What is the best underlay on the market?

Author: Dr. Sammy Hegmann Jr.  |  Last update: Wednesday, February 11, 2026

Polyurethane (PU) foam carpet underlay - PU foam as a material is very popular and versatile, extensively used for both carpet and laminate flooring. It is the most popular (and cost-effective) due to the lovely cushioned feeling it provides underfoot.

What is the best type of underlay?

A high-quality PU foam underlay is an excellent choice, as it offers superior cushioning, creating a soft and luxurious feel underfoot. It also provides brilliant insulation, keeping your living room warm and comfortable, especially during colder months.

Which underlayment is best?

Rubber is a strong material that many prefer for underlayment. It is a popular choice due to its properties like cushioning, sound absorption and moisture resistance.

What is the best thickness for underlayment?

Other factors like type, sound ratings, and density matter just as much, if not more than the thickness. With that being said, most underlayments are 2-3mm thick, but are sometimes thicker for carpet or to smooth out an uneven subfloor.

Is higher density underlay better?

Density plays a role in both comfort and durability. Higher-density underlay tends to be more resilient and durable, as it can better withstand the pressure and weight placed on the flooring surface. It offers improved support and helps prevent premature wear and tear of the floor covering.

Underlay - Why is it important to source the best possible?

How thick is good underlay?

9-10mm carpet underlays are usually good all-rounders that can be installed in all areas of the home, including stairs and hallways.

Is expensive underlayment worth it?

The high cost of synthetic underlayment is due to its superior material strength and long lifespan compared to felt or asphalt paper underlayment. While the initial investment may be higher, synthetic underlayment can save you money in the long run by lasting longer and requiring fewer repairs or replacements.

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.

Can you have too much underlayment?

More is not always better, and with underlayment, too much can compromise the integrity of your floor's locking system. Adding additional underlayment under vinyl with an attached pad can create too much cushioning, which causes the floor to come apart through use over time.

What is the difference between 15 and 30 underlayment?

Felt underlayment is the older of the two and comes in 15 lb and 30 lb rolls. The big difference between the two types of felt underlayment is that 30 lb is thicker, stronger, and less likely to tear than 15 lb.

What is premium underlayment?

Underlayment is a layer of material installed beneath the floor covering that aims to protect the flooring system. A premium underlayment acts as a barrier that dampens sound and protects the floor from moisture.

Which is better felt or synthetic underlayment?

Because it's made of plastic, synthetic underlayment is typically resistant to mold growth, a definite advantage over felt.

Is foam or rubber underlay better?

PU foam underlay, now used largely as the industry standard in UK homes, offers much greater heat and sound insulation than its rubber alternatives, thanks to its dense, soft nature. It's this same softness that makes it so comfortable underfoot too.

What is the best underlayment to use?

A thin foam underlayment made of polyethylene or polypropylene usually works best. If you have an attached pad laminate or vinyl floor, our recommendation is the Sentinel Protect Plus Underlayment.

How expensive is underlay?

What is the average price of underlay? The price of carpet underlay is calculated per m2 and – dependent on the supplier and the quality of the product – you can expect to pay anywhere between £2-£8. The more luxurious the underlay, and the better its overall performance, the more it will cost.

How long does underlay last?

Underlay can last anywhere between 5 and 20 years. Foam and Felt underlay can last up to 8-12 years. However, if foam underlay isn't properly installed or maintained, it lasts only 5 years. Acoustic and rubber underlay have the longest lifespan, lasting 10-20 years.

Can you have too much underlay?

Too much padding can make the floor too bouncy, which strains the laminate's locking system. If you are fitting a laminate floor with a pre-attached underlay to concrete though, it's a good idea to install a vapour barrier as well. This will help prevent moisture damage.

What happens if you don't put a moisture barrier under vinyl flooring?

When moisture penetrates your flooring, it can cause mold, mildew, and the potential for water damage. A moisture barrier helps control the water vapor's movement to help protect your floors. Therefore, if you're installing floors in an area that sees moisture, even a little, a vapor barrier is needed.

Can I put two layers of underlayment?

Adding two layers of underlay can result in floor instability, cause the boards to bend, and weaken the locking system that holds the flooring in place. This instability can lead to damage over time and might void the manufacturer's warranty.

What thickness underlay is best for laminate flooring?

Those around the 3-5mm mark are a great budget-friendly option and they will make a difference to the look and feel of your laminate. But they don't offer the same performance as a thicker underlay. For the best results, it's better to invest in a laminate flooring underlay measuring 6mm or more.

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).

What is the most common type of vinyl floor underlayment?

Felt is a popular underlayment choice, offering better sound control than foam and a variety of uses. It provides better insulation and has the option to include an attached vapor barrier, making it ideal for concrete subfloors and roofs.

Is it worth buying expensive underlay?

It may seem wasteful to spend hard-earned cash on something that won't even be seen. But no matter how small your budget, don't be tempted to pass on the underlay. Yes, it's a hidden layer, but it offers many useful benefits. Without it, you will notice a big difference in the final look and feel of your carpet.

What do roofers use for underlayment?

There are three basic types of underlayment used beneath roofing materials: asphalt-saturated felt; rubberized asphalt; and. non-bitumen synthetic.

What is the average cost for installing underlayment?

Roof underlayment replacement costs around $3,300 on average, but your total could fall anywhere between $300 and $8,200, depending on roof size and pitch, the type of underlayment you install, and some other factors.

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