The upgradeable Blair VIP (uBVIP) - SuSanA

The construction of this “start off
unit” uses a single bag of
Portland cement, about 500 farm
bricks, sand and some 3mm
wire.
This economical use of cement is
possible because:
1. A well tested mortar mix of
20:1 pit sand and cement works
well as a brick mortar.
2. . The corbelling technique
makes possible the use of a
smaller, lighter and more
economic slab.
3. The pit is shallower but wider
making it easier to build and
further away from ground water.