1.01 SUMMARY

Section Includes: Echeguren slate flooring and flagstone paving installations with accessories, as required for complete installation. Coordinate installation with waterproofing membrane at setting beds.

Related Sections: Division 7: Waterproofing membrane at slate setting beds.

1.02 REFERENCES

ANSI A 108.1: Installation of Tile with Portland Cement Mortar.

ANSI A 108.5: Installation of Tile with Latex-Portland Cement Mortar.

ANSI A 108.10: Installation of Grout in Tilework.

Tile Council of America (TCA): Handbook for Ceramic Tile Installation.

1.03 SUBMITTALS

Product Data: Furnish manufacturer's literature for each manufactured material.

Shop Drawings: Provide pattern drawings indicating field and edge conditions for each area of stone flooring. Indicate locations and widths of expansion, contraction, control, and isolation joints in slate flooring substrates and finished surfaces.

Samples: Furnish samples of each type, color, grade, and finish of slate and each color of grout required for Project.

Color Charts: Show full range of colors, textures and patterns available for each type of slate.

Full Size Samples: Prepare sample panels consisting of not less than four slate units with grout mounted on plywood, clearly indicating pattern, coloration, and joints.

Certification: Furnish manufacturer certification materials comply with Contract Documents for each shipment and type of slate, signed by supplier and installer.

Maintenance Instructions: Furnish maintenance instructions including information regarding recommended materials and methods for cleaning and maintaining slate flooring systems.

1.04 QUALITY ASSURANCE

Source: Obtain each stone from single quarry source, with consistent color range and texture throughout work; do not change sources or kinds of materials during course of work.

Installer Qualifications: Firm with minimum five years successful experience completing installation similar to that required.

Preinstallation Conference: Conduct meeting at site prior to commencing work related to slate flooring installation.

Require attendance of parties directly affecting installation. Review procedures and coordination required with related work.

Field Mock-Up: Provide mock-up of each type of installation using approved materials and specified methods of installation. Obtain Architect’s acceptance of mock-up prior to start of installation. Approved mock-up may be incorporated into Project.

1.05 DELIVERY, STORAGE AND HANDLING

Handle material to prevent chipping, breakage, soiling or other damage. Protect edges of materials with wood or other rigid materials. Place and stack skids and units to distribute weight evenly and to prevent breakage or cracking.

1.06 SITE CONDITIONS

Provide sufficient heat and ventilation in areas where work is being performed, so as to allow to properly set, maintain for minimum 7 days after completion. Take precautionary measures necessary to ensure excessive temperature changes do not occur.

PART 2 - PRODUCTS

2.01 MATERIALS

Slate: Echeguren Slate Inc. 1495 Illinois Street, San Francisco, CA 94107; Telephone 415-206-9343; Fax 415-206-9353.

Type: [Select one or more as applicable, contact manufacturer for additional options.]
African Slate-Multicolor: Multicolor Select, 12 inch by 12 inch by 1/2 inch gauged.
Chinese Slate-Aqua Rose: Desert Rose, 12 inch by 12 inch by 3/8 inch gauged.
Chinese Slate-Black: Black, 16 inch by 16 inch by 3/8 inch to 5/8 inch.
Chinese Slate-Jade Green: Jade, 12 inch by 24 inch by 3/8 inch to 3/4 inch.
Chinese Slate-Lotus: 24 inch by 24 inch by 1/2 inch to 1 inch.
Indian Slate-Forest Green: Emerald Green, 12 inch by 12 inch by 3/8 inch to 5/8 inch milled.
India Slate-White Mara Quartzite: White Quartzite, 16 inch by 16 inch by 3/8 inch to 3/4 inch.
Vermont Slate-Black: 12 inch by 12 inch by 1/4 inch gauged.

Flooring and Paving Slate: Provide non-slip units with minimum 0.60 coefficient of friction when tested in accordance with ASTM C 1028.

Reinforced Portland Cement Setting Bed: Portland cement bed conforming to ANSI A 108.1 and TCA recommendations including separator sheet and reinforcing mesh.

Portland Cement: ASTM C150, Type 1, white, non-staining.

Hydrated Lime: ASTM C207, Type S.

Sand: ASTM C144, clean, free of substances harmful to stone, mortar, and adjacent materials.

Reinforcing: 2 inch by 2 inch, 16/16 gage galvanized steel welded wire mesh.

Separator Sheet: Minimum 6 mil polyethylene sheet. Where over waterproof membrane, separator sheet may be deleted.

Medium (Unreinforced) Portland Cement Setting Bed: High-strength medium bed thickness, Portland cement based formula applications designed specifically for stone setting beds; comply with ANSI A118.1 and Ceramic Tile Institute 64-1.

Acceptable Manufacturer: Custom Building Products/Custom Marble and Granite Adhesive Mortar Mix. Substitutions: Refer to Division 1.
Bond Strength: 300 psi, ASTM C 482 (7 day).
Compressive Strength: 2500 psi, ASTM C 109 (7 day).

Latex Thin Set: Thinset bond coat, consisting of latex-cementitious mortar conforming to ANSI A 118.4.

Acceptable Manufacturers:
Custom Building Products.
Mapei Corp.
Laticrete International Inc.
Substitutions: Refer to Division 1.

Grout: ANSI A 118.6, latex-cementitious type, uniform in color, resistant to shrinkage. [Special Note: Other grout systems are available, review TCA Handbook.]

Acceptable Manufacturers:
Custom Building Products.
Mapei Corp.
Laticrete International Inc.
Substitutions: Refer to Division 1.

Colored Mortar Aggregate: Ground sound stone, as required to match approved sample.

Color Admix: ASTM C979, pure, non-fading mineral oxides designed and mixed to provide uniform color Match unless otherwise indicated.

Waterproof Membrane: Refer to Division 7.

Cleaning and Sealing Materials: Types as recommended by slate supplier.

Cleaner: HMK Stone & Marble Care (415-546-3822)/R55 Regular [R63 Acid Base Extra Strength].
Clear Sealer: HMK Stone & Marble Care/S34 penetrating sealer with minimal color change.
Color Enhancer Sealer (Matte Finish): HMK Stone & Marble Care/S35 penetrating sealer and color enhancer, with matte finish.
Color Enhancer Sealer (Satin Sheen): HMK Stone & Marble Care/S37 penetrating sealer and color enhancer, with satin sheen.

2.02 FABRICATION

Provide suppliers standard field sizes as indicated; fabricate special pieces as shown and as detailed on final shop drawings. Field cuts for fit and clearance to match quality of shop cut stone. Provide openings and similar spaces and features as required for contiguous work.

2.03 MIXES

Site-Made Setting Mortar: ASTM C 270, Type M mortar; mix and proportion cementitious materials for site-made leveling coats, setting beds and grout.

Manufactured Mortars and Grout: Mix and proportion pre-mixed setting beds and grout materials in accordance with manufacturer's recommendations.

PART 3 - EXECUTION

3.01 INSPECTION

Examine subbase and supporting structure for stone.

Start of work indicates acceptance of conditions.

3.02 PREPARATION

Prior to installing , ensure surfaces are level.

Tolerances:
Bed Set Slate: Maximum surface variation of 1/4 inch in 10 feet.
Thin Set Slate: Maximum surface variation of 1/8 inch in 10 feet.

Ensure surfaces are clean and well cured, and sloped to drains where drains are provided.

Do not commence work until surface conditions are within tolerances required for proper installation; apply latex leveling material where necessary to meet required tolerances.

Clean stone before setting by thoroughly scrubbing with fiber brushes followed by thorough sponging with clear water; use only mild cleaning compounds that contain no caustic nor harsh fillers or abrasives.

Waterproof Membrane: Take special care not to damage waterproofing system. Comply with waterproof membrane manufacturer recommendations for installation of over waterproof membrane.

3.03 GENERAL INSTALLATION REQUIREMENTS

Do not use material with chips, cracks, voids, discolorations or other defects which might be visible or cause staining in finished work.

Execute work with skilled mechanics and employ skilled fitters at site to do necessary field cutting as stone is set.

Provide openings and other spaces as shown or required for contiguous work. Close up openings in stone after other work is in place. Use materials and set to match surrounding work. Field cuts for fit and clearance to match quality of shop cut stone. Provide openings and similar spaces and features as required for contiguous work.

Set stone in accordance with approved patterns and mock-up.

Joint width: Cut to provide uniform 1/4 inch wide joints. [NOTE: Contact slate supplier regarding specific slate selection before specifying tighter joints.]

Grouting: Comply with ANSI A 108.10. with slate supplier recommendations, and with grout manufacturer recommendations and installation instructions.

3.04 BED SET STONE INSTALLATION

Reinforced Portland Cement Setting Bed: [NOTE: Use reinforced setting for ungauged slate and as needed to prevent cracking in substrate from broadcasting through slate installation.]

Apply Portland cement mortar setting bed, install reinforcing mesh, and apply additional Portland cement mortar to proper line and tamp firmly.

Lap reinforcing minimum one full mesh and install so reinforcing is approximately in middle of mortar bed.

Setting bed shall be of uniform 1-1/4 inch nominal thickness, allowing for variations necessary for indicated slopes.

Apply setting bed over areas no greater than can be covered while setting bed remains plastic.

Trowel or brush thin layer, 1/32 inch to 1/16 inch thickness, of latex-cement paste over setting bed or to slate.

Apply slate in place and beat firmly into straight, uniform joints.

Bring surfaces to true level at proper elevation.

Complete beating and leveling within one hour of setting; wipe clean with soft damp cloth.

Medium (Unreinforced) Portland Cement Setting Bed: [NOTE: Use medium setting bed for ungauged slate and where reinforcing is not necessary.]

Thoroughly clean subfloor and moisten without soaking.

Apply Portland cement mortar setting bed to proper line and tamp firmly.

Setting bed shall be of uniform 1/4 inch to 1 inch thick nominal thickness.

Apply setting bed over areas no greater than can be covered while setting bed remains plastic.

Trowel or brush thin layer, 1/32 inch to 1/16 inch thickness, of latex-cement paste over setting bed or to back of slate.

Apply slate in place and beat firmly into straight, uniform joints.

Bring surfaces to true level at proper elevation.

Complete beating and leveling within one hour of setting; wipe clean with soft damp cloth.

3.05 THIN SET STONE INSTALLATION [NOTE: USE THIN SET FOR GAUGED SLATE.]

Install in accordance with ANSI A 108.5, slate supplier recommendations, and latex admix manufacturer recommendations and installation instructions for type of substrate.

Latex-Cement Thin Set Floors over Concrete: TCA F113.

Latex-Cement Thin Set Floors over Waterproof Membrane: TCA F122.

Place in accordance with patterns indicated on Drawings; carefully plan layouts, ensure pattern is uninterrupted from one surface to the next and through doorways.

Patterns: [Random irregular; Rectangles; Squares; Random rectangular; Coursed; Other].

Apply latex thin set to back of where necessary to ensure 100% bond between bond coat and substrate; replace tiles which break due to voids between and substrate.

Place thresholds level and true to line; in correct alignment with , doors and partitions.

Neatly cut around fixtures and drains; accurately form corners, base, intersections and returns.

Locate expansion joints, control joints, contraction joints, and isolation joints where indicated; where not indicated, provide as recommended by supplier and as approved by Architect.

Ensure joints are uniform in width, subject to normal variance in tolerance allowed in slate size; ensure joints are watertight, without voids, cracks, excess mortar or grout.

Sound slate after setting, remove and replace hollow sounding units.

Allow to set for a minimum 48 hours prior to grouting.

Grout to comply with recommendations of grout manufacturer and as specified.

Leave completed installation free of broken, damaged and faulty slates.

3.03 CLEANING AND SEALING

After completion of work, point open joints and replace defective work.

Clean surfaces free of foreign matter upon completion of grouting.
Use clean water and stiff bristle fiber brushes. Do not use wire brushes, acid type cleaning agents, cleaning compounds with caustic or harsh fillers, or other materials or methods which could damage stone.

Seal slate and grout surfaces as recommended by supplier for materials and applications involved; comply with sealing material manufacturer's recommendations.

For further information, contact:

Echeguren Slate, Inc.
1495 Illinois St.
San Francisco, CA 94107

(415) 206-9343

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