diff --git a/src/components/floor-plan/modal/basic/step/Trestle.jsx b/src/components/floor-plan/modal/basic/step/Trestle.jsx
index c6dfa244..6bdfd8ce 100644
--- a/src/components/floor-plan/modal/basic/step/Trestle.jsx
+++ b/src/components/floor-plan/modal/basic/step/Trestle.jsx
@@ -267,6 +267,7 @@ const Trestle = forwardRef((props, ref) => {
         ...moduleSelectionData,
         roofConstructions: newAddedRoofs.map((roof, index) => {
           return {
+            roofIndex: index,
             addRoof: {
               ...moduleSelectionData.roofConstructions[index]?.addRoof,
               ...roof.addRoof,