The Thermo-loc Platinum Multi Cavity Closer provides a practical and reliable solution for preventing cold bridging and damp penetration around external doors, window jambs, and sills. Designed to deliver excellent thermal insulation, it helps ensure your project meets the latest building standards with ease.

This version is ideal for cavities ranging from 50mm to 100mm, making it a perfect fit for walls that require as small as a 50mm cavity closer. With pre-cut grooves, the closer can be easily trimmed on-site to suit your exact requirements, offering flexibility, precision, and efficiency. Whether you're sealing around a front door or finishing off window frames, this cavity closer ensures a clean, insulated seal every time.

Measuring 2.4m in length, the Thermo-loc Platinum Multi Cavity Closer is lightweight, simple to install, and suitable for use across a wide range of build types. From new builds to refurbishments, this product is a smart choice for professional contractors and self-builders alike. Need something for larger cavities? We also stock a bigger option suitable for 100mm to 150mm cavities.

At Mitcham Builders Merchants, we stock 50mm to 100mm cavity closers alongside everything else you need for your build, all under one roof. As South London's largest independent builders merchant, we offer fast and convenient service online and in-store. Browse our full range in branch or place your order online with same and next-day delivery available in selected areas.

Not sure which size you need? Our friendly and knowledgeable team is always ready to help you find the right fit for your project.