Sika Cemflex

Uses

Sika® Cemflex® mixed with Portland cement and water forms an effective waterproofing slurry that is used in conjunction with Cemflex® Fabric for:

• Reservoirs
• Shower floors and walls
• Balcony and veranda floors (under tiles)
• Retaining walls

Sika® Cemflex® added to a sand/Portland cement slurry forms a bonding coat for:

• Plaster
• Render

The slurry can also be used for waterproofing between two skins of external brick walling.

Features & Benefits

• Watertight
• Ideal for submerged or subterranean waterproofing
• Good abrasion resistance
• Non - toxic
• Oil resistant
• UV stable

Substrate Preparation

• The concrete substrate must be sound.
• The surface must be dry and free of all contaminants such as oils, grease, coatings and surface treatments etc.
• The substrate must be prepared mechanically to remove cement laitance and achieve a profile open textured surface.
• Weak concrete should be removed and surface defects such as honeycombed areas; blowholes and voids must be fully exposed.
• Repairs to the substrate, filling of blowholes/voids and surface levelling should be carried out using the appropriate product from the Sika® Rep and SikaDur® range of materials.

Waterproofing mixing

• Mix the required amounts of Sika® Cemflex® and water first, and add the correct quantity of Portland cement slowly, while mixing, to avoid the formation of lumps. Mixing can either be achieved manually or mechanically, with small quantities of 5litres or less. Larger quantities should be mechanically mixed with a slow-speed mixer (set at 400-600 rpm). Mixing should continue until a uniform, lump-free consistency is obtained. The slurry should be mixed periodically during application to prevent settlement.

Bonding/Bagging mixing

• Sika® Cemflex® and water are mixed in equal proportions by volume. Mix clean building sand with Portland cement in equal proportions by volume and then add sufficient diluted Sika® Cemflex® and continue mixing until a uniform, lump-free consistency is obtained. Mix periodically during application to prevent settlement.

Waterproofing Slurry Application

• Saturate absorbent surfaces thoroughly with water.
• While the surface is still damp, apply a coat of waterproofing slurry. Pre-cut the Cemflex® Fabric into convenient sizes for application, then soak the fabric in the slurry.
• Remove the soaked fabric from the slurry and smooth it onto the primed substrate making sure to eliminate all air bubbles. Overlaps of adjacent fabric must be a minimum of 50mm. Once the entire area to be treated is covered, apply a generous coat of the slurry and allow to dry.
• A final coat of slurry is then applied to complete the application.

Bonding / Bagging Application

• For waterproof bagging, saturate the brick substrate and, while it is still damp, apply a coat of bonding/bagging slurry by means of a block brush.
• For bonding, saturate the substrate and, while it is still damp, apply a coat of bonding/bagging slurry by means of a block brush. Immediately apply a render of screed while the slurry is still wet.

Fish Ponds Application

• Due to the sensitive nature of fish, it is important that the fish pond is adequately washed out after applying the Sika® Cemflex® slurry. Cement is highly alkaline and will have an initial effect on the Ph of the water, so ensure that the water is conditioned and stable before introducing your fish.

Cleaning of Tools

• Remove uncured Sika® Cemflex® slurry from tools with water. Cured material can only be removed mechanically.

Local Restrictions

• Please note that as a result of specific local regulations the performance of this product may vary from country to country. Please consult the local Product Data Sheet for the exact description of the application fields.

Storage Conditions

The product must be stored properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C.

Higher storage temperatures may reduce the shelf life of the product.

Reference shall also be made to the storage recommendations within the safety data sheet.