MASTER SPECIFICATION - THIN GAUGE EPOXY TERRAZZO

1. General

1.1 Work Included

.1 Inspection of surfaces and prevailing conditions

.2 Divider strips and base beads.

.3 Installation , floors, bases and stairs

.4 Surfacing and Grouting

.5 Cleaning and Sealing.

.6 Primer - Optional

.7 Epoxy terrazzo mixes and mixing.

1.2 Related Work: Work included in other sections.

.1 Supply of mat sinkage frames or foot grilles.

.2 Supply and install vapour barrier to underside of concrete slab on or below grade to prevent moisture penetration into the slab. Excessive water must be eliminated with proper drainage below the slab.

.3 Anchors, slots, ties, sleeves, collars, pipes, bolts, inserts, sub-specialty items and underfloor electrical raceway systems built into epoxy terrazzo work.

.4 Convenient and adequate temporary 110-220 volt single phase electric service.

.5 Temporary heat, (maintained by others above 12°C and not more than 30°C) for a period of seven days before, during and following installations. If propane heat is used, heating units must be a vented type or areas must be properly ventilated.

.6 Hoisting facilities when required. Convenient clean water supply.

Spec. Note: Specify testing requirements, if required. Conductive floors are required to be tested for conductivity. Refer to NFPA #56A for method of testing.

1.3 Quality Assurance

Spec Note: A list of current members is available from the TTMAC office or at www.ttmac.com.

.1 Installer: employ skilled mechanics/applicators trained and experienced in terrazzo work. Company must be registered as members in good standing with the Terrazzo, Tile and Marble Association of Canada, with a minimum of three years proven experience. If requested by Consultant, submit a listing of at least three previously completed projects of similar size and scope.

.2 Supplier: a member in good standing with the Terrazzo, Tile and Marble Association of Canada, providing materials meeting industry recognized standards.

1.4 References

Refer to Page 52.

Thin gauge epoxy plastic matrix terrazzo-CAN/CGSB81-GP-6M-77 Physical Properties, CAN/CGSB81-GP-10-77 Application.

.1 TTMAC: Terrazzo, Tile and Marble Association of Canada .

.2 NFPA: National Fire Protection Association

Spec. Note: Describe quantity and size of samples and other special requirements.

1.5 Submittals

.1 Submit three (3) samples 152 mm x 152 mm of each colour and type of terrazzo mounted on a suitable backing for approval by the consultant. Submit three (3) 152 mm length of each type (colour) of divider strips. An allowance of $100.00 for each colour and type of terrazzo to be carried to cover cost of samples provided by others.

Spec Note: Terrazzo plates are to be used as a guide only.

.2 Submit four (4) copies of the TTMAC latest edition Maintenance Guide for inclusion in the data book. Give specific warning of any maintenance practice or materials that may damage, or disfigure the finished work, or alter the coefficient of friction (slip resistance) of the finished surface.

1.6 Delivery, Storage and Handling

.1 Deliver, store and handle products in a manner to avoid damage to containers and/or bags. Maintain a minimum temperature of 12°C for storage.

1.7 Site Conditions

.1 Examine the areas in which the work of this Section is to be installed.

.2 Do not proceed with installation of terrazzo topping until improper conditions have been corrected.

.3 Protect work during installation and protect finished surfaces while other work is being executed in the area.

.4 Check for appropriate heating facilities and required working conditions.

Spec Note: Subfloor not to vary more than 6 mm from true plane of 3049 mm.

Spec Note: Consult with the epoxy manufacturer in case of excessive vapour transmission, excessive moisture or high alkaline of the concrete and obtain recommendations for procedure.

.5 Verify that concrete slab is smooth, sound and clean, free of any compounds or curing agents and at proper levels to receive terrazzo topping. Epoxy terrazzo, as specified, is not intended to level substrate and will only follow contour of the concrete slab. If for any reason, the subcontractor questions suitability of substrate for bonding, any work required to eliminate non-conformity is the responsibility of others. Any materials used to correct non-conformity must be compatible with the epoxy system selected and be approved by the terrazzo contractor and manufacturer.

Spec. Note: Allow at least 28 days for concrete curing.

Spec Note: The epoxy manufacturer's representative to inspect site conditions and provide spot inspections during installation tested with a moisture tester for acceptable dryness.

.6 Do not install topping until concrete slab has properly cured and moisture content is between 3% and 4% by weight of concrete determined by a moisture tester reading.

.7 Verify the base slab temperature is not less than 12°C before applying topping.

.8 Do not permit smoking during installation. Post "No Smoking" signs.

Spec. Notes: Describe requirements for alternatives that may be necessary for consideration by the Specifier.

1.8 Alternatives

Spec. Note: Describe if required.

.1 Allowance

Spec. Note: Identify requirements if any.

.2 Unit Prices

.3 Warranty: One year from date of completion of terrazzo installation.

2. Products

2.1 Materials

.1 Epoxy matrix/resin, a two-component material consisting of resin, hardener and pigment.

Spec. Note: Specify colour and origin of chips. Recommended size of chips 30% No.0 and 70% No. 1 for 6 mm matrix thickness. For 10 mm thickness it is recommended that chip size be 25% No. 0 , 45% No. 1 and 30% No. 2 , as per epoxy manufacturer's recommendations.

.2 Specify size and type of aggregate, marble, granite, glass, onyx or plastic chips.

2.2 Divider Strips

Spec. Note: Use plastic dividers for conductive floors or preferably no dividers.

.1 Special type, white alloy of zinc, brass, stainless steel or plastic

.2 Base Bead Top Strips: Metal or plastic strips used as a leveling stop on top of terrazzo base.

.3 Cove Dividers: Metal or plastic strips used for patterns, wall base or as colour separation.

.4 Conductive Matrix: See manufacturer's specifications

.5 Primer: See manufacturer's specifications.

Spec Note: Sealers to be ULC listed as "slip resistant".

.6 Sealer and maintenance products: Refer to latest edition of TTMAC Maintenance Guide

3. Execution

3.1 EXAMINATION

.1 Verify existing conditions are ready to receive work.

.2 Verify that substrate surfaces are clean, dimensionally stable, cured and free of contaminants such as oil, sealers and curing compounds.

.3 Verify that concrete has been allowed to cure for a minimum of 28 days (preferably 90 days or longer).

.4 Verify that concrete floors scheduled to receive thin gauge epoxy plastic matrix terrazzo has a smooth steel trowel finish. Ensure concrete slabs have been finished with a maximum variation of 6 mm in 3049 mm from the required plane and not more than 1.5 mm in 305 mm when measured from high points in the surface.

.5 Notify Consultant in writing of unacceptable substrate conditions. Beginning of installation implies acceptance of existing conditions.

3.2 Preparation

.1 Clean concrete slab. Remove laitance by shotblasting, sandblasting, grinding or scarifying. Clean and vacuum surface. Rinse concrete surface if required with water and allow to dry thoroughly.

.2 Mask adjacent surfaces.

.3 Refer to 1.7 Site conditions

SPEC NOTE: Aggregate chip coverage for hand trowel installation must show a density in excess of 70% exposure on the finished terrazzo surface. For machine trowel installations, aggregate chip coverage must show a density in excess of 80% exposure on the finished terrazzo surface.

3.3 Installation

.1 Terrazzo Base: Where required, install base bead top strips at specified heights straight and level. Install L or T shaped strips and/or coved base dividers in line with floor divider strips.

.2 Terrazzo Floor: Prime concrete surface as required by manufacturer. Mix epoxy resin with hardener as per manufacture's stipulated ratios. Blend aggregate chips thoroughly in a low speed drum mixer. Trowel mixture to pre-determined levels and thickness. Sprinkle mixture with dry aggregate chips using the same formula as in the original mixture to obtain finish surface consistent with approved samples. Trowel surface to compact mixture. A power trowel should be used for large areas or wherever possible. Allow to cure for 24 hours. Grind surface by machine with No 24 grit abrasive stones or use a dry grinding method, followed by grinding with No. 80 grit stones. Immediately following initial grind, wash terrazzo surface with water. Allow area to dry thoroughly and apply epoxy matrix grout consisting of resin, hardener and filler to fill any voids. Allow grouted surface to cure a minimum 24 hours, then grind using No. 80 grit stones or finer, to a maximum of 120 grit stones. Rinse and allow area to dry thoroughly. Apply sealer as per manufacturer's recommendations.

.3 Conductive Floors: Refer to conductive epoxy manufacturer's recommendations.

.4 Cleaning and Sealing: Refer to latest edition of TTMAC Maintenance Guide.

.5 Protection: Standard protection includes 1 layer of Kraft paper. If additional protection is required, it must be by others. General Contractor to provide adequate protection to completed terrazzo work. Protect work of other trades. Prohibit traffic during installation and for 48 hours after completion. Protect floor from impact and vibration for a minimum of 48 hours after installation. Protect base from impact, vibration, heavy hammering on adjacent and opposite walls for at least 48 hours. On completion of terrazzo floor it is the responsibility of the owner/agent or general contractor to protect the floor from damage.

END OF SECTION