Internal Wall Insulation

Internal wall insulation is installed on the inner surface of uninsulated or solid exterior walls. This insulation is suitable for solid or uninsulated exterior walls and is typically available in boards, slabs, or rolls.

What is indoor wall insulation?

Indoor wall insulation refers to any insulation system installed on the interior side of exterior walls. This type of insulation is often useful for properties where the external wall cannot be insulated.

Installing insulation on the internal wall establishes a thermal barrier between the indoor space and the wall. This barrier reduces heat transmission through the wall and keeps the interior warmer.

What is internal wall insulation used for?

It is commonly used in terraced houses, listed buildings, and properties with decorative facades. External insulation is often unsuitable for these properties, making internal insulation the preferred option. It is also ideal for enhancing insulation in older properties.

Insulating interior walls helps to:

• Improve thermal efficiency.
• Reduce heating costs.
• Eliminate cold spots and draughts.
• Enhance indoor comfort during cold months.
• Reduce surface condensation on cold walls
• Meet Building Regulations for energy performance in renovations.

Types of internal insulation for walls

The best choice for insulation for interior walls depends on available space, budget, and wall type. Here’s a quick look at popular options and what makes each ideal for different needs:

PIR insulation

PIR boards are ideal for limited space, as they deliver remarkable thermal performance in a slim profile. They are easy to cut and install and can be used on both solid and stud walls. PIR boards with foil facings improve vapour control.

Insulated plasterboard

These are PIR boards faced with plasterboard. They offer a two-in-one solution that delivers efficient thermal protection and a smooth wall finish. A practical option for quick installation, they are ready for decoration immediately after fitting.

Ensure all board joints are sealed to prevent cold spots and air leakage.

Mineral wool insulation Rolls or Slabs

Flexible rolls and slabs can expand to seal spaces, making them excellent for uneven surfaces. However, they may require a vapour control layer to prevent internal condensation.

They are easy to cut and install, and are easily added to timber and metal stud walls. Rolls and slabs also offer good acoustic insulation and fire resistance.

Party wall insulation

Party wall insulation is used in walls that separate two properties – like semi-detached or terraced homes. While it is primarily installed for acoustic control, it also offers limited thermal advantages.

Sound-absorbing insulation, usually mineral wool, is used to fill the wall cavity or internal lining. The fibrous material traps sound vibrations and stops them from passing through the wall, while also minimising heat loss between homes.

Partition wall insulation 

Partition wall insulation is mainly used for sound control rather than heat retention. It is installed in internal partition walls, such as between bedrooms or offices, where it sits between the studs.

The insulation absorbs voices, television noise, and general airborne sounds. Breaking up sound waves in this manner makes rooms quieter and far more comfortable.

Benefits of internal wall insulation

Installing indoor insulation on walls comes with benefits such as:

• Enhanced comfort due to better heat retention
• Higher energy efficiency
• Lower heating bills
• Acoustic insulation, as it dampens sounds from outside and between rooms
• Flexible installation, as you can decide where to add the insulation without making exterior changes
• Improved property value because energy-efficient houses have higher EPC ratings and market appeal.

Why choose our wall insulation for indoor use?

Here is why Insulation Wholesale is the go-to store for indoor wall insulation:

• We offer a wide range of PIR insulation, EPS insulation, and mineral wool options.
• Our interior wall insulation delivers excellent U-value improvement with minimal thickness.
• It is simple to install, with lasting results.
• All our indoor insulation is compliant with UK Building Regulations.
• Get expert advice and support from our insulation specialists.
• We aim to deliver within 1–3 working days unless stated otherwise.

Save energy, cut heating costs, and insulate your property the smart way. Shop internal wall insulation today for fast delivery across the UK.