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

EMCOR Group, Inc.’s (EME) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. EMCOR Group is an electrical and mechanical construction and facilities services company that specializes in providing construction services relating to electrical and mechanical systems, engaging in the design, integration, installation, start-up, operation, and maintenance of various electrical and mechanical systems. EME also rates an F in Portfolio Grader’s specific subcategory of Earnings Surprise. For more information, get Portfolio Grader’s complete analysis of EME stock.

This week, Granite Construction Incorporated (GVA) drops from a C to a D rating. Granite Construction is a civil contractor in the United States. The stock gets F’s in Earnings Surprise and Margin Growth. The stock’s trailing PE Ratio is 38.40. To get an in-depth look at GVA, get Portfolio Grader’s complete analysis of GVA stock.

Quanta Services, Inc.’s (PWR) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Quanta Services provides specialized contracting services to electric utilities, telecommunication and cable television operators, and governmental entities. For more information, get Portfolio Grader’s complete analysis of PWR stock.

This week, Furmanite Corporation’s (FRM) rating worsens to an F from the company’s D rating a week ago. Furmanite provides worldwide technical services for a broad range of industries. The stock gets F’s in Earnings Growth, Earnings Surprise and Margin Growth. Shares of the stock are changing hands at twice the rate they were a week ago. The stock currently has a trailing PE Ratio of 30.50. To get an in-depth look at FRM, get Portfolio Grader’s complete analysis of FRM stock.

Comfort Systems USA, Inc. (FIX) earns a D this week, falling from last week’s grade of C. Comfort Systems provides heating, ventilation, and air conditioning installation, maintenance, repair, and replacement services within the mechanical services industry. The stock gets F’s in Earnings Momentum and Earnings Surprise. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. The stock has a trailing PE Ratio of 31.40. For more information, get Portfolio Grader’s complete analysis of FIX 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.