diff --git a/src/components/floor-plan/modal/basic/step/Trestle.jsx b/src/components/floor-plan/modal/basic/step/Trestle.jsx
index 0bf9bd50..08bed95b 100644
--- a/src/components/floor-plan/modal/basic/step/Trestle.jsx
+++ b/src/components/floor-plan/modal/basic/step/Trestle.jsx
@@ -23,7 +23,7 @@ const Trestle = forwardRef((props, ref) => {
   const autoSelectTimeoutRef = useRef(null)
 
   // 공통 타임아웃 설정 (밀리초)
-  const AUTO_SELECT_TIMEOUT = 700 // API 호출 완료 대기 시간
+  const AUTO_SELECT_TIMEOUT = 500 // API 호출 완료 대기 시간
   const {
     trestleState,
     trestleDetail,
@@ -66,7 +66,7 @@ const Trestle = forwardRef((props, ref) => {
   const [flag, setFlag] = useState(false)
   const tempModuleSelectionData = useRef(null)
   const [autoSelectStep, setAutoSelectStep] = useState(null) // 'raftBase', 'trestle', 'constMthd', 'roofBase', 'construction'
-
+  const prevHajebichiRef = useRef();
 
   useEffect(() => {
     if (roofs && roofs.length > 0 && !selectedRoof) {
@@ -80,6 +80,15 @@ const Trestle = forwardRef((props, ref) => {
     if (selectedRoof && ["C", "R"].includes(selectedRoof.raftAuth) && roofs && roofs.length > 0) {
       onChangeRaftBase(roofs[0]);
     }
+
+    if (
+      selectedRoof && ["C", "R"].includes(selectedRoof.roofPchAuth) && roofs && roofs.length > 0 &&
+      roofs[0].hajebichi !== prevHajebichiRef.current
+    ) {
+      prevHajebichiRef.current = roofs[0].hajebichi;
+      onChangeHajebichi(roofs[0].hajebichi);
+    }
+
     //모듈 설치 영역 복구
     restoreModuleInstArea()
   }, [roofs, selectedRoof])  // selectedRoof 추가