| | | | | | | | | | | | | | | | | | | | | | |
| <?xml version="1.0" encoding="windows-1252"?> |
| <ownershipDocument> |
| <schemaVersion> X0306 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2020-02-24 </periodOfReport> |
| <issuer> |
| | <issuerCik> 0001644440 </issuerCik> |
| | <issuerName> GCP Applied Technologies Inc. </issuerName> |
| | <issuerTradingSymbol> GCP </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001788214 </rptOwnerCik> |
| | | <rptOwnerName> van Lent Boudewijn </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> C/O GCP APPLIED TECHNOLOGIES INC. </rptOwnerStreet1> |
| | | <rptOwnerStreet2> 62 WHITTEMORE AVE </rptOwnerStreet2> |
| | | <rptOwnerCity> CAMBRIDGE </rptOwnerCity> |
| | | <rptOwnerState> MA </rptOwnerState> |
| | | <rptOwnerZipCode> 02140 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isDirector> 0 </isDirector> |
| | | <isOfficer> 1 </isOfficer> |
| | | <isTenPercentOwner> 0 </isTenPercentOwner> |
| | | <isOther> 0 </isOther> |
| | | <officerTitle> EVP, SCC </officerTitle> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2020-02-24 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> A </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| </transactionCoding> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 11831 </value> |
| <footnoteId id="F1"/> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 0 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> A </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 18197 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| <natureOfOwnership> |
| <value></value> |
| </natureOfOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | </nonDerivativeTable> |
| <footnotes> |
| | <footnote id="F1"> Restricted Stock Unit ("RSU") award. Each RSU represents the right to receive one share of GCP common stock. RSU's vest in substantially equal installments on each of the first, second, and third anniversary of the grant date and are settled in shares of GCP common stock upon vesting. </footnote> |
| | </footnotes> |
| <remarks></remarks> |
| <ownerSignature> |
| | <signatureName> /s/ James E. Thompson, Attorney-in-Fact </signatureName> |
| | <signatureDate> 2020-02-25 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |
