Mapei Mapelastic Foundation

Mapei Mapelastic Foundation is a two-component membrane based on cementitious binders, fine-grained selected inert materials, special additives and synthetic polymers in water dispersion.

Best Uses

Mapei Mapelastic Foundation is recommended for foundation walls, car-parks and underground environments, basins, channels and swimming pools. Also suitable for waterproofing concrete and masonry structures subject to positive or negative hydrostatic pressure.

Mapelastic Foundation is completely waterproof against positive pressure, and is waterproof against negative pressure of up to 1.5 atm (15 m column of water). Once cured, it is resistant to soluble salts which are present in seawater or in the ground, such as chlorides and sulphates. Mapei Mapelastic Foundation also has excellent bonding strength on all cementitious substrates if they have been suitably prepared. All these properties keep structures protected and waterproofed with Mapelastic Foundation perfectly dry over the years.

Some Application Examples:

• Waterproofing concrete retaining walls
• Waterproofing underground car-parks, cellars, sunken swimming pools and basins and lift pits
• Used against the counter-pressure of water
• Waterproofing breeze-block walls pre-treated with a suitable MAPEI mortar

Mapelastic Foundation fulfils all the main criteria for the EN 1504-9 Standards (Products and systems for the protection and repair of concrete structures definitions, requirements, quality control and conformity assessment. General principles for the use of products and systems and the requirements for EN 1504-2 Standards according to PI-MC-IR principles (Protection systems for concrete surfaces).

Application

Preparation of the substrate
A) Positive pressure (water under pressure directly onto the finish)
The surface to be treated must be sound and perfectly clean. Remove all cement laitance, flaky parts and traces of powder, grease, oil and mould oil by sand-blasting or washing with high-pressure water. If the structure to be waterproofed and protected with Mapelastic Foundation is in a poor condition, remove the damaged parts by hand or
mechanical demolition, or by using a hydro-demolition system or a hydro-scarifier. Then carry out repairs with ready mixed mortar from the Mapegrout range. Before applying Mapelastic Foundation, a coat of Primer 3296 consolidating and dust-repellent acrylic primer in water dispersion must be applied on the surface to improve adhesion. Dilute the primer 1:1 with water and apply with a brush or roller.

B) Negative pressure (water under pressure seeping through the substrate onto the finish)
Remove all cement laitance, paint, flaky parts and traces of powder, grease, oil and mould oils by sand-blasting or washing down with high-pressure water. Remove any gravel clusters and then fill using Mapegrout 430. Construction joints, cracks in reinforced concrete, spacers, pipe-work and other objects which pass through the concrete must be sealed using Mapeproof Swell. To seal cracks in the concrete and construction joints, demolish the area to be repaired around the said cracks or construction joint using mechanical means up to a depth of at least 6 cm. Apply Mapeproof Swell and then limit its expansion with a 6 cm border of Mapegrout 430. In the presence of water which continuously seeps through, seal off the flow using Lamposilex and then continue as described above. For pipe-work and other penetrating objects, demolish the reinforced concrete around these objects, extrude Mapeproof Swell and limit its expansion as described above. In the case of localised seeping water, seal the flow
using Lamposilex hydraulic mortar.

In both cases, seal structural joints with Mapeband TPE tape bonded to the substrate with Adesilex PG4 epoxy adhesive dusted with 0.5 Quartz. Before applying Mapelastic Foundation, a coat of Mapei Primer 3296 consolidating and dust-repellent acrylic primer in water dispersion must be applied on the surface to improve adhesion. Dilute the primer 1:1 with water and apply with a brush or roller.

Preparation of the product
Pour component B (liquid) into a suitable, clean container. Then slowly add component A (powder) while stirring with a mechanical mixer. Carefully mix Mapelastic Foundation for a few minutes, making sure that no powder remains stuck to the sides or the bottom of the container. Keep stirring for approximately 3 minutes until a perfectly homogenous mix is obtained. Leave the mix standing for approximately 2 minutes so that the polymer is completely dispersed, and then mix again for up to 2 minutes. Use a low-speed mechanical mixer for this operation to avoid too much air entering the mix. Do not prepare the mix by hand.

Manual application
Mapelastic Foundation must be applied with a roller or a trowel within 60 minutes of it being mixed in at least two coats, to give a final thickness of at least 2 mm. The second coat may be applied approximately 6 hours after the first coat. In all cases, the first coat must be perfectly dry.

Spray application
Mapelastic Foundation may also be applied by spray using a rendering machine with a smoothing and finishing lance with a nozzle up to 10 mm diameter, and an air compressor with a capacity of at least 800 l/min. The final thickness must be at least 2 mm. After applying the first layer, wait until it has cured (approximately 6 hours) and
then apply a second layer. If there is water under negative pressure, finish off the surface of each coat with a trowel to form an even, well sealed layer. For water under positive pressure, we recommend finishing off at least the first coat with a trowel.