International Aluminum Corp. reported first quarter net income of $6.5 million ($1.51 per share), an 80 percent increase from $3.6 million (84 cents) for the same period a year earlier.

Sales for the Monterey Park-based aluminum and vinyl maker were up 16 percent to $80.6 million mainly due to strong demand for aluminum products used in commercial construction.

Shares in International Aluminum closed up 81 cents to $40.62 Monday.