Exhibit 99.6 Appendix 3Y Change of Director’s Interest Notice

Rule 3.19A.2

Appendix 3Y

Change of Director’s Interest Notice

Information or documents not available now must be given to ASX as soon as available. Information and documents given to ASX become ASX’s property and may be made public.

Introduced 30/09/01 Amended 01/01/11

Name of entity			James Hardie Industries plc
ARBN			097 829 895

We (the entity) give ASX the following information under listing rule 3.19A.2 and as agent for the director for the purposes of section 205G of the Corporations Act.

Name of Director			Renee Peterson
Date of last notice			22 September 2025

Part 1 - Change of director’s relevant interests in securities

In the case of a trust, this includes interests in the trust made available by the responsible entity of the trust

Note: In the case of a company, interests which come within paragraph (i) of the definition of “notifiable interest of a director” should be disclosed in this part.

Direct or indirect interest			Direct
Nature of indirect interest (including registered holder) Note: Provide details of the circumstances giving rise to the relevant interest.			n/a
Date of change			15 December 2025
No. of securities held prior to change			Direct: 12,502 Ordinary Shares
Class			Ordinary Shares
Number acquired			2,332 Ordinary Shares
Number disposed			Nil
Value/Consideration Note: If consideration is non-cash, provide details and estimated valuation			US$42,955.44
No. of securities held after change			Current relevant interest is: Direct: 14,834 Ordinary Shares
Nature of change Example: on-market trade, off-market trade, exercise of options, issue of securities under dividend reinvestment plan, participation in buy-back			Issuance of Ordinary Shares pursuant to the terms of the James Hardie 2020 Non-Executive Director Equity Plan.

+ See chapter 19 for defined terms.

Appendix 3Y Page 1    01/01/2011

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Appendix 3Y Change of Director’s Interest Notice

Part 2 – Change of director’s interests in contracts

Note: In the case of a company, interests which come within paragraph (ii) of the definition of “notifiable interest of a director” should be disclosed in this part.

Detail of contract			Not applicable
Nature of interest			Not applicable
Name of registered holder (if issued securities)			Not applicable
Date of change			Not applicable
No. and class of securities to which interest related prior to change Note: Details are only required for a contract in relation to which the interest has changed			Not applicable
Interest acquired			Not applicable
Interest disposed			Not applicable
Value/Consideration Note: If consideration is non-cash, provide details and an estimated valuation			Not applicable
Interest after change			Not applicable

Part 3 – +Closed period

Were the interests in the securities or contracts detailed above traded during a +closed period where prior written clearance was required?