Soil

Just as with Road Rapid, although the ingredients are very different, the soil needs to fulfil certain specifics, in order to use Block Rapid successfully.  The two major requirements are that there is at least 15% of clay, loam or clayey silts in the soil. And the soil must have an pH which does not exceed the 8.

Read more:
Introduction
How to use it
Shape of the blocks
Inexpensive house constructions
Span of Rapid Co machinery