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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":40663,"source":{"system":"sec-edgar","filing":"0001127602-19-025621","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1069878/000112760219025621/form4.xml","form_type":"4"}},{"id":3451159,"issuer":{"id":3990,"kind":"organization","name":"TREX CO INC","symbol":"TREX"},"owners":[{"id":27845,"kind":"person","name":"ROBINSON PATRICIA B","position":1,"cik":"0001185204","reported_name":"ROBINSON PATRICIA B","relationship":{"director":true}}],"security":"Common Stock","published_at":"2019-08-01T18:08:31.000Z","date":"2019-07-31","kind":"disposition_to_issuer","acquired":false,"shares":637,"price":81.75,"value":52074.75,"ownership":{"direct":true},"balance_after":43530,"source":{"system":"sec-edgar","filing":"0001127602-19-025621","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1069878/000112760219025621/form4.xml","form_type":"4"}},{"id":3451158,"issuer":{"id":3990,"kind":"organization","name":"TREX CO INC","symbol":"TREX"},"owners":[{"id":27845,"kind":"person","name":"ROBINSON PATRICIA B","position":1,"cik":"0001185204","reported_name":"ROBINSON PATRICIA B","relationship":{"director":true}}],"security":"Common Stock","published_at":"2019-08-01T18:08:31.000Z","date":"2019-07-31","kind":"exercise","acquired":true,"shares":9828,"price":5.2975,"value":52063.83,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Stock Appreciation Rights (SARs) are being exercised pursuant to a Rule 10b5-1 Exercise Plan adopted by the reporting person on July 20, 2010."}],"balance_after":44167,"source":{"system":"sec-edgar","filing":"0001127602-19-025621","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1069878/000112760219025621/form4.xml","form_type":"4"}},{"id":3455377,"issuer":{"id":3990,"kind":"organization","name":"TREX CO INC","symbol":"TREX"},"owners":[{"id":27845,"kind":"person","name":"ROBINSON PATRICIA B","position":1,"cik":"0001185204","reported_name":"ROBINSON PATRICIA B","relationship":{"director":true}}],"security":"Common Stock","published_at":"2019-07-27T01:00:59.000Z","date":"2019-07-24","kind":"grant","acquired":true,"shares":1403,"price":71.28,"value":100005.84,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This restricted award will vest on the first anniversary of the grant."}],"balance_after":25347,"source":{"system":"sec-edgar","filing":"0001127602-19-025291","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1069878/000112760219025291/form4.xml","form_type":"4"}},{"id":3861036,"issuer":{"id":3990,"kind":"organization","name":"TREX CO INC","symbol":"TREX"},"owners":[{"id":27845,"kind":"person","name":"ROBINSON PATRICIA B","position":1,"cik":"0001185204","reported_name":"ROBINSON PATRICIA B","relationship":{"director":true}}],"security":"Common Stock","published_at":"2018-07-26T19:54:40.000Z","date":"2018-07-25","kind":"grant","acquired":true,"shares":1070,"price":65.37,"value":69945.9,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This restricted award will vest on the first anniversary of the grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On June 18, 2018, the Company effectuated a two-for-one stock split to common shareholders of record on May 23,2018.  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