EXHIBIT 3.29

   STATE OF DELAWARE
  SECRETARY OF STATE
DIVISION OF CORPORATIONS
FILED 09:00 AM 07/13/1999
  991285756 -- 3068901

                            CERTIFICATE OF FORMATION
                                       OF
                               SWAIN BUILDING, LLC

         This Certificate of Formation of Swain Building, LLC (the "Company"),
dated as of the 13th day of July, 1999, is being duly executed and filed by the
undersigned, as an authorized person, to form a limited liability company under
the Delaware Limited Liability Company Act (6 Del.C. Section 18-101, et seq.).

         1.       The name of the limited liability company formed hereby is
                  Swain Building, LLC.

         2.       The address of the registered office of the Company in the
                  State of Delaware is 1013 Centre Road, Wilmington, Delaware
                  19805.

         3.       The name and address of the registered agent for service of
                  process on the Company in the State of Delaware is Corporation
                  Service Company, 1013 Centre Road, Wilmington, Delaware 19805.

         IN WITNESS WHEREOF, the undersigned has executed this Certificate of
Formation as of the date first above written.

                                        By: /s/Edward K. Clark
                                            ----------------------------------
                                            Edward K. Clark, Authorized Person



                                                         STATE OF DELAWARE
                                                         SECRETARY OF STATE
                                                       DIVISION OF CORPORATIONS
                                                       FILED 09:00 AM 02/17/2000
                                                         001084178 -- 3068901

                   FIRST AMENDMENT TO CERTIFICATE OF FORMATION
                                       OF
                               SWAIN BUILDING, LLC

         The undersigned, being a duly authorized person, on behalf of Swain
Building, LLC, a Delaware limited liability company, having filed an original
Certificate of Formation on July 13, 1999 (the "Certificate"), hereby duly
executes this First Amendment to the Certificate of the Company, which is being
filed with the Secretary of State of Delaware pursuant to the provisions of
Section 18-202 of the Delaware Limited Liability Company Act.

         1.       The name of the limited liability company is Swain Building,
                  LLC (the "Company").

         2.       The name of the Company has been changed.

         3.       Paragraph 1 of the Certificate is hereby deleted in its
                  entirety and replaced with the following Paragraph 1:

                  "1. The name of the limited liability company formed hereby is
                  Builders FirstSource -- MBS, LLC."

         4.       Paragraph 2 of the Certificate is hereby deleted in its
                  entirety and replaced with the following Paragraph 2:

                  "2. The address of the registered office of the Company in the
                  State of Delaware is 103 Foulk Road Suite 200; Wilmington, DE
                  19807.

         5.       Paragraph 3 of the Certificate is hereby deleted in its
                  entirety and replaced with the following Paragraph 3:

                  "3. The name and address of the registered agent for service
                  of process on the Company in the State of Delaware is Entity
                  Services Group, LLC, 103 Foulk Road, Suite 200, Wilmington,
                  Delaware, 19803, New Castle County."

                  SIGNED on this the 17th day of February, 2000.

                                        Swain Building, LLC
                                  Delaware limited liability company

                                  By: /s/ Andrew T. Panaccione
                                      ------------------------------------
                                      Andrew T. Panaccione, Vice President