Wall Insulation

Wall insulation is essential for creating an energy-efficient building envelope, reducing heat loss through external and internal walls while improving comfort and lowering heating costs. Whether you're upgrading an existing property or specifying for a new build, the right cavity or solid wall solution can significantly impact a building's thermal performance and BER rating.

Our Wall Insulation Solutions

We stock a comprehensive selection of products designed for different wall constructions and performance requirements:

• Cavity wall batts and slabs in mineral wool and glass fibre, offering excellent thermal and acoustic performance with non-combustible properties for fire safety compliance.
• Rigid PIR and phenolic boards delivering superior U-values in slim profiles, ideal where space is limited or high-performance specifications are required.
• Partial fill cavity boards maintaining a clear drainage cavity while meeting building regulation requirements for thermal efficiency.
• EPS and XPS boards providing moisture-resistant options suitable for below-grade applications and areas prone to damp.
• Internal wall insulation systems including insulated plasterboard for retrofitting solid wall properties without external disruption.

Browse our complete Insulation Materials range to find complementary products for your project, including Air Tightness Insulation solutions to maximise energy efficiency.

Selecting the appropriate product depends on your wall construction type, required U-value, available cavity width, and moisture exposure. For retrofit projects, consider whether internal or external application suits your building better, and always check compatibility with existing materials and ventilation requirements.

Why Choose McMahons for Your Insulation Needs?

With over 190 years serving the construction industry, McMahons combines product expertise with practical advice to help you specify correctly first time. Our knowledgeable staff understand Irish building regulations and can recommend solutions that balance performance, budget, and installation practicality. Ready to improve your building's thermal envelope? Check our delivery service to get your materials on site when you need them.