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What’s the Right Underlayment for Vinyl Flooring Laid on Concrete?

You've decided to put vinyl flooring on concrete, but you're wondering if you need underlayment? The answer is yes, in most cases, it's essential for a durable and comfortable result.

Concrete, although extremely strong, is also hard and can get cold if not properly insulated. Laying vinyl directly on an unprotected surface can cause moisture and insulation problems. This is where underlayment makes a big difference!

The role of underlayment and the challenges of working with concrete

In Quebec, concrete slabs as a foundation pose challenges. In new builds, the ground is usually prepared with a layer of sand or rock, then covered with insulation and a vapour barrier to block moisture before pouring the concrete slab.

If you don't know the health of your foundation, (how it was built, or what type of concrete was used) it's best to use underlayment. Laying vinyl directly on concrete exposes you to greater risks.

This is where underlayment comes in, playing a vital role in the performance of your vinyl floor, including:

  • Boosting comfort: it adds cushioning that makes walking more pleasant compared to the hardness of concrete.
  • Protecting against moisture: concrete is porous and can let moisture through. Good underlayment acts as a protective barrier.
  • Reducing impact noise: underlayment absorbs footsteps and improves the sound quality of the room.
  • Providing thermal insulation: poorly insulated concrete conducts cold, especially in winter. Underlayment can improve the room's thermal insulation.

In terms of materials, you have a lot of options. Some are made from recycled fibres or polyurethane, while others use foam rubber or granules, often made from recycled tires. There are also wool felt underlayments.

A cozy living room with a vinyl floor installed on underlayment
A cozy kitchen with a vinyl floor with underlayment

The right kind of underlayment

Not all underlayments are created equal, especially for vinyl. This flooring often needs denser underlayment than hardwood or laminate.

To prevent it from bouncing when you walk on it or wearing down your flooring faster, make sure to check the compatible models.

There are underlayments specially designed for vinyl - whether it's glued, floating or click-installed.

What width of underlayment to choose?

It depends on the size of your room! For a narrow hallway, a 3-foot wide underlayment will do just fine.

However, if you're laying vinyl in a large living room, opt for a 6-foot wide one. There will be fewer joints to make, and the installation will be easier. And if you have multiple rooms to cover, choose a wider roll.

Minimum thickness: a detail that matters

Vinyl thickness is an important factor to consider. To avoid problems, choose a vinyl at least 1.5 mm to 2 mm thick. If the vinyl is too thin, it can create a "big cushion" effect that could damage the flooring.

However, if you have a vinyl plank that's 5 mm or thicker, you may not need a special vinyl underlayment. More classic models will do.

Installation on a heated floor

If you have a heated floor, no problem! Whether it's electric or hydraulic, most manufacturers offer solutions that are compatible. Just check the specifications before you buy.

A cozy bedroom with a heated floor

Soundproof underlayment: Is it really necessary?

Not all underlayments are soundproof, and depending on the room, it's not always a priority. What often matters most is moisture protection, especially in environments like basements.

Knowing this, if soundproofing is an important criterion for you, there are solutions specifically designed for this purpose.

Be sure to prioritize your needs based on the room before investing in this type of underlayment.

What if your vinyl already has an integrated underlayment?

Some vinyl models already include an integrated underlayment. At first glance, it's a pretty practical all-in-one solution, but be careful! These underlayments are not designed to reduce noise.

They're mainly there to provide moisture protection. If you're looking to acoustically insulate a room, you'll need to add underlayment.

A room with an integrated underlayment

Conclusion

So, which underlayment to choose? It all depends on your situation. If you're installing vinyl on a concrete subfloor in a basement, focus on moisture resistance. Ask yourself if you really need acoustic insulation. Then, for a heated floor, make sure the underlayment is compatible.

If you want to discuss your options, don't hesitate to contact us!

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