APP Modified Membrane

APP modification adds a plastic polymer (atactic polypropylene) to the bitumen. The result is a harder, stiffer membrane with exceptional high-temperature resistance and excellent UV stability. It performs best in hot climates.

SBS Modified Membrane

SBS modification adds a rubber polymer (styrene butadiene styrene) to the bitumen. The result is a softer, more elastic membrane with excellent low-temperature flexibility and superior crack-bridging performance. It behaves more like rubber than plastic.

Basement walls before backfilling, below-ground concrete structures, manholes, retaining walls, any location where open-flame torch application is restricted by safety regulations or fire risk. Also excellent for re-roofing over existing membranes where torch heat might damage the existing layer below.

Suitable for new concrete surfaces in good condition with minimal existing cracks. Used as a base layer in two-coat systems. Lightest roll weight — easiest to handle on site.

The most commonly specified thickness for Pakistan. Bridges hairline cracks effectively. Suitable as a single-layer system on prepared surfaces or as the top layer in two-coat applications. The best value for most DHA and Bahria Town rooftops.

For roofs with significant existing cracking, for car parks and areas with regular wheeled traffic, for basements under severe hydrostatic pressure, or for any application where maximum durability is required.

The substrate must be clean, dry, and structurally sound. All dust, oil, loose material, and old failed waterproofing must be removed. Existing cracks wider than 0.3mm should be filled with Euro Repair mortar before membrane application. This step is where most cheap contractors cut corners — and where most membrane failures originate.

EuroPrime water-based or solvent-based primer is applied to the prepared concrete surface at 0.2-0.4 L/m². Primer penetrates the concrete surface, seals dust, and creates a bonding bridge between the substrate and the membrane. Without primer, the membrane adhesion is significantly reduced. The primer must be fully dry before membrane application begins.

The membrane roll is unrolled slightly ahead of the torch flame. The torch heats the underside of the membrane and the primed concrete surface simultaneously — both must reach the correct temperature for the bitumen to flow and bond. The roll is pressed and pushed forward, forming an immediate bond. Each adjacent strip overlaps the previous by a minimum of 80mm on side laps and 100mm on end laps. All laps must be fully sealed with no cold areas.

The highest-risk areas of any rooftop waterproofing system are the details — drain collars, pipe penetrations, parapet wall upstands, and corners. Membrane strips are cut and torch-applied around each penetration and carried up parapet walls by a minimum of 250mm. EuroSeal rubber mastic sealant is applied at all critical termination edges. These details take more time than the flat roof area but are the most important part of the job.

Once the membrane is fully applied and cooled, all laps and details are inspected visually. On flat rooftops, a flood test (ponding 25mm of water for 24-48 hours) confirms the system is fully watertight before any protection screed or finish is applied above. Eurobit provides written documentation of completed work with product batch numbers for warranty purposes.