From Johns Manville:
Johns Manville is announcing a price increase effective January 16, 2023. The price increase applies to the following products:
JM Corbond® III 6%
JM Corbond® IV 6%
This price increase will apply to all orders shipped on and after January 16, 2023 regardless of the date of order placement. Please check with your Customer Advocate as this date approaches for information on current product lead times.
Download official letter HERE