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Waterproofing Products

Waterproofing products are essential for protecting masonry, renders, and concrete from moisture penetration, damp ingress, and deterioration over time. From sealing exposed external walls to improving the water resistance of mortar mixes, these specialist admixtures and surface treatments help extend the life of your build and maintain its structural integrity in Ireland's wet climate.

Our Waterproofing Products Range

McMahons stocks a practical selection of masonry waterproofers and admixture products from trusted brands including Larsen, Thompsons, and Bostik.

  • Masonry waterproofers and sealers - surface-applied treatments such as Thompsons One Coat Water Seal that penetrate and seal external block, brick, and rendered walls against wind-driven rain without changing the appearance of the surface.
  • Integral waterproofing admixtures - liquid additives such as the Larsen Waterproofer that are added to mortar and render mixes to reduce porosity and improve resistance to moisture penetration throughout the material.
  • Combined waterproofer and plasticiser - dual-action products that both improve workability and provide waterproofing performance in a single admixture, simplifying the mixing process on site.
  • Water stop liquids - products such as Bostik Rito Water Stop for sealing active leaks and cracks in masonry, concrete, and rendered surfaces.
  • Driveway and surface sealers - treatments designed to protect paved and tarmac surfaces from water ingress, staining, and weather damage.

Browse our complete Adhesives & Sealants collection for complementary products, or explore our Cement & Lime range to source the base materials for your waterproofed mixes.

When selecting a waterproofing product, consider whether you need a surface treatment or an integral admixture. Surface sealers suit existing walls and completed structures, while admixtures are best incorporated at the mixing stage for new renders and mortars. Always check compatibility with your specific substrate and follow manufacturer dilution or dosage rates.

Why Choose McMahons for Waterproofing?

With over 190 years serving Ireland's building trade, our experienced staff can help you specify the right waterproofing solution for your project requirements. We stock trusted brands at competitive prices, ensuring you get reliable moisture protection. Find your nearest McMahons branch for expert advice and product recommendations.