China National Building Material : VOLUNTARY ANNOUNCEMENT - RESULTS FORECAST OF SINOMA INTERNATIONAL FOR THE THREE MONTHS ENDING 31 MARCH 2021 PURSUANT TO REGULATIONS OF THE SHANGHAI STOCK EXCHANGE

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(a joint stock limited company incorporated in the People's Republic of China with limited liability of its members)

VOLUNTARY ANNOUNCEMENT

RESULTS FORECAST OF SINOMA INTERNATIONAL FOR THE

THREE MONTHS ENDING 31 MARCH 2021 PURSUANT TO

REGULATIONS OF

THE SHANGHAI STOCK EXCHANGE

This announcement is made by China National Building Material Company Limited* (the "Company") on a voluntary basis. The issue of the Sinoma International Announcement (as defined below) containing the Sinoma International Results Forecast (as defined below) is solely due to the relevant regulations of the Shanghai Stock Exchange.

Reference is made to the announcement of Sinoma International Engineering Co., Ltd.* (a subsidiary of the Company and whose A shares are listed and traded on the Shanghai Stock Exchange (stock code: 600970), "Sinoma International") dated 25 March 2021 (the "Sinoma International Announcement") in relation to the results forecast attributable to the shareholders of Sinoma International for the three months ended 31 March 2021 (the "Sinoma International Results Forecast") (available athttp://www.cninfo.com.cnfor details and for reference only).

RESULTS FORECAST OF SINOMA INTERNATIONAL FOR THE THREE MONTHS ENDING 31 MARCH 2021

• 1. Sinoma International Results Forecast

  Relevant period of the Sinoma International results forecast: 1 January 2021 to 31 March 2021

  Currency: RMB

  Results forecast for this reporting period

  (as compared to the statutory disclosure of data for theFinancial data for the same

  same period period of last yearof last year)

  (1 January 2021 to 31 March 2021)

  (1 January 2020 to

  31 March 2020)Increase during this reporting period as compared with the same period of last year

  Net profit/(net losses) attributable to shareholders of Sinoma InternationalAn increase ranging from 116.9 million to 150.3 million

  167 million

  Increased by 70% to 90%Net profit attributable to shareholders of

  Sinoma International after deducting extraordinary gains or losses

  An increase ranging from 107.11 million to 137.72 million

  153.02 millionIncreased by 70% to 90%Basic earnings/(losses) per share

  -

  0.10

  -

• 2. Audit status of the Sinoma International Results Forecast

  The results forecast for this period is a preliminary forecast made by Sinoma International based on its operation conditions, and has not been audited by an accounting firm.

• 3. Explanations on changes in results of Sinoma International

  In the first quarter of 2020, when the COVID-19 pandemic broke out in China and the pandemic was in a severe situation, Sinoma International's domestic projects or businesses ceased operation and production consecutively, resulting in a significant impact on its revenue and profit. In the first quarter of 2021, Sinoma International kept conducting the onshore and offshore pandemic prevention and control and the full resumption of operation and production, the domestic and overseas projects were in sound operation, and the revenue and profit of Sinoma International's business lines including engineering business, equipment manufacturing and environmental protection all achieved a significant growth.

• 4. Risk warning

  There are no significant uncertainties with Sinoma International affecting the accuracy of this results forecast.

• 5. Other information

  The above statistics in the forecast are preliminary accounting data only. For detailed and accurate financial data, please refer to the first quarterly report of 2021 to be officially disclosed by Sinoma International. Investors are advised to pay attention to investment risks.

By order of the Board

China National Building Material Company Limited*

Yu Kaijun

Secretary of the Board

Beijing, the PRC

25 March 2021

As at the date of this announcement, the board of directors of the Company comprises Mr. Cao Jianglin, Mr. Peng Shou, Mr. Cui Xingtai and Mr. Fu Jinguang as executive directors, Ms. Zhan Yanjing, Mr. Chang Zhangli, Mr. Tao Zheng, Mr. Chen Yongxin, Mr. Shen Yungang and Ms. Fan Xiaoyan as non-executive directors and Mr. Sun Yanjun, Mr. Liu Jianwen, Mr. Zhou Fangsheng, Mr. Li Jun and Ms. Xia Xue as independent non-executive directors.

* For identification purposes only