Balcony sealing and uncoupling membrane CERAfix^® 315

Substrate:

The substrate must be load-bearing, sufficiently flat in accordance with DIN 18202, and free from cracks and loose substances. The substrate must have a largely closed surface quality and strength that corresponds to its type.

Smooth concrete surfaces must be roughened. Prime substrates according to their requirements.

All flat, load-bearing surfaces that can support tiles and panels are suitable and are therefore suitable for accepting tile compound sealant. Furthermore, the suitability of the substrate must be mentioned in the corresponding moisture resistance classes (observe the Central Federation of the German Building Trade's technical information leaflet).

Separating cracks must be assessed by experts and, where necessary, be sealed non-positively with CERAfix 203.

Compensate for a height offset on the laying substrate in advance by applying CERAfix 201 or CERAfix 202. Moisture ingress from the underside of the sealing layer must be excluded.

In areas exposed to moisture, a sufficient slope of at least 1.5 %, must be formed in advance, in the direction of drainage.

Floor drains should be provided with thin bed flanges that have a minimum all-round width of 5 cm and should be made of a material suitable for bonding, e.g. stainless steel, gunmetal or PVC-U.

Hot screeds must be heated before covering work, in line with technical regulations. To assess how mature the covering is, perform a moisture measurement using the CM unit. The CM moisture content must not exceed 2.0 CM% for cement screeds, 0.5 CM% for screeds on insulation or a separation breather and calcium sulphate screeds without underfloor heating, and 0.3 CM% for calcium sulphate screeds with underfloor heating. The CM measurement must be conducted in accordance with the current work instruction "Interface coordination for heated floor constructions". Calcium sulphate substrates or substrates sensitive to moisture are only acceptable for indoor use with no exposure to moisture and where only decoupling needs to be carried out.

Application:

Over the substrate, comb through a CERAfix PLUS system tile adhesive with a 4-6 mm notched trowel and insert CERAfix 315 balcony and uncoupling membrane; carefully apply pressure to the membrane. Ensure bedding across the entire surface. The joints should be filled with a wide coating of approx. 15 cm using CERAfix 300/301 or SMP Sprint and the joint tape provided should be carefully inserted and pressed into them. For laying tiles, spread the mixed CERAfix PLUS on top of CERAfix 315 and, depending on the board size, comb through with a suitable notched trowel and lay the covering material within the adhesive drying time.

• Check and clean the substrate, and prepare according to specifications. If necessary, roughen and clean facing panel profiles, floor drains, and degrease with an agent such as acetone (check material compatibility!).


• Put clean water in a clean mixing bucket, add CERAfix PLUS system adhesive and mix using a Würth agitator (approx. 500 rpm) until there are no lumps. To lay CERAfix 315, a supple, smooth consistency must be used to achieve good connection with the CERAfix 315 needle felt.


• Cut CERAfix 315 to fit with a blade or scissors. Comb the CERAfix PLUS tile adhesive over the prepared substrate with a notched trowel that is at least 4 mm and maximum 6 mm wide; the adhesive should be approx. 10 cm wider than the film width. Then add the CERAfix 315 to the adhesive bed and firmly push into the adhesive bed with a smooth comb or a roller to ensure that there are no cavities or wrinkles. It must be ensured that the dark side (needle felt) of the CERAfix 315 on the roller facing outwards is bonded to the substrate. Complete bedding and good cross-linking from the non-woven fabric to the adhesive must be ensured. The cut strips are laid so they are blunt and flush with each other.


• On account of the non-woven lamination on the back, CERAfix 316 sealing tapes must always be connected to the upper side of CERAfix 315 - thin non-woven fabric - to ensure that capillary water transport is excluded.


• The joints between the individual strips are reworked with the balcony joint tape contained in the scope of delivery or CERAfix 316. To do this, use a 4 mm notched trowel to apply the tape on both sides of the joint to be bridged; carefully press the balcony joint tape in place with a smoothing trowel so that there are no cavities or wrinkles.


• Bond CERAfix inner and outer corners on the CERAfix 315 and on the prepared wall surface in the corner areas, in the transition between the wall and floor as well as over connection joints with a layer of CERAfix 300/301/SMP Sprint so that there are no cavities and wrinkles. Sealing tape joints have an overlap of at least 5-10 cm. It must be ensured that a tight seal is produced between the wall and surface seal.


• Drains must have suitable thin bed flanges. Apply CERAfix 300/301/SMP Sprint using a 6 mm notched trowel. Bed CERAfix floor sealing collar into the CERAfix 300/301/SMP Sprint layer so there are no cavities or folds; this is to create a tight bonded connection to CERAfix 315.


• The tiles or boards must have a minimum surface of 100 cm² and minimum tensile strength of 1,500 N. Lay the frost-resistant tiles or boards with CERAfix PLUS system tile adhesive within the adhesive drying time so that there are no virtually no cavities. Produce a contact layer on the CERAfix 315 and then comb through evenly with a suitable toothed trowel, depending on the board size. Tiles or panels can be laid directly on freshly laid CERAfix 315 when the seal has corresponding protection and a distribution of the load is ensured. For outdoor use, a virtually cavity-free bedding of tiles must be ensured.


• CERAfix joint agent is used to join tile coverings, even on natural stones. Keep moving joints free to ensure elastic joining.


• The sealing of the connection and movement joints is carried out with suitable Würth sealants.