Amarr Garage Doors on Thursday laid off another 18 employees in Lawrence, less than three months after the manufacturer cut 100 jobs amid a weak national housing market.

Amarr now has about 460 employees at its 420,000-square-foot plant in the East Hills Business Park, where it continues to make, distribute and market garage doors for residential and commercial uses.

“Similar to other manufacturing companies in the building products sector, Amarr continues to be affected by the downturn in the economy,” said Kirsten Krug, Amarr’s director of people in Lawrence. “Today, we implemented another round of layoffs/job cuts at our Lawrence manufacturing plant.

“We deeply regret having to take this action. In light of the current economic environment, however, we must align Amarr’s manufacturing capacity with the reduced demands that we are experiencing.”

The plant is the largest for North Carolina-based Amarr, accounting for about 90 percent of the company’s production.

Krug described Thursday’s layoffs in Lawrence as being across the organization.

In December, the company said that it was laying off about 100 workers in Lawrence, of which 80 came from management, manufacturing and administration divisions. The remaining 20 were seasonal positions that typically are eliminated during winter months.