Machine-cut stone or blocks: which walling?
Machine-cut stone, hand-dressed stone and concrete blocks compared for strength, finish, speed and cost drivers when building in Kenya.
By Redbay Group ·
The walls set the budget
Walling is one of the biggest items in a house budget. The material you choose affects how fast the walls go up, how much mortar and plaster you need, and how the house looks if you leave the walls unplastered.
Machine-cut stone
Machine-cut stone comes from quarries in standard sizes with clean, square faces. Walls go up straight and fast, use less mortar, and can be left exposed for a natural stone look.
Quality varies between quarries. Check that the stones are hard, evenly sized and not crumbling at the edges. Transport is a big part of the cost, so the distance from the quarry matters.
Hand-dressed stone
Hand-dressed stone is shaped on site by masons. It suits foundations and rustic finishes, but sizes are less even, so walls take longer and use more mortar.
Concrete blocks
Concrete blocks are made from cement, sand and ballast. Well-made blocks are strong and uniform, and they are common on upper floors because they are consistent. Poorly made blocks with too little cement are weak, so buy from a reliable supplier or make them on site under supervision.
How to decide
- What is available near your site, and how far it must travel
- Whether the walls will be plastered or left exposed
- What the structural engineer specifies for load-bearing walls
- Speed: regular sizes build faster and need less plaster
- Mixing is fine: many homes use stone below and blocks above