diff --git a/src/hooks/roofcover/useRoofShapePassivitySetting.js b/src/hooks/roofcover/useRoofShapePassivitySetting.js
index 14c648f0..cabcbe90 100644
--- a/src/hooks/roofcover/useRoofShapePassivitySetting.js
+++ b/src/hooks/roofcover/useRoofShapePassivitySetting.js
@@ -263,7 +263,13 @@ export function useRoofShapePassivitySetting(id) {
     addPitchTextsByOuterLines()
     const roof = drawRoofPolygon(wall)
     addLengthText(roof)
-    lines.forEach((line) => line.bringToFront())
+
+    // 외벽선은 WALL/ROOF 폴리곤 바로 위에 배치 — 맨 앞(bringToFront)으로 올리면
+    // offset 0인 변에서 같은 좌표에 그려진 보조선의 클릭을 가로채 선택을 막는다
+    const polygonTopIdx = canvas
+      .getObjects()
+      .reduce((top, obj, idx) => (obj.name === POLYGON_TYPE.WALL || obj.name === POLYGON_TYPE.ROOF ? idx : top), -1)
+    lines.forEach((line) => canvas.moveTo(line, polygonTopIdx))
 
     canvas.renderAll()
   }
diff --git a/src/hooks/roofcover/useRoofShapeSetting.js b/src/hooks/roofcover/useRoofShapeSetting.js
index 58fec3df..be939b1b 100644
--- a/src/hooks/roofcover/useRoofShapeSetting.js
+++ b/src/hooks/roofcover/useRoofShapeSetting.js
@@ -155,9 +155,15 @@ export function useRoofShapeSetting(id) {
           })
 
           addPitchText(line)
-          line.bringToFront()
         }
       })
+
+      // 외벽선은 WALL/ROOF 폴리곤 바로 위에 배치 — 맨 앞(bringToFront)으로 올리면
+      // offset 0인 변에서 같은 좌표에 그려진 보조선의 클릭을 가로채 선택을 막는다
+      const polygonTopIdx = canvas
+        .getObjects()
+        .reduce((top, obj, idx) => (obj.name === POLYGON_TYPE.WALL || obj.name === POLYGON_TYPE.ROOF ? idx : top), -1)
+      outerLines.forEach((line) => canvas.moveTo(line, polygonTopIdx))
       canvas.renderAll()
     }
   }, [])