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External Wall Insulation
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Rockwool RWA45 Slab 40mm x 1200mm x 600mm (8.64m2 Pack)€83.95 €68.25/ ITEMDelivery Select delivery addressCollection Select a collection branch
Rockwool RWA45 Slab 75mm x 1200mm x 600mm (4.32m2 Pack)€78.95 €64.19/ ITEMDelivery Select delivery addressCollection Select a collection branch
External wall insulation is used to improve the thermal performance of existing buildings by adding a continuous insulation layer to the outside of the structure. At TJ O’Mahony, our external wall insulation range supports contractors and retrofit specialists working on energy-upgrade projects where reducing heat loss and improving building efficiency are key priorities. Unlike internal insulation systems, external wall insulation improves wall performance without reducing internal floor area. This makes it particularly effective for refurbishment and upgrade projects where maintaining internal room dimensions is important. By wrapping the building envelope externally, the system helps reduce thermal bridging and create a more continuous insulated shell.
External wall insulation is commonly specified for retrofit housing, older masonry buildings and projects targeting better energy ratings or improved BER performance. Once installed, the insulation layer is typically finished with render or another protective external finish, providing both thermal enhancement and improved weather protection to the building façade. These systems help reduce heating demand, improve indoor comfort and extend the service life of the building envelope when correctly specified and installed. They are increasingly used as part of modern retrofit strategies designed to bring older properties closer to current energy-efficiency expectations.
For contractors delivering upgrade and refurbishment works, external wall insulation offers a practical route to better thermal performance, lower energy use and improved building durability. It remains an important solution in Ireland’s growing focus on retrofit, energy performance and long-term building efficiency.