webercem mortar CP

webercem mortar

Pre-batched, single-component mortar needing only mixing with water to produce a render with low resistivity, suitable for patch repairs on concrete structures where cathodic protection systems are to be used.

Conforms to BS EN 1504-3 as a Class R4 repair product.


  • 25kg

About this product

  • Levelling rough surfaces of concrete
  • Rendering and building up thicknesses over low cover to steel reinforcement
  • Patch repairs to concrete bridge abutments, parapets, beams and crossheads
  • Filling-in of core holes, small voids and shutter tie holes
  • For tunnels, car parks, bridges, and marine structures such as jetties where cathodic protection is to be used as a preventative treatment
  • For vertical and horizontal surfaces
  • Suitable for external and internal surfaces

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Features and benefits

  • Good bond to concrete - damp or wet
  • Durable - does not crack or craze when applied and properly cured
  • Easy to use - can be mixed by hand or mechanically
  • Easy to apply - can be applied easily with a spray pump or by trowel without slumping
  • Easy to finish - good smooth finish obtainable with a float or sponge. Provides a cohesive and level surface suitable for overcoating. 
  • Complies with Highways Agency ClassM mortar specification - contains more than 400 kg/m3 of ordinary Portland cement to BS 12, the maximum size of aggregate does not exceed 2 mm, the total chloride ion content is less than 0·1% of cement, the resistivity at 28 days saturation is between 5 kΩcm and 15 kΩcm.

Things to consider

  • Limited to 10 mm thickness per layer for rendering
  • Do not use where there is a large variation in thickness
  • Do not use where the substrates are subject to movement or are cracked
  • Do not use on heavily trafficked floors
  • Do not apply if frost is forecast within 24 hours of use
  • Do not apply in temperatures below 5°C or above 30°C
  • When stored unopened in a dry place at temperatures above 5°C, shelf life is 6 months from date of manufacture

Technical & Safety Data Sheets and Certification

This product can be used as part of these projects

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