Underlayment for Vinyl Sheet Flooring: Your Ultimate Guide

What is vinyl sheet flooring?

Vinyl flooring refers to the flooring produced with PVC materials. Specifically, it is produced by taking polyvinyl chloride and its copolymer resin as the main raw material, adding fillers, plasticizers, stabilizers, colorants and other auxiliary materials on sheet continuous substrate through coating process or calendering, extrusion or extrusion process

Vinyl sheet flooring is the vinyl flooring in sheet or roll. 

What is flooring underlayment?

Underlayment is basically a thin layer of material sandwiched between other materials. The flooring underlayment is a thin layer of material, such as fiber, felt, rubber, self leveling cement or foam. It helps to cushion, absorb sound, insulate heat, reduce the wear of the floor and strongly improve the installation quality.

Do I need underlayment for vinyl sheet flooring? This is the question we often hear people ask. There are many articles to explain whether you need underlayment for vinyl flooring (mainly vinyl tile, vinyl plan, WPC and SPC), but you won’t find any article of underlayment for vinyl sheet flooring.

The answer is: YES you need underlayment for vinyl sheet flooring if it is not under below 2 conditions:

  1. You will lay vinyl sheet on good quality cement self leveling flooring or epoxy flooring.
  2. You are not asking for very good installation quality of vinyl sheet, and you only need to use it for a short time such as couple months.

In this article, we will give you ultimate guide why you need underlayment.

 It’s an in-depth article that takes 20 minutes to read.

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Underlayment for Vinyl Sheet Flooring: Your Ultimate Guide

1) Why underlayment is needed for vinyl sheet flooring installation?

Unlike other vinyl floorings, you can use fiber, cork, felt, rubber and foam for underlayment. Normally self leveling will be the only underlayment we are talking about for vinyl sheet flooring.

Self leveling is a ground construction technology. It is a liquid substance mixed with a variety of materials and water. After pouring into the ground, this substance can flow according to the uneven situation of the ground and level the ground automatically

Vinyl sheet flooring is a kind of soft floor material with a thickness of 2mm to 5mm, which has high requirements for the ground. Therefore, if Vinyl sheet flooring is laid on the ground that is not flat or fails to meet the requirements, it will cause hollowing and bubbling of the floor, ups and downs of the ground, directly affect the pavement quality and appearance, and completely fail to play the unique decorative effect of sheet vinyl flooring. After the self leveling is poured into the ground, the strength and smoothness of the ground can be increased, so that the ground can be adhered to the sheet vinyl flooring to the greatest extent and compactly after brushing glue. In this way, the final Vinyl sheet flooring installation effect will be very good, and it can even be used for more than 30 years without installation quality problems.

Of course, some people feel that their floor is very flat, so they don’t need to do self leveling, which can reduce one process. Of course, this statement is correct, so we just said at the beginning that if you install the Vinyl sheet on the self leveling or self leveling epoxy flooring with very good quality, this can be installed directly. Because the underlay of sheet vinyl itself is self leveling, it is no longer necessary to add an additional underlay after having a high-quality and qualified underlay.

However, if the existing self leveling and epoxy flooding are damaged, for example, they are not particularly flat, or there are cracks in some places, we need to repair them at this time. For example, repair the cracks and level the uneven places with self leveling. What’s more, if the damage of self leveling and epoxy flooding is so serious that it can’t be repaired, we need to make a self leveling again. This will solve the problem well.

In addition, for wood flooring, cork flooring, vinyl flooring, rubber flooring, plastic flooring, bamboo flooring and carpet, we suggest that all these places be removed, cleaned, self leveled, and then paved with Vinyl sheet flooring. Because if these floors have a function of underlaying in the middle seat, it may affect the installation quality of the final installation, shorten the service life of the Vinyl sheet flooring, and may be uneven in a relatively short time.

For those floor tiles or vitrified tiles that look very flat, we still need to do self leveling. First, we often look very flat, but in fact, their flatness cannot reach the level of self leveling. Second, there are gaps between the floors, which will undoubtedly affect the installation quality of the final installation. Make the service life of PVC flooring shorter and will become very unsightly. After self leveling is done on these floor tiles, the quality of sheet vinyl installation will be guaranteed.

2) Self leveling construction

Self leveling construction – priming

  1. The absorbent base course, such as concrete and cement mortar leveling course, shall be sealed and primed with multi-purpose interface treatment agent diluted with water in the ratio of 1:1.
  1. For non absorbent base course, such as ceramic tile, terrazzo, marble, etc., it is recommended to use dense interface treatment agent for priming.
  1. If the moisture content of the base course is too high (> 3%) and needs to be constructed immediately, epoxy interface treatment agent can be used for priming treatment, but the premise is that the moisture content of the base course shall not be greater than 8%.
  1. The construction of interface treatment agent shall be uniform without obvious effusion. After the surface of the interface treatment agent is air dried, the next self leveling construction can be carried out.

Self leveling construction – mixing

  1. Pour a bag of self leveling into the mixing bucket containing clean water according to the specified water cement ratio, and mix while dumping.
  1. In order to ensure uniform self leveling mixing, a high-power, low-speed electric drill with a special mixer must be used for mixing.
  1. Stir until there is no caking uniform slurry, let it stand and mature for about 3 minutes, and then stir briefly once.
  1. The amount of water added shall be in strict accordance with the water cement ratio (please refer to the corresponding self leveling instructions). Too little water will affect liquidity. Too much will reduce the strength after curing.

Self leveling construction – laying

  1. Dump the mixed self leveling slurry on the construction floor, which will flow and level the ground by itself. If the design thickness is ≤ mm, it needs to be scraped slightly with the help of a special tooth scraper.
  1. Then, the construction personnel shall put on special spiked shoes and enter the construction ground, roll gently on the self leveling surface with a special self leveling air release drum, and release the air mixed in the mixing to avoid bubble pockmarked surface and interface height difference.
  1. After construction, please close the site immediately, prohibit walking within 5 hours, avoid heavy object impact within 10 hours, and lay vinyl floor after 24 hours.
  1. For winter construction, the floor shall be laid 48 hours after self leveling construction.
  1. If it is necessary to carry out fine grinding and polishing for self leveling, it should be carried out after self leveling and drying.
Self leveling for vinyl sheet flooring installation
self leveling for vinyl sheet flooring

Vinyl sheet flooring applications

As you may know, normally vinyl sheet flooring is install for commercial applications, and these places are need very long life circle such as 10-30 years. So we will not only need to use the best vinyl sheet flooring, but we will need to guarantee that the installation quality is good. We can only have a very good quality vinyl sheet flooring after we get above both well done. 

Vinyl sheet flooring applications:

Heterogeneous Star Elegance commercial vinyl sheet flooring
Vinyl sheet flooring for kindergarten
Homogeneous vinyl sheet pvc flooring commercial sheet vinyl
Homogeneous hospital vinyl sheet flooring roll 3

This article is written by Longda Flooring (www.longdaflooring.com), a leading vinyl sheet flooring manufacturer from China. 

Please contact Longda flooring for a free quote on your vinyl flooring needs. We have quick response, efficient communication, quality products, on time delivery, and competitive price.

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