This week, three Building Products stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

AAON, Inc. (NASDAQ:AAON) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. AAON manufactures and sells air-conditioning and heating equipment. In Portfolio Grader’s specific subcategory of Earnings Momentum, AAON also gets an A. The stock price has pushed upwards for the past two days, reaching $23.32. For more information, get Portfolio Grader’s complete analysis of AAON stock.

NCI Building Systems, Inc. (NYSE:NCS) earns a B this week, jumping up from last week’s grade of C. NCI Building Systems designs, manufactures, and markets metal engineered building systems and products for the building industry. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of NCS stock.

PGT, Inc. (NASDAQ:PGTI) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. PGT manufactures and supplies residential impact-resistant windows and doors. For more information, get Portfolio Grader’s complete analysis of PGTI stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.