Thermalite Hi-Strength 7 is designed specifically for applications such as flats, offices, supermarkets and retail parks, where loading conditions require a 7.3N/mm² building block. Thermalite Hi-Strength 7 blocks are also suitable for external walls, foundations, partitions and separating walls. The blocks have the added benefit of being lightweight, easy to manage and easy to shape allowing for ease of use during your construction projects. Its high thermal insulation and great moisture resistance also make it an economically sound selection.