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Beyem Proof Flexible

Beyem Proof Flexible

Two-component, cement-based, polymer modified flexible membrane for concrete surface protection and waterproofing.

About this product

BEYEM PROOF FLEXIBLE is a two-component, cement based, polymer modified flexible membrane for concrete surface protection and waterproofing. Formulated with special cements, selected aggregates, organic additives and resins to improve adhesion and waterproofing. Specially suitable for  containing water. Approved for potable water contact. Specially suitable for applications subject to small movements, when flexibility is a must. 

  • Modified polymer mortar (PCC).
  • Excellent  adhesion.
  • High flexibility.
  • Waterproof up to 7,5 atm of pressure positive lift.
  • Suitable for spray machines and manual applications (by brush or thin trowel).
  • Waterproof and permeable to water vapour. Fast hardening without cracking.
  • Both internal and external use.
  • Weather resistant.
  • High protection against  the effects of de-icing salts and freeze-thaw attack.

Concrete surface protection according to the MC and RI principles: Moisture Control (MC) by surface coating and Increasing Resistivity (IR) by limiting moisture content. Waterproofing of foundations, basement walls, cellars, concrete slabs, walls, tanks, swimming pools, cellars, planters, lift pits, balconies, terraces, bathrooms, showers… Protection of buildings against water damage. Waterproofing of substrates that can undergo small movements or with little cracks (BEYEM PROOF FLEXIBLE absorbs micro-cracks up to 0.8 mm with thicknesses of 3 mm).


BEYEM PROOF  FLEXIBLE  is suitable for:

  • Concrete 
  • Cement based substrates
  • Rendering and plastering mortar
  • BEYEM’s concrete repair mortars 
Preparation of substrates

Concrete must be free from dust, loose material, surface contamination and materials which reduce  bond or prevent suction or wetting  by repair materials. Where necessary, concrete  must be cleaned by sandblasting, high pressure water jetting or other approved mechanical methods that do not cause vibration or impact, to leave a clean and keyed surface.  Absorbent substrates should be previously wetted until they are saturated, preventing waterlogging, and applying the mortar  once the surface has a matt appearance. Smooth, slightly absorbent or very damaged substrates should be treated to obtain a surface with minimum guarantees of roughness and tensile strength. For more information regarding substrate preparation, refer to the recommendations provided in EN 1504-10.

Instructions for use

BEYEM PROOF FLEXIBLE is presented in adequate proportions of its two components. Pour the component B (liquid) into a clean container and add the component A (powder) little by little. Mix until a homogeneous and lump-free paste is obtained.  Let the mix stand for 5 minutes before application.

Apply a minimum of 2 layers  by spray render or by hand (using a trowel o brush) pressing the material  to ensure adhesion. The second layer (and successive ones) can be applied in the same way, once the first layer has dried (from 2 to 12 hours, depending on the environmental conditions). If the final thickness has to exceed 4 mm, 3 layers of product should be applied. It is advisable to apply the successive layers in perpendicular directions and avoid the accumulation of more material than is necessary in the corners or joints between vertical and horizontal  elements.

Cautions and recommendations
  • Do not apply below 8ºC or above 30ºC.
  • Do not apply when there is risk of frost, rain, strong wind or direct sunlight.
  • Do not vary the mixing ratio of the components.
  • Critical areas  as fillen joints between vertical and horizontal  elements must be treated with a dry mortar to minimize the application angle of BEYEM PROOF FLEXIBLE.
  • If the surfaces waterproofed with BEYEM PROOF FLEXIBLE can suffer strong mechanical aggression, they should be covered with some protective element such as ceramic tiles, etc.)
  • Apply preferably on the positive side, that is, on the one that receives the water pressure.
  • Applied on negative side, there are risk of detachment if  water pressure is higher than adhesion of material.
  • Protect the mortar applied of early dehydration, using suitable  curing methods. The curing operation in humid environment is essential for at least 24 hours after application.
  • Do not apply on gypsum, metal or wood.
  • Mix only sufficient material that can be applied  using available labour and equipment.
  • BEYEM PROOF FLEXIBLE must cure for a minimum of  3-7 days before receiving mechanical loads.
  • Water pressure loadable after 7-14 days.
  • Suitable for potable  water  contact after 28 days and two washes. 
Technical data

Product identity. Properties of mixture and application data

Appearance  and color


     Component A

Grey powder

     Component B

White liquid


0-800 µm

Density of the mix

≈ 1660 Kg/m3

Maximum  application thickness

2-5 mm



              2 mm thickness (without water pressure)

≈ 3 Kg/m2

              4 mm thickness (with water pressure)

≈ 6 Kg/m2

Tariff code component A


Tariff code component B


Final performances



Surface protection  mortar for  concrete EN 1504-2

Bond strength

≥ 1,0 MPa

Capillary absorption and permeability to water

W < 0,1 kg/m2h1/2

Water vapour permeability

Class l: SD < 5 m

Reaction to fire

Euroclass A1


BEYEM PROOF FLEXIBLE is packed  in pre-measured batches of 32 kg (24 kg plastic lined paper bags – Component A-  and 8,0 kg plastic bottle – Component B-). Boxes of three units of 5 Kg (Component A) and three plastic  bottles  of 1.7 l (Component B).

Storage: when stored unopened in a cool dry place, shelf life is 12 months from date of manufacture.

Cleaning tools

Tools can be cleaned easily with water before the product hardens. Hardened product can be removed only mechanically.

Project specification

Surface protection of concrete and waterproofing must be carried out with  two-component, cement based, polymer modified flexible membrane compliant with EN 1504-2 and according to Principle 2, method 2.2 and  Principle 8, method 8.2 of  EN 1504-9, such as Beyem Proof Flexible , manufactured by Rodacal Beyem Company. Coverage will be  ≈ 1,5 kg / m2 per mm of thickness.

Health and Safety

For further and complete information about the safe use of our product please refer to our latest version of the Safety Data Sheet, which is available upon request.

Disposal of the product and packaging must be in accordance with current legislation. This is responsibility of the final product user.


Technical Data Sheet

Safety Data Sheet Component A

Ficha de Seguridad Componente B

Declaration of Performance

Certificate of Factory Production Control

Certificate of Quality Management System ISO 9001

Certificate of R+D+i Management System UNE 166002

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