Oct 8 (Reuters) - TopBuild Corp ( BLD ) said on

Wednesday it has acquired Specialty Products and Insulation

(SPI) for $1 billion in cash, about a year after the two

building material makers had terminated their initial agreement

over anti-trust concerns.

The deal, which closed on October 7, excludes SPI's metal

building insulation (MBI) business, TopBuild ( BLD ) said.

The Department of Justice had raised concerns over the

deal harming competition

, following which the companies had terminated their

agreement last year.

TopBuild ( BLD ) expects $35 million to $40 million in annual

cost synergies within two years, the company said.