// Products · Specified Materials

The materials
we specify.

Our default repair system is built around the Fosroc Renderoc range, the market-standard EN 1504 concrete-repair system in the UK. Below are the products we most commonly specify, why we choose them, and where each one fits in a repair.

Note. Product data below is summarised from Fosroc technical datasheets for reference only. Always refer to the current manufacturer data sheet for application. All Fosroc, Renderoc, Nitoprime, Nitomortar, Patchroc and Dekguard trademarks belong to Fosroc International Ltd.

// P01 · Fosroc

Structural Repair Mortar

Renderoc HB45

High-strength, fibre-reinforced hand-applied repair mortar

Illustration · Fosroc International Ltd

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A polymer-modified, fibre-reinforced, high-build cementitious mortar for reinstating reinforced concrete. Our default choice for columns, beams and soffits where an R4 structural repair is required.

// Specification

Standard: BS EN 1504-3 · Class R4
Compressive strength: > 45 MPa (50 MPa @ 28 days)
Bond strength (pull-off): > 2.0 MPa
Application thickness: 10 to 80 mm (vertical) · 10 to 70 mm (overhead) in a single layer
Application method: Hand-applied or wet-sprayed
Packaging: 25 kg bag · ~1.4 m² per bag at 10 mm

// When we use it

Reinstating spalled or broken-out concrete on structural elements
Overhead soffit repairs where a high-build vertical mortar is needed
Column and beam patch repairs following reinforcement treatment

// P02 · Fosroc

Reinforcement Primer

Nitoprime Zincrich Plus

Single-component zinc-rich epoxy primer for exposed reinforcement

Illustration · Fosroc International Ltd

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A single-pack zinc-rich epoxy primer applied to reinforcement after cleaning to SA 2½. Provides active galvanic protection and passivates the steel prior to reinstatement.

// Specification

Standard: BS EN 1504-7 · Method 11.1
Type: Single-component metallic zinc-rich epoxy
Recommended DFT: 40 microns per coat (100 microns wet)
Coverage: ~8 m² per litre
Touch-dry / overcoat: 1 hour / 2 hours @ 20 °C
Packaging: 800 mL and 1.9 L

// When we use it

Priming exposed reinforcement immediately after grit-blast cleaning
Every corrosion repair prior to reinstatement in a Renderoc mortar
Where a fire-safety-compliant reinforcement primer is required (LU Standard 1-085)

// P03 · Fosroc

Anti-Carbonation Coating

Dekguard S

Protective coating against CO₂, chlorides and moisture

Illustration · Fosroc International Ltd

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A protective coating applied to the whole element after repair. Provides a barrier to atmospheric CO₂ (arresting further carbonation) and to chloride ingress. Part of the Renderoc repair system.

// Specification

Standard: BS EN 1504-2 · Principles 1.3, 2.2, 8.2
Protects against: CO₂, chloride ions, oxygen, water
Substrates: New and repaired reinforced concrete
Finish: Matt · pigmented

// When we use it

After completing carbonation-driven repairs, applied to the whole element
Marine and coastal structures at risk of further chloride ingress
Extending the service life of car park decks and façades post-repair

// P04 · Fosroc

Crack-Bridging Coating

Dekguard Elastic

Elastomeric coating that accommodates future movement

Illustration · Fosroc International Ltd

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A crack-bridging elastomeric acrylic coating for elements where further movement or hairline cracking is expected. Common on ASR-affected structures being monitored, and on façades with a history of thermal cracking.

// Specification

Type: Elastomeric acrylic protective coating
Elongation: High, bridges dynamic cracks
Colour: Available in a range of pigmented finishes
Use with: Nitoprime DG primer (silane-siloxane)

// When we use it

ASR-affected structures under expansion monitoring
Façades and elements with ongoing thermal or shrinkage cracking
Where a decorative, colour-matched finish is required over the repair

// P05 · Fosroc

Structural Epoxy Mortar

Nitomortar S

High-strength epoxy repair for severe or thin-section reinstatement

Illustration · Fosroc International Ltd

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A three-component epoxy resin mortar for high-strength, chemically resistant reinstatement. Selected where a cementitious repair is inappropriate, thin sections, harsh chemical exposure, or where early strength is critical.

// Specification

Type: Solvent-free epoxy resin mortar
Compressive strength: Very high, > 70 MPa typical
Chemical resistance: Excellent (acids, alkalis, hydrocarbons)
Application: Trowel-applied, thin to moderate sections

// When we use it

Chemical process areas where acid/alkali exposure is expected
Thin-section repairs where a cementitious mortar would fail
Post-fire repairs where high early strength is required

// P06 · Fosroc

Flowable Micro-Concrete

Renderoc RG (LA)

Non-shrink micro-concrete for congested reinforcement

Illustration · Fosroc International Ltd

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A high-strength, free-flowing micro-concrete for reinstating structural elements where placement space is restricted or the reinforcement is congested. Poured into formwork rather than trowelled.

// Specification

Standard: BS EN 1504-3 · Class R4
Type: Cementitious, non-shrink, flowable micro-concrete
Application: Poured into formwork; ideal for full-section reinstatement
Best for: Column encasement, deep pockets, congested rebar

// When we use it

Full-section column or beam reinstatement
Where hand-applied mortar cannot reach behind reinforcement
Larger-volume placements requiring flow around dense bar arrangements

// Specification support

Need a spec for your project?

We'll write a project-specific repair specification citing appropriate Fosroc products, method statements and BS EN 1504 references. Ideal for consulting engineers preparing tender documents.

Request a specification

The materialswe specify.

Renderoc HB45

Nitoprime Zincrich Plus

Dekguard S

Dekguard Elastic

Nitomortar S

Renderoc RG (LA)

Need a spec for your project?

The materials
we specify.