Prices of materials used in the glass and glazing industry went in several directions in May, according to Producer Price Index (PPI) data released by the Bureau of Labor Statistics (BLS).

The monthly PPI for flat glass in the commodity category edged down 0.2 percent to 132.9 in May after going unchanged in April. Those prices were up 0.6 percent from a year ago, signaling that prices continue to level out over the 12-month span.

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 stands at 103.9, indicating a 0.1-percent price increase for the month and a 1.4-percent increase from May 2016. This also shows a flattening of prices compared to previous year-over-year changes earlier in 2017 and in 2016.

The BLS notes that 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, which include glazing systems, increased 0.6 percent over the month after a 0.4-percent increase from March to April. That index, in the commodity grouping, is 218.5, representing a 2.4-percent price increase year-over-year.

Ornamental and architectural metal product manufacturing, in the industry category, was up 0.1 percent for the month and 2.2 percent for the year with an index of 146.0.

Construction input prices remained unchanged in May, ending five straight months of price expansion, according to the Associated Builders and Contractors’ analysis. Construction input prices expanded 3.4 percent on a year-over-year basis. Nonresidential construction input prices also were unchanged on a monthly basis but increased by 3.1 percent over the year.