Cutting and Modifying Concrete Blocks 
Video: Build a Retaining Wall
with Outside Curves
Video: Build a Retaining Wall
with Inside Curves
Video: Build a Retaining Wall
Outside Corner
Video: Build a Retaining Wall
Inside Corner
SAFETY FIRST: Always wear safety glasses when splitting or cutting concrete retaining wall blocks. A dust mask is recommended when cutting blocks.
- Use a masonry saw with a diamond cutting blad or a metal chop saw with a dry cutting diamond blade.
- NOTE: Masonry saws and metal chop saws are available for rental at most retail centers.
Capping Curves
Capping a curved retaining wall takes a bit of cutting and fitting, but produces a beautiful finish. Be sure to wear appropriate safety gear, including protective eye wear, dust mask, and hearing protection when cutting, and operate power saws carefully.
Modifying capstone for curved walls
- Place two caps on top of the retaining wall, spaced so a third cap will fit tightly between their widest point.
- Set another cap on top of the first two caps in the center and mark where they overlap on the bottom of the center cap.
- Remove the center cap and cut along the marks. Then set in place so the three fit tightly together.
- For complete details see instructions on building curved retaining walls.
Capping Corners
Cut caps at 45 degree angles