Amendedand Restated 1999 Stock Option and Incentive Plan Non-Incentive Stock Option Agreement

Exhibit 10.5

Officers and Employee Directors

TREX COMPANY, INC.

Amended and Restated

1999 Stock Option and Incentive Plan

Non-Incentive Stock Option Agreement

Number of Shares of Common Stock

Covered by Grant of Options:

We are pleased to inform you that the Board of Directors has granted you an option (the “Option”) to purchase Trex Company, Inc. common stock. Your grant has been made under the Company’s Amended and Restated 1999 Stock Option and Incentive Plan (the “Plan”), which, together with the terms contained in this Agreement, sets forth the terms and conditions of your grant and is incorporated herein by reference. If any provisions of the Agreement should appear to be inconsistent with the Plan, the Plan will control.

This is not a stock certificate or a negotiable instrument. Transferable only pursuant to Section 11.2 of the Plan.

1. Vesting:

Subject to the terms of the Plan, the Option becomes vested as to 25% of the shares of Stock purchasable pursuant to the Option on the first anniversary of the date of grant of the Option, if you have been providing services to the Company or a Subsidiary continuously from the Option’s date of grant to the first anniversary of the date of grant (the “Anniversary Date”) and, so long as continuous provision of services has not been interrupted, the Option becomes vested as to an additional 25% of the shares of Stock subject to the Option on each of the next three (3) Anniversary Dates. Notwithstanding the foregoing, if you should incur an Involuntary Termination within a one year period following a Change in Control, the Option shall become 100% vested at the time of your termination. “Change in Control” means the dissolution or liquidation of the Company or a merger, consolidation, or reorganization of the Company with one or more other entities in which the Company is not the surviving entity, (ii) a sale of substantially all of the assets of the Company to another person or entity, or (iii) any transaction (including without limitation a merger or reorganization in which the Company is the surviving entity) which results in any person or entity (other than persons who are shareholders or Affiliates immediately prior to the transaction) owning 50% or more of the combined voting power of all classes of stock of the Company. “Involuntary Termination” means a termination of employment by the Company for a reason other than Cause or by you if the Company takes any action which results in a diminution in any material respect with your position (including status, offices, titles and reporting requirements), compensation authority, duties or responsibilities, excluding for this purpose an isolated, insubstantial and inadvertent action not taken in bad faith and which is remedied by the Company promptly after receipt of notice thereof given by you.

2. Exercise:

You may exercise this Option, in whole or in part, to purchase a whole number of vested shares at any time of not less than 100 shares, unless the number of shares purchased is the total number available for purchase under the Option, by following the exercise procedures as set forth in the Plan. All exercises must take place before the Last Date to Exercise (shown on the cover sheet), or such earlier date following your death, disability, retirement, or your ceasing to provide services as described below under “Service Requirements.” The number of shares you may purchase as of any date cannot exceed the total number of shares vested by that date, less any shares you have previously acquired by exercising this Option.

3. Service Requirements and Termination of Option:

If your service terminates, except as provided in Section 1 above and this Section 3, all further vesting of shares under this Option stops and all unvested shares are canceled.

If your service terminates for a reason other than: (i) for Cause or (ii) because of your death, permanent and total disability or retirement, you will have ninety (90) days after your provision of services ceases to exercise your vested Option shares, but in no event may the Option be exercised after the Last Date to Exercise. After the 90 days have elapsed, your Option will terminate.

If your service terminates because of your death, permanent and total disability, or retirement, you or your estate will have a period of five years to exercise any Options, whether or not the Options were otherwise exercisable at the time of your death, permanent and total disability, or retirement, but in no event may the Options be exercised after the Last Date to Exercise. After the five year period has elapsed, your Options will terminate.

Your Option will terminate immediately upon termination of your services for Cause. “Cause” means, as determined by the Board, (i) gross negligence or willful misconduct in connection with the performance of duties; (ii) conviction of a felony or of a crime involving moral turpitude; or (iii) material breach of any term of any employment, consulting or other services, confidentiality, intellectual property or non-competition agreements.

4. Taxes and Withholding:

This Option shall not constitute an incentive stock option within the meaning of Section 422 of the Internal Revenue Code of 1986, as amended. In the event that the Company determines that any federal, state, local or foreign tax or withholding payment is required relating to the exercise or sale of shares arising from this grant, the Company shall have the right to require such payments from you, or withhold such amounts from other payments due to you from the Company, a Subsidiary or an Affiliate.

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5. Transferability:

The Option may be transferred in a manner consistent with Section 11.2 of the Plan.

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