Thermal Insulation

At Avonside, we supply complete thermal insulation solutions designed to improve energy efficiency, fire performance, and building comfort across commercial and residential projects.

As a trusted independent distributor to the UK construction industry, we provide a comprehensive range of insulation products, including PIR insulation boards, mineral wool insulation, cavity wall insulation, and external wall insulation systems (EWI), all supported by expert technical guidance and reliable nationwide delivery.

Our thermal insulation systems integrate seamlessly with our Drylining, Ceiling Systems, and Render Systems, allowing Avonside to deliver fully coordinated building envelope and interior solutions from a single trusted supplier.

Our range is fully compliant with UK building regulations and is suitable for new build, refurbishment, and retrofit projects. Whether insulating walls, floors, roofs, or façades, Avonside delivers high-performance insulation systems that reduce heat loss, lower energy costs, and support sustainable construction.

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What Is Thermal Insulation?

Thermal insulation reduces heat transfer through a building’s structure, improving energy efficiency and internal comfort. A complete insulation solution typically includes:

Insulation boards, slabs, or rolls
Fixings, adhesives, and mechanical anchors
Vapour control layers (VCL) and membranes
Fire protection and acoustic layers where required

Together, these form a system that enhances thermal performance, fire safety, moisture control, and regulatory compliance.

Our Thermal Insulation Range

We supply the UK’s most widely specified and searched insulation products, including:

PIR insulation boards (Kingspan, Celotex, Recticel, EcoTherm)
- High-performance rigid boards for walls, floors, and roofs
- Excellent thermal conductivity (low lambda values)
- One of the most commonly specified insulation products in UK construction

Phenolic insulation boards
- Ultra-low lambda values for projects requiring maximum thermal performance

Mineral wool insulation (Rockwool, Knauf, Isover)
- Stone wool and glass wool slabs and rolls
- Non-combustible insulation (A1 rated)
- Excellent fire resistance and acoustic performance
- Widely used in partitions, façades, and fire-rated constructions

Cavity wall insulation boards and batts
- Full-fill and partial-fill cavity insulation
- Improves U-values and reduces thermal bridging

Floor insulation boards
- Rigid insulation for solid and suspended floors
- High compressive strength for load-bearing applications

Roof and loft insulation
- Rolls, slabs, and rigid boards for pitched and flat roofs
- One of the highest searched insulation categories in the UK market

External Wall Insulation (EWI) boards
- EPS, mineral wool, and phenolic insulation for rendered façades
- Used with silicone, acrylic, mineral, and monocouche render systems

Fire-rated insulation solutions
- Non-combustible insulation for higher-risk buildings
- Systems tested to meet Approved Document B

These products represent the most commonly purchased and specified insulation materials across UK commercial and residential construction.

High-Performance Insulation Systems

Our insulation systems are engineered to deliver:

Improved U-values and reduced heat loss
Low thermal conductivity (lambda performance)
Enhanced fire safety and compliance
Acoustic insulation alongside thermal performance
Moisture resistance and vapour control

Ideal for:

Residential developments
Commercial buildings
Education and healthcare projects
Industrial and mixed-use schemes

Fire Safety & Compliance

Fire safety is critical when specifying insulation systems. We supply:

Non-combustible insulation (A1 mineral wool systems)
Fire-tested façade insulation solutions
Products compliant with Approved Document B
Insulation suitable for high-rise and higher-risk buildings

Our technical team supports full system specification to ensure compliance, safety, and long-term performance.

Leading Insulation Manufacturers

We work with the most searched and trusted insulation brands in the UK, including:

Kingspan
Celotex
Rockwool
Knauf Insulation
Isover
Recticel
EcoTherm

This ensures product availability, technical certification, and competitive pricing across all insulation categories.

Sustainability & Energy Efficiency

Thermal insulation is central to reducing carbon emissions and improving building performance. Our products support:

Part L compliance
Improved EPC ratings
Reduced operational energy use
Long-life performance and durability
Use of recycled and low-impact materials

Insulation remains the most cost-effective method of improving a building’s energy efficiency.

Why Choose Avonside for Thermal Insulation?

By combining Thermal Insulation with our Drylining, Ceiling Systems, and Render Systems, we provide a complete, technically aligned solution that simplifies procurement, improves compliance, and strengthens project delivery.

Specialists in thermal insulation, drylining, ceilings, and façade systems
One of the UK’s most comprehensive insulation product ranges
Nationwide delivery network
Strong supply chain relationships with key manufacturers
Technical expertise in specification and compliance
Reliable service built on accuracy and responsiveness

We simplify procurement by supplying insulation alongside drylining, ceiling systems, render systems, and fire protection products – creating a fully integrated building envelope solution.

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