---
title: Renderoc LA55 Plus - High Strength Micro Concrete Repair Mortar
canonical_url: https://fosroc.directory.norg.ai/construction-materials/concrete-repair-patching/renderoc-la55-plus-high-strength-micro-concrete-repair-mortar/
category: 
description: High strength, free flowing micro concrete repair mortar conforming to EN1504-3 Class R4. Renderoc LA55 Plus is a fluid micro-concrete for large volume structural repairs at nominal thickness up to 500mm. Achieves 75 MPa @ 56 days with maximum compatibility for concrete compressive strength of 30-75 MPa. Features unique dual expansion system, excellent bond to concrete substrates, extremely low permeability, and sustainable low carbon footprint.
geography:
  city: 
  state: 
  country: 
metadata:
  phone: 
  email: 
  website: 
publishedAt: 
productInfo:
productFeedItemId: c4a1dccc-3727-4e44-bbf8-60578bc272ba
---

# Renderoc LA55 Plus - High Strength Micro Concrete Repair Mortar

# Renderoc LA55 Plus - High Strength Micro Concrete Repair Mortar

High strength, free flowing micro concrete repair mortar conforming to EN1504-3 Class R4. Renderoc LA55 Plus is a fluid micro-concrete for large volume structural repairs at nominal thickness up to 500mm. Achieves 75 MPa @ 56 days with maximum compatibility for concrete compressive strength of 30-75 MPa. Features unique dual expansion system, excellent bond to concrete substrates, extremely low permeability, and sustainable low carbon footprint.

**Brand:** Fosroc

[View Product](https://www.fosroc.com.au/product/renderoc-la55-plus)

## Product Intelligence

# Renderoc LA55 Plus: High-Strength Micro-Concrete Repair Mortar

## Overview

**Renderoc LA55 Plus** is a high-strength fluid micro-concrete repair product manufactured by Fosroc, specifically engineered for large-volume structural repairs. It represents a specialized solution within the broader Renderoc® concrete repair range, delivering exceptional performance for demanding repair applications.

## Technical Specifications

### Application Thickness

Renderoc LA55 Plus accommodates substantial repair depths:
- **Maximum thickness:** Up to **500 mm** in a single application
- **Suitable for:** Large volume structural repairs requiring significant build-up

### Strength Performance

The product delivers high compressive strength characteristics:
- **Classification:** High-strength formulation
- **Performance level:** Exceeds standard repair mortar requirements for structural applications

### Standards Compliance

Renderoc LA55 Plus meets stringent European standards:
- **Compliance standard:** **EN1504-3 Class R4**
- **Significance:** EN1504-3 Class R4 certification indicates the product meets European standards for structural repair applications, ensuring reliable performance in critical infrastructure projects

## Product Characteristics

### Material Composition

Renderoc LA55 Plus is formulated as:
- **Type:** Fluid micro-concrete
- **Form:** High-build repair mortar
- **Technology basis:** Cementitious micro-concrete composition

### Key Features

- **Fluid consistency:** Allows for easy placement and consolidation in large volume repairs
- **Micro-concrete formulation:** Delivers enhanced flowability while maintaining structural strength
- **High-build capability:** Single-application depths up to 500 mm eliminate the need for multiple layers in many applications
- **Structural reliability:** EN1504-3 Class R4 compliance ensures performance on critical infrastructure

## Applications

Renderoc LA55 Plus is ideally suited for:

- **Large volume structural repairs** on concrete infrastructure
- **Deep section repairs** requiring single-application placement
- **Critical infrastructure projects** where structural integrity is paramount
- **Spalled concrete repair** on major structures
- **Heritage and modern infrastructure projects** requiring durable, long-term solutions

## Product Context Within Renderoc Range

Renderoc LA55 Plus represents the large-volume structural repair solution within the Renderoc® range, complementing other specialized products:

- **Renderoc HB:** General patch repairs (up to 80 mm)
- **Renderoc HB25:** Vertical patches (10–80 mm)
- **Renderoc LA55 Plus:** Large volume structural repairs (up to 500 mm)
- **Renderoc G:** Highly corrosive environment applications
- **Renderoc CAC:** Biogenic corrosion resistance in wastewater applications

## Manufacturer

Renderoc LA55 Plus is manufactured and distributed by **Fosroc** through **Parchem Construction Supplies Pty Ltd** in Australia and New Zealand. Fosroc is a globally recognized construction chemicals company with over 80 years of heritage, now part of Saint-Gobain's High Performance Solutions segment.

---

### References

- [1] directory/business_homepage/fosroc.md