Sills, Lintels & Trim

DIVISION 04 — CONCRETE SECTION 04 72 00 — ARCHITECTURAL CAST STONE: SILLS, LINTELS & TRIM PART 1 — GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. This Section includes: 1. Window sills, stooling, and sub-sills 2. Lintels and beam ends 3. Door and window surrounds, casings, and trim 4. Custom profile trim and decorative elements B. Related Sections: 1. Section 04 20 00 — Unit Masonry (mortar and anchors) 2. Section 07 92 00 — Joint Sealants (weeps and sealants) 1.3 REFERENCES A. ASTM C1364 — Standard Specification for Architectural Cast Stone B. ASTM C1194 — Standard Specification for Precast Concrete C. ASTM C1195 — Standard Specification for Architectural Precast Concrete D. ACI 318 — Building Code Requirements for Structural Concrete E. CSI MasterFormat 04 72 00 — Architectural Cast Stone 1.4 SUBMITTALS A. Product Data: Manufacturer's literature describing products, material properties, and finish options. B. Shop Drawings: Elevation views, section profiles, joint details, and anchorage methods for each profile. C. Samples: Submit minimum 6" long samples of each finish color and profile specified. D. Test Reports: Provide certificates of compliance with ASTM standards and independent laboratory test results. E. Quality Assurance: Provide documentation of fabricator's experience and plant certification. 1.5 QUALITY ASSURANCE A. Fabricator: Minimum 10 years' experience in architectural cast stone manufacturing. Plant certified by regional building authority or third-party inspection agency. B. Testing: Independent laboratory testing per ASTM C1364 for compressive strength (6,500 psi minimum) and absorption (6% maximum). C. Mock-ups: Before production, construct full-size mock-up of each unique profile for architect approval. 1.6 DELIVERY, STORAGE & HANDLING A. Shipping: Crate units on padded racks. Identify each piece with shop drawing number and location code. B. Storage: Store off ground on padded supports. Protect from damage, soiling, and moisture. C. Handling: Lift units at designed pick-up points. Do not drop, drag, or impact cast stone units. PART 2 — PRODUCTS 2.1 MANUFACTURERS A. Acceptable Manufacturer: Mesa Precast, Mesa, AZ — Contact: Jess Mason, 480-600-6776 1. Additional manufacturing locations: Texas, Pennsylvania 2. Representative: contact via archstoneglobal.polsia.app B. Substitutions: Equal products by other certified manufacturers may be submitted 10 days prior to bid. 2.2 MATERIALS A. Cast Stone: ASTM C1364, non-air-entrained, dry-cast vibration process. 1. Compressive Strength: 6,500 psi minimum at 28 days (3 specimens average) 2. Absorption: 6% maximum by weight 3. Freeze-Thaw: 300 cycles minimum, no visible deterioration B. Coloring: Inorganic iron oxide pigments, UV-stable, minimum 5% by weight of cement content. C. Reinforcement: Unless otherwise indicated, non-stressed reinforcement only. Galvanized steel or FRP bars where indicated. 2.3 PROFILES & CONFIGURATIONS A. Window Sills: Drip-notched profile with wash slope (min 1:12). Standard lengths up to 12 ft. Custom lengths available. B. Lintels: Coordinate profile with specified cornice and trim. Pre-drilled anchor slots at 24" o.c. maximum. C. Door/Window Surrounds: Profile per approved shop drawings. Return visible edges on all exposed faces. D. Tolerances: ±1/8" on dimensions, ±1/16" on details, ±1 degree on angles. 2.4 FINISHES A. Standard Finishes: 1. Portland (ASTM C1364 Color 1): Warm neutral gray 2. Bucks County (ASTM C1364 Color 2): Buff/tan 3. Old World (ASTM C1364 Color 3): Antique cream 4. Carbon (ASTM C1364 Color 4): Charcoal gray B. Surface Finish: Ground and honing to match specified standard. No exposed aggregate, rock pockets, or cold joints visible at 10 ft. C. Custom Colors: Match architect's physical sample or color reference. Minimum 4-week lead for custom color development. 2.5 ANCHORAGE & ACCESSORIES A. Anchors: Hot-dip galvanized steel, minimum 3/8" diameter threaded rods or strap anchors. Ceramic wool gasket at differential movement joints. B. Setting Shims: Plastic or stainless steel shims. Do not use wood or ferrous metal shims. C. Weepholes: 3/8" diameter, at 24" o.c. maximum at base of sill courses. PART 3 — EXECUTION 3.1 EXAMINATION A. Inspect prepared substrate for dimensional compliance and anchorage readiness before setting cast stone. B. Do not begin installation until unsatisfactory conditions are corrected. 3.2 INSTALLATION A. Setting: Set cast stone units in fresh mortar bed (Type N or S, per specifier). Maintain level and aligned throughout. B. Anchorage: Install all specified anchors and dowels. Do not bridge joints with anchors. C. Joints: 3/8" nominal joint width. Strike flush or slightly recessed. Do not pack joints. D. Cutting: Cut cast stone with wet saw. Do not use hammer-and chisel for structural cuts. 3.3 TOLERANCES A. Alignment: ±1/8" from building layout lines. ±1/16" from level or plumb. B. Joints: ±1/16" from specified joint width. C. Surface: No visible steps or offsets exceeding 1/32" between adjacent units. 3.4 CLEANING & PROTECTION A. Protection: Cover completed work with heavy paper or plywood during construction. B. Cleaning: Clean exposed surfaces with plain water or mild detergent. Do not use acidic cleaners on limestone-colored units. C. Sealant: After mortar cure, apply backer rod and sealant at all perimeter joints. END OF SECTION 04 72 00