By November 2015 , CRH was getting about a fifth of its operating earnings from US infrastructure .
At the time , CRH already had a similar business in North America called BuildingEnvelope , with 4,500 employees , which it said it would integrate with CRH .
By November 2015 , CRH was getting about a fifth of CRH 's operating earnings from US infrastructure .
At the time , CRH already had a similar business in North America called BuildingEnvelope , with 4,500 employees , which it said it would integrate with CRH .