--- title: Why do we need self-levelers and moisture barriers today if we didn’t need them 20 years ago? description: A number of changes in the built environment have led to an increase in problematic subfloors. Some of these changes include changes in how concrete is manufactured such as the addition of chemical additives; changes in cement because the water ratio has been increased; power floating and fast-track building programmes. image: https://info.polysales.com/hubfs/Ask%20Denver%20Subcreeds.png --- [![Polysales_Logo_FullColour](https://info.polysales.com/hubfs/Polysales_Logo_FullColour.png)](https://www.polysales.com/) - [WHY VINYL](https://www.polysales.com/why-vinyl/) - PRODUCTS - [PRODUCTS](https://www.polysales.com/flooring-products/) - [ROLLING REGULARS](https://www.polysales.com/rolling-regulars/) - [SOLUTIONS](https://www.polysales.com/flooring-solutions/) - [PROJECTS](https://www.polysales.com/featured-projects/) - [NEWS](https://info.polyflor.co.za/news) - [MEET THE TEAM](https://www.polysales.com/about-us/) [CONTACT](https://www.polysales.com/contact-us/) Ask Denver # Why do we need self-levelers and moisture barriers today if we didn’t need them 20 years ago? A number of changes in the built environment have led to an increase in problematic subfloors. Some of these changes include changes in how concrete is manufactured such as the addition of chemical additives; changes in cement because the water ratio has been increased; power floating and fast-track building programmes. [Denver Coleman](https://info.polysales.com/news/author/denver-coleman) May 14, 2019 --- **With more than 50 years’ experience in the local and international flooring industry, Denver Coleman, Chairman of Polyflor SA, answers questions posed by installers, architects and readers. In this issue, he discusses the repercussions of modern building methods and environmental sustainability on sub-floor preparation.** **“There is a great deal of frustration and confusion as well as cost factor implications regarding adding a self-leveling screed and moisture barrier to the floor preparation for vinyl flooring installations. We didn’t experience the same issues 20 years ago. Why is it a problem today?” – Herman Kleingeld, Cape Town** ![Ask Denver Subcreeds](https://info.polysales.com/hs-fs/hubfs/Ask%20Denver%20Subcreeds.png?width=900&name=Ask%20Denver%20Subcreeds.png) Flooring manufacturers spend a lot of time, money and effort attending to problems with screeds, moisture and poor installation at no fault of their own products. The floor covering is actually only the decorative “icing on the top” but aesthetically dependent on good quality floor preparation. A number of changes in the built environment have led to an increase in problematic sub-floors. Some of these changes include changes in how concrete is manufactured such as the addition of chemical additives; changes in cement because the water ratio has been increased; power floating and fast-track building programmes. Each stakeholder involved in the project, from the engineer to the adhesive supplier, will have different reasons and motivations for potentially requiring a self-leveler and moisture barrier: **Structure specification (architect/engineer)** Changes in construction techniques, such as changes in types of surface beds and suspended slabs, have affected the way the structure is designed. While there are time, cost and environmental benefits for these structural changes, they also have an impact on the sub-floors that a flooring contractor has to work with. **Building and flooring contractor (contractor/sub-contractor)** While it is the building contractor’s legal responsibility to produce a screed that is sufficiently hard, smooth and flat, this has become somewhat difficult with today’s level of skill in the building industry.  It has therefore fallen to the flooring contractor to use self leveling products to ensure a Class 1 screed. Testing for moisture is the responsibility of the flooring contractor. With power floated screeds and fast tracked building, it is rare to find a screed that is sufficiently dry and does not require a moisture barrier, especially on ground floor surface beds. **Adhesive supplier** There have been changes in adhesive formulation to ensure the safety of installers and to meet stricter environmental requirements.   Adhesives now have far less solvents and are more water based thus more susceptible to moisture than the high solvent adhesives were. Therefore the use of a moisture barrier is often required in order to prevent moisture rising and emulsifying the adhesive. **Flooring material supplier** Whilst the formulation of vinyl floor coverings have changed little over the last 20 years, other than removing harmful or banned substances, the fast tracked building environment and lack of skills in the industry have led to more costly sub floor preparation. **Quantity Surveyor** A quantity surveyor will be in the best position to provide a financial overview of a complete floor installation and compare past installations to present-day ones. Everything from traditional building methods and adhesives to modern methods would need to be carefully weighed to determine the total financial cost savings. Are new sub-floor methods and products a cost saving?  Does fast tracked building also save costs? The question begs are vinyl floors really more expensive now or are the additional costs as a result of cost savings in other areas? Vinyl flooring installations require a very specific preparation and installation technique. Some points every flooring contractor needs to keep in mind when preparing for a vinyl installation are the following: - **The [screed](https://info.polysales.com/news/the-art-science-of-a-quality-screed-for-a-vinyl-installation) will become your problem.** You will ultimately be responsible for ensuring that the screed is sound, level and sufficiently dry before installing the vinyl flooring or you could jeopardise the success of the installation. - **Keep a R2 coin handy.** To ensure levelness, you shouldn’t be able to insert more than a R2 coin under the straight edge at any point along a 3m length of screed. - **Check moisture.** The Wagner meter or Protimeter are reputable tools that will enable you to read the moisture levels at the correct depth. Check readings in different areas because factors such as ventilation and ground conditions can have an impact on moisture readings. - **Use a self-leveler and [moisture barrier](https://info.polysales.com/news/moisture-testing-like-a-pro).** In order to mitigate any risks when installing vinyl flooring, it is always advisable to use a moisture barrier and self leveling product to ensure correct flooring preparation for a successful installation. --- *For more advice from our vinyl flooring specialists, why not download our latest eBook, **[Flooring contractor's guide: Developing and growing your business with vinyl flooring.](https://info.polysales.com/get-the-flooring-contractors-guide)*** --- For more insights like these **[sign up for Polyflor Insights ](https://info.polysales.com/subscribe-to-polyflor-insights)**and we will send useful tips and advice straight to your inbox. [![Subscribe to Insights](https://no-cache.hubspot.com/cta/default/2749413/14b040d1-754b-4175-aca2-fb060f8d9c74.png)](https://cta-redirect.hubspot.com/cta/redirect/2749413/14b040d1-754b-4175-aca2-fb060f8d9c74) [Ask Denver](https://info.polysales.com/news/topic/ask-denver) [Vinyl Flooring ins and outs](https://info.polysales.com/news/topic/vinyl-flooring-ins-and-outs) ## Similar posts Industry sector specific flooring ### [Meeting teacher and students needs for classroom floors](https://info.polysales.com/news/meeting-teacher-and-students-needsfor-classroom-floors) Vinyl ticks all the right boxes. Durable, soft and warm underfoot, waterproof, easy-to-clean, quiet and non-slippery, vinyl flooring provides all the... Tandy Coleman May 22, 2018 Vinyl Flooring ins and outs ### [Is your building making you sick?](https://info.polysales.com/news/is-your-building-making-you-sick) Sick building syndrome (SBS) is a medical condition where people in a building suffer from symptoms of illness or feel unwell for no apparent reason.... Prema Charnock Aug 28, 2018 Ask Denver ### [DISINFECTING VINYL FLOORS DURING COVID-19](https://info.polysales.com/news/disinfecting-vinyl-floors-during-covid-19) Denver Coleman, Chairman of Polyflor SA, provides guidelines on how Polyflor vinyl flooring can be disinfected during the COVID-19 outbreak to ensure... Denver Coleman Sep 15, 2020 ### Get insights and trade secrets from our team of experts, straight to your inbox. We would love to share our knowledge that we’ve gained from many collective years of experience within our team. ![Polysales_Logo_FullColour](https://info.polysales.com/hubfs/Polysales_Logo_FullColour.png) Polysales, specialists in a range of quality vinyl flooring and wall protection solutions, with an extensive fit-for-purpose range, built to last.  Dependable, consistent and reliable partner, who provide ethical and responsible advice honed from years of experience.  A values driven business you can trust with your reputation. ### Contact Details - T: 011 609 3500 - F: 086 609 8131 - [E: marketing@polysales.com](https://info.polysales.com/news/marketing@polysales.com) ### Address - 8B Buwbes Road North Sebenza 1609 - P O Box 3967 Edenvale 1610 Copyright © Polysales 2025. [Privacy Policy](https://www.polysales.com/privacy-policy/) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Denver Coleman", "url" : "https://info.polysales.com/news/author/denver-coleman" }, "dateModified" : "2020-02-27T09:50:45.234Z", "datePublished" : "2019-05-14T13:31:01.000Z", "headline" : "Why do we need self-levelers and moisture barriers today if we didn’t need them 20 years ago?", "image" : [ "https://info.polysales.com/hubfs/Ask%20Denver%20Subcreeds.png" ], "mainEntityOfPage" : { "@id" : "https://info.polysales.com/news/why-do-we-need-self-levellers-and-moisture-barriers-today-if-we-didnt-need-them-20-years-ago", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://info.polysales.com/hubfs/Polysales_Logo_stacked_Fullcolour-1.png" }, "name" : "Polysales" } } ```