South Florida companies Imperial Industries and Decorator Industries continue to see their bottom lines suffer in the collapse of the region’s housing market. Second-quarter losses at Pompano Beach-based Imperial, which makes building products such as stucco and plaster, widened to $833,000, or 33 cent per share, from $152,000 — 6 cents a share — in the same quarter last year. Sales slid from $13.6 million to $11.6 million. Imperial said it continues to improve its infrastructure and facilities. Pembroke Pines-based Decorator Industries, which makes interior furnishings for manufactured homes and recreational vehicles, lost $1.06 million, or 36 cents per share, compared with profits of $64,000, or 2 cents a share a year ago. The company’s sales slipped 1 percent to $12.6 million.