XR35
XR35 is our flagship high-performance ICF block. It combines a solid concrete core with thicker insulation on both sides, creating a wall that is warm, quiet and incredibly robust. Designed for projects where energy performance really matters, XR35 helps you achieve low U-values and excellent comfort without needing extra layers of external insulation.
Contact usWhere XR35 is used
XR35 is ideal for:
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Low-energy and near-Passivhaus homes
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Developments on exposed or noisy sites
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Projects where long-term running costs and comfort are key selling points
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Multi-residential schemes that need strong acoustic separation between units
Whether it’s a one-off self build or a larger housing development, XR35 provides a solid, high-performing shell that feels substantial to live in.
Key benefits
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Excellent thermal performance – increased insulation thickness around the concrete core helps to reduce heat loss and support strong EPC ratings.
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Comfort and acoustics – the combination of concrete and insulation delivers a very stable internal temperature and noticeable noise reduction.
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Simplicity – structure and insulation are built together in one system, reducing the need for additional external insulation and complicated detailing.
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Design flexibility – XR35 works with standard ICF detailing for corners, openings and junctions, so it can be integrated into a wide range of building types and elevations.