Roof Ventilation

Effective ventilation is essential for maintaining a healthy, moisture-free building envelope. Proper airflow through roof spaces, lofts, and wall cavities prevents condensation buildup, reduces the risk of timber rot, and helps regulate temperature extremes throughout the year. Whether you're working on a new build or upgrading an existing property, the right airflow solutions protect your structure and improve indoor air quality for years to come.

Our Roof and Building Airflow Solutions

McMahons stocks a comprehensive selection of products designed to meet Irish building regulations and climate demands.

• Glidevale G5 universal tile vent - a universal tile ventilator with 20,000mm² airflow, compatible with all standard tile profiles without the need for profile-specific matching. Can also be adapted for SVP and mechanical extraction terminal use with a pipe adaptor and flexible pipe.
• Glidevale G5 tile vent (Morrissey tile) - a tile-specific version of the G5 ventilator designed to integrate neatly with Morrissey concrete tiles, commonly used on Irish roof installations.
• Klober slate vent with cowl 600x300mm - a purpose-made ventilator designed to integrate into natural slate roofs at standard slate sizes, with an integral cowl and downpipe connection for roof space ventilation, SVP termination, or mechanical extraction.
• Soffit vents - circular round soffit vents (twist-and-lock, 70mm) in black and white, and continuous soffit vent strips (5m lengths) in black and white, allowing controlled airflow into the roof space through the soffit to prevent condensation, wood rot, and mould growth.
• Eaves protector trays - 225mm x 1.5m plastic eaves trays fitted between the felt/membrane and the soffit at the eaves to maintain the correct airflow gap and direct any water ingress down into the gutter rather than into the wall.
• Flexible ducting and vent hoses - aluminium and PVC flexi vent hoses in 100mm, 125mm, and 152mm diameters, and rigid PVC flexible ducting in 127mm x 6m, for connecting tile and soffit vents to roof space ventilation pathways and extraction systems.
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Browse our full Roofing & Ventilation Products range to find complementary materials for your project, including Fascia & Soffit boards that work alongside your chosen vent systems.

When selecting airflow components, consider the roof pitch, covering material, and required free air area for your loft space. Building regulations specify minimum airflow rates: our team can help you calculate the correct number and positioning of vents to achieve compliance and optimal performance.

Why Choose McMahons for Your Airflow Requirements?

With nearly two centuries of building expertise, McMahons understands Ireland's unique construction challenges. Our branches stock products suited to local weather conditions, and our knowledgeable staff can advise on specification and installation best practice. Ready to complete your roofing project? Check our delivery options to get materials on site when you need them.