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Grupo Cementos Portland ValderrivasGrupo Cementos Portland Valderrivas

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  1. Mortar - Bagged mortar - Products and recommendations - Spray mortar - Valsec Piedra

Mortar - Bagged mortar - Products and recommendations - Spray mortar - Valsec Piedra

Product range: Spray mortar

Valsec Piedra

Single layer mortar for stone finish.

Impermeable, transpirable, decorative pigmented mortar for a stone finish on vertical walls.

Type OC W2 CSIV (UNE EN 998-1).

Supply conditions

Outdoor use. On standard construction substrates: normal concrete, concrete blocks, ceramic bricks, and mortar dressing.

Condiciones de suministro

25 kg bags protected by plastic sheet.


White, Ivory, Pink, Wood, Red, Bordeaux, Green, Stone, Grey. (See color chart).

Mixing instructions

Mix VALSEC MONOCAPA PIEDRA with clean water to obtain a smooth paste (6.5 litres/bag). The mix can be prepared manually or mechanically.

The working time is 30 minutes depending on the environmental conditions. When preparing the mortar, use the same amount of water and mixing time for the entire process. Do not use any admixtures without authorisation from the manufacturer.

Substrate preparation

Substrates must fulfil the following conditions:

  • They must be strong, clean and stable.
  • Do not use on water-repellent substrates or on substrates with plaster, paint or plastic coating.
  • In the case of irregular or uneven walls, a mortar levelling course must be applied first.
  • It is advisable to roughen surfaces which are too smooth or not very porous.
  • On very smooth surfaces, an adherence layer is recommended consisting of a fine layer of mortar mixed with a cement-compatible acrylic emulsion.
  • The substrate should not be excessively dry or waterlogged. In warm weather, dampen the wall before application; spray with clean water on the following day.
  • Use alkali-resistant fibreglass mesh as a bridge between different substrates. The mesh must overlap at least 20 cm on each side of the joint.

Mortar made from white cement, graded aggregate, organic and inorganic admixtures, waterproofing compounds and mineral pigments..

Type OC CSIV W2 (UNE EN 998-1)
Granulometry (max.) 1,5 mm Water proportion 26 % ± 1 %
Working time Aprox. 30 min. Apparent density 1,3 ± 0,1 kg/m3
Water absorption by capillarity (UNE EN 1015-18) < 2 g/dm2* min1/2 Working temperature +5ºC a 35ºC
Water vapour permeability (UNE EN 1015-19) ≤ 1,0 ml/cm2 48h Application thickness ≤ 15 mm
Compressive strength (UNE EN 1015-11) ≥ 6 Mpa Approximate yield 125 ± 2 kg/m2
Adhesion after weathering cycles (UNE-EN 1015-21) ≥ 0,3 Mpa FP:B Fire resistance (UNE EN 13501-1) A1
Instructions for application

Apply with spray or trowel in layers of 10-15 mm. Divide the work area into smaller panels with laths and float the mortar to obtain a level surface. Respect expansion joints and treat them appropriately.

Leave an open time of 15-45 minutes, depending on the weather, for the mortar to harden. It is important to attain the optimum level of setting before dashing with marble stone.

To ensure adhesion, the mortar should be hard and damp throughout. Once it has started to harden, dry-dash with marble stone and press slightly with float. The dashing stone should not be wet. Remove the laths the following day, once the mortar edges no longer crumble.

The mortar layer should be at least 10 mm thick. To avoid of carbonation and colour changes, do not use if there is a risk of rain or frost.


VALSEC MONOCAPA PIEDRA (OC CSIV W2) fulfils all the obligatory quality standards under UNE EN 998-1.

VALSEC single-layer mortars are produced in industrial dry mortar plants with quality assurance systems certified by AENOR in accordance with the UNE EN ISO 9001:2000 standard.

The data is based on trials performed in our control laboratory and is the result of extensive experience with the products made by the Cementos Portland Valderrivas Group. Variations in working conditions on site may lead to changes in performance.


Store in a dry place, protected from frost and direct sunlight. If properly stored, the product may be used up to 12 months after manufacture.


This product contains cement. Avoid contact with eyes and skin, and do not inhale the dust. Use rubber gloves and goggles when handling. Keep out of reach of children.

Note: Cementos Portland Valderrivas is not responsible for inappropriate use of the product or for unexpected outcomes arising from its usage, since the application conditions and methods are beyond our control. The customer is responsible for ensuring correct use of the product.

© Cementos Portland Valderrivas 2018. All rights reserved.