UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

November 3, 2013

(Date of earliest event reported)

WEYERHAEUSER COMPANY

(Exact name of registrant as specified in charter)

Federal Way, Washington 98063-9777

(Address of principal executive offices)

(zip code)

Registrant’s telephone number, including area code:

(253) 924-2345

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

ITEM 1.01. ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT

On November 4, 2013, Weyerhaeuser Company (“Weyerhaeuser” or the “Company”) announced that the Company and Weyerhaeuser Real Estate Company, an indirect wholly owned subsidiary of the Company (“WRECO”), had entered into a Transaction Agreement dated as of November 3, 2013 (the “Transaction Agreement”) with TRI Pointe Homes, Inc. (“TRI Pointe”) and one of TRI Pointe’s subsidiaries, Topaz Acquisition, Inc. (“Merger Sub”).

Pursuant to the Transaction Agreement, Weyerhaeuser will distribute all the shares of common stock of WRECO (the “WRECO Common Shares”) to its shareholders (i) on a pro rata basis, (ii) in an exchange offer or (iii) in a combination thereof (the “Distribution”). Weyerhaeuser will determine which approach it will take to consummate the Distribution prior to closing the transaction and no decision has been made at this time. Immediately following the Distribution, Merger Sub will merge with and into WRECO (the “Merger”), with WRECO surviving the Merger and becoming a wholly owned subsidiary of TRI Pointe. As a result of the Merger, the common stock of TRI Pointe (the “TRI Pointe Common Stock”) will be held as follows:

The foregoing calculations are based upon closing prices as of November 1, 2013.

Prior to the Distribution, Weyerhaeuser will cause certain assets relating to Weyerhaeuser’s real estate business to be transferred to, and certain liabilities relating to Weyerhaeuser’s real estate business to be assumed by, WRECO and its subsidiaries and cause certain assets of WRECO that will be excluded from the transaction to be transferred to, and certain liabilities that will be excluded from the transaction to be assumed by, Weyerhaeuser and its subsidiaries. Under the terms of the Transaction Agreement, certain assets and liabilities of WRECO and its subsidiaries relating to Weyerhaeuser’s real estate business will be excluded from the transaction and retained by the Company, including assets and liabilities relating to a large master planned community north of Las Vegas, Nevada.

On November 3, 2013, WRECO and certain financial institutions executed a commitment letter pursuant to which the financial institutions have agreed to provide debt financing to WRECO in an aggregate principal amount of $800 million on the terms and conditions set forth therein. WRECO will use the proceeds of the debt financing to pay approximately $700 million in cash to Weyerhaeuser NR Company, a wholly owned subsidiary of Weyerhaeuser, which cash will be retained by Weyerhaeuser after consummation of the transaction. The amount of the cash payment is subject to adjustment based on the terms set forth in the Transaction Agreement.

Consummation of the transaction is subject to customary closing conditions, including the absence of certain legal impediments to the consummation of the transaction, the expiration or termination of the required waiting periods under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, the effectiveness of certain filings with the Securities and Exchange Commission, approval of the Merger by the stockholders of TRI Pointe and the receipt of certain tax opinions. The Merger is not subject to approval by the shareholders of Weyerhaeuser. The Transaction Agreement contains certain termination rights for both Weyerhaeuser and TRI Pointe and further provides that TRI Pointe must pay to Weyerhaeuser a termination fee in an amount set forth in the Transaction Agreement or reimburse certain expenses upon termination of the Transaction Agreement under specified circumstances.

In connection with the transaction, Weyerhaeuser has entered into Voting Agreements (the “Voting Agreements”) with certain stockholders of TRI Pointe with respect to an aggregate of 12,639,163 shares of TRI Pointe Common Stock, representing approximately 40% of the currently outstanding shares of TRI Pointe Common Stock. The Voting Agreements provide, among other things, that the stockholders party thereto will:

In connection with the transaction, Weyerhaeuser will enter into a Tax Sharing Agreement (the “Tax Sharing Agreement”) with WRECO and TRI Pointe prior to consummating the Distribution.

The Transaction Agreement is filed hereto as Exhibit 2.1, the Voting Agreements are filed hereto as Exhibits 10.1 to 10.4 and a form of the Tax Sharing Agreement is filed hereto as Exhibit 10.5, each of which is incorporated herein by reference. The foregoing descriptions of the Transaction Agreement, the Voting Agreements, the Tax Sharing Agreement and the transaction do not purport to be complete and are qualified in their entirety by reference to the Transaction Agreement, the Voting Agreements and the Tax Sharing Agreement. The Transaction Agreement, Voting Agreements and form of Tax Sharing Agreement have been included to provide you with information regarding their terms. They are not intended to provide any other factual information about Weyerhaeuser, TRI Pointe, the other parties thereto, or any of their respective businesses.

The Transaction Agreement contains representations and warranties that Weyerhaeuser and WRECO, on the one hand, and TRI Pointe and Merger Sub on the other hand, made to each other as of specific dates. The assertions embodied in those representations and warranties were made solely for purposes of the contract between the parties to the Transaction Agreement and may be subject to important qualifications and limitations agreed by the parties in connection with negotiating the terms of the contract. Moreover, some of those representations and warranties may not be accurate or complete as of any specified date, may be subject to a contractual standard of materiality different from those generally applicable to shareholders, or may have been used for the purpose of allocating risk between the parties rather than establishing matters as facts. For the foregoing reasons, such representations and warranties should not be relied upon as statements of factual information.

ITEM 8.01. OTHER EVENTS

On November 4, 2013, the Company issued a press release announcing the transaction. A copy of the press release is filed hereto as Exhibit 99.1 and is incorporated herein by reference.

* * * * *

Forward-Looking Statements. This report contains statements concerning Weyerhaeuser Company (“Weyerhaeuser”) and TRI Pointe Homes, Inc. (“TRI Pointe”) that are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are based on various assumptions and the current expectations of the management of Weyerhaeuser and TRI Pointe, and may not be accurate because of risks and uncertainties surrounding these assumptions and expectations. Factors listed below, as well as other factors, may cause actual results to differ significantly from these forward-looking statements. There is no guarantee that any of the events anticipated by these forward-looking statements will occur. If any of the events occur, there is no guarantee what effect they will have on the operations or financial condition of Weyerhaeuser or TRI Pointe. Forward-looking statements included herein are made as of the date hereof, and Weyerhaeuser and TRI Pointe undertake no obligation to publicly update or revise any forward-looking statement unless required to do so by the federal securities laws.

Some forward-looking statements discuss Weyerhaeuser’s and TRI Pointe’s plans, strategies and intentions. They use words such as “expects,” “may,” “will,” “believes,” “should,” “would,” “could,” “approximately,” “anticipates,” “estimates,” “targets,” “intends,” “likely,” “projects,” “positioned,” “strategy,” “future,” and “plans.” In addition, these words may use the positive or negative or other variations of those terms. Forward-looking statements in this report include statements regarding the expected effects on Weyerhaeuser, Weyerhaeuser Real Estate Company (“WRECO”) and TRI Pointe of the proposed distribution of WRECO to Weyerhaeuser’s shareholders and merger of WRECO with a subsidiary of TRI Pointe (the “Transaction”), the anticipated timing and benefits of the Transaction and whether the Transaction will be tax-free for Weyerhaeuser and its shareholders for U.S. federal income tax purposes. Forward-looking statements also include all other statements in this report that are not historical facts.

These statements are based on the current expectations of the management of Weyerhaeuser and TRI Pointe (as the case may be) and are subject to uncertainty and to changes in circumstances. Major risks, uncertainties and assumptions include, but are not limited to: the satisfaction of the conditions to the Transaction and other risks related to the completion of the Transaction and actions related thereto; Weyerhaeuser’s and TRI Pointe’s ability to complete the Transaction on the anticipated terms and schedule, including the ability to obtain shareholder and regulatory approvals and the anticipated tax treatment of the Transaction and related transactions; risks relating to any unforeseen changes to or effects on liabilities, future capital expenditures, revenues, expenses, earnings, synergies, indebtedness, financial condition, losses and future prospects; TRI Pointe’s ability to integrate WRECO successfully after the closing of the Transaction and to achieve anticipated synergies; the risk that disruptions from the Transaction will harm Weyerhaeuser’s or TRI Pointe’s businesses; the effect of general economic conditions, including employment rates, housing starts, interest rate levels, availability of financing for home mortgages, and the strength of the U.S. dollar; and other factors described under “Risk Factors” in each of Weyerhaeuser’s and TRI Pointe’s Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q. However, it is not possible to predict or identify all such factors. Consequently, while the list of factors presented here is considered representative, no such list should be considered to be a complete statement of all potential risks and uncertainties.

Additional Information and Where to Find It. In connection with the proposed “Reverse Morris Trust” transaction between TRI Pointe Homes, Inc. (“TRI Pointe”) and Weyerhaeuser Company (“Weyerhaeuser”), pursuant to which the homebuilding subsidiary of Weyerhaeuser, Weyerhaeuser Real Estate Company (“WRECO”) (with certain exclusions), will be combined with TRI Pointe, TRI Pointe will file a registration statement on Form S-4 with the Securities and Exchange Commission (“SEC”), which will include a prospectus. TRI Pointe will also file a proxy statement which will be sent to the TRI Pointe shareholders in connection with their vote required in connection with the transaction. In addition, WRECO expects to file a registration statement in connection with its separation from Weyerhaeuser. Investors and security holders are urged to read the proxy statement and registration statement/prospectus and any other relevant documents when they become available, because they will contain important information about TRI Pointe, the real estate business of Weyerhaeuser and the proposed transaction. The proxy statement and registration statement/prospectus and other documents relating to the proposed transaction (when they are available) can be obtained free of charge from the SEC’s website at www.sec.gov. These documents (when they are available) can also be obtained free of charge from Weyerhaeuser upon written request to Weyerhaeuser Company, 33663 Weyerhaeuser Way South, Federal Way, Washington 98003, Attention: Vice President, Investor Relations, or by calling (800) 561-4405, or from TRI Pointe upon written request to TRI Pointe Homes, Inc., 19520 Jamboree Road, Irvine, California 92612, Attention: Investor Relations, or by calling (949) 478-8696.

Participants in the Solicitation . This communication is not a solicitation of a proxy from any security holder of TRI Pointe Homes, Inc. (“TRI Pointe”) or Weyerhaeuser Company (“Weyerhaeuser”). However, Weyerhaeuser, TRI Pointe and certain of their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from TRI Pointe’s shareholders in connection with the proposed transaction. Information about the Weyerhaeuser’s directors and executive officers may be found in its Annual Report on Form 10-K for the year ended December 31, 2012 filed with the Securities and Exchange Commission (“SEC”) on February 19, 2013 and the definitive proxy statement relating to its 2013 Annual Meeting of Shareholders filed with the SEC on February 26, 2013. Information about the TRI Pointe’s directors and executive officers may be found in its Annual Report on Form 10-K for the year ended December 31, 2012 filed with the SEC on March 28, 2013. These documents can be obtained free of charge from the sources indicated above. Additional information regarding the direct and indirect interests of these participants, whether by security holdings or otherwise, will be included in the registration statement/prospectus, proxy statement and other relevant materials to be filed with the SEC when they become available.

ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: November 4, 2013