About Fosroc Dekguard ACE

Fosroc Dekguard ACE belongs to the Dekguard family of surface-protection coatings, Fosroc’s long-established range for protecting atmospherically exposed reinforced concrete. The “ACE” variant is positioned as a high-performance, environmentally friendly, one-part anti-carbonation coating that is water based, which makes it well suited to enclosed and occupied spaces such as basement car parks where solvent-based products are harder to apply safely.

Carbonation is the slow reaction between atmospheric carbon dioxide and the alkaline calcium hydroxide in concrete. As the carbonation front advances inward and reaches the reinforcement, the passivating alkaline environment that protects the steel breaks down, and corrosion begins. In India’s climate, this is accelerated by high humidity, urban pollution, coastal salt and freeze-free but thermally cycling conditions. Dekguard ACE works by laying down a continuous, low-permeability film that dramatically increases the resistance the carbon dioxide must overcome to reach the steel, effectively pushing the carbonation front outward and buying decades of additional service life.

Unlike a simple decorative paint, Dekguard ACE is a specified protective system. It is applied over a penetrating primer and built up to a controlled dry film thickness so that its barrier performance is engineered rather than incidental. At the same time it remains breathable, allowing water vapour already inside the concrete to escape rather than building up behind the film and causing blistering or delamination. It is also pigmented and available as a decorative finish, so a single product delivers both engineering protection and an architectural facade appearance, which is attractive to consultants and developers who want to consolidate scope.

For specifiers, the key idea is that Dekguard ACE is a “Principle 1 / Principle 2” surface-protection product in BS EN 1504-2 terms, controlling ingress and providing physical resistance, and it should be selected and detailed against project-specific exposure and a current local Technical Data Sheet rather than applied as a generic coat of paint.

The technical insight

The performance that matters in an anti-carbonation coating is its carbon dioxide diffusion resistance, normally expressed as an equivalent thickness of static air (the higher the metres of equivalent air, the better the CO2 barrier), paired with a low water-vapour diffusion resistance (low Sd) so the structure can still breathe. Across the Dekguard surface-protection family these two properties are deliberately balanced: published Fosroc data sheets for sibling products show CO2 equivalent-air values from roughly 100 to over 240 metres alongside water-vapour Sd values well under 5 metres, which is the Class 1 “breathable” band under EN ISO 7783. Dekguard ACE, as a water-based film-forming coating built to its specified dry film thickness, is engineered to sit in this same high-CO2-resistance, low-vapour-resistance window. The practical consequence is that achieving the specified total dry film thickness in two coats is not cosmetic, it is what delivers the rated CO2 barrier, so coverage rate and film build must be controlled on site and verified, not left to the applicator’s eye.

Where it is used

• Anti-carbonation protective coating for external RCC facades, columns, beams and soffits of commercial and residential buildings
• Internal and external coating of basement and multi-storey car parks, where its water base suits enclosed, ventilated spaces
• Protective and decorative coating for bridge piers, abutments, parapets and other highway concrete
• Surface protection of infrastructure such as flyovers, metro viaducts, water-retaining structure exteriors and industrial RCC
• Refurbishment of carbonation-affected concrete as the final protective layer over a Renderoc-type patch-repair system
• Decorative finishing of concrete and masonry where both architectural colour and durability protection are required

Key advantages

• Slows carbonation and extends the service life of reinforced concrete by forming a high-resistance barrier to carbon dioxide
• Resists chloride and sulphate ions plus a wide range of chemicals, protecting embedded steel from corrosion
• Breathable and water-vapour permeable, so trapped moisture can escape and the coating resists blistering and delamination
• Water based and one part, low odour and suitable for enclosed and occupied areas such as basement car parks
• Good resistance to weathering, UV and ageing, retaining its protective and decorative properties over the long term
• Decorative pigmented finish available in a range of colours, combining engineering protection with facade aesthetics
• Easy site application by brush, roller or spray with simple water clean-up of tools and equipment

Limitations & considerations

• Not a crack-bridging elastomeric coating; where active or thermal cracking up to several millimetres is expected, an elastomeric grade such as Dekguard Elastic or E2000 is more appropriate
• Not designed for permanently submerged, ponded-water or below-grade tanking duty; specify a dedicated waterproofing or immersion-grade system instead
• Not a trafficable deck coating; vehicle and pedestrian wearing surfaces require a car-park deck system, not Dekguard ACE
• Barrier performance depends on achieving the specified dry film thickness in the correct number of coats, so film build must be controlled and checked on site
• Substrate must be sound, clean, dry and properly primed; application over contaminated, friable or unprimed concrete will compromise adhesion and protection
• Application is weather and temperature sensitive and should not proceed in high humidity, on damp substrates, or when rain or low temperatures are imminent
• Exact published values and colour range can vary by country and revision, so the current local Fosroc TDS must be confirmed before specification

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Dekguard ACE

Within Fosroc’s own range, Dekguard ACE is the breathable, water-based anti-carbonation member of the Dekguard surface-protection family. It pairs naturally with Fosroc’s Renderoc concrete-repair mortars and Nitoprime/Dekguard primers as the protective topcoat in a complete repair-and-protect specification. Where the substrate is sound and the requirement is a breathable anti-carbonation facade or car-park coating, ACE is the natural choice; where active or thermal cracking is expected, the elastomeric Dekguard Elastic or Dekguard E2000 are the better-matched siblings, and where a solvent-borne high-barrier aliphatic finish is preferred for exposed marine structures, Dekguard S is the alternative. Against competitor systems commonly specified in India, Dekguard ACE competes with Sika’s anti-carbonation coatings such as Sikagard-550 W Elastic and Sikagard-680 S, with MBS (MYK Saint-Gobain) anti-carbonation and protective coatings, with Dr. Fixit’s protective and anti-carbonation range from Pidilite, and with STP/Bostik protective coatings. Selection between these should be driven by the project’s exposure class, required CO2 and water-vapour values, crack-bridging needs and applicator familiarity, and verified against each manufacturer’s current Technical Data Sheet rather than on brand alone. Space Arc Engineering, as an authorised Fosroc distributor and applicator, can advise on the right Dekguard grade and supply it with application support across Delhi NCR and Pan-India.

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