How to achieve a 0.18 U-value for solid walls

Are you going through building regulations for an upcoming project? You’ve likely been asked to achieve a 0.18 U-value for your walls if you are seeking acceptance from building control. Hitting this figure can be straightforward, however, can be much more difficult with cost and space restraints.

YBS SuperQuilt

Understanding U-values

U-values measure the level of heat transfer through a structure. It is a sum of all the layer’s thermal R-values (thermal resistance) that makes up that part of the building. For example, a roof has a U-value, a window has a U-value, and so on.

Achieving a U-value is often crucial, as there is a minimum expectation to achieve building regulations.

The U-value target for 2024

The government has updated its Approved Document Part L about U-values, heat gain, and heat loss. The new target U-value came into play in June 2022. For more information on Part L follow the link on the UK government website – See Data Source.

New for 2023 – U-value requirements for existing dwellings

Application Current U-value
Roof (Flat Roofs & Pitched Roofs) 0.15
Wall 0.18
Floor 0.18

Types of solid walls

There are many different terms and expressions used in the building trade, often relating to the same thing. Solid walls, often being branded as Dry Lining, include the following types of walls;

  • Cavity wall – Brick and Block
  • Concrete walls
  • Block and Render walls
  • Brick walls

The type of wall may affect the U-value achieved negatively or positively, for clarification, feel free to contact us or request a U-value.

Products to achieve a 0.18 U-value

Here at Ecohome Insulation, the product we’d highly recommend for insulating solid walls is YBS SuperQuilt. SuperQuilt is a thin flexible and extremely high performing for its thickness (40mm relaxed, 7mm compressed).

Here are some of the key benefits of YBS SuperQuilt

  • Built-in vapour control layer
  • Fully certified – BBA & BDA
  • Itch-free and floating fibre free
  • UK manufactured
  • Made from 83% recycled materials
  • Class E surface spread of flame

One of the main key benefits of YBS SuperQuilt is that in brick and block walls it can be used without any Rigid PIR Insulation such as Celotex or Kingspan.

How to install YBS SuperQuilt for 0.18 U-value

To achieve this popular U-value we recommend using a double layer of YBS SuperQuilt. This detail will provide incredible cost savings vs insulated plasterboard, and it’s a proven space saver.

  • Build-up from External to Internal
  • Solid Wall – E.g. Brick, Block, Stone
  • 25mm Vertical Batten
  • 1st Layer SuperQuilt stapled taut to battens (7mm compressed)
  • 38mm Horizontal Batten
  • 2nd Layer SuperQuilt staples taut to battens (7mm compressed)
  • 25mm Vertical Batten
  • Standard 12.5mm Plasterboard Finish
  • U-value Achieved – 0.18 U-value
  • Total space lost, from internal wall to finished plasterboard = 114.5mm

How to achieve a 0.18 U-value on Walls

Double Layer SuperQuilt on Solid Walls – To achieve 0.18 U-value

Do you require approval from Building Control?

Download the proposed detail for 0.18 using SuperQuilt from another of our websites Multifoils Direct for free! We recommend downloading the above bespoke calculation from the Online U-value Calculator. After answering a few straightforward questions, you’ll receive over your bespoke calculations in PDF format by email, to be forwarded over to your building control officer for acceptance.

We have many solutions for using SuperQuilt with Timber Frames as well as Dwarf walls.

Multifoils Direct also has over 1,000 U-value calculations for a range of applications including roofs as well as floors. So if you’re looking to renovate a property, or build a new home, there is a solution for you!

Are you having any issues finding the correct calculation for your project? if you are please request a U-value on our Contact Form! Once the form is complete, a member of our helpful team will email over a bespoke specification alongside a quote at our lowest trade prices.

Delivery Schedule

Here at Ecohome Insulation, we offer SuperQuilt at the lowest trade process, with FREE next working day delivery on orders over £100 excluding VAT. (UK mainland) only on orders placed before 2 pm.

Follow the links below to order YBS SuperQuilt online

SuperQuilt Loose Rolls – Click Here!

SuperQuilt Trade Pallet – Click Here!


All build-ups and suggestions are provided in good faith. Our recommended details should be double-checked with building control before committing to a purchase. The U-value table is a guide, and your desired target U-value is to be advised by your building inspector. Please check the calculations for correct air gaps and battens. Multifoils-Direct cannot be held responsible for any losses financially or physically from advice provided on this webpage