TopBuild's (BLD) $1 billion acquisition of Specialty Products and Insulation will be "modestly accretive to earnings," Deutsche Bank said in a note emailed Thursday.

The investment firm said it is "supportive" of the deal, which brings together the number one and number two players in the $5.75 billion mechanical insulation market.

The deal boosts TopBuild's mechanical insulation presence from a low-double-digit share to about 20% market share, and will also add key geographies in the Northeast and Southeast, according to the note.

The transaction also means that TopBuild "continues to diversify its exposure toward the less cyclical commercial/industrial end markets and maintenance/remodeling demand drivers," Deutsche said.

Deutsche raised its price target on TopBuild to $508 from $466, while keeping the company's buy rating.

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