Carpenter Midas 12mm Carpet Underlay


  • Our best selling underlay for use where insulation is your highest priority and comfort is key
  • Easy to fit on both concrete and wooden sub floors too.
  • Good sound reduction properties but not quite as high as the Deep Step 11mm (46db)
  • It’s woven top ensures unrivalled durability that’s guaranteed to last the lifetime of the carpet
  • Significantly increases the life of the carpet especially thinner ones
  • Easy to cut and handle for fitting yourself or being installed by a carpet fitter
  • 100% recycled and manufactured in Britain by Carpenters (trusted since 1948)


Committed to using top British manufacturers


  • Manufacturer : Carpenters
  • Thickness: 12mm
  • Roll Width: 1.37m
  • Roll Length: 11m
  • Thermal Resistance: 3.26tog
  • Sound Reduction: 41db
  • Density: 85kg/m3

Where should you fit Carpenters Midas 12mm insulated underlay?

The Midas 12mm thick underlay has an excellent tog rating of 3.3 tog (tog usually ranges from 0.7 to 3.3). So, it should be laid where insulation and warmth is the highest priority. For example where rooms have a cold concrete subfloor or where drafts flow through floorboards into the upstairs rooms.

This underlay can be fit on either wood or concrete subfloor.

It can be used in most areas of your property where you have carpet, bar from on the stairs. Between the 3.3tog and the 12mm thickness it makes a great choice for any homes that are naturally cold or get cold in the winter.

Not only does the high tog rating keep the warmth in, but it will also keep the room cooler during the hottest Summer days. That’s why it’s most suitable for areas of relaxation such as bedrooms, lounge, play rooms. This is because the underlay offers comfort and has good recovery characteristics.

The Midas 12mm feels softer underfoot than some of the higher density products, offering supreme comfort and warmth. It also has a woven top, which ensures a solid, stable protection for the carpet.

If you have chosen a thinner carpet then this underlay will help to ensure that you still have the luxurious feel under foot.

Ultimately, the Midas 12mm carpet underlay makes the floor better to walk on, can stop drafts and help you save on heating bills. It can even smooth out small imperfections in the subfloor.

Where shouldn’t you fit the Midas 12mm?

Midas 12mm is not suitable for the stairs due to its thickness. It’s also not suitable for use with underfloor heating due to its high thermal properties.

  • A thinner product, such as our Rich Step 9mm, would be best to use on your stairs.
  • For underfloor heating, you’ll want to choose a high conduction product such as our Duralay King

Made in the UK from 100% Recycled Materials

The Midas 12mm is made by Carpenters, a trusted manufacturer since 1948 based right here in the UK.

It’s constructed of 100% recycled PU Foam and has a medium density. It’s easy to cut with scissors and lightweight enough to handle round corners of the room – making it easy to fit it yourself or quicker for carpet fitters to complete the job – in comparison to rubber products.

PU Foam are now the most popular for a few reasons. They are light weight and easy to handle. They are also made out of recycled materials and more economical to produce, keeping things green.

Why trust Carpenters UK for quality and longevity?

They have simply stood the test of time. That’s because many unbranded underlay products are found to be of poor construction or will deteriorate in a much shorter period of time. If the underlay deteriorates, then the carpet will need lifting and a new underlay fitted earlier than desired.

They have been innovating in the home comforts sector since 1948. With Carpenters you can be sure that you’re buying the highest quality and the longest lasting products.

Some people feel the need to budget for a lower cost underlay but this is the component that offers the most benefits.

While the carpet is there to look and feel nice, the underlay is there for carpet protection, extra comfort and even insulation or sound reduction. Carpenters deliver on all of these.

At Underlay4u, we’re also committed to using British products that are recycled and manufactured right here in the UK.

In Summary

  • Fit where warmth is highest priority, often on cold concrete floors
  • Not suitable for stairs or where underfloor heating is installed
  • Constructed of 100% recycled PU Foam, making it easy to cut and handle
  • Choose Carpenters UK for quality, eco-friendliness and excellent durability, especially when compared to other unbranded underlays

If you place your order before 2pm you can choose next day. Our courier service is DX Freight. You will receive a text message and an email on the day of despatch confirming your delivery.

Additional information

Weight N/A
Square Meterage

1 Sq mtr, 5 Sq mtr, 10 Sq mtr, 15 Sq mtr, 20 Sq mtr, 25 Sq mtr, 30 Sq mtr, 35 Sq mtr, 40 Sq mtr, 45 Sq mtr, 50 Sq mtr, 55 Sq mtr, 60 Sq mtr, 65 Sq mtr, 70 Sq mtr, 75 Sq mtr, 80 Sq mtr, 85 Sq mtr, 90 Sq mtr, 95 Sq mtr, 100 Sq mtr



Sound Reduction



Very High


Off Stairs, Medium Use