Concrete construction joints

The quality of the concrete structure waterproofing is critical in terms of the whole structure’s life and health. Over time, and primarily due to the development of waterproofing materials the methods for achieving watertight joints have changed, and the entire approach has evolved.

As a contracting entity or a builder, you have several 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 answer the question, might your job involve the load-bearing or nonbearing structure.

When to use construction joints?

For load-bearing structures, it is convenient to formulate joints with an appropriate joint profile.

Profiles ensure a dovetail-shaped cross-section to carry the load forward and ensure the joints are watertight. It’s possible to reduce the total number of joints using special volume depletion cracks or using volume depletion or temperature joint formation profiles.

It is possible to choose between different nonbearing structure options: use joint tapes (swelling or metal) or the injection tubing, gluing a tape on an already formed joint.

There are two types of joint tapes – with passive and with changing characteristics. Passive bands are metal tapes (PVC tapes are also passive). When properly installed, this joint solution will stay watertight and not depend on the changing water level. Metal tapes are coated with adhesion improving material.

The so-called swelling joints, made of bentonite clay or synthetic rubber material, will increase by 200% to 400% when in contact with water. This swelling closes the water passage and ensures proper watertightness. However, problems could 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 significant problem, but it can’t be allowed in the case of specific constructions (e.g. elevator shaft).

When do you have to use the injection hose?

The injection hose is a very convenient backup solution if you use it in combination with a joint profile or swelling joint tape. If you install joint profiles successfully and there is no leak, you won’t need the hose. However, if errors and leakages occur, use the hose to inject appropriate resins into the workpiece and close the leaks. You can use the hose for injection even after years of exploitation.

These methods – tapes, profiles, hoses – are all either good alternatives or excellent complementary methods to each other.

Our product range also includes UFOseals and plugs suitable for waterproofing hollow spacers for piped and new non-pipe versions.