A Guide to Dividing Cinder Blocks Safely and Effectively
Cinder blocks are rectangular building components, commonly utilized in foundation work or temporary concrete structures. They are generally composed of concrete aggregates and cinder ash, appearing in a chalky gray color, and are known for being relatively lightweight. Despite their low weight, these blocks offer considerable structural strength when bound together with cement. They come in various lengths, yet certain projects may necessitate cutting a full-sized block down to size.
By Rowan Davis


Split a cinder block using basic workshop tools.
Cinder blocks are rectangular masonry components frequently employed in foundation building or temporary concrete setups. The majority are fabricated from concrete aggregates combined with cinder ash. These blocks typically have a chalky gray appearance and are fairly lightweight. Even though they are light, they provide significant structural integrity when joined with cement. Cinder blocks come in multiple lengths, but specific project needs might call for splitting a full-sized block.
Phase 1
Use chalk and a ruler to mark a guide line on the section of the cinder block you intend to split. If you want to divide the block equally, measure its length with a tape measure and then divide that number by two.
Phase 2
Flip the block to its other side and draw a matching guide line.
Phase 3
Place the chisel's edge along the guide line and strike the handle's end firmly with a hammer. Continue tapping at intervals of about one inch along the entire line.
Phase 4
Turn the block over again and carry out the same tapping process on the second guide line.
Phase 5
Pick up both halves of the cinder block and inspect the split edges to ensure they are clean. Remove any jagged pieces with the chisel and, if you prefer, use masonry sandpaper to smooth the edges.



