HomeConcrete construction joints
Joints in concrete flatwork
The quality of the concrete structure waterproofing is extremely important in terms of the life and health of the whole structure. Over time, the methods for achieving watertight joints have changed and the whole approach has evolved. This is also largely due to the development of waterproofing materials.
Today each contracting entity and builder has a number of different waterproofing options to choose from, starting from the joint tapes to the injection tubing. How to choose the right solution for your task? Our team in Primostar is always here to help you answering the question, might your task involve the load-bearing or nonbearing structure.
For load-bearing structures, it is convenient to formulate joints with an appropriate joint profile.
Profiles ensure a dovetail shaped cross-section in order to carry the load forward and ensure the joints being watertight. It is possible to reduce the total number of joints by using special volume depletion cracks or by using volume depletion or temperature joint formation profiles.
In case of nonbearing structure, it is possible to choose between different options: either to use joint tapes (swelling or metal) or the injection tubing, glueing a tape on an already formed joint.
Joint tapes can be divided into two – with passive and with changing characteristics. Passive bands are, for example, metal tapes (PVC tapes are also passive). When properly installed, such a joint solution is always watertight and does not depend on the changing water level. Metal tapes are coated with adhesion improving material.
The so-called swelling joints, which are also made of bentonite clay or synthetic rubber material, increase by 200% to 400% in case of contact with water. This swelling closes the water passage and ensures watertightness. However, problems arise when water levels are volatile. It takes 1-3 days for the material to expand and during that time a small amount of water can penetrate the joint. Usually, it is not a great problem, but it can't be allowed in case of certain constructions (e.g. elevator shaft).
When do I have to use the injection hose?
The injection hose is a very convenient back-up solution if used in combination with a joint profile or swelling joint tape. If tapes are installed successfully and there is no leak, the hose will not be used. However, if errors and leakages occur, it is possible to use the hose to inject appropriate resins into the workpiece and thus close the leaks. The hose may also be used for injection after years of exploitation.
These methods – tapes, profiles, hoses – are all either good alternatives or excellent complementary methods to each other.
The more important the waterproofing of the underground structure, the more variations of complementary methods to secure the watertightness are used.
The product range in Primostar also includes UFOseals and plugs suitable for waterproofing hollow spacers for both piped and new non-pipe versions.

ASO-Tape (INDUBOND-Tape-3000)

Thermo-plastic tape for waterproofing joints

WFP Epoxy Adhesive

Epoxy resin adhesive /-mortar Pigmented

SikaFuko Injection hose systems

Injectable hose to seal construction joints in watertight structures against water and salt water ingress.

WFP Injection Hose ECO

Universal PVC injection hose and system accessories


WPM sealing element 125R with mineral coating


WPM sealing element 80R with mineral coating


WPM Sealing Element 125L with mineral coating


Waterproof, element that do not weaken cross-section for creating the defined cracks.

Sika® Waterbar PVC-P

Sika Waterbar® made from PVC-P can be used as flexible waterstops and are designed for the sealing of movement (expansion)

Sika Waterbar PVC-R

Waterbars based on recycled PVC (PVC-R) for sealing and waterproofing construction and movement joints in concrete  structures  

Sika Waterbars Tricomer BV Type

Tricosal Tricomer BV Waterbars are highly flexible waterstops made from PVC/NBR copolymer for sealing expansion and construction joints in watertight


Solvent-free, thixotropic 2 component universal epoxy adhesive


Metal wire mesh for the fixation of water swellable sealing bars


Perfect for application in seawater and contaminated water


Hydrophilic water stop based on synthetic rubber that acts as a watertight sealing for construction joints with excellent swelling capabilities.


Revolutionary waterstop for sealing construction joints


Fast and strong fixation of hydrophilic profiles to concrete


BeSealed water swellable paste is a high quality, one component polyurethane adhesive which swells in contact with water.

BENTOBAR+ (20 X 25 mm)

Bentonite waterstop for sealing construction joints

WFP Swelling Rubber Profiles

The WFP Selling Rubber Profile is a joint profile with a swelling volume of more than 430% in contact with

WFP Bentonite Water Stop Tape

Bentonite water stop tape for concrete joints