In 1984 UNITED LOCK-BLOCK LTD.™ (ULB) of Richmond, BC introduced a completely new way of building dry-stack retaining walls using massive precast interlocking concrete blocks.  LOCK-BLOCK® walls replaced conventional concrete and gabion retaining walls. This change happened because Engineers, Contactors, Developers, and Owners saved time, money and bother.

Practical ideas that save money succeed! Today millions of these cubic yard sized interlocking concrete blocks are in service in the seismically active, mountainous terrain along the West Coast of Canada and the USA.   LOCK-BLOCK® pads and weirs control scouring in fast moving mountain streams while LOCK-BLOCK® retaining walls control grade changes along highway and railroad right of ways.

LOCK-BLOCK® seawalls halt erosion. Dikes built with LOCK-BLOCK® units are used for spring flood control. Compatible LOCK-BLOCK® Beams and ARCH-LOCK® vaults bridge across sensitive spawning streams and drainage ditches.

Along the way to this success ULB became experts in concrete recycling.