Waterproofing construction joints with bentonite swelling joint tape - White tanks
Key Facts
The advance installation of swelling joint tape has proved itself practically as an alternative system versus injection hoses. Bentonite swelling joint tape consists of a mix of sodium-bentonite and special filling materials. This reacts with a strong, reliable swelling behaviour (> 500%) in case of contact with water. The area of application includes construction joint waterproofing, joints that are constantly or temporarily exposed to loading from ground, slope, and/or surface water. Use is also possible in water exchange areas. Bentonite swelling joint tape has the advantage that even fine cracks resulting from the swelling process can be sealed reliably and permanently.
1 Bonding with a mounting adhesive
Spray the assembly adhesive onto the cleaned substrate using a hand cartridge and press in the AQUAFIN-CJ4 swelling joint tape covering the whole area until the assembly adhesive pushes out at the sides.
2 Mechanical fixing
Alternatively, AQUAFIN-CJ4 swelling joint tape can be screwed, nailed, or connected to the water-conducting side with a concrete covering of at least 8 cm, including a fastening grate screwed on with 4–6 fastening points. AQUAFIN-CJ4 must be applied covering the whole area of the concrete substrate.
3 Butt joints
Swelling joint tape connections with AQUAFIN-CJ4 can be applied as blunt connections. In case of larger wall profiles, secure the butt joints with a separate swelling tape featuring an overlap of at least 50 mm.
4 Overlapping joints
Alternatively, swelling tape connections can be applied with an overlap of at least 50 mm. In this case, both swelling tapes should be positioned close together to prevent voids.
5 Corner joints
Corner connections should essentially be applied with an additional safeguard.