Prices for many materials used in glass and glazing manufacturing grew in August after slight dips in July, according to the latest Producer Price Index (PPI) from the U.S. Bureau of Labor Statistics (BLS).

The monthly PPI for flat glass in the commodity category dropped 0.1 percent from the previous month, but is up 2.7 percent from August 2017. According to the BLS, the commodity classification “organizes products and services by similarity or material composition, regardless of the industry classification of the producing establishment.”

The index for flat glass manufacturing in the industry classification increased 0.4 percent from July 2018 after a 0.9-percent drop last month. It’s up 7.1 percent from August 2017. The industry classification measures “changes in prices received for the industry’s output sold outside the industry (that is, its net output).”

Prices for fabricated structural metal products grew 0.2 percent from the previous month. That index, in the commodity grouping, is up 8.2 percent for the year. Ornamental and architectural metal product manufacturing, in the industry category, saw a price increase of 0.3 percent for the month, and has experienced a 6.9-percent increase since August 2017.

The PPI for metal windows rose 3.5 percent from its July level, and is up 11.3 percent from August 2017’s report. Metal doors and frames rose 0.9 percent from July and the category is up 5.8 percent for the year.

The cost of builders’ hardware, which includes hardware used in glass and glazing, dropped 0.2 percent in August from the previous month. That price is 2.8 percent higher than in August 2017.