner: Liquid neutral chemical cleaner, with pH factor between 7 and 8, of formulation recommended by sealer manufacture for type of precast terrazzo used and complying with NTMA requirements. |
| I. | Sealer: Colorless, slip and stain-resistant penetrating sealer with pH factor between 7 and 8 that does not affect color or physical properties of precast terrazzo surface. Flash point (ASTM D56): 80 degrees F, Minimum. |
| 2.3 | MANUFACTURED UNITS |
| A. | Sizing Tolerances: |
| 1. | All units to conform to shop drawings with a 1/16" tolerance in dimension. |
| B. | Precast Surfaces and Edges: |
| 1. | All exposed edges to be ground and polished with a minimum of 1/16" bevel. |
| 2. | All finished surfaces to be ground and polished, free of holes and to have overall uniformity in matrix and aggregate. |
| 3. | All precast terrazzo finished surfaces to be sealed with a sealer approved by manufacturer. |
PART 3 - EXECUTION
| 3.1 | INSPECTION |
| A. | Examine areas to receive precast terrazzo for the following: |
| 1. | Defects in existing work. |
| 2. | Deviations beyond allowable tolerances for the substrate. |
| B. | Start work only when all defects have been corrected by others. |
| 3.2 | INSTALLATION |
| A. | Setting: |
1. Setting methods will vary per product. Set accurately as shown on the approved shop drawings. Contact your setting material manufacturer with any questions on proper bonding of all materials.
2. Setting methods are:
a. Cement based setting materials: Contact your selected manufacturer as recommended or specified. Setting materials can change without notice.
b. Epoxy based setting materials: Contact your selected manufacturer as recommended or specified. Setting materials can change without notice.
| B. | All thinset materials, whether cement or epoxy based, will require a full setting bed be applied to all appropriate surfaces of the precast terrazzo, vertical and horizontal, where contact is made with the substrate or structural base. |
| C. | Alignment of precast should be straight and true to all dimensions. It may not vary more than 1/8" in length, height or width. |
| D. | Install anchors as shown on details, if required. |
| E. | Fill joints between with manufacturer -approved caulk or as specified. |
| 3.3 | PROTECTION |
| A. | Upon completion, the work shall be ready for final inspection and acceptance by owner or owner agent. |
| B. | General Contractor shall protect the finished work from the time the terrazzo contractor completes the work. |
| 3.4 | FINISH |
| A. | All precast epoxy terrazzo finished surfaces to be sealed with a sealer approved by manufacturer. |
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