100mm Celcon H+H High Strength Grade Block is used where higher compressive strengths are required such as in the foundations and lower storeys of multi-storey buildings. **Blocks could be supplied in Thermalite depending on availability at point of order. Equivalent brands are of the same specification and price. **Blocks could be supplied in Thermalite depending on availability at point of order. Equivalent brand is of the same specification and price.