The back wall of a Mount Maunganui storage shed burst open sending some of the 10,000 tonnes of concrete rock inside spilling out and damaging a building next door.
The building, owned by Rorisons RMD and leased by HR Cement, backs onto an industrial area on Harvard Way.
The 11m high wall gave way about 6pm on Saturday night and fell partly onto a building owned by Tauranga developer Bob Clarkson. Most of the wall and metal spilled on to an empty lot behind.
HR Cement managing director Chris Hall said he received a panicked phone call from a staff member who was stacking a load of product when the wall fell down.
"I think it's just the weight of the metal's pushed it out basically," he said. "It was bloody lucky it was an empty section just here."