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.

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 cost of thermoplastic resins and plastic materials rose 3.1 percent since April, and are up 11.3 percent from last year. Prices for thermosetting resins and plastic materials fell 0.4 percent since April, but are up 4.1 percent since 2016. Fiberglass plastic product prices fell 0.5 percent since last month.

Prices for wood window units were unchanged from April and are up 2 percent since May 2016. Prices for wood doors for interior and exterior applications rose 0.3 percent during the past month. They’re up 4.5 percent since last years. Metal windows rose 0.1 percent from April’s reading, and metal doors and frames climbed 0.2 percent.

The cost of builders’ hardware, which includes hardware used in doors and windows, increased 1.4 percent  from April. It’s up 2.7 percent for the year.

The prices of softwood lumber and OSB increased by 2.2 percent and 3.3 percent, respectively, in May


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