The U.S. Bureau of Labor Statistics (BLS) released its latest Producer Price Index (PPI) for March, showing changes among prices for materials used in glazing and fenestration manufacturing as mixed.

The PPI for metal windows is up 0.3% from its February 2019 level and 10.8% year over year. Metal doors and frames showed an increase of 0.3% in March—up 5.4% for the year. Wood windows, overall, are up 3.2% from last month and 5.8% since last year. Millwork overall is up 3.1% since March 2018 and 0.6% since February.

The monthly PPI for flat glass in the commodity category fell by 0.7% from the previous month, but is up 0.4% from March 2018. According to 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 dropped 0.6% from February 2019 and is unchanged on a year-over-year basis. The industry classification measures “changes in prices received for the industry’s output sold outside the industry (that is, its net output).”

The cost of builders’ hardware, which includes hardware used in glass and glazing, dropped 0.2% in March. However, that price is 4.1% higher than in March 2018.

The price of thermoplastic resins and plastic materials dropped 0.5% from February 2019 and is down a full 4% since this time last year.

Prices for thermosetting resins and plastic materials also fell since February, down 3.2%, but remain at the same rates as they were in March 2018. Fiberglass plastic product prices are up 1.2% just since last month and a total of 2.8% for the year.