Wall Insulation Boards & Sheets

Finding the right wall insulation for your property is essential for maintaining a warm, comfortable, and energy-efficient environment. At Insulation Warehouse Direct, we offer a versatile range of wall insulation boards and sheets, specifically designed to cater to your needs, whether you’re a homeowner, builder, or renovator. Wall insulation boards are an excellent solution for reducing heat loss, lowering energy bills, and enhancing thermal performance throughout your home or construction project.

With an array of options—including different thicknesses, materials, and specifications—our collection ensures there’s a perfect product for every project. Whether you’re working on cavity walls, solid walls, or external walls, wall insulation is a crucial investment for creating a sustainable and cost-effective home or building.

  • Energy Efficiency: Proper insulation ensures reduced heat loss and lower heating costs.
  • Versatility: Suitable for various wall types, including solid, cavity, external, and internal walls.
  • Sustainability: Supports energy-efficient designs and aligns with modern building regulations.
  • Space-Saving: Rigid insulation boards offer great thermal performance without taking up excessive space.

Whether it’s PIR insulation boards, phenolic insulation, or expanded polystyrene, there’s an effective solution for every property type and budget.

nsulation boards come in a variety of materials and designs, each suited to specific needs. Understanding the benefits and applications can help you choose the right product:

  1. Cavity Wall Insulation
    Designed for properties with cavity walls, these boards are inserted into the gap between two layers of brickwork. They prevent heat transfer through the cavity, making your property energy efficient.
  2. PIR Insulation Boards
    PIR (polyisocyanurate) boards are a popular choice for their high thermal efficiency and lightweight design. They are ideal for external walls, roofs, and floors, making them a versatile option for various insulation projects.
  3. Phenolic Insulation
    Known for its outstanding thermal performance, phenolic insulation boards are also fire-resistant and have low water absorption, making them suitable for damp areas.
  4. Insulated Plasterboard
    Combining insulation and a plasterboard layer saves time during installation. These boards are especially useful for internal wall insulation in both new constructions and retrofits.
  5. Expanded Polystyrene (EPS)
    EPS provides excellent insulation at a lower cost. Lightweight and easy to work with, EPS insulation sheets are an affordable option for both walls and floors.

Thickness plays a crucial role in determining the effectiveness of your wall insulation. For internal wall insulation, thickness usually ranges between 50mm and 100mm, depending on the U-value (a measure of thermal performance) you want to achieve. For external walls, slightly thicker boards may be required.

If you’re wondering whether 50mm insulation board is enough, it depends on your property’s heat-retention needs and compliance with building regulations. Thicker boards, like 75mm or 100mm, often deliver better thermal performance.

PIR insulation boards are widely considered one of the best options for their superior thermal efficiency, lightweight design, and compatibility with various applications.

Properly installed insulation boards can help prevent damp by minimising condensation and maintaining a consistent interior temperature. However, poorly installed or inappropriate insulation can lead to moisture issues, particularly in solid walls.

While they provide excellent thermal performance, insulation boards can sometimes be more expensive than alternatives like Rockwool or fibreglass rolls. Additionally, they may require professional installation for optimal results.

For many cases, 50mm boards provide adequate thermal insulation, but thicker boards may be needed for properties exposed to colder climates or strict energy regulations. Always consider building regulations and desired U-values.

Insulation boards can be attached to walls using adhesive, mechanical fixings, or a combination of both. Liquid adhesives ensure an even bond, while screws and washers provide secure fastening, particularly for insulated plasterboard.

The most cost-effective option is installing insulated plasterboard. This method reduces labour and material costs while improving insulation.

If properly installed with breathable materials and an air gap, internal wall insulation should not cause damp. However, retrofitting solid walls requires careful assessment to avoid trapping moisture.

Both brands offer high-quality PIR insulation boards with excellent thermal conductivity. Whether you choose Celotex or Kingspan depends on your specific requirements and budget.

For internal wall insulation in existing properties, options include installing insulated plasterboard, applying PIR boards, or using phenolic insulation sheets. Ensure adequate preparation by sealing gaps and ensuring walls are dry before installation.

Yes, insulation boards can be installed as a DIY project if you have the right tools and guidance. However, for complex applications like external cladding or solid wall retrofitting, professional expertise is recommended.

  • Can you plaster directly onto insulation boards?
    Yes, many insulation boards, including insulated plasterboards, are designed for direct plaster application after proper installation.
  • Does Kingspan need an air gap?
    Kingspan boards are manufactured with built-in vapour resistance, so an additional air gap isn’t always necessary. It depends on the wall type and project requirements.
  • How do you attach insulation boards to a brick wall?
    Adhesives or mechanical fixings work well for attaching insulation boards to indoor or external brick walls. Products like Celotex can often be stuck directly to brick walls with strong adhesive.
  • Is internal wall insulation worth it?
    Absolutely. Internal wall insulation is an excellent way to reduce energy bills and heat loss while improving interior comfort.

Installing wall insulation is a key step towards improving your property’s energy efficiency. Insulation boards significantly reduce heat transfer through walls, contributing to a more sustainable and budget-friendly home. This is particularly important for properties with older, solid walls that typically lose more heat.

By choosing the right insulation material, thickness, and installation method, you can meet energy-efficiency goals, comply with building regulations, and enjoy a more comfortable home.