What is PU underlay made from
Ava Wright
Published Apr 20, 2026
PU Foam underlay is typically made from “trim”, which is the name for the unused waste generated from other PU users such as sofas or armchair cushions. These start out life as large PU blocks that are cut down to approximate sofa sizes.
What is PU underlay?
PU (polyurethane) foam underlay is now the most popular type of carpet underlay on the market – and it’s easy to understand why. Not only is it known for its luxurious and comfortable feel underfoot, it’s also lightweight and easy-to-handle and offers superb protection for your flooring.
Is PU foam underlay breathable?
Polyurethane mattresses The comfortable open-cell polyurethane foam is breathable and hard-wearing.
How long does PU underlay last?
designed to last for up to 25 years or more. But we guarantee, the older they get, the less effective they will become. No matter how luxurious or expensive the carpet, its overall finish will only be as good as the underlay – and, nine times out of ten, it’s a recommended and highly worthwhile investment.How is foam underlay made?
The used car tyres are ground and processed to produce tiny crumbs. These are mixed with latex foam, and the mixture is then poured on to various types of backing material and the gauge, or thickness of the underlay is set. The underlay is then passed through a large oven, heated up to 250˚c and then cured and cooled.
Is PU foam underlay any good?
The best type of underlay for carpet is PU foam. It is the best option due its many advantages over alternative types of underlay such as its strong heat insulation abilities and the soft underfoot it provides. However, sponge rubber is another solid option.
What is underlay made from?
Underlay or underlayment generally refers to a thin layer of cushioning made of materials such as sponge rubber, foam, felt, crumb rubber, or recycled plastic; this material is laid beneath carpeting to provide comfort underfoot, to reduce wear on the carpet, and to provide insulation against sound, moisture, and heat.
What is the thickest underlay you can buy?
At 12mm thick, this is the thickest underlay you can buy for use with carpets. The extra thickness is designed to provide a lovely, comfort feel throughout your home. It also offers significant protection to the life of your carpet.Can you reuse underlay?
Most of the time, you shouldn’t reuse old underlay. We recommend that you buy and fit new underlay at the same time as your new flooring. Old underlay can disintegrate as it ages, as well as harbour lots of dust and dirt. … The thicker the underlay, the more cushioned your floor will feel underfoot.
How often should you replace underlay?Carpet underlay, particularly rubber based products, can crumble and harbour dust and dirt. This dirt can transfer into your new carpet and make it look old and tired. When you think about it most people keep their carpet for at least 7 to 10 years so if you re-use your underlay it could be 20 years old!
Article first time published onHow thick is Axfelt underlay?
Axfelt underlay is 10mm thick with a 2.2 tog and sound insulation of 32dB and it is made from 100% recycled material, but it is not suitable for use with underfloor heating.
Is rubber underlay breathable?
Rubber or “rubber waffle” underlay This type of underlay is springy, durable and, because of its cellular construction, breathable. A relatively expensive option, it is often considered to be superior to other types of underlay.
Does rubber underlay smell?
Does the smell of rubber go away? Yes it does. QuietDown is manufactured using recycled rubber, which have an odour of rubber.
What is crumb rubber underlay?
Just as the name suggests, crumb rubber carpet underlay is made from small crumbs of rubber that are bonded together. The rubber is 100% recycled – taken from used car tyres – making it a good eco-friendly option. Crumb rubber underlay also has many useful properties.
Is rubber underlay toxic?
New Rubber and Foam Underlay Products As well as the damage done to the environment during their manufacture they slowly give toxins off over their lifetime, although the danger to our health from these isn’t conclusively proven.
What is the best underlay for wool carpets?
Felt underlay can be one of the best underlays for wool carpets if you’re considering them for areas like bedrooms, hallways or stairwells. This is because felt underlay provides a great level of comfort underfoot and will prevent the wool carpet from flattening out.
Is wool underlay any good?
Due to the high wool content this is one of the best performing insulating underlay with a 3.6 tog rating. … Wool felt is a traditional choice of underlay and, although not quite as cushioning an underlay as PU foam, it recovers well from furniture marks and won’t flatten over time.
Is 10mm underlay good?
Once you’ve decided on the best type of carpet underlay for your needs, the next step is to choose a thickness. … 10mm works well for stairways and extra thick carpets. However, in most cases, we recommend a 12mm underlay – as this tends to have the best properties overall.
What is the best carpet underlay 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 is the best underlay to use with laminate flooring?
Adding a damp proof membrane can trap moisture, subsequently damaging your laminate. And if your subfloor is made from plywood, a fibreboard or foam laminate underlay – without a vapour barrier – is usually a better option.
How thick should underlay be?
Popular manufacturers make underlay of around 11mm-12mm and this is ideal. However, thick underlay on the stairs can make it challenging to fit the underlay, so you must compromise on the comfort slightly. A 9mm underlay would be far easier to fit on the stairs rather than something as much as 12mm.
Can I reuse laminate underlay?
You can reuse old laminate flooring underlay, provided it’s still in good shape. Where you decide to reuse underlay, you should ensure that there are no rips and that it’s capable of covering the entirety of where you’re installing your laminate floor without any gaps.
Can you use your old carpet as underlay?
You can absolutely lay a throw rug on existing carpet to change the look and feel of the room without spending time, energy and money on a whole room reflooring. … This protects the carpet underneath, keeping that security deposit intact. There’s no need for a floor pad either; the carpet under the rug serves as padding.
Is 12mm underlay too thick?
How thick should a carpet underlay be? … 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 9-11mm being the most popular products.
What is the best underlay UK?
- Plushwalk 12mm: Best luxury carpet underlay for bedrooms. …
- Duralay Treadmore sponge waffle: Best carpet underlay for all rooms. …
- Wilsons Underlay Luxury Wool: Best natural, inexpensive all-room carpet underlay.
How thick should my carpet be?
A general rule of thumb for most residential carpet applications is to choose cushion no more than 7/16 inch thick and no less than 1/4 inch with 6 pounds per cubic feet density. If the carpet is a berber or a low profile carpet, choose a cushion no more than 3/8 inch thick with 8 pounds density.
How do I know if I need new underlay?
If you notice particularly flat or hard areas of carpet, there is a chance that the underlay needs replacing. It is the underlay that provides extra cushioning for your carpets and prolongs their natural life.
How do you know if you need underlay?
If you wood subfloor is pretty sturdy, you won’t need any special underlayment. If your subfloor is a little uneven or creaky, you may want to get a premium underlayment that has noise reduction and cushion capabilities.
Does carpet underlay absorb moisture?
Carpet padding is like a sponge and will absorb a lot of water, but it will not dry out. So, if you were to reuse the padding, it will be damp and begin to mildew, grow mold and smell under the carpeting.
Who makes Axfelt underlay?
Axfelt acquired. Ulster Carpets has stepped in to acquire the Axfelt sustainable underlay business from Axminster Carpets, securing some jobs in Devon where production will continue while Axminster resolves its own wider future following financial issues at the firm.
What is Axfelt underlay?
Axfelt Triple Layered Underlay is a luxury underlay with a wool felt topping, mixed material middle layer and a rubber crumb bottom layer. It provides excellent foundations for your new carpet to help prevent wear and tear, increasing the life of the carpet and maintaining its looks.