Gibraltar Industries Inc. ROCK stock has gained 22.6% in the past three months compared with the Zacks Building Products - Miscellaneous industry’s 8.8% growth and the Zacks Construction sector’s 6.5% rally. Hurdles to Cross Inflation & Supply Woes: There are three core materials that ROCK uses across the company, which include steel, aluminum and resin. Zacks Rank ROCK currently carries a Zacks Rank #3 (Hold).