Yes, all Thermalite blocks are suitable for use below ground. The mirco-cellular structure of Thermalite, which incorporates millions of tiny pockets of trapped air, gives the material protection against the effects of frost. This means all the products in the range are suited for use below DPC level, for example, Forterra’s Turbo blocks can be used in up to Design Sulfate 3 (DS 3) level and all other Thermalite blocks can be used in up to DS 4 levels.
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