Insulation Price Index
What batt and blown insulation are doing at the factory gate, from the federal index. One of the few building materials currently getting cheaper. Free to cite.
Year over year
-1.8%
Building insulation, July 2026 against the same month a year earlier
Since the 2024 average
-1.1%
Index at 269.549, against 272.5412 for 2024
BLS series WPU139201, data through July 2026. Page last updated September 4, 2026.
Building insulation, 2019 to 2026
Insulation followed the same 2021 and 2022 run-up as everything else, then did something most materials have not: it started coming back down.
Why there is no dollar figure here
A dollar price per unit would mean very little here. Insulation is sold by the package, and what one package covers changes with R-value and stud spacing, so the same money buys wildly different amounts of wall depending on what you are buying. Our Insulation Calculator asks for coverage per roll precisely because there is no standard figure.
The index measures the material itself, which is the part that moves with the market instead of with your product choice.
The index is BLS series WPU139201, pulled monthly through the free FRED API. Percentages compare the latest month against the same month a year earlier, and against the 2024 annual average. Nothing is smoothed and nothing is estimated.
One caveat worth stating: a producer price index measures what manufacturers charge, not what you pay at the counter. Retail markup, freight, and local supply all sit on top and move on their own schedule. Use this to see which way the market is going, not to predict a quote.
Citing this page
Cite these figures anywhere. A link back to this page is all we ask.
CalcRafter Insulation Price Index. Envelope insulation PPI: 269.549 (July 2026), -1.8% year over year. Retrieved from https://calcrafter.com/insulation-price-index/