What is internal wall insulation?

Internal wall insulation is the process of adding insulation to your internal walls to stop heat loss through the wall fabric. This can be achieved using foam boards like PIR, or insulation slabs like RWA45, RS60 and others.

is internal wall insulation worth it

Yes. Internal wall insulation can save nearly 45% of the heat loss every year.

How thick is internal wall insulation?

PIR insulation that is generally used to insulate internal walls can be anything between 60mm to 110mm thick. If you plan to insulate internal walls by the method of stud wall insulation, then the thickness of insulation batts you need will depend on the timber frames of the stud walls

What insulation should I use for interior walls?

You can insulate internal walls using rigid foam boards like PIR insulation or build a stud wall and insulate the stud wall using insulation slabs and plasterboards

Do internal walls need insulation

Yes. Insulating internal walls can help make your home more energy-efficient. Internal wall insulation saves up to 45% of the heat that is otherwise lost through walls.

How to insulate interior walls?

Internal walls can be insulated using rigid foam boards that are fixed directly fixed to the wall surface using adhesives or by building stud walls and by insulating them using insulation slabs like Rockwool RWA45, Knauf Rocksilk RS45 and others.

Does insulating interior walls help with sound?

Yes, internal wall insulation can help soundproof a room. You can insulate stud walls using acoustic insulation slabs like RWA45, Rocksilk RS45 and others.

What are the different types of internal wall insulation?

There are many different products available in the market today to insulate internal walls. Here at Buy Insulation Online, we store PIR boards that can be fixed to any existing internal walls. We also stock Insulation slabs that friction-fit between the stud walls and plasterboards - both insulated plasterboards and standard ones.

How to insulate interior walls in an existing house?

Existing internal walls can be insulated by adding a stud wall that must be insulated with insulation slabs. Please refer to our blog, for more information

How to insulate internal garage wall?

Internal garage walls can be insulated using insulated plasterboards like Knauf XPS laminate, Xthratherm Thermal Laminate, or Celotex boards etc. garage wall insulation can also be achieved by creating stud walls and insulating them with insulation slabs like RWA45, RS45, Rockwool Flexi and others.

Who are eligible for internal wall insulation grants?

Please refer to the complete list of people eligible for internal wall insulation grants here

Internal Wall Insulation

Internal wall insulation is an effective solution for reducing heat loss and enhancing the energy efficiency of solid walls and internal walls in UK properties. By choosing to insulate your home’s interior, you can create a warmer environment, lower energy bills, and prevent condensation. Internal insulation is ideal for homes without cavity walls or when external wall insulation isn’t a viable option.

Our range includes insulation boards, mineral wool, insulated plasterboard, and fibre batts designed to fit stud walls and solid wall applications. Products like Kingspan boards are available in various thicknesses to suit different project requirements, providing superior thermal conductivity and vapour control. Vapour barriers, adhesive, fixings, and batten systems ensure easy installation and long-lasting performance.

Whether you're upgrading a cavity wall or reinforcing internal walls, our internal wall insulation solutions help prevent heat loss, minimise penetration, and improve overall comfort. Browse our selection today for insulated plasterboard, plaster, and everything needed to achieve high-performance internal insulation.

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A Complete Guide to Internal Wall Insulation for UK Homes

Internal wall insulation is an effective way to improve energy efficiency, reduce heat loss, and lower heating bills for UK homeowners. For properties with solid brick or stone walls that lack cavity insulation, installing internal wall insulation can significantly enhance thermal performance without impacting the external appearance of the building.

Why Choose Internal Wall Insulation?

Solid walls can be insulated from the inside, providing an effective insulation solution for homes where external insulation is not feasible. By adding insulation to the interior wall, you can reduce heat loss, improve the comfort of your home, and cut down on energy bills. According to the Energy Saving Trust, internal wall insulation can reduce heating bills by up to 40%.

Types of Internal Wall Insulation

There are several insulation materials available for insulating internal walls, each offering different properties and benefits. The best internal wall insulation for your home will depend on your specific requirements and budget.

Rigid Insulation Boards
Rigid insulation boards, such as PIR insulation and Knauf products, are fixed directly to the wall using mechanical fixings or adhesive. This type of insulation provides excellent thermal performance and reduces cold bridging.
Wool Insulation
Wool insulation, including materials like wood fibre and breathable insulation, is often used within stud walls. This type of insulation offers excellent sound insulation properties and can help prevent condensation on internal walls.
Stud Wall Filled Insulation
Constructing a new stud wall and filling it with wool or rigid insulation materials is another common approach. This method allows for a higher level of insulation and can also improve soundproofing within the home.

Benefits of Internal Wall Insulation

Improve Energy Efficiency: Internal wall insulation helps retain heat, improving the overall energy efficiency of your home.
Reduce Heat Loss: By installing internal wall insulation, heat loss through solid brick or solid stone walls is minimized.
Lower Energy Bills: Proper insulation can lead to substantial savings on heating bills.
Comfort: Insulating interior walls creates a warmer, more comfortable living space.
Minimal External Impact: Unlike external insulation, internal wall insulation does not alter the appearance of the building's facade.

How to Install Internal Wall Insulation

Installing internal wall insulation involves applying a layer of insulation material to the inside of external walls. This can be achieved in several ways:

Fixing Rigid Insulation Boards
Rigid insulation boards are applied to the wall using adhesive or mechanical fixings. They are often finished with plasterboard for a smooth interior surface.
Building a New Stud Wall
A wooden or metal stud wall is constructed inside the existing wall, and insulation materials like wood fibre or wool insulation are placed within the stud cavities. This method improves both thermal and sound insulation.
Breathable Insulation
For older properties or solid stone walls, breathable insulation materials can be used to prevent moisture buildup and condensation on internal walls.

Key Considerations

Building Regulations: Ensure that your insulation project complies with UK building regulations regarding U-values and energy efficiency.
Condensation Control: Proper installation helps reduce condensation on internal walls, preventing mold and damp issues.
Space Reduction: Adding insulation to the interior of a home may slightly reduce the floor area.
Grants Available for Internal Wall Insulation: Homeowners may be eligible for grants or financial assistance to offset the cost of internal wall insulation.

Cost of Internal Wall Insulation

The cost of internal wall insulation varies depending on the type of insulation used, the size of the property, and the installation method. While initial costs may be significant, the long-term savings on energy bills make it a worthwhile investment.

Choosing the Right Insulation Material

The right insulation material will depend on factors such as the wall type, level of insulation required, and desired insulation properties. Materials like PIR insulation, wood fibre, and rigid insulation boards are popular choices.

Final Thoughts

Internal wall insulation is an excellent way to enhance the thermal performance of your home, reduce your heating bills, and improve overall comfort. By selecting the best internal wall insulation and ensuring correct installation, UK homeowners can enjoy a more energy-efficient and cost-effective living environment. For further advice or to explore insulation products, contact a professional installer today.