diff --git a/src/orange/orangeinp/detail/CsgUnitBuilder.cc b/src/orange/orangeinp/detail/CsgUnitBuilder.cc
index 0532c842f9..0e6dbbd79c 100644
--- a/src/orange/orangeinp/detail/CsgUnitBuilder.cc
+++ b/src/orange/orangeinp/detail/CsgUnitBuilder.cc
@@ -10,6 +10,7 @@
 #include "corecel/io/Logger.hh"
 #include "corecel/io/StreamableVariant.hh"
 #include "orange/transform/TransformIO.hh"
+#include "orange/transform/TransformSimplifier.hh"
 
 namespace celeritas
 {
@@ -49,6 +50,16 @@ BoundingZone const& CsgUnitBuilder::bounds(NodeId nid) const
     return iter->second.bounds;
 }
 
+//---------------------------------------------------------------------------//
+/*!
+ * Insert transform with simplification and  deduplication.
+ */
+TransformId CsgUnitBuilder::insert_transform(VariantTransform const& vt)
+{
+    auto simplified = std::visit(TransformSimplifier(tol_), vt);
+    return this->insert_transform_(std::move(simplified));
+}
+
 //---------------------------------------------------------------------------//
 /*!
  * Set a bounding zone and transform for a node.
diff --git a/src/orange/orangeinp/detail/CsgUnitBuilder.hh b/src/orange/orangeinp/detail/CsgUnitBuilder.hh
index e60eb6c548..427395d101 100644
--- a/src/orange/orangeinp/detail/CsgUnitBuilder.hh
+++ b/src/orange/orangeinp/detail/CsgUnitBuilder.hh
@@ -79,7 +79,7 @@ class CsgUnitBuilder
     inline NodeInsertion insert_csg(Args&&... args);
 
     // Insert a transform
-    inline TransformId insert_transform(VariantTransform&& vt);
+    TransformId insert_transform(VariantTransform const& vt);
 
     // Insert node metadata
     inline void insert_md(NodeId node, Metadata&& md);
@@ -173,15 +173,6 @@ auto CsgUnitBuilder::insert_csg(Args&&... args) -> NodeInsertion
     return result;
 }
 
-//---------------------------------------------------------------------------//
-/*!
- * Insert transform with deduplication.
- */
-TransformId CsgUnitBuilder::insert_transform(VariantTransform&& vt)
-{
-    return this->insert_transform_(std::move(vt));
-}
-
 //---------------------------------------------------------------------------//
 /*!
  * Insert node metadata.
diff --git a/test/orange/orangeinp/Transformed.test.cc b/test/orange/orangeinp/Transformed.test.cc
index 6ca5600b9d..246a5e049a 100644
--- a/test/orange/orangeinp/Transformed.test.cc
+++ b/test/orange/orangeinp/Transformed.test.cc
@@ -159,12 +159,7 @@ TEST_F(TransformedTest, inverse)
         this->build_volume(Transformed{
             transformed,
             Transformation{make_rotation(Axis::x, Turn{0.25}), {0, 0, -2}}});
-        static char const* const expected_log_messages[] = {
-            "While re-inserting region for node 7: existing transform {} "
-            "differs from new transform {{{1,0,0},{0,1,0},{0,0,1}}, {0,0,0}}"};
-        EXPECT_VEC_EQ(expected_log_messages, scoped_log_.messages());
-        static char const* const expected_log_levels[] = {"warning"};
-        EXPECT_VEC_EQ(expected_log_levels, scoped_log_.levels());
+        EXPECT_TRUE(scoped_log_.empty()) << scoped_log_;
     }
 
     static char const* const expected_surface_strings[] = {
@@ -218,7 +213,7 @@ TEST_F(TransformedTest, deduplicated_inverse)
         = {"Sphere: r=2", "Sphere: r=1"};
     static char const* const expected_volume_strings[] = {"-0", "-1"};
     static char const* const expected_trans_strings[]
-        = {"3: t=0 -> {}", "5: t=2 -> {{{1,0,0},{0,1,0},{0,0,1}}, {0,0,0}}"};
+        = {"3: t=0 -> {}", "5: t=0"};
     static int const expected_volume_nodes[] = {3, 5};
 
     auto const& u = this->unit();