Jump Main Menu. Go directly to the main content

Grupo Cementos Portland ValderrivasGrupo Cementos Portland Valderrivas

  • We produce in a sustainable manner caring for the planet

  • We operate in Europe, Africa and United States

  • Cement, concrete, aggregate, mortar and recycling

  • The architectural challenges are built with us

  • We’re leaders in our markets

  • Specific cements and experienced teams

  • From the seashore we arrive where is needed

  • Committed to quality and the environment

  • We make It happen

You are in:
  1. Mortar - Bagged mortar - Products and recommendations - Valcol Flex Gruesa

Mortar - Bagged mortar - Products and recommendations - Valcol Flex Gruesa

Product range: Cement-based adhesive

Valcol Flex Gruesa

High-performance adhesive for application in thick courses.

High-performance adhesive cement for interior and outdoor use; for laying medium-high absorbency ceramic tiles. Especially formulated for application in thick courses.

Scope of application
Application: indoor and outdoor use
Wall / PavementSubstrate typeTypeSizeAbsorbency
  • Interior walls.
  • Façades(3).
  • Brick wall.
  • Concrete blocks (with no need for mortar rendering).
  • Cement mortar base.
  • Tiles.
  • Enamel stoneware.
  • Porcelain stoneware.
  • Extruded stoneware.
  • Enamel mosaic.
  • Marble.
  • Natural stone.
Medium, large
≤40x40 cm(1)(3)
(or equivalent surface area)
  • Low, medium or high
  • Group I: E ≤ 3%
  • Group II: 3% ≤ E ≤ 10%
  • Group III: E ≥ 10
  • Interior or exterior pavement.
  • Heavily-trafficked pavement.
  • Mortar screed.
  • Concrete (with no need for mortar rendering).
  • Terrazzo(2).
  • Natural stone.
  • Tiles.
  • Enamel stoneware.
  • Porcelain stoneware.
  • Extruded stoneware.
  • Enamel mosaic.
  • Marble.
  • Natural stone.
Medium, large
≤50x50 cm(1)
(or equivalent surface area)
  • Low, medium or high
  • Group I: E ≤ 3%
  • Group II: 3% ≤ E ≤ 10%
  • Group III: E ≥ 10

(1) Apply adhesive to both tile and substrate for large sizes and/or weights of more than 40 kg/m2.
(2) First open the pores of the surface layer or glaze by chemical or mechanical means.
(3) Use mechanical anchors on exterior façades.

Supply conditions

25 kg bags protected by plastic sheet.


Grey and White.

Mixing instructions

Add approximately 6.5 litres of water per bag of VALCOL FLEX GRUESA (C2T). Mix by hand or with a slow electric mixer to obtain a smooth paste. Let stand for 5 minutes before using. Then mix again. VALCOL FLEX GRUESA (C2T) should be used within about 90 minutes of mixing.

Substrate preparation

The substrate must be flat, dry, solid, clean (without dust, surface grout, loose particles or any other material that impedes good adhesion: paint, concrete release agents, etc.). In the case of very porous concrete surfaces or very hot weather, dampen the substrate before application.

Ensure compatability between adhesive and substrate. It should be applied on cement mortar substrates. Do not apply on gypsum substrates (use VALCOL YESO instead). Check the product datasheets.

Tile preparation

The tile must be completely clean. Ensure that it is flat.


Mortar made from cement, graded aggregate and organic and inorganic admixtures which improve its workability, water retention, adhesion and anti-slumping properties.

Tipo C2T según norma UNE EN 12004
Initial adhesion strength (UNE EN 1348) ≥ 1 N/mm2 Water proportion 26% ± 1%
Tensile adhesion strength after water immersion (UNE EN 1348) ≥ 1 N/mm2 Apparent density (UNE EN 1015-6) 1,5 ± 0,2 kg/l
Adhesion strength after freeze-thaw cycle (UNE EN 1348) ≥ 1 N/mm2 Working temperature +5ºC a +35ºC
Adhesion strength after ageing (UNE EN 1348) ≥ 1 N/mm2 Grouting time ≥ 24h
Open time (UNE EN 1346) 20 min. Application thickness ≤ 15 mm
Slip (UNE EN 1308) ≤ 0,5 mm Approximate yield 14 kg/m2
Working time Aprox. 90 min.    
Instructions for application

Apply in a single thick layer (on the substrate) or a double layer (on substrate and tile) with a serrated trowel. For large and/or heavy tiles, always apply to both faces. Use mechanical anchors on exterior facades.

Do not exceed the product's open time. Accordingly, application is recommended in small sections, regularly checking the adhesive's stickiness and ensuring that no film forms on the surface. Re-trowel in the event of surface film formation.

Lay the tile and press firmly to flatten the grooves in the cement.

At all times respect structural, perimeter and intermediate joints as well as grout joints. The grout joints must be at least 1.5 mm in indoor applications and 5 mm in outdoor applications. Grout 24 hours after application using VALCOL JUNTA UNIVERSAL.

Do not use the product at an ambient temperature below 5ºC or above 35ºC.


VALCOL FLEX GRUESA (C2T) is certified by AENOR as conforming to the obligatory quality requirements under the UNE EN 12004 standard.

VALCOL adhesive cement is 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. When stored adequately, it may be used for up to 12 months from the date of 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.