About MC-Bauchemie MC-Nafuplan 15

MC-Nafuplan 15 is MC-Bauchemie’s self-adhesive entry in the Nafuplan waterproofing range — a 1.5mm SBS-modified bitumen sheet that bonds cold onto prepared concrete, without the LPG torch that torch-on membranes need. On Indian sites that matters two ways: it takes an open-flame hazard out of confined basements, lift pits and tunnel sections, and it lets less specialised crews achieve a consistent bond if lap and roller discipline is followed. Built from a black PE top film, self-adhesive polymer-modified bitumen, and a peel-away silicone liner, MC-Bauchemie positions it for RCC roofs, roof gardens, retaining walls and cut-and-cover tunnel or subway linings.

On the numbers, MC-Bauchemie’s own data (ASTM/DIN tested) shows 2.5 N/mm² tensile strength, 230% elongation at break, and no leakage at 5 bar hydrostatic pressure for an hour — suited to Delhi NCR’s high water-table basements and monsoon terraces. Space Arc supplies and applies MC-Nafuplan 15 across Delhi NCR and pan-India; since sheet-membrane failures are almost always workmanship failures at laps rather than material failures, our site checks focus on overlap width, air-bubble rolling and termination detailing before any screed or backfill covers the membrane.

The technical insight

SBS modification is what gives the membrane 230% elongation without splitting: the rubbery butadiene portion lets it stretch and recover across minor substrate movement or hairline cracking, while the styrene portion resists flow in Indian roof-deck heat. Because it’s fully adhered rather than loose-laid, a puncture stays localised instead of letting water migrate to the nearest penetration or termination — the main reason specifiers pick self-adhesive, fully bonded systems for below-grade tanking. The hydrostatic test (5 bar for 1 hour) corresponds to roughly 50m of water head, well beyond most basement or retaining-wall exposure, though it’s no substitute for correct overlap and termination work, which MC-Bauchemie’s own data sheet flags as the real risk area on site.

Where it is used

• RCC roofs, terraces and roof gardens, laid beneath a protective screed or paver bed
• Underground basement retaining walls, against sub-soil moisture, chlorides and sulphate attack
• Cut-and-cover tunnel lining
• Subway boxes and underground pedestrian walkways
• Fully bonded basement tanking, applied before backfill
• Podium decks and habitable roof areas needing a fully adhered (not loose-laid) membrane
• Pre-pour, under-raft waterproofing on blinding concrete ahead of foundation casting

Key advantages

• Self-adhesive — no torch or hot bitumen, faster and safer in confined basements and tunnels
• Fully bonded, so a puncture doesn’t let water track sideways under the sheet like loose-laid systems
• 230% elongation at break absorbs minor substrate movement and shrinkage cracking
• No water leakage at 5 bar hydrostatic pressure for 1 hour — suited to high water-table basements
• Resists ground salts, chlorides and sulphates typical of Indian sub-soil and coastal sites
• Workable down to -5°C with hot-air pre-heating at laps
• Simpler skill requirement than torch-applied membranes, easing dependence on scarce torch crews

Limitations & considerations

• Not for exposed use — must be protected by a screed or protection board; direct sun and traffic will degrade it
• Needs a smooth, dry, contamination-free concrete surface; poor prep is the main cause of adhesion failure
• Cold-weather laps need hot-air gun pre-heating, an easy step to skip on site
• Performance hinges on lap width and roller discipline; the data sheet itself flags faulty joints as the main failure risk
• As a sheet system it’s slower to detail around penetrations and irregular geometry than a liquid-applied or crystalline system such as MC-Nafuplan EW or MC-Nafuplan

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie MC-Nafuplan 15

Within MC-Bauchemie’s own Nafuplan range, MC-Nafuplan 15 sits next to MC-Nafuplan (a cementitious crystalline coating that waterproofs the concrete matrix itself rather than sitting on top of it) and MC-Nafuplan EW (a liquid-applied elastic polymer-bitumen coating for roof slabs where a seamless, cold-applied finish is preferred over sheet laps). Choose the sheet membrane for large, relatively flat decks and vertical tanking; choose MC-Nafuplan or MC-Nafuplan 2K for intricate detailing, pipe penetrations and wet-area corners. Outside the MC-Bauchemie stable, Fosroc’s Proofex Torchseal 4SI Standard is the closest genuine equivalent — a 4mm, APP-modified, polyester-reinforced bituminous membrane — and a specifier might choose it where the site crew is already set up for torch-on work, or where the extra thickness suits heavier podium traffic.

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