A modified bitumen sheet membrane — almost always SBS modified for the flexibility needed in cold-applied applications — with a pre-applied pressure-sensitive adhesive layer on the underside, protected by a release film. The release film is peeled away during installation and the membrane is pressed firmly onto the primed substrate. No flame, no kettle, no heating equipment of any kind.

Bond is formed by contact adhesion — the tackified bituminous compound wets the primed concrete surface and flows into microscopic surface irregularities, creating both mechanical interlocking and chemical adhesion. Bond strength continues to develop over the first 24-48 hours as the adhesive layer fully conforms to the substrate.

Eurobit product: EuroStick SA-1.70 (1.7mm, 1m × 15m rolls) and EuroStick SA-2.00 (2.0mm, 1m × 15m rolls). SBS modified, polyester reinforced, ASTM D1970 conforming, up to 10 years written warranty.

Liquid waterproofing membranes are applied as a liquid — by brush, roller, trowel, or spray — and cure at ambient temperature to form a seamless, jointless, fully adhered waterproofing layer. Because they are applied as a liquid and cure in place, they conform perfectly to any surface geometry — no cutting, fitting, or lap joint sealing required. This makes them the technically correct choice for surfaces that sheet membranes cannot easily cover: bathroom floors with multiple drain outlets, balconies with complex drainage patterns, water tank interiors, and any surface with multiple pipe penetrations.

The elimination of lap joints is a significant structural advantage — lap joints are the most common failure point in sheet membrane systems, and a liquid applied membrane has none. The seamless film stretches uniformly as the substrate moves, distributing stress across the entire surface rather than concentrating it at discrete joints.

Eurobit liquid membrane range: Euroflex UV · Euroflex PU · Euroflex-2C · Euroflex-7C · Euroflex LAM · Euroflex FBR. Application rate 1.0-4.0 kg/m² depending on product and substrate condition.

A standard modified bitumen sheet membrane — APP or SBS — bonded to the primed substrate using a solvent-based or water-based cold contact adhesive rather than torch heat. The adhesive is applied to both the substrate and the underside of the membrane, allowed to flash off to a tack-dry state, and the membrane is then pressed into position and rolled firmly.

Cold adhesive application allows the full range of modified bitumen membrane thicknesses to be used without heat — including 4mm and 5mm products that provide greater crack-bridging than the thinner self-adhesive variants. This method is particularly relevant for re-roofing over combustible timber or cement-fibre board decks where torch use is explicitly prohibited, and for large commercial or government sites with stringent fire management requirements during construction.

Crystalline waterproofing is applied as a cold slurry or dry-shake to concrete surfaces and penetrates into the concrete matrix, reacting chemically with moisture and calcium compounds to grow insoluble crystals that permanently block capillary pores from within. Unlike all other cold applied membrane types, crystalline treatment does not form a surface layer — it becomes part of the concrete itself and cannot be pushed off by hydrostatic water pressure.

This makes crystalline cold-applied treatment the only viable option for the negative side (interior face) of existing basement walls where water pressure comes from outside — and it is the correct specification precisely because of its cold application method: it can be applied to damp or actively seeping concrete surfaces where no other membrane type can be used.

Concrete must be structurally sound, clean, and completely dry. Remove all form release agents, oil contamination, loose material, and dust. Grind down surface protrusions. Existing cracks wider than 1mm should be routed and filled with compatible repair mortar before membrane application. For cold applied systems this preparation step is more critical than for torch-applied — heat compensates for minor surface imperfections; cold adhesive does not.

Apply EuroPrime WB/SB primer at 0.2-0.4 L/m² by brush or roller. Allow to dry to a tack-dry state — surface feels slightly sticky to the touch but does not transfer to the finger. This typically takes 30-60 minutes in Pakistan’s climate. Never apply SA membrane to wet-primed or unprimed surfaces. The primer is not optional — it is the bonding interface between the concrete and the adhesive layer. Without it, bond strength is substantially reduced and early delamination is the predictable result.

Position the roll on the substrate where it will be applied. For horizontal surfaces, unroll loosely, align, then peel the release film back in sections of approximately 500mm at a time — pressing and rolling each section before moving to the next. For vertical surfaces (basement walls), start at the bottom and work upward. Never remove the entire release film before applying — once the adhesive touches the primed surface, repositioning is not possible without damaging either the membrane or the primer. Overlaps must be minimum 80mm side laps and 100mm end laps.

Immediately after pressing the membrane onto the primed surface, roll the entire applied area using a heavy rubber roller of minimum 25kg. Apply firm, even pressure across the full width in two directions — lengthways and across. Pay particular attention to edges and lap zones. Rolling forces the adhesive into surface irregularities, removes air voids, and increases the contact area — which directly determines bond strength. A membrane pressed by hand without roller compression achieves a fraction of the bond strength of the same membrane with proper roller application. This step is not optional.

SA membrane laps are sealed by the adhesive layer of the upper strip bonding to the top surface of the lower strip. Roller pressure at laps must be doubled — run the roller along every lap edge twice. At T-joints and complex intersections, apply EuroSeal rubber mastic sealant. Detail strips at internal and external corners must be applied before the field membrane — not after. Pipe and service penetrations require SA membrane collar pieces wrapped and bonded around each penetration. Termination edges sealed with compatible mastic or termination bar.

Plain-surfaced SA membrane must be protected from UV on the same day as application. On basement wall applications, EuroBoard 4mm or 6mm protection board is bonded over the SA membrane before backfilling. On re-roofing applications, a screed or finishing layer is applied above. Leaving plain SA membrane exposed overnight is acceptable during multi-day projects but extended unprotected exposure in Pakistan’s direct sun will degrade the surface bitumen and reduce lap bond quality.