This week, the overall grades of four building products stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Quanex Building Products Corporation (NX) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Quanex Building Products manufactures engineered materials and components for the building markets. In Portfolio Grader’s specific subcategories of Earnings Revisions and Earnings Surprise, NX also gets F’s. To get an in-depth look at NX, get Portfolio Grader’s complete analysis of NX stock.

Universal Forest Products, Inc. (UFPI) experiences a ratings drop this week, going from last week’s C to a D. Universal Forest Products manufactures and installs lumber, composite wood, plastic and other building products for construction, manufactured housing and industrial markets. For more information, get Portfolio Grader’s complete analysis of UFPI stock.

Simpson Manufacturing Co., Inc. (SSD) gets weaker ratings this week as last week’s C drops to a D. Simpson Manufacturing engages in the design, engineering, manufacture, and sale of building construction products. The stock currently has a trailing PE Ratio of 26.40. To get an in-depth look at SSD, get Portfolio Grader’s complete analysis of SSD stock.

Owens Corning (OC) earns a D this week, falling from last week’s grade of C. Owens Corning produces residential and commercial building materials, glass-fiber reinforcements and engineered materials for composite systems. The stock gets F’s in Earnings Momentum and Earnings Revisions. For more information, get Portfolio Grader’s complete analysis of OC 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.