dated as of January 26, 2011 among PLY GEM INDUSTRIES, INC., PLY GEM HOLDINGS, INC., the Subsidiaries of the Specified U.S. Borrower from time to time party hereto and UBS AG, STAMFORD BRANCH, as Collateral Agent

Exhibit 4.27

U.S. GUARANTY

dated as of

January 26, 2011

among

PLY GEM INDUSTRIES, INC.,

PLY GEM HOLDINGS, INC.,

the Subsidiaries of the Specified U.S. Borrower

from time to time party hereto

and

UBS AG, STAMFORD BRANCH,

as Collateral Agent

TABLE OF CONTENTS

Page

ARTICLE I
Guarantee
SECTION 1.01.	Guarantee	1
SECTION 1.02.	Guarantee of Payment	1
SECTION 1.03.	No Limitations, Etc.	1
SECTION 1.04.	Reinstatement	2
SECTION 1.05.	Agreement To Pay; Subrogation	2
SECTION 1.06.	Information	2
ARTICLE II
Indemnity, Subrogation and Subordination
SECTION 2.01.	Indemnity and Subrogation	2
SECTION 2.02.	Contribution and Subrogation	2
SECTION 2.03.	Subordination	2
ARTICLE III
Miscellaneous
SECTION 3.01.	Notices	2
SECTION 3.02.	Survival of Agreement	3
SECTION 3.03.	Binding Effect; Several Agreement	3
SECTION 3.04.	Successors and Assigns	3
SECTION 3.05.	Collateral Agent’s Fees and Expenses; Indemnification	3
SECTION 3.06.	Applicable Law	3
SECTION 3.07.	Waivers; Amendment	3
SECTION 3.08.	WAIVER OF JURY TRIAL	4
SECTION 3.09.	Severability	4
SECTION 3.10.	Counterparts	4
SECTION 3.11.	Headings	4
SECTION 3.12.	Jurisdiction; Consent to Service of Process	4
SECTION 3.13.	Termination or Release	4
SECTION 3.14.	Additional Subsidiaries	5
SECTION 3.15.	Right of Setoff	5

Schedules

Schedule I                Subsidiary Guarantors

Exhibits

Exhibt A                    Form of Supplement

U.S. GUARANTY dated as of January 26, 2011 (this “Guaranty”), among PLY GEM INDUSTRIES, INC., a Delaware corporation (the “Specified U.S. Borrower”), PLY GEM HOLDINGS, INC., a Delaware corporation (“Holdings”), the Subsidiaries of the Specified U.S. Borrower listed on Schedule I hereto (the “Subsidiary Guarantors”) (the Specified U.S. Borrower, Holdings, and the Subsidiary Guarantors being, collectively, the “Guarantors” and, individually, each a “Guarantor”) and UBS AG, STAMFORD BRANCH, as collateral agent (in such capacity, the “Collateral Agent”).

PRELIMINARY STATEMENT

Reference is made to the Credit Agreement dated as of January 26, 2011 (as amended, supplemented or otherwise modified from time to time, the “Credit Agreement”), among the Specified U.S. Borrower, Holdings, Ply Gem Canada, Inc., the lenders from time to time party thereto (the “Lenders”), UBS AG, STAMFORD BRANCH, as administrative agent (in such capacity, the “Administrative Agent”), and the Collateral Agent.  Capitalized terms used in this Guaranty and not otherwise defined herein have the meanings set forth in the Credit Agreement.

The Lenders and the L/C Issuers have agreed to extend credit to the Borrowers pursuant to, and upon the terms and conditions specified in, the Credit Agreement.  The obligations of the Lenders and the L/C Issuers to extend credit to the Borrowers, the Hedge Banks to enter into Secured Hedge Agreements and the Cash Management Banks to enter into Secured Cash Management Agreements, are conditioned upon, among other things, the execution and delivery of this Guaranty by the Borrowers and each Guarantor.  Each Guarantor is an affiliate of each Borrower, will derive substantial benefits from the extension of credit to the Borrowers pursuant to the Credit Agreement and is willing to execute and deliver this Guaranty in order to induce the Lenders and the L/C Issuers to extend such credit and the Hedge Banks and the Cash Management Banks to enter into Secured Hedge Agreements and Secured Cash Management Agreements.  Accordingly, the parties hereto agree as follows:

ARTICLE I

Guarantee

SECTION 1.01. Guarantee.  Each Guarantor unconditionally guarantees, jointly with the other Guarantors and severally, as a primary obligor and not merely as a surety, the due and punctual payment and performance of the Obligations.  Each Guarantor further agrees that the Obligations may be extended or renewed, in whole or in part, without notice to or further assent from it, and that it will remain bound upon its guarantee notwithstanding any extension or renewal of any Obligation.  Each Guarantor waives presentment to, demand of payment from and protest to any Borrower or any other Loan Party of any Obligation, and also waives notice of acceptance of its guarantee and notice of protest for nonpayment.

SECTION 1.02. Guarantee of Payment.  Each Guarantor further agrees that its guarantee hereunder constitutes a guarantee of payment when due and not of collection, and waives any right to require that any resort be had by the Collateral Agent or any other Secured Party to any security held for the payment of the Obligations or to any balance of any Deposit Account or credit on the books of the Collateral Agent or any other Secured Party in favor of any Borrower or any other person.

SECTION 1.03. No Limitations, Etc.  (a) Except for termination of a Guarantor’s obligations hereunder as expressly provided in Section 3.13, the obligations of each Guarantor hereunder shall not be subject to any reduction, limitation, impairment or termination for any reason, including any claim of waiver, release, surrender, alteration or compromise, and shall not be subject to any defense or setoff, counterclaim, recoupment or termination whatsoever by reason of the invalidity, illegality or unenforceability of the Obligations or otherwise.  Without limiting the generality of the foregoing, the obligations of each Guarantor hereunder shall not be discharged or impaired or otherwise affected by (i) the failure of the Collateral Agent or any other Secured Party to assert any claim or demand or to enforce any right or remedy under the provisions of any Loan Document or otherwise, (ii) any rescission, waiver, amendment or modification of, or any release from any of the terms or provisions of, any Loan Document or any other agreement, including with respect to any other Guarantor under this Guaranty, (iii) the release of, or any impairment of or failure to perfect any Lien on or security interest in, any security held by the Collateral Agent or  any other Secured Party for the Obligations or any of them, (iv) any default, failure or delay, wilful or otherwise, in the performance of the Obligations, or (v) any other act or omission that may or might in any manner or to any extent vary the risk of any Guarantor or otherwise operate as a discharge of any Guarantor as a matter of law or equity (other than the indefeasible payment in full in cash of all the Obligations).  Each Guarantor expressly authorizes the Collateral Agent to take and hold security for the payment and performance of the Obligations, to exchange, waive or release any or all such security (with or without consideration), to enforce or apply such security and direct the order and manner of any sale thereof in its sole discretion or to release or substitute any one or more other guarantors or obligors upon or in respect of the Obligations, all without affecting the obligations of any Guarantor hereunder.

(b) To the fullest extent permitted by applicable law, each Guarantor waives any defense based on or arising out of any defense of any Borrower or any other Loan Party or the unenforceability of the Obligations or any part thereof from any cause, or the cessation from any cause of the liability of any Borrower or any other Loan Party, other than the indefeasible payment in full in cash of all the Obligations.  The Collateral Agent and the other Secured Parties may, at their election, foreclose on any security held by one or more of them by one or more judicial or nonjudicial sales, accept an assignment of any such security in lieu of foreclosure, compromise or adjust any part of the Obligations, make any other accommodation with any Borrower or any other Loan Party or exercise any other right or remedy available to them against any Borrower or any other Loan Party, without affecting or impairing in any way the liability of any Guarantor hereunder except to the extent the Obligations have been fully and indefeasibly paid in full in cash.  To the fullest extent permitted by applicable law, each Guarantor waives any defense arising out of any such election even though such election operates, pursuant to applicable law, to impair or to extinguish any right of reimbursement or subrogation or other right or remedy of such Guarantor against any Borrower or any other Loan Party, as the case may be, or any security.

SECTION 1.04. Reinstatement.  Each Guarantor agrees that its guarantee hereunder shall continue to be effective or be reinstated, as the case may be, if at any time payment, or any part thereof, of any Obligation is rescinded or must otherwise be restored by the Collateral Agent or any other Secured Party upon the bankruptcy or reorganization of any Borrower, any other Loan Party or otherwise.

SECTION 1.05. Agreement To Pay; Subrogation.  In furtherance of the foregoing and not in limitation of any other right that the Collateral Agent or any other Secured Party has at law or in equity against any Guarantor by virtue hereof, upon the failure of any Borrower or any other Loan Party to pay any Obligation when and as the same shall become due, whether at maturity, by acceleration, after notice of prepayment or otherwise, each Guarantor hereby promises to and will forthwith pay, or cause to be paid, to the Collateral Agent for distribution to the applicable Secured Parties in cash the amount of such unpaid Obligation.  Upon payment by any Guarantor of any sums to the Collateral Agent as provided above, all rights of such Guarantor against any Borrower or any other Guarantor arising as a result thereof by way of right of subrogation, contribution, reimbursement, indemnity or otherwise shall in all respects be subject to Article II.

SECTION 1.06. Information.  Each Guarantor assumes all responsibility for being and keeping itself informed of each Borrower’s and each other Loan Party’s financial condition and assets and of all other circumstances bearing upon the risk of nonpayment of the Obligations and the nature, scope and extent of the risks that such Guarantor assumes and incurs hereunder, and agrees that neither the Collateral Agent nor any other Secured Party will have any duty to advise such Guarantor of information known to it or any of them regarding such circumstances or risks.

ARTICLE II

Indemnity, Subrogation and Subordination

SECTION 2.01. Indemnity and Subrogation.  In addition to all such rights of indemnity and subrogation as the Guarantors may have under applicable law (but subject to Section 2.03), each Borrower agrees that (a) in the event a payment shall be made by any Guarantor under this Guaranty, the Borrowers shall indemnify such Guarantor for the full amount of such payment and such Guarantor shall be subrogated to the rights of the person to whom such payment shall have been made to the extent of such payment and (b) in the event any assets of any Guarantor shall be sold pursuant to this Guaranty or any other Collateral Document to satisfy in whole or in part a claim of any Secured Party, the Borrowers shall indemnify such Guarantor in an amount equal to the greater of the book value or the fair market value of the assets so sold.

SECTION 2.02. Contribution and Subrogation.  Each Guarantor (a “Contributing Guarantor”) agrees (subject to Section 2.03) that, in the event a payment shall be made by any other Guarantor hereunder in respect of any Obligation, or assets of any other Guarantor shall be sold pursuant to any Collateral Document to satisfy any Obligation owed to any Secured Party, and such other Guarantor (the “Claiming Guarantor”) shall not have been fully indemnified by the Borrowers as provided in Section 2.01, the Contributing Guarantor shall indemnify the Claiming Guarantor in an amount equal to (i) the amount of such payment or (ii) the greater of the book value or the fair market value of such assets, as the case may be, in each case multiplied by a fraction of which the numerator shall be the net worth of the Contributing Guarantor on the date hereof and the denominator shall be the aggregate net worth of all the Guarantors on the date hereof (or, in the case of any Guarantor becoming a party hereto pursuant to Section 3.14, the date of the supplement hereto executed and delivered by such Guarantor).  Any Contributing Guarantor making any payment to a Claiming Guarantor pursuant to this Section 2.02 shall be subrogated to the rights of such Claiming Guarantor under Section 2.01 to the extent of such payment.

SECTION 2.03. Subordination.  (a) Notwithstanding any provision of this Guaranty to the contrary, all rights of the Guarantors under Sections 2.01 and 2.02 and all other rights of indemnity, contribution or subrogation under applicable law or otherwise shall be fully subordinated to the indefeasible payment in full in cash of the Obligations.  No failure on the part of any Borrower or any Guarantor to make the payments required by Sections 2.01 and 2.02 (or any other payments required under applicable law or otherwise) shall in any respect limit the obligations and liabilities of any Guarantor with respect to its obligations hereunder, and each Guarantor shall remain liable for the full amount of its obligations hereunder.

(b) Each Borrower and each Guarantor hereby agree that all Indebtedness and other monetary obligations owed by it to any Borrower or any Subsidiary shall be fully subordinated to the indefeasible payment in full in cash of the Obligations.

ARTICLE III

Miscellaneous

SECTION 3.01. Notices.  All communications and notices hereunder shall (except as otherwise expressly permitted herein) be in writing and given as provided in Section 10.02 of the Credit Agreement.  All communications and notices hereunder to any Subsidiary Guarantor shall be given to it in care of Specified U.S. Borrower as provided in Section 10.02 of the Credit Agreement.

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SECTION 3.02. Survival of Agreement.  All covenants, agreements, representations and warranties made by the Loan Parties in the Loan Documents and in the certificates or other instruments prepared or delivered in connection with or pursuant to this Guaranty or any other Loan Document shall be considered to have been relied upon by the Lenders and the L/C Issuers and shall survive the execution and delivery of the Loan Documents and the making of any Loans and issuance of any Letters of Credit, regardless of any investigation made by any Lender or L/C Issuer or on their behalf and notwithstanding that the Collateral Agent, any L/C Issuer or any Lender may have had notice or knowledge of any Default or incorrect representation or warranty at the time any credit is extended under the Credit Agreement, and shall continue in full force and effect as long as the principal of or any accrued interest on any Loan or any fee or any other amount payable under any Loan Document is outstanding and unpaid or the aggregate outstanding L/C Obligations do not equal zero and so long as the Commitments have not expired or terminated.

SECTION 3.03. Binding Effect; Several Agreement.  This Guaranty shall become effective as to any Loan Party when a counterpart hereof executed on behalf of such Loan Party shall have been delivered to the Collateral Agent and a counterpart hereof shall have been executed on behalf of the Collateral Agent, and thereafter shall be binding upon such Loan Party and the Collateral Agent and their respective permitted successors and assigns, and shall inure to the benefit of such Loan Party, the Collateral Agent and the other Secured Parties and their respective successors and assigns, except that no Loan Party shall have the right to assign or transfer its rights or obligations hereunder or any interest herein or in the Collateral (and any such assignment or transfer shall be void) except as expressly contemplated or permitted by this Guaranty or the Credit Agreement.  This Guaranty shall be construed as a separate agreement with respect to each Loan Party and may be amended, modified, supplemented, waived or released with respect to any Loan Party without the approval of any other Loan Party and without affecting the obligations of any other Loan Party hereunder.

SECTION 3.04. Successors and Assigns.  Whenever in this Guaranty any of the parties hereto is referred to, such reference shall be deemed to include the permitted successors and assigns of such party; and all covenants, promises and agreements by or on behalf of any Guarantor or the Collateral Agent that are contained in this Guaranty shall bind and inure to the benefit of their respective successors and assigns.

SECTION 3.05. Collateral Agent’s Fees and Expenses; Indemnification.  (a) The parties hereto agree that the Collateral Agent shall be entitled to reimbursement of its expenses incurred hereunder as provided in Section 10.04 of the Credit Agreement.

(b) Without limitation of its indemnification obligations under the other Loan Documents, each Guarantor jointly and severally agrees to indemnify the Collateral Agent and the other indemnitees against, and hold each indemnitee harmless from, any and all losses, claims, damages, liabilities, and related out of pocket expenses, including the fees, charges and disbursements of any counsel for any indemnitee, incurred by or asserted against any indemnitee arising out of, in any way connected with, or as a result of, the execution, delivery or performance of this Guaranty or any agreement or instrument contemplated hereby or any claim, litigation, investigation or proceeding relating to any of the foregoing or to the Collateral, regardless of whether any indemnitee is a party thereto or whether initiated by a third party or by a Loan Party or any Affiliate thereof; provided, however, that such indemnity shall not, as to any indemnitee, be available to the extent that such losses, claims, damages, liabilities or related expenses are determined by a court of competent jurisdiction by final and nonappealable judgment to have resulted from the gross negligence or wilful misconduct of such indemnitee.  To the extent permitted by applicable law, no Guarantor shall assert, and each Guarantor hereby waives any claim against any indemnitee, on any theory of liability, for special, indirect, consequential or punitive damages (as opposed to direct or actual damages) arising out of, in connection with, or as a result of, this Guaranty or any agreement or instrument contemplated hereby, the Transactions, any Loan or Letter of Credit or the use of proceeds thereof.

(c) Any such amounts payable as provided hereunder shall be additional Obligations secured hereby and by the other Collateral Documents. The provisions of this Section 3.05 shall remain operative and in full force and effect regardless of the termination of this Guaranty or any other Loan Document, the consummation of the transactions contemplated hereby, the repayment of any of the Obligations, the invalidity or unenforceability of any term or provision of this Guaranty or any other Loan Document, or any investigation made by or on behalf of the Collateral Agent or any other Secured Party.  All amounts due under this Section 3.05 shall be payable on written demand therefor and shall bear interest, on and from the date of demand, at the rate specified in Section 2.08(a)(iii) of the Credit Agreement.

SECTION 3.06. Applicable Law.  THIS AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

SECTION 3.07. Waivers; Amendment.  (a) No failure or delay by the Collateral Agent, the Administrative Agent, any L/C Issuer or any Lender in exercising any right or power hereunder or under any other Loan Document shall operate as a waiver hereof or thereof, nor shall any single or partial exercise of any such right or power, or any abandonment or discontinuance of steps to enforce such a right or power, preclude any other or further exercise thereof or the exercise of any other right or power. The rights and remedies of the Collateral Agent, the Administrative Agent, the L/C Issuers and the Lenders hereunder and under the other Loan Documents are cumulative and are not exclusive of any rights or remedies that they would otherwise have. No waiver of any provision of any Loan Document or consent to any departure by any Loan Party therefrom shall in any event be effective unless the same shall be permitted by paragraph (b) of this Section 3.07, and then such waiver or consent shall be effective only in the specific instance and for the purpose for which given.  Without limiting the generality of the foregoing, the making of a Loan or issuance of a Letter of Credit shall not be construed as a waiver of any Default, regardless of whether the Collateral Agent, any Lender or any L/C Issuer may have had notice or knowledge of such Default at the time. No notice or demand on any Loan Party in any case shall entitle any Loan Party to any other or further notice or demand in similar or other circumstances.

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(b) Neither this Guaranty nor any provision hereof may be waived, amended or modified except pursuant to an agreement or agreements in writing entered into by the Collateral Agent and the Loan Party or Loan Parties with respect to which such waiver, amendment or modification is to apply, subject to any consent required in accordance with Section 10.01 of the Credit Agreement.

SECTION 3.08. WAIVER OF JURY TRIAL.  EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS AGREEMENT OR ANY OF THE OTHER LOAN DOCUMENTS. EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS, AS APPLICABLE, BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 3.08.

SECTION 3.09. Severability.  In the event any one or more of the provisions contained in this Guaranty or in any other Loan Document should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein and therein shall not in any way be affected or impaired thereby (it being understood that the invalidity of a particular provision in a particular jurisdiction shall not in and of itself affect the validity of such provision in any other jurisdiction). The parties shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions.

SECTION 3.10. Counterparts.  This Guaranty may be executed in counterparts (and by different parties hereto on different counterparts), each of which shall constitute an original but all of which when taken together shall constitute a single contract, and shall become effective as provided in Section 3.03.  Delivery of an executed signature page to this Guaranty by facsimile transmission shall be as effective as delivery of a manually signed counterpart of this Guaranty.

SECTION 3.11. Headings.  Article and Section headings and the Table of Contents used herein are for convenience of reference only, are not part of this Guaranty and are not to affect the construction of, or to be taken into consideration in interpreting, this Guaranty.

SECTION 3.12. Jurisdiction; Consent to Service of Process.  (a) Each of the Guarantors hereby irrevocably and unconditionally submits, for itself and its property, to the exclusive jurisdiction of any New York State court or Federal court of the United States of America, sitting in New York City, and any appellate court from any thereof, in any action or proceeding arising out of or relating to this Guaranty or any other Loan Document, or for recognition or enforcement of any judgment, and each of the Loan Parties hereby irrevocably and unconditionally agrees that all claims in respect of any such action or proceeding may be heard and determined in such New York State or, to the extent permitted by law, in such Federal court.  Each of the Loan Parties agrees that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by law. Nothing in this Guaranty or any other Loan Document shall affect any right that the Collateral Agent, the Administrative Agent, any L/C Issuer or any Lender may otherwise have to bring any action or proceeding relating to this Guaranty or any other Loan Document against any Guarantor or its properties in the courts of any jurisdiction.

(b) Each of the Loan Parties hereby irrevocably and unconditionally waives, to the fullest extent it may legally and effectively do so, any objection which it may now or hereafter have to the laying of venue of any suit, action or proceeding arising out of or relating to this Guaranty or any other Loan Document in any court referred to in paragraph (a) of this Section 3.12.  Each of the Loan Parties hereby irrevocably waives, to the fullest extent permitted by law, the defense of an inconvenient forum to the maintenance of such action or proceeding in any such court.

(c) Each of the Loan Parties hereby irrevocably consents to service of process in the manner provided for notices in Section 3.01.  Nothing in this Guaranty or any other Loan Document will affect the right of the Collateral Agent to serve process in any other manner permitted by law.

SECTION 3.13. Termination or Release.  (a) This Guaranty and the guarantees made herein shall terminate upon (i) the termination of the Aggregate Commitments and payment in full of all Obligations (other than (A) contingent indemnification obligations and (B) obligations and liabilities under Secured Cash Management Agreements and Secured Hedge Agreements as to which arrangements satisfactory to the applicable Cash Management Bank or Hedge Bank shall have been made) and (ii) the expiration or termination of all Letters of Credit (other than Letters of Credit as to which other arrangements satisfactory to the Collateral Agent and the applicable L/C Issuer shall have been made).

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(b) A Guarantor that is a Subsidiary shall automatically be released from its obligations hereunder upon the consummation of any transaction permitted by the Credit Agreement as a result of which such Guarantor ceases to be a Subsidiary.

(c) In connection with any termination or release pursuant to paragraph (a) or (b) above, the Collateral Agent shall promptly execute and deliver to any Guarantor, at such Guarantor’s expense, all such documents that such Guarantor shall reasonably request to evidence such termination or release.  Any execution and delivery of documents pursuant to this Section 3.13 shall be without recourse to or representation or warranty by the Collateral Agent or any Secured Party.  Without limiting the provisions of Section 3.05, the Borrowers shall reimburse the Collateral Agent upon demand for all costs and out of pocket expenses, including the fees, charges and expenses of counsel, incurred by it in connection with any action contemplated by this Section 3.13.

SECTION 3.14. Additional Subsidiaries.  Any Subsidiary that is required to become a party hereto pursuant to Section 6.12 of the Credit Agreement shall enter into this Guaranty as a Guarantor upon becoming such a Subsidiary.  Upon execution and delivery by the Collateral Agent and such Subsidiary of a supplement in the form of Exhibit A hereto, such Subsidiary shall become a Guarantor  hereunder with the same force and effect as if originally named as a Guarantor herein.  The execution and delivery of any such instrument shall not require the consent of any other Loan Party hereunder. The rights and obligations of each Loan Party hereunder shall remain in full force and effect notwithstanding the addition of any new Loan Party as a party to this Guaranty.

SECTION 3.15. Right of Setoff.  If an Event of Default shall have occurred and is continuing, each Secured Party is hereby authorized at any time and from time to time, to the fullest extent permitted by law, to set off and apply any and all Collateral (including any deposits (general or special, time or demand, provisional or final)) at any time held and other obligations at any time owing by such Secured Party to or for the credit or the account of any Guarantor against any and all of the obligations of such Guarantor now or hereafter existing under this Guaranty and the other Loan Documents held by such Secured Party, irrespective of whether or not such Secured Party shall have made any demand under this Guaranty or any other Loan Document and although such obligations may be unmatured.  The rights of each Secured Party under this Section 3.15 are in addition to other rights and remedies (including other rights of setoff) which such Secured Party may have.

[Remainder of page intentionally left blank]

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IN WITNESS WHEREOF, the parties hereto have caused this U.S. Guaranty to be duly executed by their respective authorized officers as of the day and year first above written.

PLY GEM INDUSTRIES, INC.

by

/s/ Xxxxx X. Poe___________________

Name:  Xxxxx X. Xxx

Title:    Vice President

PLY GEM HOLDINGS, INC.,

by

/s/ Xxxxx X. Poe_________________

Name:  Xxxxx X. Xxx

Title:    Vice President

EACH OF THE SUBSIDIARIES LISTED ON SCHEDULE I HERETO,

by

/s/ Xxxxx X. Poe_________________

Name:  Xxxxx X. Xxx

Title:    Secretary

NEW ALENCO EXTRUSION, LTD.

By:  Alenco Extrusion Management, L.L.C., its General Partner,

by

/s/ Xxxxx X. Poe________________

Name:  Xxxxx X. Xxx

Title:    Secretary

NEW ALENCO WINDOW, LTD.

By:  Alenco Building Products Management, L.L.C., its General Partner,

by

/s/ Xxxxx X. Poe_______________

Name:  Xxxxx X. Xxx

Title:    Secretary

NEW GLAZING INDUSTRIES, LTD.

By:  Glazing Industries Management, L.L.C., its General Partner,

by

/s/ Xxxxx X. Poe________________

Name:  Xxxxx X. Xxx

Title:    Secretary

[Signature Page – Ply Gem U.S. Guaranty Agreement]

UBS AG, STAMFORD BRANCH, as Collateral Agent

by

/s/ Xxxx X. Evans_____________

Name:  Xxxx X. Xxxxx

Title:    Associate Director, Banking Produts Services, U.S.

by 

                /s/ Xxxx X. Otsa________________

                Name:  Xxxx X. Xxxx

                Title:    Associate Director, Banking Products Services, U.S.

[Signature Page – Ply Gem U.S. Guaranty Agreement]

Schedule I to the

U.S. Guaranty

Schedule I to U.S. Guaranty

Subsidiary Guarantors

Alenco Building Products Management, L.L.C.

Alenco Extrusion GA, L.L.C.

Alenco Extrusion Management, L.L.C.

Alenco Holding Corporation

Alenco Interests, L.L.C.

Alenco Trans, Inc.

Alenco Window GA, L.L.C.

Aluminum Scrap Recycle, L.L.C.

AWC Arizona, Inc.

AWC Holding Company

Glazing Industries Management, L.L.C.

Great Lakes Window, Inc.

Kroy Building Products, Inc.

Mastic Home Exteriors, Inc.

MW Manufacturers Inc.

MWM Holding, Inc.

Napco, Inc.

New Alenco Extrusion, Ltd.

New Alenco Window, Ltd.

New Glazing Industries, Ltd.

Ply Gem Pacific Windows Corporation

Variform, Inc.

Exhibit A to the

U.S. Guaranty

SUPPLEMENT NO. [●] (this “Supplement”) dated as of [●], 200[●] to the U.S. Guaranty dated as of January 26, 2011 (the “U.S. Guaranty”), among PLY GEM INDUSTRIES, INC., a Delaware corporation (the “Specified U.S. Borrower”), PLY GEM HOLDINGS, INC., a Delaware company (“Holdings”), each Subsidiary of the Borrower from time to time party thereto (each such Subsidiary individually a “Subsidiary Guarantor” and collectively, the “Subsidiary Guarantors”; the Subsidiary Guarantors, the Specified U.S. Borrower and Holdings are referred to collectively herein as the “Guarantors”) and UBS AG, STAMFORD BRANCH, as collateral agent (in such capacity, the “Collateral Agent”).

A.  Reference is made to the Credit Agreement dated as of January 26, 2011 (as amended, supplemented or otherwise modified from time to time, the “Credit Agreement”), among the Specified U.S. Borrower, Holdings, Ply Gem Canada, Inc., the lenders from time to time party thereto (the “Lenders”), UBS AG, STAMFORD BRANCH, as administrative agent (in such capacity, the “Administrative Agent”), and the Collateral Agent.

B.  Capitalized terms used herein and not otherwise defined herein shall have the meanings assigned to such terms in the Credit Agreement or the U.S. Guaranty, as applicable.

C.  The Guarantors have entered into the U.S. Guaranty in order to induce the Lenders to make Loans, the L/C Issuers to issue Letters of Credit and the Hedge Banks and the Cash Management Banks to enter into Secured Hedge Agreements and Secured Cash Management Agreements.  Section 3.14 of the U.S. Guaranty provides that additional Subsidiaries of the Specified U.S. Borrower may become Guarantors under the U.S. Guaranty by execution and delivery of an instrument in the form of this Supplement.  The undersigned Subsidiary (the “New Subsidiary”) is executing this Supplement in accordance with the requirements of the Credit Agreement to become a Guarantor under the U.S. Guaranty in order to induce the Lenders to make additional Loans and the L/C Issuers to issue additional Letters of Credit and as consideration for Loans previously made and Letters of Credit previously issued.

Accordingly, the Collateral Agent and the New Subsidiary agree as follows:

SECTION 1.  In accordance with Section 3.14 of the U.S. Guaranty, the New Subsidiary by its signature below becomes a Guarantor under the U.S. Guaranty with the same force and effect as if originally named therein as a Guarantor and the New Subsidiary hereby (a) agrees to all the terms and provisions of the U.S. Guaranty applicable to it as a Guarantor thereunder and (b) represents and warrants that the representations and warranties made by it as a Guarantor thereunder are true and correct on and as of the date hereof.  In furtherance of the foregoing, the New Subsidiary unconditionally guarantees the due and punctual payment and performance of the Obligations.  Each reference to a “Guarantor” in the U.S. Guaranty shall be deemed to include the New Subsidiary.  The U.S. Guaranty is hereby incorporated herein by reference.

SECTION 2.  The New Subsidiary represents and warrants to the Collateral Agent and the other Secured Parties that this Supplement has been duly authorized, executed and delivered by it and constitutes its legal, valid and binding obligation, enforceable against it in accordance with its terms.

SECTION 3.  This Supplement may be executed in counterparts (and by different parties hereto on different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract. This Supplement shall become effective when the Collateral Agent shall have received counterparts of this Supplement that, when taken together, bear the signatures of the New Subsidiary and the Collateral Agent.  Delivery of an executed signature page to this Supplement by facsimile transmission shall be as effective as delivery of a manually signed counterpart of this Supplement.

SECTION 4.  The New Subsidiary hereby represents and warrants that set forth under its signature hereto, is the true and correct legal name of the New Subsidiary and its jurisdiction of organization.

SECTION 5.  Except as expressly supplemented hereby, the U.S. Guaranty shall remain in full force and effect.

SECTION 6.  THIS SUPPLEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

SECTION 7.  In case any one or more of the provisions contained in this Supplement should be held invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein and in the U.S. Guaranty shall not in any way be affected or impaired thereby (it being understood that the invalidity of a particular provision in a particular jurisdiction shall not in and of itself affect the validity of such provision in any other jurisdiction). The parties hereto shall endeavor in good-faith negotiations to replace the invalid, illegal or unenforceable provisions with valid provisions the economic effect of which comes as close as possible to that of the invalid, illegal or unenforceable provisions.

SECTION 8.  All communications and notices hereunder shall (except as otherwise expressly permitted by the U.S. Guaranty) be in writing and given as provided in Section 10.02 of the Credit Agreement.  All communications and notices hereunder to the New Subsidiary shall be given to it in care of the Specified U.S. Borrower as provided in Section 10.02 of the Credit Agreement.

SECTION 9.  The New Subsidiary agrees to reimburse the Collateral Agent for its out-of-pocket expenses in connection with this Supplement, including the fees, other charges and disbursements of counsel for the Collateral Agent.

IN WITNESS WHEREOF, the New Subsidiary and the Collateral Agent have duly executed this Supplement to the U.S. Guaranty as of the day and year first above written.

[NAME OF NEW SUBSIDIARY],

by

___________________________

Name:

Title:

Address:

Legal Name:

Jurisdiction of Formation:

UBS AG, STAMFORD BRANCH, as Collateral Agent

by

___________________________

Name:

Title:

[Signature Page – Ply Gem Supplement to U.S. Guaranty Agreement]