Aaron Sheely from Trendz Homes had put concrete bags up against the wall in a panic.
Sheely said it took about 10 minutes before his business was flooded right through, and pink batts and product had been damaged by the water.
"We are just hopeful everything important is off the ground," he said.
Janine Cooney from Trench It in Oak Lane said the water was knee deep in their workshop.
"Our office was completely flooded," she said. "We export machinery overseas and we had stock out on the floor. Until all the water subsides we can't see how damaged everything is. We have parts under water."
Cooney was not looking forward to the big clean-up but was thankful there was "no lives lost".