On December 10, 2025, Armstrong World Industries, Inc. (?AWI?) entered into a first amendment to second amended and restated credit agreement (the ?First Amendment?), by and among AWI, as the borrower, certain subsidiaries of AWI identified therein as guarantors, Bank of America, N.A., as the administrative agent, the collateral agent, a letter of credit issuer and the swing line lender, Citizens Bank, N.A., Manufacturers & Traders Trust Company, PNC Bank, National Association, TD Bank, N.A., and Truist Bank, as co-syndication agents, JPMorgan Chase Bank, N.A., and First National Bank of Pennsylvania, as co-documentation agents, BofA Securities, Inc., Citizens Bank, N.A., Manufacturers & Traders Trust Company, PNC Capital Markets, LLC, TD Bank, N.A., and Truist Securities, Inc., as joint lead arrangers and joint bookrunners and the other lenders and letter of credit issuers party thereto. The First Amendment amends that certain second amended and restated credit agreement, dated as of December 7, 2022, as amended, among AWI, as the borrower, certain subsidiaries of AWI, as the guarantors thereunder, Bank of America, N.A., as the administrative agent, and the other lenders and institutions from time to time party thereto (the ?2022 Credit Agreement?; and the 2022 Credit Agreement as amended by the First Amendment, the ?Amended Credit Agreement?). The Amended Credit Agreement provides AWI with a $500 million revolving credit facility (the ?Revolving Credit Facility?), with sublimits for letters of credit and swing line loans, and a $410,625,000 term loan (the ?Term Loan?).

The Revolving Credit Facility and the Term Loan are referred to as the ?Amended Credit Facilities.? The Revolving Credit Facility and the Term Loan are scheduled to mature on December 10, 2030.