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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001179110-05-013521.txt : 20050701
<SEC-HEADER>0001179110-05-013521.hdr.sgml : 20050701
<ACCEPTANCE-DATETIME>20050701161141
ACCESSION NUMBER:		0001179110-05-013521
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050630
FILED AS OF DATE:		20050701
DATE AS OF CHANGE:		20050701

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BEACON ROOFING SUPPLY INC
		CENTRAL INDEX KEY:			0001124941
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-LUMBER & OTHER CONSTRUCTION MATERIALS [5030]
		IRS NUMBER:				000000000

	BUSINESS ADDRESS:	
		STREET 1:		50 WEBSTER AVE
		CITY:			SOMERVILLE
		STATE:			MA
		ZIP:			02143

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Logie Andrew R
		CENTRAL INDEX KEY:			0001302285

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50924
		FILM NUMBER:		05933518

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		877-645-7663

	MAIL ADDRESS:	
		STREET 1:		BEACON ROOFING SUPPLY, INC.
		STREET 2:		1 LAKELAND PARK DRIVE
		CITY:			PEABODY
		STATE:			MA
		ZIP:			01960
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-06-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001124941</issuerCik>
        <issuerName>BEACON ROOFING SUPPLY INC</issuerName>
        <issuerTradingSymbol>BECN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001302285</rptOwnerCik>
            <rptOwnerName>Logie Andrew R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE LAKELAND PARK DR.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PEABODY</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01960</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman of the Board</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2005-06-30</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>77730</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>27.0636</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1215102</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Includes 47,053 shares that were held by the Logie Beacon Limited Partnership over which Mr. Logie shares voting and investment control. Mr. Logie disclaims beneficial ownership of shares held by the Logie Beacon Limited Partnership in which he does not have a pecuniary interest.</footnote>
        <footnote id="F2">Includes 735,538 shares that are held by the Logie Beacon Limited Partnership over which Mr. Logie shares voting and investment control. Mr. Logie disclaims beneficial ownership of shares held by the Logie Beacon Limited Partnership in which he does not have a pecuniary interest.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Andrew R. Logie</signatureName>
        <signatureDate>2005-07-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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