diff --git a/web/app/cad/craft/loft/schema.js b/web/app/cad/craft/loft/schema.js
index e963272a..ae1aa3d3 100644
--- a/web/app/cad/craft/loft/schema.js
+++ b/web/app/cad/craft/loft/schema.js
@@ -2,7 +2,8 @@ export default {
   sections: {
     type: 'array',
     itemType: 'loop',
-    initializeBySelection: true
+    initializeBySelection: true,
+    min: 2
   },
   boolean: {
     type: 'enum',
diff --git a/web/app/cad/craft/materializeParams.js b/web/app/cad/craft/materializeParams.js
index 064cdfdd..d4e5e473 100644
--- a/web/app/cad/craft/materializeParams.js
+++ b/web/app/cad/craft/materializeParams.js
@@ -62,6 +62,13 @@ export default function materializeParams(services, params, schema, result, erro
       } else if (md.type === 'array') {
         if (!Array.isArray(value)) {
           errors.push({path: [...parentPath, field], message: 'not an array type'});
+          continue;
+        }
+        if (md.min !== undefined && value.length < md.min) {
+          errors.push({path: [...parentPath, field], message: 'required minimum ' + md.min + ' elements'});
+        }
+        if (md.max !== undefined && value.length > md.max) {
+          errors.push({path: [...parentPath, field], message: 'required maximum ' + md.max + ' elements'});
         }
         if (md.itemType === 'object') {
           value = value.map((item , i) => {