Gripset 11Y Admixture

For cement screeds, renders, and patch mortars exposed to weather, continuous immersion, or underground dampness, Gripset 11Y is a concentrated SBR latex polymer admixture that improves adhesion, flexural strength, and water resistance. It prevents water-pathway failures in demanding wet areas, reduces the occurrence of efflorescence in screeds, and acts as a high-bond slurry primer over porous concrete, masonry, and blockwork.

What it does

Gripset 11Y modifies cement-based compounds by replacing a portion of the mixing water with SBR latex polymer. This polymer network forms within the curing cement matrix, reducing the water-to-cement ratio and closing down the capillary pathways that allow water and salt migration. The result is a highly dense mortar or screed with reduced permeability to liquids and gases, increased resistance to freeze-thaw cycles, and higher early strength development. It also increases flexural strength and durability, allowing thin-build repairs and screeds to withstand movement without cracking or delaminating from the substrate.

Where to use it

• Substrates: Concrete, masonry, renders, screeds, concrete blocks, aerated concrete, clay bricks, pavers, cement sheeting, marine plywood, wet-area particle board, asphalt, cured bitumen surfaces, and existing acrylic coatings or Gripset membranes.
• Applications: Waterproofing slurry coats, water-resistant screeds and renders, patch mortars in immersed areas, and as an adhesion and water-resistance enhancer for cement-based tile adhesives and grouts in harsh climatic conditions.

Numbers that matter

• 1.0mm wet film thickness: The target application thickness when mixed as a high-bonding primer or sealing slurry to ensure a continuous, protective barrier.
• 1 litre per 3m² coverage: The consumption rate of Gripset 11Y when mixed and applied as a primer slurry, helping you calculate material requirements for substrate preparation.
• 3mm minimum build: The lowest allowable thickness when applying mixed 11Y patch mortars as thin-build coatings in immersed or wet areas.
• 1:3 liquid-to-water ratio: The mixing ratio for screeds, renders, adhesives, and grouts to ensure correct polymer distribution without over-diluting the binder.
• 1:1 liquid-to-water ratio: The concentrated mixing ratio required for high-adhesion, water-resistant patch mortars.

How to apply

For all applications, substrates must be clean, sound, dry, and free of dust, oil, grease, curing compounds, release agents, and loose material. Mechanically remove structurally unsound layers by grinding or abrasive blasting. If the substrate is subject to active moisture or rising damp, treat it with Gripset E60 before application.

When applying screeds, renders, or patch mortars, first prime the surface with the 11Y Primer/sealing slurry. For optimum adhesion, apply the screed or mortar directly onto the wet or damp primer using a "wet-on-wet" method. Wash all tools with water immediately after use; dried material must be removed mechanically.

Mix designs

• Primer / Sealing Slurry: Mix 1 part Gripset 11Y, 1 part wash sand, and 1 part cement by volume. Mix slowly with an electric paddle mixer to a fluid consistency, let settle for 3 to 4 minutes, then re-stir lightly before applying by brush, roller, broom, or squeegee.
• High-Performance Screeds & Renders: Mix dry ingredients of 1 part cement and 4 parts fine wash grade sand. Combine with a mixing liquid of 1 part Gripset 11Y to 3 parts water.
• Patch Mortars: Mix dry ingredients of 1 part cement and 3 parts fine wash grade sand. Combine with a mixing liquid of 1 part Gripset 11Y to 1 part water.

Limitations

• Do not use on glass or glazed surfaces.
• Do not apply over raw steel or metals unless specified.
• Do not use for priming areas subject to rising moisture or negative hydrostatic pressure.
• When using as a bonding agent, always use sharp wash-grade sand and fresh Portland cement.
• Consult RLA Technical Department before applying over existing paints, membranes, coatings, or other finished surfaces to confirm suitability and preparation.