Insulation Materials

Insulation materials play a critical role in controlling heat loss, improving energy efficiency, and ensuring compliance with Irish building regulations. Whether you're upgrading an existing property or working on a new build, the right thermal and acoustic solutions help reduce heating costs, prevent condensation, and create more comfortable living spaces year-round.

Our Insulation Range

We stock a comprehensive selection of products to suit walls, floors, roofs, and specialist applications:

• Rigid foam boards – PIR and phenolic panels delivering high thermal performance with minimal thickness, ideal for space-constrained retrofits and flat roof applications.
• Mineral wool rolls and batts – glass and stone wool options offering excellent fire resistance and acoustic dampening for partition walls, lofts, and timber frame construction.
• Cavity wall solutions – full-fill and partial-fill boards designed for masonry cavity walls, meeting Part L compliance requirements.
• Floor insulation – high-compressive-strength boards suitable for underfloor heating systems and floating floor constructions.
• Pipe and tank lagging – frost protection and heat retention for plumbing runs in unheated spaces.

Browse our full Building Materials section to find complementary products including Adhesives & Sealants for airtight installations.

Selecting the correct product depends on the application, required U-values, and available installation depth. Consider factors like moisture resistance for below-grade work, fire ratings for party walls, and whether mechanical fixing or friction-fit installation suits your project best.

Why Choose McMahons for Your Thermal Solutions?

With nearly two centuries serving Irish builders, our teams understand local building regulation requirements and can advise on achieving optimal energy ratings for your specific project. We carry trusted brands at competitive prices, with delivery available across our branch network for both small and large orders. Ready to discuss your requirements? Find your nearest McMahons branch and speak with our knowledgeable staff today.

Frequently Asked Questions

1. What type of insulation is best for lofts?

Mineral wool rolls and PIR boards are commonly used for loft insulation thanks to their excellent thermal efficiency and easy installation.

2. Do I need acoustic insulation for internal walls?

If you want to reduce noise between rooms, acoustic insulation is highly recommended. It helps improve sound control in bedrooms, studies, and media rooms.

3. What thickness of insulation do I need?

Thickness requirements vary by application and building regulations. Many lofts require 270mm or more to meet recommended standards.

4. Is PIR insulation better than mineral wool?

PIR boards offer higher thermal performance per mm of thickness, while mineral wool is more flexible, cost-effective, and ideal for irregular spaces.

5. Can I install insulation myself?

Yes. Many insulation products are DIY-friendly, though some applications, such as cavity wall insulation or large commercial installs require professional installation.

6. Are your insulation materials environmentally friendly?

We stock eco-conscious options including recyclable mineral wool and energy-saving thermal boards that help reduce long-term carbon footprint.