Fosroc Nitoproof 15
Cold-applied, water-based rubber-reinforced bitumen emulsion that dries to a tough, flexible film and acts as a barrier to water and water-vapour transmission.
What is it?
A brown/black, water-based rubber-reinforced bitumen emulsion from Fosroc that brush-, broom- or squeegee-applies cold and dries to a tough, flexible, waterproof film.
Where is it used?
Below-ground foundations, plinth beams, retaining walls, masonry and concrete substrates, and as a damp-proof / vapour-barrier membrane and protective coating on buried structures.
Why use it?
It is solvent-free, easy to cold-apply without heat or torching, economical, flexible, and resists chloride- and sulphate-laden ground water common across Indian soils.
How is it applied?
Prepare a sound, clean, grease-free substrate; prime dusty surfaces with a diluted coat; then apply two coats by brush/broom/squeegee, allowing the first to dry before recoating, and blind with sand where a screed or backfill follows.
About Fosroc Nitoproof 15
Fosroc Nitoproof 15 is a cold-applied waterproofing and damp-proofing coating built around a rubber-reinforced bitumen base that is emulsified in water. In plain terms, it is a thick, paint-like liquid that you brush, broom or squeegee onto concrete and masonry; as the water carrier evaporates, the rubberised bitumen coalesces into a continuous, tough and flexible black film that stops liquid water and slows water-vapour movement through the structure.\n\nThe product sits in Fosroc’s well-established Nitoproof family of bituminous coatings. The lower-numbered Nitoproof grades (such as Nitoproof 10) are straight bitumen emulsions used as damp-proof membranes and curing aids, while Nitoproof 15 is specifically the rubber-reinforced version of that emulsion. The added rubber/elastomeric content is what gives the cured film its extra toughness and a degree of flexibility, so the coating can accommodate minor substrate movement and surface irregularity better than a plain bitumen emulsion. Being water-based, it carries no solvent, has no flash-point hazard during application, is low-odour, and cleans off tools with water while still wet.\n\nFor an Indian project context, Nitoproof 15 is positioned as a workhorse below-ground protective and damp-proofing coat rather than an exposed, decorative or trafficable membrane. Typical roles include coating the external faces of foundations, footings, plinths, retaining walls and below-grade masonry to keep rising damp and soil moisture out of the structure, and protecting buried concrete from aggressive ground water. Because it is rubber-reinforced bitumen, it is dark in colour and intended to be concealed behind backfill, screeds, protection boards or finishes rather than left as a final visible surface. Space Arc Engineering supplies Nitoproof 15 as part of the full Fosroc waterproofing range to contractors, applicators, builders and project sites across Delhi NCR and on a pan-India basis, alongside complementary Fosroc systems for joints, screeds and surface waterproofing. Always confirm the exact coverage, coat count, drying times and pack sizes against the current Fosroc Technical Data Sheet (TDS) for your region before specifying or ordering, as Fosroc revises datasheets periodically and figures can vary by market.
The technical insight
The performance of Nitoproof 15 comes from its chemistry: it is a bitumen-in-water emulsion that has been reinforced with rubber/elastomeric content. During application the system is fluid because the bitumen is dispersed as fine droplets in water; once applied, the water evaporates and the bitumen droplets coalesce, while the rubber phase imparts toughness and flexibility to the resulting film. This break (curing by evaporation, not by chemical reaction or heat) is why the product must be applied to a surface that can lose water and why low temperatures and high humidity slow drying. It also means application is sensitive to rain before the film has fully formed.\n\nBecause it is the rubber-reinforced grade, it is closer in behaviour to a flexible damp-proof coating than a rigid one. For comparison, the straight-bitumen sibling Nitoproof 10 is documented as roughly 60% bitumen content, applied at about 2 to 5 m2 per litre depending on substrate, with a minimum of about 2 hours between coats, supplied in 20 and 200 litre drums, and resistant to potable, sea and ground water. Nitoproof 15 should be expected to behave in the same broad envelope as a water-based bituminous emulsion, with the practical difference that the rubber reinforcement targets a tougher, more flexible film. Treat those sibling figures as indicative only — the exact bitumen/rubber content, coverage, build thickness, recoat and drying times, and pack sizes for Nitoproof 15 must be read off the current Fosroc Nitoproof 15 TDS for your region, not assumed from a related grade.
Where it is used
- Damp-proof membrane / vapour barrier on concrete and masonry substrates
- External protective coating to below-ground foundations, footings and pile caps
- Tanking-grade protective coat on retaining walls and basement walls before backfill
- Plinth protection and rising-damp control at plinth beams and DPC level
- Protection of buried concrete against chloride- and sulphate-bearing ground water
- Backing coat beneath screeds (sand-blinded) and behind protection boards
- General waterproof/damp-proof coating on brickwork and blockwork below grade
Key advantages
- Cold-applied — no torch, no heating, safer and faster on busy Indian sites
- Water-based and solvent-free — low odour, no flash-point hazard, easier handling
- Dries to a tough yet flexible film thanks to rubber reinforcement
- Bonds to a wide range of substrates including concrete and masonry
- Resists chloride and sulphate ions present in aggressive ground water
- Economical, high-coverage workhorse coating for below-ground areas
- Easy clean-up — tools wash off with water while the coating is still wet
- Backed by Fosroc’s pan-India technical support and Space Arc’s local supply
Limitations & considerations
- Not a UV-stable or decorative finish — must be concealed, not left exposed long-term
- Dark brown/black only; intended to be buried, screeded or boarded over
- Cures by water evaporation, so cold, damp or rainy conditions slow or disrupt film formation
- Vulnerable to rain washout before the film has fully formed; protect freshly applied coats
- Not a torch-on sheet or high-build trafficable membrane — limited standalone build per coat
- Bituminous material — observe skin/eye protection per the SDS during application
- Requires sound, clean, grease-free, suitably prepared substrate and priming of dusty surfaces
- Exact verified coverage/thickness/recoat data must be taken from the current regional TDS
Selection & best practice
Start with a sound, clean, dry-to-touch substrate free of oil, grease, laitance and loose material; degrease contaminated areas and make good honeycombing or cracks first. Prime dusty or porous surfaces with a coat of Nitoproof 15 thinned with clean water and let it dry, as is standard practice for Fosroc bitumen emulsions. Apply at least two full coats by brush, broom or squeegee, working the first coat well into the surface and allowing it to dry before the next so each layer forms a continuous pinhole-free film; lap and reinforce internal corners and construction joints. Where a screed or backfill will follow, blind the final coat with clean, dry, sharp sand while it is still tacky and brush off the excess once dry to key the next layer, and use protection board against backfill to avoid mechanical damage. Avoid application in rain or when rain is imminent, on frozen or very cold substrates, or in conditions that prevent the water from evaporating. Clean tools with water immediately after use. Crucially, confirm the precise coverage rate, number of coats, wet/dry film thickness, drying and recoat times, and pack sizes against the latest Fosroc Nitoproof 15 Technical Data Sheet for your region before finalising the BOQ — Space Arc can supply the current TDS on request.
Specifications
| Product type | Rubber-reinforced bitumen emulsion, cold-applied waterproof/damp-proof coating |
| Base chemistry | Bitumen reinforced with rubber, emulsified in water (water-based, solvent-free) |
| Colour / finish | Brown/black liquid drying to a tough, flexible black film |
| Primary function | Barrier to water and water-vapour transmission; below-ground protective coating |
| Application method | Cold-applied by brush, broom or squeegee (no heat/torch) |
| Coats | Typically two coats; confirm against current Fosroc TDS for the region |
| Surface preparation | Sound, clean, grease-free substrate; prime dusty surfaces with a water-diluted coat |
| Substrates | Concrete and masonry (foundations, retaining/basement walls, plinths, blockwork) |
| Ground-water resistance | Resists chloride and sulphate ions present in ground water |
| Cleaning | Tools cleaned with water while the coating is still wet |
| Coverage / pack size | Per current Fosroc Nitoproof 15 TDS (verify before ordering; family grades supplied in 20 & 200 L drums) |
Industry use cases
Residential & commercial buildings
Damp-proofing of foundations, plinths and below-DPC masonry to stop rising damp and soil moisture entering the structure.
Basements & retaining structures
Protective/tanking coat on external faces of basement and retaining walls before backfill, with protection board against mechanical damage.
Infrastructure & buried concrete
Protection of footings, pile caps and buried concrete elements against chloride- and sulphate-bearing ground water.
Industrial & warehouse slabs
Vapour-barrier / damp-proof membrane beneath screeds and floor build-ups, sand-blinded to key the following layer.
Repair & refurbishment
Re-coating and damp-proofing of below-ground masonry during structure rehabilitation alongside Fosroc repair mortars and joint systems.
Frequently asked questions
What exactly is Fosroc Nitoproof 15?
How is Nitoproof 15 different from Nitoproof 10?
Where should Nitoproof 15 be used — and where not?
How many coats are needed and how is it applied?
Is it safe and easy to handle on site?
Can I buy Fosroc Nitoproof 15 in Delhi NCR or pan-India?
How we position Fosroc Nitoproof 15
Within Fosroc’s own range, Nitoproof 15 is the rubber-reinforced step up from the plain bitumen-emulsion Nitoproof 10, and it shares its below-ground, concealed-coating role with bituminous damp-proofers such as Nitoproof 30. It is distinct from Fosroc’s higher-build and exposed systems — the Brushbond cementitious range (Brushbond, Brushbond RFX, Brushbond UltraFlex, Roofguard) for surface and roof waterproofing, the elastomeric Nitoproof 600 / 600PF liquid membranes, and the Proofex sheet/torch-applied membranes (Proofex Torchseal, Proofex Engage, Proofex Self-Adhesive PR 15/PR 20) used for structural tanking. For a project, Nitoproof 15 typically pairs with Fosroc joint sealants, waterstops and protection boards rather than competing with those systems. Among other Indian-market brands, comparable cold-applied bituminous damp-proof coatings include Dr. Fixit Pidiproof LW+/bitumen-based primers and coatings, Sika’s bituminous emulsions, STP’s bituminous damp-proofing products, and MBS/MYK-class equivalents — all credible alternatives when matching a specification. The right choice depends on substrate, exposure, required film build and flexibility, and the wider waterproofing system; Space Arc Engineering can help select between Nitoproof 15 and these alternatives and supply the verified current TDS before specification.
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