The grades of three Building Products stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

AAON, Inc. (NASDAQ:AAON) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating 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 risen 14.7% over the past month, better than the 1.3% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of AAON stock.

NCI Building Systems, Inc. (NYSE:NCS) gets a higher grade this week, advancing from a C last week to a B. NCI Building Systems designs, manufactures, and markets metal engineered building systems and products for the building industry. For more information, get Portfolio Grader’s complete analysis of NCS stock.

PGT, Inc. (NASDAQ:PGTI) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this 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.