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”).

This week, Lennox (NYSE:LII) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Lennox International designs, manufactures, and markets heating, ventilation, air conditioning, and refrigeration equipment. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Earnings Revisions, and Equity, LII also gets A’s. Shares of LII have increased 10.2% over the past month, better than the 3.5% decrease the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of LII stock.

Armstrong World Industries (NYSE:AWI) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Armstrong World Industries is a global producer of flooring products and ceiling systems for use mainly in the construction and renovation of residential, commercial and institutional buildings. Wall Street seems to agree with the upgrade and has propelled the stock up 7.4% over the past month. For more information, get Portfolio Grader’s complete analysis of AWI stock.

This week, Masco Corp.‘s (NYSE:MAS) ratings are up from a C last week to a B. Masco manufactures, distributes, and installs home improvement and building products such faucets, cabinets, and windows. For more information, get Portfolio Grader’s complete analysis of MAS 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.