So the customer has picked their tiles and now you’re thinking about which tile adhesive to use. Factoring in different substrates, tile types and the job’s surrounding environment, it’s vital that you choose the right adhesive for your project.
Tiles can experience a lot of stress due to movement in the substrate, foot traffic and thermally-induced movement that can come from underfloor heating. A flexible adhesive can absorb some of this stress and help reduce the chances of your tiles cracking – the more flexible the adhesive, the more peace of mind you have.
With that said, we’ve put together some tips to help you select the best flexible tile adhesive for your project.
Improved Flexible Tile Adhesives (S1)
Any tile adhesive rated as S1 or S2 means it has a higher degree of flexibility in comparison to other tiling adhesives. In effect, each classification describes how much an adhesive will deform in order to accommodate a limited amount of movement after tile fixing.
If it’s S1 rated, it’s deformable. In general, an S1 adhesive will be suitable for most applications, such as fixing all types of ceramic wall and floor tiles, mosaics, marble, terrazzo and natural stone to most wall and floor substrates – this includes plywood, anhydrite screeds and power floated concrete. You can also use an S1 adhesive when tiling onto electric underfloor heating.
Products like weberset SPF or weberset rapid SPF are particularly suited for situations where some movement, deflection or limited shrinkage is likely. An added benefit of weberset rapid SPF – aside from it including weber’s Low Dust Technology™ – is that it allows for light foot traffic after two hours. A full load is possible after 24 hours.
Ultra-Flexible Tile Adhesives (S2)
If it’s S2 rated, it’s more deformable. In areas subject to lots of vibration or movement, you will want to use an S2 rated adhesive. Our best flexible tile adhesive for wooden floors and heavy/large tiles is weberset pro lite – rapid, a lightweight, rapid-setting (two hours), ultra-flexible cement-based adhesive. Used to fix all ceramic tiles, porcelain, mosaic, quarry, marble, terrazzo and natural stone, it can also be used to tile onto suspended wooden floors.
Where more vibration and movement is likely, or for large format tiles, the best solution for walls would be to use weberset plus mixed with weber AD250, a synthetic water-based admixture that disperses highly flexible acrylic polymers when added to standard adhesives. Replacing the need for water, it strengthens the bond of the adhesive and eradicates the need for a primer.
Another benefit of using weber AD250, when added to weberset plus it provides the strength and quality of an S2 adhesive – like weberset pro lite – rapid – but it’s not fast-setting so it gives you more time to complete any larger projects you’re working on.