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Internal Wall Solutions

A range of internal wall insulation systems suitable for solid properties

What is solid wall insulation?

Most modern homes are built with cavity walls, which are made from two layers with a gap in between, however many homes in the UK, especially those built before 1920, were built with solid walls.

You can often work out what type of walls you have by the external brickwork on your home.  If your home has cavity walls, the brickwork will usually have a regular pattern, all laid lengthways. However, if your home has solid walls, you will usually see an alternating pattern on the brickwork where bricks are laid lengthways then widthways then lengthways and so on.

This alternating brickwork is because, unlike cavity walls, solid wall homes do not have a gap in between layers. This results in substantial heat loss and low energy efficiency for the home. It has been estimated by the Energy Saving Trust that solid wall homes lose twice as much heat through the walls as cavity wall homes, so investing in solid wall insulation to prevent this can soon pay for itself in the savings that you make, estimated to be as much as £460 annually.

You can insulate your solid wall home either from the inside or the outside, but internal wall insulation is often seen as the most preferable option for homeowners as it is generally cheaper.

At British Gypsum we offer four internal wall insulation solutions, all of which are available under ECO schemes, so if you’d like to find out more about our products and how they could benefit you, please see our internal wall insulation page.  

What is internal wall insulation?

Internal wall insulation (IWI) is a type of solid wall insulation that is recognised as one of the most energy efficient home improvements that can be made. For this reason, internal wall insulation is often available to consumers under ECO or other government funding schemes.

One of the main benefits of IWI for the consumer is that it helps the inside of their home to heat up quickly and retain the heat for longer, but in addition to this there are many other benefits, including:

  • A reduction in heat loss through walls
  • A reduction in CO2 emissions from the property
  • A reduction in energy bills by as much as £460 per annum

Installing IWI requires no planning permission or scaffolding and preserves the external appearance and facade of the building. The installation of IWI can also take place when other interior work is happening or if the building has boundaries.

British Gypsum internal wall insulation

At British Gypsum we offer the following four internal wall insulation systems; all of which are BBA approved:

  • GypLyner UNIVERSAL
  • GypLyner IWL
  • DriLyner RF
  • DriLyner TL

Each of our internal wall insulation systems have been designed to reduce energy bills by offering an improved thermal performance and the best system for your home will be advised to you by your installer.

At British Gypsum we have a range of internal wall insulation systems suitable for your solid wall insulation needs; all of which are BBA approved.

Each of our internal wall insulation systems are supported by specialist installer training courses to ensure that our products are installed to meet PAS 2030 standards. PAS 2030 is the specification of requirements set out by the Department of Energy and Climate Change.

In addition to this, you can rest assured that your insulation system will provide great thermal performance for many years to come as each of our internal wall insulation systems comes with a 25 year guarantee. This guarantee is valid whenever one of our IWI systems is installed by a Solid Wall Insulation Guarantee Agency (SWIGA) registered installer.

Your installer will be able to advise you on the best internal wall insulation system for your home, but if you’d like further information about our range of British Gypsum IWI systems, please consult the table below.

Our Gyproc ThermaLine PIR and Gyproc ThermaLine SUPER plasterboard and wallboard products suit a variety of building surfaces and are suitable for use in any of our internal wall insulation systems.

Solid Wall Insulation Guarantee Agency

All of British Gypsum's IWI systems are endorsed

TIMSA logo

British Gypsum can support you with U-value calculations. These are provided by TIMSA certified staff.

Comparison of wall insulation types
  DriLyner RF              
DriLyner TL  GypLyner UNIVERSAL GypLyner IWL
Where can  it be used?


All home types including high-rise buildings


All building types, but predominantly commercial
Suitability Fixed directly to internally plastered brick/ block and smooth concrete walls

Bonded to bare masonry
Used on poor or uneven surfaces
Provides greater void to accommodate services
How is it installed?
Sealant to a  masonry lining system
Adhesive to a fixed masonry lining system
Metal framed wall lining system

A fully independent metal framed wall lining system
Installation complexity



Economical and quick to install


Channels located in tracks and supported by brackets fixed to the masonry walls

I-studs located in tracks independent of the masonry walls
Room for service void?
No, but accommodates electric cables and a microbore pipe if the walls have chases cut into them to allow services to be installed
No, but accommodates 
electric cables and microbore piping for heating systems against the wall before dry lining

Yes
Yes
Thermal (W/m2K)
Typical U value range of 0.35 – 0.25, based on a 215mm brick wall. Better values can be achieved
Typical U value range of 0.35 – 0.25, based on a 215mm brick wall. Better values can be achieved
Typical U value range of 0.35 – 0.25, based on a 215mm brick wall. Better values can be achieved

Typical U value range of 0.35 – 0.25, based on a 215mm brick wall. Better values can be achieved