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Related Content: Specification MSDS

CEM-KOTE® FLEX ST
Flexible Cementitious Waterproofing

PRODUCT DESCRIPTION
Basic Use
CEM-KOTE FLEX ST is designed for positive and negative waterproofing of concrete structures in new construction and restoration.  It is suitable for water and wastewater tanks, secondary containment structures, tunnels, concrete slabs, balconies and patios with light to medium traffic. In new construction, where superior flexibility is required (waste water treatment facilities), CEM-KOTE FLEX ST is reinforced with REINFORCING FABRIC HD throughout.  In restoration, REINFORCING FABRIC NW is used just over the cracks to provide bridging.

Composition and Materials
CEM-KOTE FLEX ST is a highly flexible, fibre-reinforced, breathable, cementitious slurry, consisting of dry Component A and liquid Component B.

ANSI/NSF Standard 61 Drinking Water System Components

Limitations
Do not apply CEM-KOTE FLEX ST when the temperature is expected to be below 4°C (40°) within 48 hours, or when rain is imminent.  Follow hot weather concreting precautions when applying CEM-KOTE FLEX ST at temperatures exceeding 25°C (77°F) or under sunny and windy conditions.  For low temperature exposures, use CEM-KOTE FLEX PLUS.

Health and Safety
CEM-KOTE FLEX ST is non-toxic.  Your skin might be sensitive to hydraulic cement or the liquid additive.  We recommend use of rubber gloves.  Avoid contact with eyes and prolonged contact with skin.  If contact occurs, flush immediately with water.  Seek medical advice if irritation occurs.  Harmful if digested.  Keep product out of reach of children.  FOR INDUSTRIAL USE ONLY.  Consult MSDS for additional information.

Colour
Industrial Grey, Light Grey, White.

Packaging
CEM-KOTE FLEX ST Premix Kit, consists of dry Component A, packaged in 16 kg (35.3 lb.) bags and liquid Component B, packaged in plastic jugs.  Industrial Grey in 4.8 L (1.3 U.S.gal.); Light Grey in 4.8 L (1.3 U.S.gal.).

Yield
CEM-KOTE FLEX ST; Yields 10.5 L (0.37 ft.³) and covers approximately 6.6 m² @ 1.6 mm (70.6 ft.² @ 63 mils) thickness per kit, applied in two (2) coats.

The actual coverage will depend on surface roughness and the thickness applied. The applicator must carry out a sample application to determine the actual coverage for the given substrate and application thickness.

Storage and Transportation
CEM-KOTE FLEX ST, when stored on pallets in a dry, cool area, free from moisture and direct sunlight, has a shelf life of 12 months. The liquid Component B must not freeze. Packaged 40 kits per pallet.

INSTALLATION
Follow manufacturer’s most recent application procedures and details to assure quality installation.  The applicator must, prior to bid, confirm the detailing, use of the REINFORCING FABRIC, correct surface preparation and application procedures with manufacturer’s technical services.  The applicator must also arrange a pre-installation meeting with the manufacturer’s technical representative, general contractor, and site engineer to review the installation procedure. The project specification supersedes the Gemite guide specification.

Surface Preparation
Remove all deteriorated and loose concrete, form release agents, oil, grease, laitance, dust, dirt and efflorescence by dry or wet sandblast, shotblast, or high-pressure water (minimum 34.5 MPa [5,000 psi]).  Repair deeper areas using GEM-PLAST TC or MEADOW-CRETE® OV from W. R. MEADOWS.  The proper surface preparation is essential for a successful waterproofing and concrete repair using CEM-KOTE FLEX ST.  Remove all loose rust from any exposed reinforcing steel and apply two coats of PATCH-PRIME™ rust proofing from W .R. MEADOWS.

Crack Treatment
All cracks must be treated using CEM-KOTE FLEX ST and REINFORCING FABRIC NW.  Pre-fill any open cracks larger than 2 mm (80 mils) with CEM-KOTE FLEX ST.  Apply a thin coat of CEM-KOTE FLEX ST, 15-25 cm (6-10”) wide, over the crack.  Embed a strip of REINFORCING FABRIC NW into the wet CEM-KOTE FLEX ST and apply a second coat to fully cover the REINFORCING FABRIC NW.

Cove Installation
Install 40 – 50 mm (1 1/2” - 2”) “coves” in vertical and horizontal corners (all 90º angles) using MEADOW-CRETE OV.  All the coves are also reinforced with well embedded and covered REINFORCING FABRIC HD.

Mixing
Thoroughly mix the liquid Component B prior to its use.  Use paddle or helix mortar mixer or heavy-duty drill (400-600 rpm) with a mixing paddle.  Pour approximately 80% of component B into a clean mixer and gradually add the dry component A, while mixing, until a smooth and lump free mix is obtained.  Lumps will form if the dry material is added suddenly into the liquid.  Add the remaining liquid, while mixing, to achieve the consistency required for a given application.  A small amount of water can be added, if required, at higher ambient temperatures.

Application
Trowel or brush apply CEM-KOTE FLEX ST to a minimum thickness of 1.6 mm (63 mils) in two (2) coats to a saturated surface dry (SSD) concrete.  CEM-KOTE FLEX ST can also be spray applied using a hopper gun or positive displacement (moyno or carrousel) pump, with a suitable plastering spray nozzle. When using spraying, brush each coat to eliminate all pinholes. The second coat must be applied into a wet first coat, usually within 10-15 minutes, depending on temperature and relative humidity. The delayed application of the second coat could result in its de-bonding.

Reinforcing Fabric
In some projects, REINFORCING FABRIC HD may have to be used throughout.  When using REINFORCING FABRIC HD, apply first a thin layer of CEM-KOTE FLEX ST by brushing or spraying.  When spraying, brush each coat to eliminate all “pinholes.”  Embed REINFORCING FABRIC HD into the first coat and follow with a second coat.  REINFORCING FABRIC HD must be fully covered and must not protrude through the surface.  The total minimum applied thickness of CEM-KOTE FLEX ST, including REINFORCING FABRIC HD, must be 1.6 mm (63 mils).

Curing
Cure CEM-KOTE FLEX ST by air-drying for a minimum of 3 days prior to a continuous exposure to water.  Protect fresh applications from rain, strong wind and intense sunlight for 12 hours.  When working under tarps at freezing temperatures, use electrical heaters and “forced” venting. Avoid using propane heaters to prevent “carbonation” of the material.

Cleanup
All tools must be cleaned with water immediately after use. Cured material can only be removed mechanically.

WARRANTY
A limited twelve (12) month Material Replacement Warranty is available.  For details, contact Technical Service.

TECHNICAL SERVICE
For advice on suitability of CEM-KOTE FLEX ST for a specific application, specification assistance and application advice, contact Technical Service at 1-800-563-3618.

Short Specification
The waterproofing will be CEM-KOTE FLEX ST, a flexible, polymer modified cement, manufactured by Gemite Products Inc.  It will be mixed and applied according to the current manufacturer’s specifications and recommendations.  The suitability of CEM-KOTE FLEX ST for a specific use, the surface preparation method, detailing and application procedures must be checked with the Technical Services prior to bid.

MANUFACTURER
Gemite Products, Inc.
1787 Drew Road,
Mississauga, ON L5S 1J5
Phone: 905-672-2020
Fax: 905-672-6780
Website: www.gemite.com

2010-03-11