EX-4.5



 Exhibit 4.5 

EXECUTION COPY 
 THIS FIRST
SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), is dated as of October 3, 2014, among Ply Gem Industries, Inc. (the “Company”), Simonton Windows & Doors, Inc., a Delaware corporation, SimEx, Inc., a West
Virginia corporation, Simonton Building Products LLC, a Delaware limited liability company, Simonton Industries, Inc., a California corporation, and Simonton Windows, Inc., a West Virginia corporation (each, a “New Guarantor”), and Wells
Fargo Bank, National Association, a national banking association, as trustee (the “Trustee”). 
 RECITALS 

WHEREAS, the Company, Ply Gem Holdings, Inc. and the subsidiary guarantors party thereto (collectively, the “Guarantors”) and the
Trustee entered into an indenture, dated as of January 30, 2014 (the “Indenture”); 
 WHEREAS, the Company agreed pursuant to
the Indenture to cause any newly formed, newly acquired or newly designated Restricted Subsidiary (other than any Foreign Subsidiary) that guarantees any Indebtedness under any Credit Facility to provide Guarantees in certain circumstances; 

WHEREAS, this Supplemental Indenture has not resulted in a material modification of the Notes for purposes of the Foreign Account Tax
Compliance Act; and 
 WHEREAS, the Company, each New Guarantor and the Trustee are authorized to enter into this Supplemental Indenture.

 AGREEMENT 
 NOW,
THEREFORE, in consideration of the premises and mutual covenants herein contained and intending to be legally bound, the parties to this Supplemental Indenture hereby agree as follows: 

Section 1. Capitalized terms used herein and not otherwise defined herein are used as defined in the Indenture. 

Section 2. Each New Guarantor, by its execution of this Supplemental Indenture, agrees to be a Guarantor under the Indenture and to be
bound by the terms of the Indenture applicable to Guarantors, including, but not limited to, Article Eleven thereof. 
 Section 3. This
Supplemental Indenture shall be governed by and construed in accordance with the laws of the State of New York. 
 Section 4. This
Supplemental Indenture may be signed in various counterparts which together will constitute one and the same instrument. 
 Section 5.
This Supplemental Indenture is an amendment supplemental to the Indenture and the Indenture and this Supplemental Indenture will henceforth be read together. 







 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed on this 3rd day of October, 2014. 
  

			
	PLY GEM INDUSTRIES, INC.
		
	By:	 	 /s/ Shawn K. Poe

		 	Name: Shawn K. Poe
		 	 Title: Vice President, Chief Financial Officer,

          Treasurer and Secretary

	
	SIMONTON WINDOWS & DOORS, INC.
		
	By:	 	 /s/ Shawn K. Poe

		 	Name: Shawn K. Poe
		 	Title: Vice President
	
	SIMEX, INC.
		
	By:	 	 /s/ Shawn K. Poe

		 	Name: Shawn K. Poe
		 	Title: Vice President
	
	SIMONTON BUILDING PRODUCTS LLC
		
	By:	 	 /s/ Shawn K. Poe

		 	Name: Shawn K. Poe
		 	Title: Vice President
	
	SIMONTON INDUSTRIES, INC.
		
	By:	 	 /s/ Shawn K. Poe

		 	Name: Shawn K. Poe
		 	Title: Vice President
	
	SIMONTON WINDOWS, INC.
		
	By:	 	 /s/ Shawn K. Poe

		 	Name: Shawn K. Poe
		 	Title: Vice President



  
 [Signature Page to
Supplemental Indenture] 








 
			
	WELLS FARGO BANK, NATIONAL         ASSOCIATION,
		 	as Trustee
		
	By:	 	 /s/ Raymond Delli Colli

		 	Name: Raymond Delli Colli
		 	Title: Vice President



  
 [Signature Page to
Supplemental Indenture]