Exhibit 4.41.6

Translation into English for the benefit of Wilmington Trust

Monterrey,
Nuevo León, April 5, 2011

Banco Nacional de México, S.A.,

Integrante del Grupo Financiero Banamex,

División Fiduciaria

Calzada del Valle No. 350 Oriente

1er.
Piso

Col. Del Valle

San Pedro Garza
García, Nuevo León 66220

Mexico

Attention: Nelly Wing

Wilmington Trust (London) Limited

6 Broad Street Place

Fifth Floor

London EC2M 7JH

United Kingdom

Attention: Elaine K. Lockhart

Reference is made to the Irrevocable Security Trust Agreement in Respect of Stock No. F/111388-5, dated September 3, 2009, as amended from time to time (the Agreement), entered
into among CEMEX, S.A.B. de C.V. (CEMEX SAB), Empresas Tolteca de México, S.A. de C.V. (Tolteca), Impra Café, S.A. de C.V. (Impra Café), Interamerican Investments, Inc.
(Interamerican), CEMEX México, S.A. de C.V. (CEMEX México), and Centro Distribuidor de Cemento, S.A. de C.V. (Cedice), as settlors (CEMEX SAB, Tolteca, Impra Café,
Interamerican, CEMEX México and Cedice, together, the Settlors); CEMEX México, Cedice, Mexcement Holdings, S.A. de C.V. (Mexcement) and Corporación Gouda, S.A. de C.V.
(Gouda), as issuers (CEMEX México, Cedice, Mexcement and Gouda, together, the Issuers); Banco Nacional de México, S.A., Integrante del Grupo Financiero Banamex, División Fiduciaria, in its
capacity as trustee (the Trustee); and Wilmington Trust (London) Limited, on its own behalf and in its capacity as Security Agent, for the benefit of the Participating Creditors, the Refinancing Creditors (and their respective
successors and assigns) and the other Secured Parties (the Beneficiary). Unless otherwise defined herein, capitalized terms defined in the Agreement, are used herein as therein defined.

On April 5, 2011, CEMEX, S.A.B. de C.V. issued U.S.$800,000,000 floating rate senior secured notes due September 30 2015 ,
guaranteed by CEMEX México, CEMEX España, S.A. and New Sunward Holding B.V. (together, the Additional Notes). Because the purpose of the Additional Notes is to refinance existing indebtedness and, as a consequence
thereof, the Additional Notes will be part of the Refinancing Debt and the holders of the Additional Notes will be a Refinancing Party, in both cases pursuant to the Agreement, by means of this letter the Settlors and the Issuers hereby inform the
Trustee and the Beneficiary, and confirm, that the Additional Notes are secured in accordance with the terms provided in the Agreement, and are part of the Secured Obligations and the holders of the Additional Notes are Secured Parties.



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We appreciate you acknowledging receipt of this letter, by signing in the space provided
below.



|                                             |  |                        
|-------------------------------------------- |  | -----------------------
|CEMEX, S.A.B. de C.V.                       
|                                             | 
|By                                           |  | /s/ Roger Saldaña      
|                                             |  | Name: Roger Saldaña    
|                                             |  | Title: Attorney-in-Fact
|                                            
|Empresas Tolteca de México, S.A. de C.V.    
|                                             | 
|By                                           |  | /s/ Roger Saldaña      
|                                             |  | Name: Roger Saldaña    
|                                             |  | Title: Attorney-in-Fact
|                                            
|Impra Café, S.A. de C.V.                    
|                                             | 
|By                                           |  | /s/ Roger Saldaña      
|                                             |  | Name: Roger Saldaña    
|                                             |  | Title: Attorney-in-Fact
|                                            
|Interamerican Investments, Inc.             
|                                             | 
|By                                           |  | /s/ Roger Saldaña      
|                                             |  | Name: Roger Saldaña    
|                                             |  | Title: Attorney-in-Fact
|                                            
|Cemex México, S.A. de C.V.                  
|                                             | 
|By                                           |  | /s/ Roger Saldaña      
|                                             |  | Name: Roger Saldaña    
|                                             |  | Title: Attorney-in-Fact
|                                            
|Centro Distribuidor de Cemento, S.A. de C.V.
|                                             | 
|By                                           |  | /s/ Roger Saldaña      
|                                             |  | Name: Roger Saldaña    
|                                             |  | Title: Attorney-in-Fact
|                                            
|Mexcement Holdings, S.A. de C.V.            
|                                             | 
|By                                           |  | /s/ Roger Saldaña      
|                                             |  | Name: Roger Saldaña    
|                                             |  | Title: Attorney-in-Fact



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|                                         |  |                        
|---------------------------------------- |  | -----------------------
|Corporación Gouda, S.A. de C.V.         
|                                         | 
|By                                       |  | /s/ Roger Saldaña      
|                                         |  | Name: Roger Saldaña    
|                                         |  | Title: Attorney-in-Fact
|                                        
|Acknowledgment of receipt:              
|                                        
|Banco Nacional de México, S.A.,         
|Integrante del Grupo Financiero Banamex,
|División Fiduciaria                     
|                                         | 
|By                                       |  | /s/ Elva Nelly Wing    
|                                         |  | Name: Elva Nelly Wing  
|                                         |  | Title: Trust Delegate  
|                                         |  | Date:                  
|                                        
|Wilmington Trust (London) Limited       
|                                         | 
|By                                       |  | /s/ Elaine Lockhart    
|                                         |  | Name: Elaine Lockhart  
|                                         |  | Title: Director        
|                                         |  | Date: 6/4/2011         



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