Waterproofing

Surface preparation

The surface of the concrete shall be sound, clean and uncontaminated.
This preparation shall be such as to leave a sound exposed concrete surface free from dust, loose particles and any deleterious matter. If the concrete surface is defective or has laitance, it must be cut back to a sound base. Oil, grease, varnishes, rust, dust and mould on metal surfaces shall be removed by wire or stiff brushing and grit blasting then wiped with SOLVENTE 10 prior to priming. New concrete or cementitious surfaces should be at least 28 days old and have moisture content not exceeding 5%. Old or existing surface should be refurbished mechanically to ensure clear and sound substrate.

Crack treatment

Shrinkages and non-moving structural cracks less than 1.0mm shall be filled with a pre-treatment strip of ELASTOTHANE TR of 1.0mm thick extended to 75 mm on both sides of the crack. Voids and honeycombs shall be patched with BETOFINISH C or EPOFINISH C allowing the area to cure before applying the membrane.

Right Angle Bends
All right angle bends must have a coving detail installed. In areas where parapet walls, columns, pipe penetrations are present, a 45° coving fillet shall be made at all corners using BETOCEM FIBER, a Fiber reinforced shrinkage controlled mortar for concrete repair to the water saturated cured surface.
All other angles, joints, protrusions and stress joints should be pre-treated with a heavy application of ELASTOTHANE TR extending 150mm on both sides of the coving.

Movement Joints
Expansion and movement joints should be sealed with ELASTOSEAL PU25, a polyurethane sealant. When cured a stripped layer of ELASTOTHANE TR, 200 mm wide shall be applied and centered over all the sealed joints. While the membrane is still wet, fibre mesh shall be pressed to soak before saturating it again with another coat of ELASTOTHANE TR till it is fully covered. Allow to cure before the general application. The surface shall be prepared.

Priming
In case of very porous substrates, it is advisable to apply ELASTOTHANE TR diluted with 20% of SOLVENTE 10 as primer. The primer should be left to achieve a tack-free condition before applying the top coat.

Mixing
ELASTOTHANE TR should be stirred before use until a uniform color and consistency of the product is achieved.

Application
ELASTOTHANE TR shall be applied by brush, roller, trowel or airless spray in 2 coats to achieve a minimum dry film thickness of 1.0 mm. The two coats must be applied at right angles to one another. A layer of ARMOFLEX, a fiber glass mesh should be embedded between the two ELASTOTHANE TR coats over pipe culverts, floor drains, corner joints and floor / wall junctions.

Cleaning
Tools and equipment used for ELASTOTHANE TR should be cleaned with SOLVENTE 10 directly after use.

Recommendations

• Don’t apply the product with imminent rain forecast, or on humid support.
  
• ELASTOTHANE TR should not be applied on surfaces with a risk of rising dampness and should not be applied at temperature below +5°C.
• The maximum application life for the opened pack is up to 48 hours if stored in closed and dry container.
• Water test should be run after the membrane is fully cured.
  
• During the peak temperature of the day in the summer season, working area should be covered to prevent direct sun effects.
  
• It is recommended to spread sufficient clean silica and to the final wet coat of ELASTOTHANE TR before applying tile adhesives. Tiling or finished floor installations should be carried out as soon as possible after full cure of membrane is established.