ADHESIVES & GROUTS
One of the most common is the idea that S1 is for walls and S2 is for floors. In reality, the classification has nothing to do with orientation it is purely about movement and the conditions of the substrate.
Another is the assumption that more flexibility is always better. While S2 adhesives provide a greater margin for movement, they are not always necessary. On a stable, well-prepared substrate, a correctly specified S1 adhesive can deliver excellent long-term performance without adding unnecessary cost.
THE ROLE OF PREPARATION AND SYSTEMS
Adhesive performance does not exist in isolation. Substrate preparation, priming and overall system compatibility all play a critical role in the success of an installation.
Using a compatible primer helps create a stable, uniform background, improving adhesion and reducing the risk of issues such as rapid moisture loss or weak bonding. When adhesives and primers are designed to work together as part of a system, it can also simplify decision-making on site and reduce the likelihood of compatibility problems.
Manufacturers are increasingly responding to this need by developing more streamlined, system-led ranges that align
x.com/TomorrowsTS
preparation and fixing stages, helping installers work more efficiently while maintaining performance.
PRACTICAL TAKEAWAYS
For installers, the most effective approach is to focus on a few key considerations: • Assess the substrate: is it stable, or prone to movement?
• Consider environmental factors: will there be heating, cooling or external exposure?
• Factor in tile size and material: larger and denser tiles demand more from the adhesive.
• Follow manufacturer guidance for both adhesive and substrate systems.
• Where possible, use a coordinated primer and adhesive system to reduce variables.
Ultimately, understanding what adhesive classifications mean in practice allows tilers to make more informed decisions, avoid unnecessary over-specification and deliver installations that perform reliably over time.
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