About MC-Bauchemie Emcephob SH

Emcephob SH is MC-Bauchemie’s ready-to-use, colourless silicone impregnation for exterior masonry — the product site engineers reach for when a facade needs to stop drinking water without getting a coating it never asked for. Unlike a membrane or a paint-on waterproofing system, Emcephob SH doesn’t sit on top of the wall; it soaks into brick, plaster, cast stone, fair-faced concrete or gas concrete and lines the internal pore walls with silicone resin. Rain beads up and runs off, but water vapour from inside the wall can still escape, so the structure keeps breathing exactly as before. That distinction matters more in Indian conditions than the technical language suggests: a large share of dampness complaints in Delhi NCR bungalows and low-rise RCC buildings trace back not to leaking roofs but to porous external plaster soaking up monsoon rain and pushing it through to the inside face — and a sealed, non-breathable coating in that situation only traps the moisture, causing it to blister or peel later.

On site, Emcephob SH goes on in a single generous coat by brush or low-pressure spray onto a substrate that is sound, dry and free of dust, oil or old paint film; new plaster is left to cure at least 14 days first. Absorptive surfaces such as exposed brick or lightweight block may need a second coat once the first has dried through, applied wet-on-dry rather than wet-on-wet. It starts working within one to two hours and, being water-based and solvent-free, doesn’t leave the sharp odour associated with older solvent-carried impregnations — a real consideration on occupied buildings, hospitals, schools and running factories where MC-Bauchemie’s India network commonly specifies it. It isn’t a stand-alone waterproofing membrane for roofs, tanks or below-grade structures — for that, Emcephob SH gets paired with the appropriate cementitious or PU system — but as a facade-level defence against rain penetration, efflorescence and frost or salt attack on masonry, it does one job well and stays invisible while doing it.

The technical insight

Emcephob SH belongs to the silicone/siloxane family of hydrophobic impregnations, chemically distinct from acrylic or PU coatings that build a surface film. Brushed or sprayed on, the low-viscosity silicone resin travels into the substrate’s capillary pore structure and bonds to the pore walls, turning a hydrophilic (water-loving) surface hydrophobic at a microscopic level. Because the treatment lines pores instead of blocking them, water vapour transmission is barely affected — the wall keeps breathing — while liquid water driven by wind-borne rain or capillary rise is repelled at the surface. That’s also why Emcephob SH leaves colour and texture untouched: with no film build, brick stays brick and plaster stays plaster, just with water beading on it instead of soaking in. Penetration depth and long-term performance depend heavily on substrate porosity and moisture content at the time of application, which is why the manufacturer’s data sheet is explicit about trialling a patch on glazed, sintered or low-porosity surfaces before committing to a full elevation.

Where it is used

• Exterior facades of brick, block and plastered masonry on residential and commercial buildings
• Fair-faced (exposed) architectural concrete elevations
• Boundary, compound and retaining walls exposed to driving rain
• Heritage and traditional masonry facades needing a visually neutral water repellent
• Gas concrete (AAC block) and lightweight concrete surfaces
• Cast stone, facade stone cladding and natural stone masonry
• Gypsum board and plastered partitions in damp-prone service areas
• Refurbishment of older facades showing efflorescence, moss or fungal staining

Key advantages

• Colourless and non-film-forming — doesn’t change how the substrate looks
• Breathable, so it doesn’t trap moisture the way a sealed coating can
• Deep-penetrating; single coat suffices on most substrates
• Water-based and solvent-free, with low odour on occupied sites
• Becomes rain-fast within just 1–2 hours of application
• Checks efflorescence, moss and fungal growth by cutting off surface moisture
• Helps protect masonry against frost-related spalling in colder months
• Simple brush or spray application with no specialised tools or curing membranes

Limitations & considerations

• Not a waterproofing membrane in itself — structural cracks and joint defects must be repaired first, since it can’t bridge gaps
• Effectiveness depends on substrate porosity; dense, sintered or glazed surfaces need a trial patch before full application
• A 9-month shelf life from manufacture means stock rotation matters on slow-moving sites
• Not suited to submerged, below-grade or ponding-water conditions — it’s a facade repellent, not a tanking system
• Needs a dry (not merely surface-dry) substrate for proper penetration; application on wet plaster reduces performance
• Like all silicone/siloxane impregnations, protection gradually weathers under UV and pollution, so periodic reapplication should be budgeted on heavily exposed elevations

Selection & best practice

Specifications

Industry use cases

How we position MC-Bauchemie Emcephob SH

Within MC-Bauchemie’s own Emcephob range, Emcephob SH sits alongside Emcephob HC (a higher-concentration hydrophobic impregnation for heavier-duty use), Emcephob SX/AC (silane-based penetrating impregnations) and the Emcephob HSC/HSL-W masonry creams used for rising-damp injection — Space Arc typically specifies SH for straightforward facade water-repellency and reserves the injection creams for rising damp inside walls. Where a project brief calls for a Fosroc-branded siloxane facade repellent instead — common on jobs where Fosroc is already the incumbent specification — the closest genuine equivalent is Nitocote SN522, a colourless silane-siloxane impregnation built on the same breathable, non-film-forming principle; specifiers standardised on Fosroc systems, or wanting Fosroc’s protective-coatings range on the same elevation, may lean that way, while MC-Bauchemie’s broader Emcephob masonry-injection lineup makes Emcephob SH the more natural fit when rising damp treatment is also on the table.

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