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Selection of expansion joint mouldings - types, application and recommendations
The fault-free operation of floors depends largely on the correct selection of expansion joint strips. Their task is to compensate for deformations and displacements of building structures, resulting from, among other things, temperature changes, settlement, concrete shrinkage or dynamic loads.
Types of expansion joints - a brief overview
- 📏 Thermal - protect against cracks and fissures caused by temperature changes.
- 🏗️ Construction - separate structural elements of the building.
- 🔧 Technology - eliminate the effects of material shrinkage and swelling.
- 🔇 Anti-vibration - dampen vibrations and shocks (e.g. in lifts, boilers).
- 🏚️ On settlement - prevent the effects of uneven building settlement.
How do I choose the right expansion joint strip?
A number of structural and operational parameters must be taken into account when selecting the right expansion joint profile:
- ➡️ width and extent of expansion joint displacement
- ➡️ type of flooring and thickness of finishing layers
- ➡️ load intensity (class 1-4)
- ➡️ working environment (chemicals, humidity, sanitary conditions)
- ➡️ the need for fire, damp or acoustic insulation
Types of expansion joint mouldings
- 🔹 Surface - Quick installation without a cavity, ideal for retrofitting.
- 🔹 Embedded with elastomer insert - aesthetically pleasing, hygienic, easy to maintain.
- 🔹 Metal - for heavy traffic (e.g. forklifts, vehicles), very durable.
Expansion joints and building design
The arrangement of expansion joints should take into account, among other things, differences in construction, foundation and loads. Expansion joints should be carried out in a single plane from the foundation to the roof, and their presence should be planned already at the building concept stage.
Most common errors and installation recommendations
- ❌ recess for skirting board too shallow → risk of concrete cracking
- ❌ lack of thermal expansion compensation → damage to rails
- ✔ leaving expansion joints for temperature changes >11°C
- ✔ Anchoring the slat every 35 cm
- ✔ installation of fire and moisture barriers prior to skirting board installation
The professional selection and installation of expansion strips is a key element in the durability and functionality of any industrial or hospital floor.
