diff --git a/src/hooks/module/useModuleBasicSetting.js b/src/hooks/module/useModuleBasicSetting.js
index c2b0398d..365ed1b0 100644
--- a/src/hooks/module/useModuleBasicSetting.js
+++ b/src/hooks/module/useModuleBasicSetting.js
@@ -2677,7 +2677,7 @@ export function useModuleBasicSetting(tabNum) {
 
               isInstall = true
               //마지막에 설치된 모듈의 Y 좌표
-              installedLastHeightCoord = moduleY + width + widthMargin
+              installedLastHeightCoord = moduleY + width + heightMargin
             } else {
               //디버깅용
               /*tempModule.set({ fill: 'transparent', stroke: 'red', strokeWidth: 1 })
diff --git a/src/util/skeleton-utils.js b/src/util/skeleton-utils.js
index 6a3c567e..8ee92c3c 100644
--- a/src/util/skeleton-utils.js
+++ b/src/util/skeleton-utils.js
@@ -404,15 +404,25 @@ export const skeletonBuilder = (roofId, canvas, textMode) => {
   }, { x: 0, y: 0 })
 
   // baseLine을 offset만큼 바깥으로 평행이동
-  const offsetLine = (line) => {
+  const offsetLine = (line, index) => {
     const sp = line.startPoint, ep = line.endPoint
-    const offset = line.attributes?.offset ?? 0
+    let offset = line.attributes?.offset ?? 0
+
+    // 모든 offset이 동일할 때 수치적 안정성을 위해 약간의 변화 추가
+    if (baseLines.every(l => (l.attributes?.offset ?? 0) === offset)) {
+      offset += index * 0.01  // 각 라인에 약간의 차이 추가
+    }
+
     const edx = ep.x - sp.x, edy = ep.y - sp.y
     const len = Math.hypot(edx, edy)
     if (len === 0) return { sp: { ...sp }, ep: { ...ep } }
+
+    // 수직 벡터 계산 (항상 바깥 방향)
     let nx = -edy / len, ny = edx / len
-    const mid = { x: (sp.x + ep.x) / 2, y: (sp.y + ep.y) / 2 }
-    if (nx * (centroid.x - mid.x) + ny * (centroid.y - mid.y) > 0) { nx = -nx; ny = -ny }
+
+    // 방향 결정 로직 제거 - 항상 바깥으로 확장
+    // if (nx * (centroid.x - mid.x) + ny * (centroid.y - mid.y) > 0) { nx = -nx; ny = -ny }
+
     return {
       sp: { x: sp.x + nx * offset, y: sp.y + ny * offset },
       ep: { x: ep.x + nx * offset, y: ep.y + ny * offset }
@@ -433,37 +443,47 @@ export const skeletonBuilder = (roofId, canvas, textMode) => {
       isSamePoint(point, line.startPoint) || isSamePoint(point, line.endPoint)
     )
     if (adjLines.length < 2) return { ...point }
-    const oL1 = offsetLine(adjLines[0]), oL2 = offsetLine(adjLines[1])
+    const idx1 = baseLines.indexOf(adjLines[0])
+    const idx2 = baseLines.indexOf(adjLines[1])
+    const oL1 = offsetLine(adjLines[0], idx1), oL2 = offsetLine(adjLines[1], idx2)
     return lineIntersect(oL1.sp, oL1.ep, oL2.sp, oL2.ep) || { ...point }
   })
 
   // 중복 좌표 및 일직선 위의 불필요한 점 제거 (L자 확장 시 사각형으로 단순화)
-  const simplifyPolygon = (pts) => {
-    let result = [...pts]
-    let changed = true
-    while (changed) {
-      changed = false
-      for (let i = result.length - 1; i >= 0; i--) {
-        const next = result[(i + 1) % result.length]
-        if (Math.abs(result[i].x - next.x) < 0.5 && Math.abs(result[i].y - next.y) < 0.5) {
-          result.splice(i, 1)
-          changed = true
-        }
-      }
-      for (let i = result.length - 1; i >= 0 && result.length > 3; i--) {
-        const prev = result[(i - 1 + result.length) % result.length]
-        const curr = result[i]
-        const next = result[(i + 1) % result.length]
-        const cross = (curr.x - prev.x) * (next.y - prev.y) - (curr.y - prev.y) * (next.x - prev.x)
-        if (Math.abs(cross) < 1) {
-          result.splice(i, 1)
-          changed = true
-        }
-      }
-    }
-    return result
-  }
-  changRoofLinePoints = simplifyPolygon(changRoofLinePoints)
+  // const simplifyPolygon = (pts) => {
+  //   let result = [...pts]
+
+  //   // 복잡한 형태 보호를 위해 최소 6개 점 유지
+  //   if (result.length <= 6) return result
+
+  //   let changed = true
+  //   while (changed) {
+  //     changed = false
+  //     for (let i = result.length - 1; i >= 0; i--) {
+  //       const next = result[(i + 1) % result.length]
+  //       if (Math.abs(result[i].x - next.x) < 1.0 && Math.abs(result[i].y - next.y) < 1.0) {
+  //         result.splice(i, 1)
+  //         changed = true
+  //       }
+  //     }
+  //     // 최소 6개 점 유지 확인
+  //     if (result.length <= 6) break
+
+  //     for (let i = result.length - 1; i >= 0 && result.length > 3; i--) {
+  //       const prev = result[(i - 1 + result.length) % result.length]
+  //       const curr = result[i]
+  //       const next = result[(i + 1) % result.length]
+  //       const cross = (curr.x - prev.x) * (next.y - prev.y) - (curr.y - prev.y) * (next.x - prev.x)
+  //       // 복잡한 형태 보호를 위해 임계값 대폭 증가
+  //       if (Math.abs(cross) < 50) {
+  //         result.splice(i, 1)
+  //         changed = true
+  //       }
+  //     }
+  //   }
+  //   return result
+  // }
+  // changRoofLinePoints = simplifyPolygon(changRoofLinePoints)
 
   let roofLineContactPoints = [...changRoofLinePoints]