Index: Ringtoets/Piping/src/Ringtoets.Piping.IO/Builders/SoilProfileBuilder1D.cs
===================================================================
diff -u -r069921ae1e06e13d8e5e19dd9caa5e8f7b9e1f35 -rd2b5b334c49948fa49297a1d24c13bc98aa6ee1e
--- Ringtoets/Piping/src/Ringtoets.Piping.IO/Builders/SoilProfileBuilder1D.cs	(.../SoilProfileBuilder1D.cs)	(revision 069921ae1e06e13d8e5e19dd9caa5e8f7b9e1f35)
+++ Ringtoets/Piping/src/Ringtoets.Piping.IO/Builders/SoilProfileBuilder1D.cs	(.../SoilProfileBuilder1D.cs)	(revision d2b5b334c49948fa49297a1d24c13bc98aa6ee1e)
@@ -7,7 +7,7 @@
     /// <summary>
     /// Helps in the creation of a <see cref="PipingSoilProfile"/>.
     /// </summary>
-    public class SoilProfileBuilder1D
+    internal class SoilProfileBuilder1D
     {
         private readonly Collection<PipingSoilLayer> layers;
         private readonly string name;
@@ -24,10 +24,17 @@
         /// Creates a new instances of the <see cref="PipingSoilProfile"/> based on the layer definitions.
         /// </summary>
         /// <returns>A new <see cref="PipingSoilProfile"/>.</returns>
-        /// <exception cref="ArgumentException">Thrown when no layers have been added through <see cref="Add"/>.</exception>
-        public PipingSoilProfile Build()
+        /// <exception cref="SoilProfileBuilderException">Thrown when no layers have been added through <see cref="Add"/>.</exception>
+        internal PipingSoilProfile Build()
         {
-            return new PipingSoilProfile(name, bottom, layers);
+            try
+            {
+                return new PipingSoilProfile(name, bottom, layers);
+            }
+            catch (ArgumentException e)
+            {
+                throw new SoilProfileBuilderException(e.Message, e);
+            }
         }
 
         /// <summary>