Sika Sikafloor-82 EpoCem
Three-part epoxy-cement self-smoothing screed that lets resin floors be laid over green or damp concrete, without waiting months for the slab to dry.
What is it?
A three-part, epoxy-modified cementitious mortar that self-smooths into a 3-7 mm screed and doubles as a temporary moisture barrier under resin flooring.
Where is it used?
Interior industrial and commercial slabs where a resin floor has to go down over new, green or persistently damp concrete.
Why use it?
It blocks rising moisture that would otherwise cause osmotic blistering, so epoxy, PU or PMMA finishes can be installed weeks earlier than a fully dried slab allows.
How is it applied?
Prime, pour the pre-batched A+B+C mix, spread with a trowel and back-roll with a spiked roller to a 3-7 mm layer; overcoat with resin after roughly 24 hours.
About Sika Sikafloor-82 EpoCem
Sikafloor-82 EpoCem sits in an unusual niche: it is neither a pure cement screed nor a pure epoxy system, but a hybrid that borrows the best of both. The powder (Part C) behaves like a fast-strength cementitious mortar, while the epoxy resin and hardener (Parts A and B) give it density, chemical resistance and, critically, the ability to breathe out water vapour while staying impermeable to liquid water. That combination is what makes it a temporary moisture barrier. On Indian sites, where programmes rarely allow a new slab the two-to-three months it needs to dry to the 4 percent surface moisture most resin floors demand, this product buys back that time.
For engineers and applicators, the practical value is sequencing. A warehouse or plant slab can be cast, given a few days for early shrinkage, mechanically prepared and then screeded with Sikafloor-82 EpoCem while it is still green or damp. Once the screed is tack-free, a vapour-permeable resin finish from the Sikafloor range goes on top and the floor moves forward instead of stalling. Space Arc Engineering supplies the product as authorised Sika distributors across Delhi NCR and Pan-India, and the notes below draw directly on Sika’s own India technical data sheet so specifiers are working from verified figures, not marketing rounding.
The technical insight
The mechanism turns on vapour permeability paired with liquid impermeability. Fresh and damp concrete continuously drives water vapour upward; a conventional epoxy laid straight onto it traps that vapour at the interface, and the resulting osmotic pressure lifts the coating in blisters. Sikafloor-82 EpoCem’s cementitious matrix is open enough to let water vapour pass through and escape, yet dense enough to stop liquid water and to carry a resin topping. Because its thermal expansion is close to that of concrete and it bonds well to green or hardened damp substrates, it moves with the slab rather than debonding. The epoxy modification is what lifts early and final strength (compressive strength reaches at least 15 N/mm2 at one day and 45 N/mm2 at 28 days) and delivers the chemical, oil and water resistance a plain cement screed could not. Note that the barrier effect is temporary: Sika treats it as time-limited, so if more than five days pass before overcoating, the surface moisture must be re-checked.
Where it is used
- Temporary moisture barrier under epoxy, polyurethane and PMMA resin floors on green or damp concrete
- Self-smoothing wearing screed where appearance is not critical
- Levelling screed beneath Sikafloor resin systems and floor coverings
- Patching and re-profiling screed for horizontal concrete repairs
- Fast-tracking resin flooring on newly cast industrial slabs before full drying
- Refurbishment of damp aged concrete floors suffering rising moisture
- Warehouse, logistics and production-area slabs on tight construction programmes
- Interior commercial floors where osmotic blistering risk must be eliminated
Key advantages
- Overcoatable with resin floors after about 24 hours at +20 C and 75 percent r.h.
- Prevents osmotic blistering of resin coatings applied over damp substrates
- Vapour permeable yet impermeable to liquids, so the slab can keep drying
- Excellent early and final mechanical strength for a cementitious screed
- Bonds well to both green and hardened damp concrete
- Thermal expansion close to concrete, reducing debonding and cracking risk
- Good chemical, oil and water resistance; will not corrode reinforcement
- Supplied pre-batched in ready-to-mix units, reducing on-site dosing error
Limitations & considerations
- Interior use only; not intended for external applications
- Restricted to experienced professional applicators, not general labour
- The moisture-barrier effect is temporary and time-limited, not permanent
- Surface texture makes it unsuitable as a bare wearing layer where staining matters; a seal coat is advised
- Short working window, with pot life around 25 minutes at +20 C and only about 12 minutes at +30 C
- No water may be added to the mix, and curing compounds cannot be used
Selection & best practice
Success is mostly won at the substrate stage. Concrete must be structurally sound with a minimum compressive strength of 25 N/mm2 and tensile strength of 1.5 N/mm2, mechanically prepared by blasting or scarifying to remove laitance, with blow holes fully exposed and the surface vacuumed clean. Prime with Sikafloor-80 EpoCem Primer, then work within the batch: mix Part A, add Part B and mix two minutes, then gradually add Part C and mix a further three minutes with an electric double-paddle mixer, never a free-fall mixer, and avoid over-mixing to limit air entrainment. Respect the pot life, which shortens sharply as temperature rises, and keep product, air and substrate between +8 C and +30 C at 20-80 percent relative humidity. Pour, trowel evenly to 3-7 mm and back-roll in two directions at right angles with a spiked roller, maintaining a wet edge. Protect fresh screed from direct sun, draughts and water for at least 24 hours, and allow surface moisture to fall below 4 percent before applying vapour-tight coatings.
Specifications
| Chemical base | Epoxy-modified cementitious mortar (three-part) |
| Layer thickness | 3 mm minimum to 7 mm maximum (min 3 mm as TMB) |
| Mixing ratio A:B:C by weight | 1 : 2.5 : 22 (at +12 C to +25 C) |
| Consumption (screed) | ~2.25 kg/m2 per mm; ~6.75 kg/m2 at 3 mm |
| Compressive strength | >=15 N/mm2 at 1 day; >=45 N/mm2 at 28 days (EN 13892-2) |
| Flexural strength | >=2 N/mm2 at 1 day; >=10 N/mm2 at 28 days (EN 13892-2) |
| Pot life | ~50 min at +10 C; ~25 min at +20 C; ~12 min at +30 C |
| Packaging | Pre-batched 26.8 kg ready-to-mix unit (A 1.05 kg + B 2.63 kg + C 23.12 kg) |
| Overcoating / curing | Vapour-permeable coats when tack-free; vapour-tight coats after ~1 day at +20 C once moisture <4% |
Industry use cases
Warehousing & Logistics
Screeds green warehouse slabs so PU or epoxy floors can be laid on programme, blocking rising moisture that would blister the finish.
Manufacturing & Production
Creates a sound, moisture-controlled base for chemical- and oil-resistant resin floors in plants where the slab cannot be given months to dry.
Concrete Repair & Refurbishment
Patches and re-profiles damp aged floors with rising moisture, restoring level before a new resin system goes down.
Commercial Fit-outs
Levels and moisture-proofs interior concrete under resin or floor coverings in retail and institutional projects on tight timelines.
Cold & Damp Environments
Suits interior areas over damp concrete where osmotic blistering risk is high and a breathable barrier is needed under the finish.
Frequently asked questions
Can I apply Sikafloor-82 EpoCem on green or freshly cast concrete?
How soon can I overcoat it with an epoxy or PU floor?
Is the moisture barrier permanent?
What thickness should I apply, and how much material will I need?
Can it be used as the final wearing surface?
Can it be used outdoors?
How we position Sika Sikafloor-82 EpoCem
Within the Sika system this product rarely works alone: pair it with Sikafloor-80 EpoCem Primer underneath and a Sikafloor or Sikagard resin topcoat above, and use SikaTop Armatec-110 EpoCem as the bonding primer where a wet-on-wet interlayer bond is called for. For thinner 1.5-3 mm work, its sibling Sikafloor-81 EpoCem is the natural alternative. Where the requirement is purely deep levelling rather than moisture control, we can cross-supply from our Fosroc range. Space Arc Engineering carries all of these lines, so specifiers can source a complete, compatible floor build-up from one distributor.
Fosroc Nitoflor Levelcrete — Choose Levelcrete when the job is deep re-profiling of an uneven floor (12-80 mm) rather than moisture control, since it is a plain cementitious leveller without the epoxy-modified temporary-moisture-barrier function of Sikafloor-82 EpoCem.
Related Industrial Flooring products
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.