7.4 Grit coating of a block-built wall


This coating work method is indicative and deals with the grit coating of a block-build wall with the ELAPROOF + SAND system. The ELAPROOF + SAND plinth protection system consists of ELAPROOF PRIMER primer, ELAPROOF + SAND Plinth Protection and ELACOAT TOPCOAT RAL / ELACOAT TOPCOAT topcoat

The coating work method is not a repair plan or a construction plan. The overall design of the coating is always the responsibility of the site-specific designer.

Platform refurbishment

Sufficient tensile and compressive strength is a key factor in the functionality of coating materials. The concrete or screed base must be durable and have sufficient compressive strength. The substrate must be clean, sufficiently dry and free of all impurities such as dirt, oil, grease, weak coatings and surface treatments.

If necessary, weak layers are removed with sufficiently effective mechanical methods such as grinding or milling. Regarding the coating, the best end result is achieved if it is carried out on a clean concrete surface, the roughness of which corresponds to a wood-rubbed concrete surface.

Patching and leveling of the platform

Any holes in the surface are filled with a filling compound suitable for the coating combination before coating. If the concrete substrate to be coated has jagged or uneven areas, they must be leveled with a screed suitable for the coating combination. It should be noted that unevenness tends to show on the coated surface.

Only special products that meet the compression and tensile strength requirements mentioned above may be used to repair, straighten and level the substrate. The suitability of the above-mentioned products as a base for a coating to be applied as a liquid must always be confirmed by from the supplier of the product.

Waterproofing of the back side of the block-build wall

The moisture-technical functionality of a wall coated with ELAPROOF + SAND plinth protection must be ensured by treating the back side of the wall to make it waterproof as well. The easiest way to achieve this is by implementing waterproofing with the ELAPROOF coating.

When implementing waterproofing with ELAPROOF coating, follow the instructions given by this coating work method regarding the pretreatment and priming of the substrate.


Before starting the waterproofing, the ELAPROOF coating must be mixed. Use a whisk in the mixer that does not introduce air into the coating during mixing, e.g. wire whisks from the COLLOMIX KR series.

The primed substrate is coated with ELAPROOF coating. The coating is applied to the substrate with a steel trowel, roller or, if necessary, a high-pressure sprayer.

The ELAPROOF coating is applied to the substrate in two separate applications. The consumption of each application should be approx. 0.9 l/m2, making the total consumption approx. 1.8 l/m2. It is recommended that the realized dry film thickness be approx. 1.0 mm.

The drying time between applications of the ELAPROOF coating depends greatly on the conditions at the installation site. When the conditions are approx. + 20 °C, 50% RH, the second application can be carried out approx. 5 h after the first application. A lower temperature and higher air humidity will significantly extend the drying time.
The twice-applied ELAPROOF coating is suitable for further processing after approx. 12 h under conditions of + 20 °C, 50% RH.

Earth pressure

In walls whose back side is subjected to earth pressure, the ELAPROOF coating acting as a waterproofing must be protected against wear caused by earth pressure with insulation boards or dam boards. Among the insulation boards, PIR insulation boards work best for the purpose. When using a dam plate, its installation direction must be taken into account. The dam plate, which acts as a protection for the waterproofing, should be installed with the smooth side facing the waterproofing, so that the ridged edges of the dam plate do not cause pressure in the direction of the waterproofing.


Prior to coating, cleaned and repaired concrete substrates are primed with ELAPROOF PRIMER diluted 1: 2 with water (1 part primer: 2 parts water). The primer may be damp before applying ELAPROOF + SAND Plinth Protection.


Before starting the coating, the ELAPROOF + SAND Plinth Protection must be mixed. Use a mixing paddle in the mixer that does not take air into the sealant when mixing, eg COLLOMIX KR series mixing paddle.

The primed substrate is coated with ELAPROOF + SAND Plinth Protection. The coating is applied to the substrate with a steel spatula.

ELAPROOF + SAND Plinth Protection is applied to the substrate in two separate applications. The consumption of each application must be at least approx. 1.0 kg / m2. In which case the total consumption is at least 2.0 kg / m2. The actual dry film thickness must be min. 1.0 mm.

The drying time between coats of ELAPROOF + SAND Plinth Protection depends largely on the conditions at the installation site. At conditions of approx. + 20 °C, 50% RH can be applied a second time approx. 5 h after the first application. Lower temperatures and higher humidity significantly extend the drying time.

The ELAPROOF + SAND Plinth Protection applied twice can be applied after approx. 12 hours in conditions + 20 °C, 50 % RH.


If necessary, the dried ELAPROOF + SAND Plinth Protection coating is treated with clear ELACOAT TOPCOAT or tinted ELACOAT TOPCOAT RAL topcoats to facilitate cleaning and maintenance or to achieve the desired color tone.

In the topcoat, the topcoat component A is first mixed for 1 to 2 minutes, then the hardener component B is added to the mixed topcoat A and mixed again for 2-3 minutes. Use, for example, the COLLOMIX KR series wire whisk for mixing.

The mixture is applied on top of the dried ELAPROOF coating with a short-pile roller (6 – 7 mm) by cross-rolling. The consumption of the topcoat is approx. 110 – 200 g / m2 / application, depending on the degree of roughness of the selected ELAPROOF + SAND coating. The topcoat is dry to dry after approx. 16 h at + 20 °C, 50% RH. The full duration of mechanical stress is achieved under the above conditions in about 4 days and the full chemical duration in about 7 days.

NOTE! Some shades of ELACOAT TOPCOAT RAL topcoats may require 2 to 3 coats to achieve sufficient coverage! See a separate table for the coverage of ELACOAT TOPCOAT RAL topcoats.

Build Care Oy owns all rights to this coating work method. Designers are free to use this coating work method when creating repair and coating plans!


Structural drawings

All structural drawings related to ElaProof products in DWG and PDF format from the ProdLib-service.

Updated: 01/2022 | JKo

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