Membrana SP

The substrate should meet the following requirements:
- dry substrate (concrete in an air-dry condition, without any visible traces of moisture or darkening caused by moisture),
- clean substrate (the surface of the concrete is free of loose fractions, dust, oil stains, grease and other impurities),
- smooth substrate (local unevenness and cavities in the surface of concrete do not exceed ± 5 mm),
- even substrate (the gaps between the surface of the substrate and a 4 m long batten placed on the concrete substrate do not exceed 10 mm).

Before installing NEXLER Membrana SP, it is recommended to prime the concrete substrate with solvent-based asphalt agents, e.g. NEXLER Penetrator G7, or a water-based asphalt preparation, e.g. NEXLER BITFLEX Primer.
 

The product should not raise any objections. The roll should be evenly rolled, without kinks.
 

If it is necessary to make the covering at low ambient temperatures, it is recommended to store the rolls in heated rooms at a temperature of not less than +18°C for 24 hours before installation.

During acceptance, the following should be checked:
- correctness of bonding of overlaps,
- adhesion of the bituminous felt to the substrate,
- correct application on vertical and horizontal connections,
- method of attaching the upper edge.
 

The underside of the membrane and a approximately 5 cm wide edge strip on the top side are covered with special paper and an anti-adhesive foil, which must be removed during application installation.
When bonding NEXLER Membrana SP, maintain an overlap of approximately 5 cm along the membrane strip, which is a self-adhesive overlap on the top side of the membrane, and an overlap of at least 10 cm at the joint perpendicular to the length of the membrane strip. The membrane overlaps must be pressed firmly during application. After completing each bonding operation, it is essential to check the correctness of the membrane connections at the overlaps. NEXLER Membrana SP can be installed in temperatures as low as -5°C, provided the surface is dry before application. At low ambient temperatures, if necessary, the self-adhesive properties should be activated by appropriately heating with a heat gun or small torch, primarily the substrate and only slightly the membrane, to prevent the bitumen from flowing. Immediately after applying the NEXLER Membrana SP to a wall, secure the membrane to the concrete at its upper edge using quick-mounting plugs with washers that are 3 - 4 cm long, spaced every 20 cm, and apply a filler, such as NEXLER Arbolex Aqua Stop, to the fastened edge. At the joints where the horizontal and vertical surfaces of the building's underground sections meet, a facet with bituminous compound should be made, and an additional strip of membrane should be installed. The facet should have a side length of 2 cm and can be made, for example, using NEXLER Arbolex Aqua Stop, preferably a few days before installing the membrane. The additional membrane strip should be at least 15 cm wide, with half of the strip installed on the vertical surface and the other half on the horizontal surface. The prepared joint element should be covered with NEXLER Membrana SP from the roll.  Because the membrane has a slippery surface, it is not recommended for use under partitions and load-bearing walls.
Details of substrate preparation and bituminous felt fixing are described in NEXLER Insulation Systems.

Before use, please read the application details in the product's Technical Data Sheet.