Lowe's Cos said on Wednesday it has agreed to buy interior building products distributor Foundation Building Materials for nearly $8.8 billion, stepping up its expansion into the business that serves contractors and builders.

Lowe's ( LOW, Financials) said Wednesday it will acquire Foundation Building Materials for $8.8 billion, stepping deeper into the $250 billion professional builder market as do-it-yourself demand remains weak.

Lowe's is buying Foundation Building Materials, a distributor of drywall, insulation and other products, for approximately $8.8 billion as the home improvement retailer intensifies its focus on professional builders.