SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                ---------------

                                 SCHEDULE TO/A
                                (RULE 14d-100)

                     TENDER OFFER STATEMENT UNDER SECTION
          14(d)(1) OR 13(e)(1) OF THE SECURITIES EXCHANGE ACT OF 1934

                               (AMENDMENT NO. 2)

                          JOHNS MANVILLE CORPORATION
                      (Name of Subject Company (Issuer))

                      J ACQUISITION CORPORATION (OFFEROR)
                   BERKSHIRE HATHAWAY INC. (OFFEROR PARENT)
   (Names of Filing Persons (identifying status as offeror, issuer or other
                                   person))

                    COMMON STOCK, PAR VALUE $0.01 PER SHARE
                        (Title of Class of Securities)

                                  478129 10 9
                     (CUSIP Number of Class of Securities)

                                ---------------

                                MARC D. HAMBURG
                                VICE PRESIDENT
                            BERKSHIRE HATHAWAY INC.
                               1440 KIEWIT PLAZA
                               OMAHA, NE  68131
                          TELEPHONE:  (402) 346-1400
(Name, address and telephone number of person authorized to receive notices and
                  communications on behalf of filing persons)

                                ---------------

                                   COPY TO:
                            R. GREGORY MORGAN, ESQ.
                          MUNGER, TOLLES & OLSON LLP
                            355 SOUTH GRAND AVENUE
                            LOS ANGELES, CA  90071
                          TELEPHONE:  (213) 683-9100


                                ---------------
                           CALCULATION OF FILING FEE

TRANSACTION VALUATION*                                      AMOUNT OF FILING FEE
--------------------------------------------------------------------------------

$1,724,196,708                                             $344,840

--------------------------------------------------------------------------------

*  Estimated for purposes of calculating the amount of the filing fee only. The
amount assumes the purchase of a total of 132,630,516 shares of the outstanding
common stock, par value $0.01 per share, of the Subject Company ("Subject
Company Common Stock") at an offer price of $13.00 per share. The number of
outstanding shares of Subject Company Common Stock has been calculated by
subtracting the 4,786,900 shares of Subject Company Common Stock beneficially
owned by Offeror Parent from the 137,417,416 shares of Subject Company Common
Stock outstanding as of December 28, 2000.

[X]  Check the box if any part of the fee is offset as provided by Rule 0-
11(a)(2) and identify the filing with which the offsetting fee was previously
paid.  Identify the previous filing by registration statement number, or the
Form or Schedule and the date of its filing.

Amount Previously Paid:  $344,840.

Form or Registration No.:  Schedule TO

Filing Party:  Berkshire Hathaway Inc. and J Acquisition Corporation

Date Filed:  December 29, 2000

[_]  Check the box if the filing relates solely to preliminary communications
made before the commencement of a tender offer.

Check the appropriate boxes below to designate any transactions to which the
statement relates:

[X]  third-party tender offer subject to Rule 14d-1.

[_]  issuer tender offer subject to Rule 13e-4.

[_]  going-private transaction subject to Rule 13e-3.

[_]  amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results
of the tender offer:  [_]

                                    Page 2


     This Amendment No. 2 amends and supplements the Tender Offer Statement on
Schedule TO filed by J Acquisition Corporation ("Purchaser"), a Delaware
corporation, and by Berkshire Hathaway Inc. ("Berkshire"), a Delaware
corporation and Purchaser's parent corporation, on December 29, 2000, as amended
and supplemented by Amendment No. 1 to Schedule TO, filed by Purchaser and
Berkshire on January 16, 2001 (such Schedule TO and such Amendment No. 1 to
Schedule TO being collectively referred to herein as the "Schedule TO").

     The Schedule TO relates to the offer by Purchaser to purchase any and all
of the outstanding shares of common stock, par value $0.01 per share, of Johns
Manville Corporation (the "Company"), a Delaware corporation, at a purchase
price of $13.00 per share, net to the seller in cash, upon the terms and subject
to the conditions set forth in the Offer to Purchase (the "Offer to Purchase")
and in the related Letter of Transmittal, copies of which are attached to the
Schedule TO as Exhibits (a)(1) and (a)(2).

ITEM 4. TERMS OF THE TRANSACTION.

     Item 4 of the Schedule TO is hereby amended and supplemented by including
the following information:

          Purchaser and Berkshire have extended the Expiration Date of the Offer
     until 5:00 p.m., New York City time, on February 14, 2001.

ITEM 12. EXHIBITS.

     Item 12 of the Schedule TO is hereby amended and supplemented by including
the following:

(a)(9) Text of press release issued by Berkshire, dated January 29, 2001.

                                    Page 3


                                   SIGNATURE


     After due inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

                                    J ACQUISITION CORPORATION



                                    By  /s/ Marc D. Hamburg
                                    ____________________________________
                                    Name:   Marc D. Hamburg
                                    Title:  President, Secretary and Treasurer



                                    BERKSHIRE HATHAWAY INC.


                                    By  /s/ Marc D. Hamburg
                                    ____________________________________
                                    Name:   Marc D. Hamburg
                                    Title:  Vice President and
                                            Chief Financial Officer


Dated:  January 29, 2001

                                    Page 4


                                 EXHIBIT INDEX

* (a)(1) Offer to Purchase, dated December 29, 2000.

* (a)(2) Form of Letter of Transmittal.

* (a)(3) Form of Notice of Guaranteed Delivery.

* (a)(4) Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies
and Other Nominees.

* (a)(5) Form of Letter to Clients for use by Brokers, Dealers, Commercial
Banks, Trust Companies and Other Nominees.

* (a)(6) Text of joint press release issued by Berkshire and the Company dated
December 20, 2000 (incorporated by reference from the Tender Offer Statement on
Schedule TO filed by Berkshire with the Securities and Exchange Commission on
December 20, 2000).

* (a)(7) Guidelines for Certification of Taxpayer Identification Number on
Substitute Form W-9.

* (a)(8) Form of summary advertisement, dated December 29, 2000.

  (a)(9) Text of press release issued by Berkshire and the Company, dated
January 29, 2001.

* (d)(1) Agreement and Plan of Merger, dated as of December 19, 2000, among
Berkshire, Purchaser and the Company (incorporated herein by reference to
Exhibit 2.1 of the Current Report on Form 8-K filed by the Company with the
Securities and Exchange Commission on December 22, 2000).

* (d)(2) Stockholder Agreement, dated as of December 19, 2000, among Berkshire,
Purchaser and the Manville Personal Injury Settlement Trust (incorporated herein
by reference to Exhibit 2.3 of the Current Report on Form 8-K filed by the
Company with the Securities and Exchange Commission on December 22, 2000).

* (d)(3) Amended and Restated Tax Matters and Amended Trust Relationship
Agreement, dated as of December 19, 2000, by and between the Company and the
Manville Personal Injury Settlement Trust (incorporated herein by reference to
Exhibit 2.2 of the Current Report on Form 8-K filed by the Company with the
Securities and Exchange Commission on December 22, 2000).

* (d)(4) Share Purchase Agreement, dated as of December 19, 2000, by and between
the Company and the Manville Personal Injury Settlement Trust (incorporated
herein by reference to Exhibit 2.4 of the Current Report on Form 8-K filed by
the Company with the Securities and Exchange Commission on December 22, 2000).

* (d)(5) Letter Agreement, dated as of December 19, 2000, by and between the
Company and the Manville Personal Injury Settlement Trust (incorporated herein
by reference to Exhibit 4 to

                                    Page 5


Amendment No. 18 to the Schedule 13D filed by the Manville Personal Injury
Settlement Trust with the Securities and Exchange Commission on December 22,
2000).

* Previously filed

                                    Page 6