Exhibit 4.9  FOURTH SUPPLEMENTAL
INDENTURE  FOURTH
SUPPLEMENTAL INDENTURE, dated as of February 21, 2007 between Building
Materials Corporation of America, a Delaware corporation (the Company), the
Guarantors signatory hereto (the Guarantors), and Wilmington Trust
Company, as trustee under the Indenture referred to below (the Trustee).  W I T N E S S E T H :  WHEREAS,
the Indenture dated as of July 26, 2004, as amended by the First
Supplemental Indenture dated as of December 26, 2006, as further amended
by the Second Supplemental Indenture dated as of December 29, 2006, and as
further amended by the Third Supplemental Indenture dated as of December 29,
2006 (collectively and as further amended and supplemented, the Indenture),
was executed and delivered by the Company, the Guarantors named therein and the
Trustee, providing for the issuance of the 7.75% Senior Notes Due 2014 and the Series B
7.75% Senior Notes Due 2014 (collectively, the Securities);  WHEREAS,
the Company desires and has requested the Trustee to join with it and the
Guarantors in the execution and delivery of this Fourth Supplemental Indenture;  WHEREAS,
Section 9.01(1) of the Indenture provides that the Company, the
Guarantors and the Trustee may amend the Indenture and the Securities without
notice to or consent of any Holders of the Securities to cure any ambiguity,
omission, defect or inconsistency; and  WHEREAS,
this Fourth Supplemental Indenture has been duly authorized by all necessary
corporate action on the part of the Company and the Guarantors.  NOW,
THEREFORE, in consideration of the premises set forth above and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
Company, the Guarantors and the Trustee mutually covenant and agree for the
equal and ratable benefit of the Holders as follows:  ARTICLE I  Amendments to Indenture  Section 1.1.  Unless otherwise specifically defined herein,
each term used herein which is defined in the Indenture shall have the meaning
assigned to such term in the Indenture.  Section 1.2.Effective as of the date hereof, Section 4.11
of the Indenture is hereby amended by adding at the end of said section the
following sentence:


For the avoidance of
ambiguity, it is understood that Liens referred to in clauses (1) through (9) of
this Section 4.11(b) may secure, in addition to the principal of any
indebtedness referred to in such clauses, interest, fees and all other
obligations on and in respect of such Debt that have been or are customarily
secured together with such Debt.  Section 1.3.  The Trustee hereby accepts this Fourth
Supplemental Indenture and agrees to perform the same under terms and
conditions set forth in the Indenture.  ARTICLE II  Miscellaneous  Section 2.1.  Effect of Fourth Supplemental Indenture.  Upon the execution and delivery of this
Fourth Supplemental Indenture by the Company, the Guarantors and the Trustee,
the Indenture shall be supplemented in accordance herewith, and this Fourth
Supplemental Indenture shall form a part of the Indenture for all purposes, and
every Holder of Securities heretofore or hereafter authenticated and delivered
under the Indenture shall be bound thereby.  Section 2.2.  Indenture Remains in Full Force and Effect.  Except as supplemented hereby, all provisions
in the Indenture shall remain in full force and effect.  Section 2.3.  Indenture and Fourth Supplemental
Indenture Construed Together.  This
Fourth Supplemental Indenture is an indenture supplemental to in and
implementation of the Indenture, and the Indenture and this Fourth Supplemental
Indenture shall henceforth be read and construed together.  Section 2.4.  Confirmation and Preservation of Indenture.  The Indenture as supplemented by this Fourth
Supplemental Indenture is in all respects confirmed and preserved.  Section 2.5.  Conflict with Trust Indenture Act.  If any provision of this Fourth Supplemental
Indenture limits, qualifies or conflicts with any provision of the TIA that is
required under the TIA to be part of and govern any provision of this Fourth
Supplemental Indenture, the provision of the TIA shall control.  If any provision of this Fourth Supplemental
Indenture modifies or excludes any provision of the TIA that may be so modified
or excluded, the provision of the TIA shall be deemed to apply to the Indenture
as so modified or to be excluded by this Fourth Supplemental Indenture, as the
case may be.  Section 2.6.  Severability.  In case any provision in this Fourth
Supplemental Indenture shall be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any way be
affected or impaired thereby.  2


Section 2.7.  Benefits of Fourth Supplemental Indenture.  Nothing in this Fourth Supplemental Indenture
or the Securities, express or implied, shall give to any Person, other than the
parties hereto and thereto and their successors hereunder and thereunder and
the Holders of the Securities, any benefit of any legal or equitable right, remedy
or claim under the Indenture, this Fourth Supplemental Indenture or the
Securities.  Section 2.8.  Successors.  All agreements of the Company and the
Guarantors in this Fourth Supplemental Indenture shall bind its successors
except as provided in the Indenture.  All
agreements of the Trustee in this Fourth Supplemental Indenture shall bind its
successors.  Section 2.9.  Certain Duties and Responsibilities of the
Trustee.  In entering into this
Fourth Supplemental Indenture, the Trustee shall be entitled to the benefit of
every provision of the Indenture and the Securities relating to the conduct or
affecting the liability or affording protection to the Trustee, whether or not
elsewhere herein so provided.  Section 2.10.  Governing Law.  This Fourth Supplemental Indenture shall be
governed by, and construed in accordance with, the laws of the State of New
York. The Trustee, the Company, the Guarantors and the Securityholders agree to
submit to the jurisdiction of the courts of the State of New York in any action
or proceeding arising out of or relating to the Indenture, this Fourth
Supplemental Indenture or the Securities.  Section 2.11.  Multiple Originals.  The parties may sign any number of copies of
this Fourth Supplemental Indenture.  Each
signed copy shall be an original, but all of them together represent the same
agreement.  One signed copy is enough to
prove this Fourth Supplemental Indenture.  Section 2.12.  Headings.  The Article and Section headings
herein have been inserted for convenience of reference only, are not intended
to be considered a part hereof and shall not modify or restrict any of the
terms or provisions hereof.  3


IN
WITNESS WHEREOF, the parties hereto have caused this Fourth Supplemental
Indenture to be duly executed as of the date first written above.  CompanyBUILDING
  MATERIALSCORPORATION
  OF AMERICABy:
  /s/ John MaitnerName:  John
  MaitnerTitle:    Vice
  President, TreasurerGuarantorsBMCA ACQUISITION INC.BMCA ACQUISITION SUB. INC.BMCA GAINESVILLE LLCBMCA INSULATION PRODUCTS
  INC.BMCA QUAKERTOWN INC.BUILDING MATERIALS
  INVESTMENTCORPORATIONBUILDING MATERIALSMANUFACTURING CORPORATIONDUCTWORK MANUFACTURINGCORPORATIONGAF LEATHERBACK CORP.GAF MATERIALS CORPORATION(CANADA)GAF PREMIUM PRODUCTS INC.GAF REAL PROPERTIES, INC.GAFTECH CORPORATIONHBP ACQUISITION LLCLL BUILDING PRODUCTS INC.PEQUANNOCK VALLEY CLAIMSERVICE COMPANY, INC.SOUTH PONCA REALTY CORP.WIND GAP REAL PROPERTYACQUISITION CORP.By:
  /s/ John MaitnerName:  John
  MaitnerTitle:    Vice
  President, Treasurer


TrusteeWILMINGTON
  TRUST COMPANYBy:
  /s/ Kristin L. MooreName:  Kristin
  L. MooreTitle:    Senior
  Financial Services Officer