diff --git a/src/Backends/ExcessHEFunction.cpp b/src/Backends/Helmholtz/ExcessHEFunction.cpp
similarity index 100%
rename from src/Backends/ExcessHEFunction.cpp
rename to src/Backends/Helmholtz/ExcessHEFunction.cpp
diff --git a/src/Backends/ExcessHEFunction.h b/src/Backends/Helmholtz/ExcessHEFunction.h
similarity index 100%
rename from src/Backends/ExcessHEFunction.h
rename to src/Backends/Helmholtz/ExcessHEFunction.h
diff --git a/src/Backends/FlashRoutines.cpp b/src/Backends/Helmholtz/FlashRoutines.cpp
similarity index 100%
rename from src/Backends/FlashRoutines.cpp
rename to src/Backends/Helmholtz/FlashRoutines.cpp
diff --git a/src/Backends/FlashRoutines.h b/src/Backends/Helmholtz/FlashRoutines.h
similarity index 100%
rename from src/Backends/FlashRoutines.h
rename to src/Backends/Helmholtz/FlashRoutines.h
diff --git a/src/Backends/HelmholtzEOSBackend.cpp b/src/Backends/Helmholtz/HelmholtzEOSBackend.cpp
similarity index 100%
rename from src/Backends/HelmholtzEOSBackend.cpp
rename to src/Backends/Helmholtz/HelmholtzEOSBackend.cpp
diff --git a/src/Backends/HelmholtzEOSBackend.h b/src/Backends/Helmholtz/HelmholtzEOSBackend.h
similarity index 100%
rename from src/Backends/HelmholtzEOSBackend.h
rename to src/Backends/Helmholtz/HelmholtzEOSBackend.h
diff --git a/src/Backends/HelmholtzEOSMixtureBackend.cpp b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
similarity index 100%
rename from src/Backends/HelmholtzEOSMixtureBackend.cpp
rename to src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
diff --git a/src/Backends/HelmholtzEOSMixtureBackend.h b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.h
similarity index 100%
rename from src/Backends/HelmholtzEOSMixtureBackend.h
rename to src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.h
diff --git a/src/Backends/ReducingFunctions.cpp b/src/Backends/Helmholtz/ReducingFunctions.cpp
similarity index 100%
rename from src/Backends/ReducingFunctions.cpp
rename to src/Backends/Helmholtz/ReducingFunctions.cpp
diff --git a/src/Backends/ReducingFunctions.h b/src/Backends/Helmholtz/ReducingFunctions.h
similarity index 100%
rename from src/Backends/ReducingFunctions.h
rename to src/Backends/Helmholtz/ReducingFunctions.h
diff --git a/src/Backends/VLERoutines.cpp b/src/Backends/Helmholtz/VLERoutines.cpp
similarity index 100%
rename from src/Backends/VLERoutines.cpp
rename to src/Backends/Helmholtz/VLERoutines.cpp
diff --git a/src/Backends/VLERoutines.h b/src/Backends/Helmholtz/VLERoutines.h
similarity index 100%
rename from src/Backends/VLERoutines.h
rename to src/Backends/Helmholtz/VLERoutines.h
diff --git a/src/Backends/IncompressibleBackend.h b/src/Backends/Incompressible/IncompressibleBackend.h
similarity index 100%
rename from src/Backends/IncompressibleBackend.h
rename to src/Backends/Incompressible/IncompressibleBackend.h
diff --git a/src/Backends/REFPROPBackend.cpp b/src/Backends/REFPROP/REFPROPBackend.cpp
similarity index 100%
rename from src/Backends/REFPROPBackend.cpp
rename to src/Backends/REFPROP/REFPROPBackend.cpp
diff --git a/src/Backends/REFPROPBackend.h b/src/Backends/REFPROP/REFPROPBackend.h
similarity index 100%
rename from src/Backends/REFPROPBackend.h
rename to src/Backends/REFPROP/REFPROPBackend.h
diff --git a/src/Backends/REFPROPMixtureBackend.cpp b/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
similarity index 100%
rename from src/Backends/REFPROPMixtureBackend.cpp
rename to src/Backends/REFPROP/REFPROPMixtureBackend.cpp
diff --git a/src/Backends/REFPROPMixtureBackend.h b/src/Backends/REFPROP/REFPROPMixtureBackend.h
similarity index 100%
rename from src/Backends/REFPROPMixtureBackend.h
rename to src/Backends/REFPROP/REFPROPMixtureBackend.h
diff --git a/src/Backends/REFPROP_lib.h b/src/Backends/REFPROP/REFPROP_lib.h
similarity index 100%
rename from src/Backends/REFPROP_lib.h
rename to src/Backends/REFPROP/REFPROP_lib.h