How do you stop moisture under vinyl flooring?

Author: Harvey Haag DDS  |  Last update: Monday, September 11, 2023

A moisture barrier, also known as a floor vapor barrier, is typically a sheet of plastic that slows moisture from moving through a wall or subfloor. It is placed beneath the floor's underlayment, especially in areas that are prone to moisture such as the bathroom and kitchen.

Should I put a moisture barrier under vinyl flooring?

We recommend for you to read the flooring installation instructions for proper installation. 95% of the time, they will recommend a 6-mil vapor barrier to be installed underneath the flooring.

Will water evaporate under vinyl flooring?

Water and moisture that is trapped under the floor will not evaporate on its own so you'll need to determine if the subfloor is affected and if removal of all or part of the floor is necessary to prevent subfloor damage and any mildewing.

Will water under vinyl dry out?

However, in the event of flooding or a bad sewage leak, standing water beneath vinyl plank flooring won't dry out on its own due to too much condensation that has collected between the vinyl planks and substrate or underlayment.

What causes moisture under vinyl flooring?

It's all caused because of the low vapor permeability of the LVF material combined with the building methods that allow for the presence of condensation buildup due to the transfer of humid air from warm to much cooler surfaces such as luxury vinyl flooring.

What can I do about moisture buildup under vinyl floor?

Will mold grow under vinyl flooring?

Yes, mold can grow under vinyl flooring if moisture becomes trapped underneath the flooring material. Vinyl flooring is not a breathable material, which means that moisture cannot escape through the flooring.

How do you dry water under flooring?

Place the fans at the highest settings possible. If there is a level below the flooring that can be accessed, place fans on the lower level and aim the air up toward the ceiling to dry the subfloor and flooring from underneath.

Do you need waterproofing under vinyl?

“Welded joints to vinyl are waterproof, therefore the whole flooring is a waterproof thing.” “Commercial grade vinyl doesn't require waterproofing.”

How do you remove moisture from a subfloor?

Sweep off, suck up, or drain away surface moisture.

Use a push broom to sweep away any small puddles that have collected on the subfloor surface. If there are larger or more numerous puddles, use a wet-dry vacuum to suck up the water. Work quickly to remove the water from the OSB before it soaks in.

What happens if water gets under luxury vinyl plank flooring?

Understand that while the water will not cause permanent damage to the LVT flooring, the subflooring, walls and baseboards do require drying, and if left unaddressed, will eventually damage the LVT. At Water Mold Fire Restoration we have the specialized equipment on hand to handle water damage to LVT flooring.

How do you check for moisture under flooring?

One of the fastest ways to pinpoint pockets of excess moisture in flooring is to use a flooring moisture meter to test the floor.

What if there is a small amount of water under laminate flooring?

When the water reaches under laminate flooring, the water must be removed immediately. If a small amount of water has leaked toward the edges of the flooring, pull up any quarter-round (shoe molding) or baseboards around the perimeter. If the water is not pervasive, you may be able to extract it with a wet-dry vacuum.

What is best to put under vinyl flooring?

Cork: Cork absorbs sound, which is why it is the most preferred material to be put under the vinyl floor.

What is the difference between a moisture barrier and a vapor barrier?

Moisture barriers are usually installed on the warm side of the wall. In warm climates the vapor barrier is placed on the exterior, while in colder climates the vapor barrier is placed on the interior, to prevent water and vapor from entering the wall cavity.

Should I put something under my vinyl flooring?

If your planks already have a pad-attached underlayment, you most likely won't need an underlayment. However, if your flooring manufacturers installation instructions allow for an extra underlayment, adding an extra underlayment will provide improved sound reduction, insulation, and moisture protection.

Can vinyl plank flooring be installed directly on concrete?

Yes, vinyl plank flooring can be installed directly on concrete as long as the surface is clean and level. It is important to note that some manufacturers may require the use of a moisture barrier or adhesive during installation on concrete.

Do you need to put plywood under vinyl flooring?

Before doing the installation, you must ensure that the floor beneath is swept clean. Sheet Vinyl flooring works best with plywood because it is easy to install and has an impressive level of water resistance. Also, plywood will help you save money in the long run because you won't have to do repair time and again.

Is vinyl flooring OK for bathrooms?

Vinyl is a standout choice for bathroom flooring. There are several different vinyl products, including luxury vinyl tile (LVT) and vinyl roll (also known as sheet vinyl), and both of these are excellent bathroom flooring choices. They're durable, moisture-resistant, easy to clean and maintain, and warm underfoot.

How long does it take for mold to grow under laminate flooring?

How Long Does It Take for Mold to Grow Under Wet Laminate? It only takes as little as 24 hours for mold to start growing under wet laminate flooring, if the water is dirty, it has come from a dishwasher, outside groundwater, a toilet or dirty carpet it can start growing bacteria even quicker, in as little as 12 hours.

What happens if water gets under flooring?

When water gets trapped under the boards, it creates a dark, moist environment that's ideal for the growth of mold. Eventually, this mold will creep upwards from the sub-floor to the top of the surfacing. At this point, without a doubt, you'll need a new flooring installation.

Is water under floor a problem?

Yes, very much so. A slab leak can cause potentially catastrophic damage to your home. In mild cases, a slab leak can leave a pesky wet spot in your home, but even this is bad news. The constant moisture and organic matter in your flooring can cause mold colonies to take root and spread quickly.

How can you tell if mold is under vinyl flooring?

Water stains can be an indicator of the presence of mold, as mold growth is often a result of water damage. So, if you spot them on your flooring, then it's likely mold is growing behind them. Look out for yellow or brown coloration.

Can water ruin vinyl flooring?

Luxury vinyl planks (or tiles) are, in themselves, completely water-proof and cannot be damaged by exposure to moisture. For that reason they are an excellent choice for laundry rooms, bathrooms, kitchens and other areas where moisture is around.

How do you dry water under laminate flooring?

The best solution is to use purpose-built dehumidifiers. They will assist in removing any moisture from the air and will also assist in removing any water from underneath your laminate flooring.

Previous article
How do I know if my lawn is over fertilized?
Next article
How often should houseplants be repotted?