Which underlay is best for insulation?

Author: Camren Quitzon  |  Last update: Tuesday, April 14, 2026

When it comes to finding the best underlayment for heated floors, you will find that cork underlayments are the best choice. While real cork can deliver amazing results for concrete floors, Eco Cork Foam is tailored to perform amazingly in any application.

What floor underlayment has the highest R-value?

DRICORE Insul-Armor is the most premium subfloor. With an R-value of 4.1, DRICORE Insul-Armor provides one of the highest R-values in the market, meaning maximum warmth and comfort for your family.

Does thick underlay make a room warmer?

Ball & Young supply underlay from 3mm all the way through to 11mm; the thicker the product, the more travel of compression there is, which makes the product feel more comfortable and gives better heat insulation.

What floor covering is best for insulation?

Basement flooring options that provide the best insulation include: cork, EVA foam, PVC, and plastic. With numerous suitable options manufactured using a variety of these materials, there is an option or flooring package for every price point.

What to put under carpet for insulation?

Foam underlay is a popular, affordable choice for insulation under carpet. It is made from polyurethane foam and is available in various thicknesses to suit different insulation needs.

Choosing the Best Underlay For Laminate & Wood Flooring

Can carpet underlay be used for insulation?

If you're searching for the best carpet underlay for insulation, whether it's thermal insulation or sound insulation, crumb rubber is an ideal underlay to lay in your property. Crumb rubber underlay is ideal because it has a dense, firm property that is designed to suit areas of high-traffic.

What goes under floor insulation?

For concrete floors, you need to remove all the flooring and lay a crate, on which the layer of insulation will be installed. Then it is necessary to install a layer of waterproof membrane, and a subfloor layer on it. Then you can install any finishing flooring of your choice.

What is the best underlayment for insulation?

Rubber is one of the best choices for underlayment because it is super versatile. It protects your floor from mold and mildew and protects your ears from hollow sounding floors. In fact, it is one of the most sound absorbing and insulating underlayments out there.

What is the gap between insulation and flooring?

When it comes to foil insulation, it's generally recommended to leave an air gap of at least 25mm (1 inch) between the foil layer and the surface it's installed on. This allows the foil to reflect radiant heat, rather than simply absorbing it.

What is the best floor covering for warmth?

Wool carpet is the most effective thermal insulator because wool fibres not only retain their pile height for longer (which is a key factor in retaining insulation) but also feel much warmer and comfier underfoot than other flooring types, helping to make you actually feel cosier too.

What is the best carpet underlay for insulation?

That's why, for most projects, we typically recommend the Plushwalk 12mm Carpet Underlay. This is the best thermal carpet underlay to date. It boasts an exceptionally high TOG rating of 3.5 and benefits from a 12mm thick, memory foam construction. It will make a huge difference to the temperature of the room.

Does it matter what underlay you use?

Your choice of carpet won't have a huge amount of influence on the type of underlay you need. However, if you've opted for a thinner carpet, you may want to choose a slightly thicker underlay. This will provide extra cushioning without compromising on the style of your carpet.

What is the best thickness of underlay?

So generally speaking 7mm is about as thin as you want to go unless you have a specialist need for something thinner, but 8-12mm is the band most manufacturers produce carpet underlay with and its perfect for any room and any carpet.

What is the thinnest insulation with the highest R-value?

Thermablok® Aerogel is a revolutionary advancement in thermal technology offering the thinnest insulation available to prevent thermal and cold bridging. Classed as a Super Insulation, Aerogel has the highest insulation value of any known material with the lowest thermal conductivity value of any solid (0.015W/mK).

Does floor underlayment provide insulation?

An underlay can also act as an insulator if you don't have underfloor heating. So, choosing a laminate underlay with a high tog rating will help your room retain more heat. This could help you save money on energy!

What is the best floor insulation?

If you are concern about compressive strength of the floor insulation material, you should consider buying XPS extruded polystyrene board with the highest compressive strength ranging from 300kPa to 800kPa, followed by PIR rigid insulation boards (150kPa) manufactured either by Kingspan, Celotex, Xtratherm, Iko- ...

Is it OK to put insulation between floor joists?

Insulating in between your floor joists is one of the best ways to upgrade your home comfort and energy efficiency.

Does insulation need an air gap?

Yes, an air gap between the roof and insulation is needed, especially for traditional materials like fibreglass, mineral wool, and foil insulation.

What is the best breathable insulation?

The best insulation materials to use are natural fibre insulations which will ensure that the whole structure will remain breathable. Pavatex Wood Fibre Wall Insulation systems work with the physics of moisture transfer rather than attempting to prevent it with the inclusion of vapour barriers.

How do I choose the right underlayment?

Choosing the right floor underlayment is critical, so we've outlined the top seven things to keep in mind during your research.
  1. Thickness. ...
  2. Compression Resistance. ...
  3. Noise Barrier. ...
  4. Moisture Wicking. ...
  5. Installation Process. ...
  6. Budget Considerations. ...
  7. Underfoot Feeling.

Does flooring underlayment have any R-value?

In addition to the STC and IIC ratings, some underlayments may also have a thermal rating, or R-value. This refers to the underlayment's ability to conduct heat. The higher an R-value is, the less heat will move through it.

What is the best flooring for R-value?

Carpet, particularly wool and shag varieties, provides the best R-values among all standard flooring choices. For example, wool carpet rates a maximum R-value of 2.1, while other types of carpet can rate as low as 0.7.

What type of insulation goes under floor?

Most homes with hardwood flooring use underlayment to add a layer of insulation between the subfloor and floor. So, materials that act as insulators, namely rigid foam, polyfoam, silicone, fiberglass, or rubber are used to keep the surface from getting cold in winter.

What thickness should floor insulation be?

Complying with building regulations

The U-value is a measure of how quickly heat will travel through the floor. To achieve this standard, you will normally need at least 70mm of high-performance foam insulation, or 150mm of mineral wool, but this will vary depending on floor type, shape and size.

Does floor insulation go shiny side up or down?

if it is hot outside, the reflective part of your foil insulation must face outside. if it is freezing outside, the best orientation of the reflective part is inside.

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