Ready-mix and powder adhesives have their advantages and disadvantages, and are best suited to slightly different projects. The real difference is in the chemistry of how the products dry. But what does that mean in practice? Saint-Gobain Weber explains…
Ready-mix adhesives dry a bit slower than powder adhesives, due to the evaporation process, so while it may have the convenience factor, it can have its limitations.
The way it dries makes it unsuitable for tiling onto floors or for porcelain tiles (with the exception of weberfix pro lite, which can be used for smaller porcelain tiles). This is due to the fact it relies on the air to dry, whereas cementitious powder tile adhesives dry chemically.
Ready-mixed adhesives are ideal for tiling areas, such as kitchen splashbacks where the levels of moisture are lower, but check if it’s suitable for use in wet areas.
These tile adhesives are ideal for smaller projects and great for quick jobs that do not need a more versatile adhesive.
Powdered adhesives come in various grades and dry as a chemical reaction takes place after mixing. Suitable for most tiling jobs and types of tiles — including ceramic, porcelain and natural stone, as well as larger tiles — powder tile adhesives can also be used in wet areas such as bathrooms or wet rooms.
Unlike ready-mix tile adhesives, powdered tile adhesives can be used for tiling floors, and are suitable for use in outdoor projects, such as laying paving or patios. With flexible varieties available, these types of adhesives are suitable for tiling over underfloor heating, or in areas where movement is expected.
What’s more, with new innovations such as Low Dust Technology™, Weber powder adhesives are safer and more convenient to use than ever.
Whether working with ready-mix or powder adhesives, there’s a method of classification that means it’s quick and easy to choose the right adhesive for the job:
C1 (normal cementitious) and C2 (improved cementitious) classifications refers to the strength of powder adhesives.
D1 (normal dispersion) and D2 (improved dispersion) classifications regards the strength of ready-mix adhesives.
E classifications are used for tile adhesives which have an extended open time, meaning the product won’t start to set too quickly after being spread with a notched trowel – useful for larger jobs.
An F classification refers to a tile adhesive which is fast setting in nature, this is useful when tiling in lower temperatures where the setting process may take longer, or where there is a tight deadline.
Flexible tile adhesives are denoted with two classifications: S1 (improved flexible tile adhesive) and S2 (ultra-flexible tile adhesive), which are suitable on substrates which are subject to deflection and movement.
T classifications refer to tile adhesives which have reduced slip – useful for applying larger or heavier tiles onto walls, keeping them firmly in place throughout the tiling process.
The adhesive required will be dependent on the scope of the project and what the adhesive needs to do. For advice on an upcoming tiling project, contact Weber’s technical team on 01525 722 100 or [email protected]
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