The housing rebound in the U.S. helped lift sales of a pair of building-related stocks. But Beacon Roofing Supply 's (BECN) and Louisiana-Pacific's (LPX) earnings fell short of analysts' expectations. Beacon reported adjusted first-quarter earnings of 37 cents per share, down from 39 cents a year ago, and 4 cents shy of analyst forecasts. Sales climbed almost 5% to $513.71 million, shy of analysts' views for $525.5 million. The company cited the