Mock up Part Rendered walls: sawdust, cement, power paint, sand and water

Using a rough course sand in the render to patch holes and gaps in brickwork to make a flat surface for render, and reducing any potential holes for insects and vermin to live in or move through

ditto: patching holes and small gaps to make a flatter surface for applying render

Render mixture: sawdust and cement  acting as binders. Then power paint which is cheap to make a deep rich colour to render, so colour last longer. Then using sand as aggregate and water agent for mixing and drying
Ratio by dry volume: 10 part sand : 1 part cement : 1 part sawdust
water added to make desired render consistencey (approximately 2 litre per wheelbarrow)
paint powder was 0.25 kgs per wheel barrow. 

we made half wheelbarrow mixture and applied a generous 1cm thick layer to the blockwork

taking care not to cover one's self in render as you flick the render at the wall, in Rwanda these like to use this machine to through render at the wall with and hand winding handle.

We agreed with the owner that the masonry columns should be a different colour to the walls, given that it is a distinguishing feature of his house from the context, the exterior walls yellow, the masonry columns red and inside walls white.

we plan is to render upto the window edge, therefore protecting the lower walls from erosion form heavy rains 

final touches we made to render with just water on the palette knife to give the render a smooth finish