A formed element that makes one of the most critical joints in watertight concrete controllable.
The FBZ waterstop centering element is a patent-pending moulded foam part that automatically positions waterstop sheets dead-center in the construction joint between base slab and rising wall of a watertight concrete structure. Displacement, insufficient rebar clearance and wrong embedment depth are eliminated by design. Installation is done by hand, in under one minute per linear meter.
Leaks almost always appear in the same place.
Leaks in watertight concrete structures usually trace back to poorly executed penetrations, joints and connections.
The construction joint between base slab and wall is the recurring weak point of every watertight concrete structure.
It arises in every watertight structure, exactly where water pressure and groundwater meet the concrete. Errors at the waterstop translate directly into leakage here.
The 5 sources of error at the waterstop
They arise from time pressure, improvisation and the absence of a reliable centering aid.
- 01 Displacement during the pour
Insufficient fixation, the sheet shifts when concrete is placed.
- 02 Insufficient rebar clearance
Minimum clearance not met, concrete fails to fully encase the sheet.
- 03 Poor centering
The sheet does not sit centered, one-sided embedment.
- 04 Wrong embedment depth
Too little or too much embedment, without a control tool.
- 05 Coating damage
Damage during the pour, water tightness compromised.
One element. Three steps. No special tools.
Set it on the construction joint.
Slide the waterstop into the slit, it self-centers automatically.
Place the concrete. The FBZ holds the sheet securely in position.
The element.
A formed element that sets the geometry of the construction joint: it guides the waterstop to the center and maintains embedment depth and rebar clearance by design. No measuring, no moving parts.
Precisely made. The waterstop slides in and is guided to the center automatically.
Set by design, no re-measuring and no improvising on site.
Maintained by design, so the concrete fully encases the waterstop.
What the FBZ delivers.
The waterstop sits centered automatically, independent of individual diligence.
Standardised installation instead of improvisation, under one minute per linear meter.
A common installation error source at the base-to-wall joint is systematically reduced.
Simple handling, usable after a brief instruction.
Saves installation time per linear meter and prevents costly follow-up damage at leaking joints.
A fraction of the cost. Without the damage.
Retroactive remediation runs in the five- to six-figure range per case, plus loss of use, expert reports and legal disputes. The FBZ costs a fraction of that per linear meter.
From installation error to damage claim.
A single error at the construction joint is rarely without consequence. It develops over four stages, ending in costs that are a multiple of prevention.
- Stage 01Water ingress
Damp patches, water film and, under groundwater pressure, free water ingress into the structure.
- Stage 02Remediation
Retroactive remediation of the joint in the five- to six-figure range per case.
- Stage 03Consequential damage
Loss of use, mould growth and permanent devaluation of the property.
- Stage 04Legal consequences
Expert disputes, warranty claims and liability questions between the parties.
The FBZ acts at stage 00: it prevents the installation error before the cascade even begins.
Where the FBZ is used.
- 01 Underground car park floors at the base-to-wall junction
- 02 Basements and cellars exposed to groundwater
- 03 Industrial buildings with watertight concrete
- 04 System-build projects with tight schedules
- 05 Any base-slab-to-wall joint with a water tightness requirement
Engineered from long-standing expert practice.
Developed by Dr.-Ing. Jörn Budde, TÜV-certified expert for building waterproofing and structural protection. Emerging from many years of case practice at the base-to-wall joint, the element standardises centering and is delivered across the DACH region.
- Manufacturer
- BBA GmbH
- Developer
- Dr.-Ing. Jörn Budde
- Qualification
- TÜV-certified
- Field
- Building waterproofing
- Patent
- DE 10 2025 121 129.9
- Location
- Bad Saarow, DE
Request a quote.
A short message with your project, linear meters and target delivery date is enough. We usually reply within one business day.