Prices of most materials used in the glass and glazing industry were either flat or slightly down in April, according to™ analysis of Producer Price Index (PPI) data released by the Bureau of Labor Statistics (BLS).

The monthly PPI for flat glass in the commodity category was unchanged in April at 132.9, following a slight 0.1 percent increase in March after staying flat in February. Those prices were up 1.3 percent from a year ago, signaling that prices have leveled out over the past 12 months.

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 103.8, indicating a 0.3-percent price decrease for the month and a 2.6-percent increase from April 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, decreased 0.4 percent over the month after a 0.7-percent increase from February to March. That index, in the commodity grouping, is 217.0, representing a 2.1-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 145.9.

Overall construction input prices rose for a fifth consecutive month in April, increasing by 0.7 percent on a monthly basis and 4.3 percent on a year-over-year basis, according to analysis from the Associated Builders and Contractors. Nonresidential construction input prices increased by 0.7 percent for the month and 4.2 percent for the year.