How important is carpet underlay?

Author: Sienna Lockman  |  Last update: Thursday, July 2, 2026

Why is underlay important? Underlay isn't just crucial for comfort underfoot, but it also drastically helps maintain your carpet as well as providing extra protection against moisture. It is also a great shock absorber, meaning it's ideal for reducing noise from things like footsteps, voices or moving furniture.

Is carpet ok without underlay?

Whilst it is possible to install carpets without underlay, the absence of underlay can compromise the comfort, durability, and performance of the carpet over time.

What happens if you don't use underlay?

It smooths out the subfloor

If you have areas in your subfloor that are bumpy, uneven or rough, laying carpet directly on it will lead to uneven wear and significantly shorten its lifespan. By installing underlay first you negate a lot of these imperfections, keeping your carpet looking its best for longer.

What happens if you don't put padding under carpet?

A carpet is essentially just fiber woven together. Without padding, the backing will break. Once this happens, the carpet starts to age.

Is it worth paying more for underlay?

It's worth paying for good underlay. The carpet feels much softer underfoot, you get better sound and heat insulation and most importantly the carpet will last much longer. A carpet without underlay (unless a very cheap carpet with its own bonded rubber/felt backing) is a waste of money.

Getting Technical: Choosing Underlay

Does carpet underlay make a difference?

Depending on the type of floor you are laying carpet on, underlay can provide extra protection against moisture. It also protects your carpet from constant footfall and resulting wear and tear over time, helping to keep your carpet looking better for longer.

How much should I pay for carpet underlay?

Underlay per square meter should cost you between £3 and £8 per square meter, including delivery. The actual price per square metre depends on a number of variables, but you should expect to see prices per square meter of underlay that range between £3 and £8.

Is a 10 lb carpet pad worth it?

The lighter density pad, 4 or 6lb will be cushy but not withstand traffic for years to come. And on the opposite spectrum, a 10lb will be durable but is very firm underfoot. The 8lb, 7/16” rebond pad is our most popular pad. It is a fantastic value, performs well and is very comfortable!

Does carpet padding ruin hardwood floors?

Poor-quality rug pads trap oil, dirt, debris, and dust, resulting in hardwood floor discoloration and scratching over time. High-quality rug pads don't damage the flooring; they reduce wear and tear.

Do you have to staple carpet underlay?

Do you need to staple down underlay? To ensure that the underlay is secure and stays in place, you should staple down the underlay or use an adhesive to glue it down into place.

Do you really need underlay?

In short, yes! We always recommend that you install underlay under your carpet. It has a multitude of benefits including improving the look and feel of your carpet, increased comfort levels, reducing noise, increasing energy efficiency and improving the lifespan of your carpet.

Can I skip underlayment?

Underlayment is necessary to provide a moisture protection, sound insulation, and a smoother surface for the laminate. Installing laminate directly on the subfloor can lead to noise issues, discomfort, and potential damage from moisture.

How long does carpet 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.

What carpets don t need underlay?

Felt backed carpets are typically easier to install than other backing types, making them ideal for those going with DIY installation. Felt carpets can also be used without the need for additional underlay, which is ideal if looking to refit the home with an affordable, cheap carpet solution.

Can I use my old carpet as underlay?

His answer has always been, and will always be, ABSOLUTELY NOT! Underlay has properties which make it perfect for laying underneath the carpet, and normal carpet does not have these properties. Firstly, the installation may fail as the gripper rods can't grip through the old carpet as well as the new.

What is the best thickness for carpet underlay?

If you've opted for a thinner carpet, you may want to choose a slightly thicker underlay. Popular manufacturers make underlay of around 11mm-12mm and this is ideal. Although for more difficult areas like stairs, a 9mm underlay would be far easier to fit, rather than something as much as 12mm.

Can you put a rug directly on a hardwood floor?

Natural Rubber or Latex Backed Rugs: Rugs with a natural rubber or latex backing are non-slip and will provide a secure grip on hardwood floors without causing damage.

What happens if I don't use a rug pad?

A rug slightly softens up a portion of the floor. However, a rug without a pad can result in sliding, bunching, knotting, and wrinkling.

Is padding in carpet worth it?

For starters, a carpet pad works to not only make the actual carpet more comfortable to walk on but will also increase the lifespan of your carpet. In fact, a luxurious carpet pile won't remain that way for long without a carpet pad under it.

What lb carpet pad is best?

The density of a carpet pad's foam is measured by pounds per cubic foot. For good comfort and durability, experts recommend a foam in the 6 pound to 8 pound range. The denser it is, the longer and better the pad will hold up.

What is the best carpet underlay to use?

Foam underlay – Typically made of PU foam, this is one of the most versatile types of underlay. It's soft and lightweight as well as being good for insulation and noise reduction. Foam is also a very easy underlay to fit, making it fantastic for difficult areas like staircases or hallways.

Is 50 oz carpet a good carpet?

A good face weight for a carpet ranges from 40 ounces to 60 ounces per square yard for high-traffic areas like living rooms, dining rooms, entryways, and hallways. A good face weight for low-traffic areas, such as a bedroom, home office, or den, ranges from 30 ounces to 50 ounces per square yard.

What is a good price to pay for carpet?

Good quality versions are $1.50 per square foot and up. Professional installation adds $0.50 to $1.50 per square foot. The average cost of new carpet installed $2 to $9 per square foot, according to HomeGuide data. To carpet a 16x20-foot room (320 square feet), figure on paying $640 to $2,880.

Is underlay necessary for carpet?

Too much rubbing will cause the carpet to deteriorate, lose it's colour and eventually your hard-earned money will be lost. This means, that installing an underlay is an essential part of installing a new floor, whether the chosen material is laminate or wood.

Is it worth replacing carpet underlay?

Trust us, underlay is well worth the investment. Equally manufacturers warranties may be invalidated if new underlay is not fitted with the new carpet. So when your retailer asks if you need new underlay with your new carpet, the answer should always be yes!

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