diff --git a/compact/definitions.xml b/compact/definitions.xml
index a684281bc4..c2b006e3e2 100644
--- a/compact/definitions.xml
+++ b/compact/definitions.xml
@@ -155,12 +155,15 @@ The unused IDs below are saved for future use.
     - DIRC subsystem       ID: 90
     - Barrel TRD subsystem ID: 91
     - Barrel TOF subsystem ID: 92
-    - Unused IDs: 93-99
+    - Barrel TOF subassembly ID: 93
+    - Barrel DIRC subassembly ID: 94
+    - Unused IDs: 95-99
     </documentation>
     <constant name="BarrelDIRC_ID" value="90"/>
     <constant name="BarrelTRD_ID"  value="91"/>
     <constant name="BarrelTOF_ID"  value="92"/>
     <constant name="TOFSubAssembly_ID" value="93"/>
+    <constant name="DIRCSubAssembly_ID" value="94"/>
 
     <documentation>
       #### (100-109) Electromagnetic Calorimeter
diff --git a/compact/pid/dirc.xml b/compact/pid/dirc.xml
index 05dcbf88d2..3cb6be10d0 100644
--- a/compact/pid/dirc.xml
+++ b/compact/pid/dirc.xml
@@ -91,9 +91,25 @@
   </display>
 
   <detectors>
+    <detector id="DIRCSubAssembly_ID"
+      name="DIRCTrackerSubAssembly"
+      type="DD4hep_SubdetectorAssembly"
+      vis="TrackerSubAssemblyVis">
+      <composite name="cb_DIRC"/>
+    </detector>
+
     <detector id="BarrelDIRC_ID" name="cb_DIRC" type="epic_DIRC" readout="DIRCBarHits" vis="DIRCTube">
+      <type_flags type="DetType_TRACKER + DetType_CHERENKOV + DetType_BARREL"/>
       <dimensions rmin="DIRCBar_center - DIRCBar_height/2" rmax="DIRCBar_center + DIRCBar_height/2" length="DIRC_length"/>
       <position x="0" y="0" z="DIRC_offset"/>
+
+      <envelope vis="BarrelDIRC_envelope"
+        rmin="DIRC_rmin"
+        rmax="DIRC_rmax"
+        length="DIRC_length"
+        zstart="-DIRCBackward_zmax"
+      />
+
       <module name="DIRCBox" repeat="DIRCBox_count" width="DIRCPrism_width + 1*mm" height="DIRCPrism_height*2" length="DIRCBarAssm_length + 550*mm" vis="DIRCBox">
         <!-- Mirror (at the end of the module) -->
         <mirror
@@ -173,6 +189,10 @@
   </readouts>
 
   <plugins>
+    <plugin name="DD4hep_ParametersPlugin">
+      <argument value="cb_DIRC"/>
+      <argument value="layer_pattern: str=envelope"/>
+    </plugin>
   </plugins>
 
   <fields>
diff --git a/src/DIRC_geo.cpp b/src/DIRC_geo.cpp
index c88c1fb343..562895b56d 100644
--- a/src/DIRC_geo.cpp
+++ b/src/DIRC_geo.cpp
@@ -1,12 +1,14 @@
 // SPDX-License-Identifier: LGPL-3.0-or-later
 // Copyright (C) 2022 Wouter Deconinck, Dmitry Romanov
 
+#include "DD4hepDetectorHelper.h"
 #include "DD4hep/DetFactoryHelper.h"
 #include "DD4hep/OpticalSurfaces.h"
 #include "DD4hep/Printout.h"
 #include "DDRec/DetectorData.h"
 #include "DDRec/Surface.h"
 #include <XML/Helper.h>
+#include <XML/Utilities.h>
 
 //////////////////////////////////
 // Central Barrel DIRC
@@ -36,6 +38,9 @@ static Ref_t createDetector(Detector& desc, xml_h e, SensitiveDetector sens) {
   // Detector type
   sens.setType("tracker");
 
+  // Set detector type flagAdd commentMore actions
+  dd4hep::xml::setDetectorTypeFlag(xml_det, det);
+
   // Entire DIRC assembly
   Assembly det_volume("DIRC");
   det_volume.setVisAttributes(desc.visAttributes(xml_det.visStr()));
@@ -43,6 +48,31 @@ static Ref_t createDetector(Detector& desc, xml_h e, SensitiveDetector sens) {
   det.setPlacement(
       desc.pickMotherVolume(det).placeVolume(det_volume, det_tr).addPhysVolID("system", det_id));
 
+  // ACTS support
+  auto& envelope_params =
+      DD4hepDetectorHelper::ensureExtension<dd4hep::rec::VariantParameters>(det);
+  if (xml_det.hasChild(_Unicode(envelope))) {
+    xml_comp_t x_envelope = xml_det.child(_Unicode(envelope));
+    envelope_params.set<double>("envelope_r_min", getAttrOrDefault(x_envelope, _U(rmin), 0.));
+    envelope_params.set<double>("envelope_r_max", getAttrOrDefault(x_envelope, _U(rmax), 0.));
+    envelope_params.set<double>("envelope_z_min", getAttrOrDefault(x_envelope, _U(zmin), 0.));
+    envelope_params.set<double>("envelope_z_max", getAttrOrDefault(x_envelope, _U(zmax), 0.));
+  }
+  // Add the volume boundary material if configured
+  for (xml_coll_t boundary_material(xml_det, _Unicode(boundary_material)); boundary_material;
+       ++boundary_material) {
+    xml_comp_t x_boundary_material = boundary_material;
+    DD4hepDetectorHelper::xmlToProtoSurfaceMaterial(x_boundary_material, envelope_params,
+                                                    "boundary_material");
+  }
+  // Add the volume layer material if configured
+  for (xml_coll_t layer_material(xml_det, _Unicode(layer_material)); layer_material;
+       ++layer_material) {
+    xml_comp_t x_layer_material = layer_material;
+    DD4hepDetectorHelper::xmlToProtoSurfaceMaterial(x_layer_material, envelope_params,
+                                                    "layer_material");
+  }
+
   // Construct module
   xml_comp_t xml_module = xml_det.child(_U(module));