ALL ABOUT THE BASE
The key to achieving the perfect floor finish lies in subfloor preparation and selecting the correct smoothing underlayment, says UZIN.
Whether for use in a new-build or refurbishment project, choosing the right smoothing compound is critical for ensuring the success of any final floor finish. The appearance and performance of the floorcoverings are determined to a significant extent by the quality of the prepared base on which they are installed.
Many factors can affect which smoothing compound should be chosen. These include; the substrate type, site conditions, occupational use and type of floor covering installed. UZIN provide a range of different smoothing compounds for every situation.
The type of substrate can affect which smoothing compound is chosen. Cementitious smoothing compounds such as UZIN NC 150 or UZIN NC 152 are the most common form of smoothing compound and can be used over most surfaces if the substrate has been correctly prepared such as cement or concrete. Other surfaces such as wooden substrates need to be handled differently as they will require a fibre-reinforced smoothing compound such as UZIN NC 196.
When working on refurbishment projects there are a number of issues which need to be considered. The old floorcovering may need to be removed, the floor might just need to be cleaned, or ground to remove old residues of cement or adhesive. There may be surface contaminants, laitance or residues which need to be removed.
At UZIN we strive to make flooring installations simpler and quicker. We have therefore improved our range of smoothing compounds with the launch of new products for example UZIN NC 196 a cost-effective fibre-reinforced smoothing compound. All UZIN have been developed in close cooperation with our customers to provide floor contractors with exceptional quality which are easy to use. This also ensures our products are reliable and produce outstanding results.
14 | COVER STORY
It is recommended that all contaminants are removed, although some smoothing compounds, such as UZIN L3 Gold or UZIN NC 163, can be used over old waterproof adhesive residues which are well bonded to the substrate.
Another important factor to consider is the type of floorcovering to be installed. Some coverings place higher demands on the surface strength of a smoothing compound. It naturally follows that with these materials, high-strength cement-based compounds should be used. For example, because of changes due to moisture, wood flooring will build up high shear forces between itself and the substrate. In these cases a higher flexural strength cement-based product should be used, something with a minimum F 7 N/mm² flexural rating such as UZIN NC 170.
Most smoothing compounds will dry and allow moderate foot traffic after approximately two to three hours, but will not be ready to accept the floorcovering for 20 to 24 hours. With project deadlines squeezed ever more tightly, choosing the correct smoothing compound can help expedite projects. Smoothing compounds such as UZIN L3 Gold or UZIN NC 172 BiTurbo dry extremely quickly and allow a covering to be installed after just one to two hours.
As with all smoothing compounds, correct mixing and application methods are paramount – overwatering, wrong temperatures, and poor airflow – will all lead to potential problems. Choosing the right smoothing compound can be diverse and complex. Ultimately, the individual project, site conditions and the user preferences must determine the steps taken. Smoothing compounds can help speed up projects and aid with environmental building certification.
The UZIN Technical Team is pleased to provide help, support and advice if required.
www.uzin.co.uk
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