The deciding factor for the attractive appearance of the flooring expected by the end consumer is perfect preparation of the substrate. The levelling compound should ideally be stretched out and de-aerated for this. When replacing cushioned vinyl or textile floor coverings with luxury floor coverings, the impact sound absorption can be significantly reduced. This problem mainly occurs in rental properties. In this instance, the luxury floor covering’s basic range of use is cleared for the respective property.
Installing on installation underlays: Wet bonding is generally not possible on installation underlays due to insufficient absorbency. If the pressure bonding method is then used as an alternative by selecting a suitable adhesive, the combined effect of two “soft” layers creates a considerable risk for impressions. Similar applies for resistance to castors. If the installation underlay itself still contains plasticisers, the damage can no longer be prevented (image 3).
Complaints are inevitable when installing diagonally on roll tackifier. The many intersectional planes lead to a high number of small flooring pieces that cannot be securely locked by the roll tackifier. If movement joints are running in the space, the situation will be further exacerbated by the once again increased proportion of waste.
“Prefer” would be the wrong word. What’s key in your selection is which application you’re planning on.
First choice: Wet adhesive
Wet adhesives are good for universal use under luxury floor coverings and secure in application and surface use - the installer thus safely avoids mistakes and claims later on. But wet adhesives aren’t synonymous with “conventionally levelled adhesive,” because that also includes pressure-sensitive adhesives. However, pressure-sensitive bonding comes with a significant risk of residual indentations and dimensional changes - therefore it is no longer considered to be state of the art under luxury floor coverings today. In addition, pure wet adhesives in the system with the appropriate levelling compound tightens very quickly. It can reach more than 50% of its final strength within the first hour, which fosters high security and an optimum installation result with the respective luxury floor covering.
Special requirements: Dry adhesive
Selection criteria include fast processing and immediate load-bearing ability, installation on old flooring, installation without impacting the job site negatively, and can be removed without leaving residue.
Limited performance requirement and flooring selection: Roll tackifier
Roll tackifier for “simple” requirements and only for dimensionally stable floor coverings. There is a restriction, however, that takes effect once the floor covering has been removed. Removing the old tackifier is extremely difficult due to their softness and lasting adhesive properties - in our experience, a new construction can follow once the tackifier residue has been “isolated” with a 2-component PUR levelling compound.
In cases of application wherein dry or wet adhesives can be used equivalently, we would give the preference to dry adhesive: It’s innovative, sophisticated in installation, and unmatched for environmentally compatibility.
Which type of adhesive for which installation case?
Wet adhesive is universal because
It is the only adhesive that can be used safely with underfloor heating, high temperatures/direct exposure to light, and all floor coverings, and can work against joint formation.
The only drawback: You have to pay attention to product-specific setting times. Dry adhesive and roll tackifier are special products for the applications described above.