diff --git a/src/util/skeleton-utils.js b/src/util/skeleton-utils.js
index b10fb9a1..db895d9f 100644
--- a/src/util/skeleton-utils.js
+++ b/src/util/skeleton-utils.js
@@ -871,7 +871,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
                         //newPStart.y = wallLine.y1;
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.x2).minus(roofLine.x2).abs().toNumber()
-                        newPStart.y = Big(wallBaseLine.y1).minus(rLineM).abs().toNumber()
+                        newPStart.y = Big(wallBaseLine.y1).minus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPStart.y, x: newPStart.x })
                         if (inLine) {
                           if (inLine.x2 > inLine.x1) {
@@ -927,7 +927,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
 
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.x2).minus(roofLine.x2).abs().toNumber()
-                        newPEnd.y = Big(wallBaseLine.y2).plus(rLineM).abs().toNumber()
+                        newPEnd.y = Big(wallBaseLine.y2).plus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPEnd.y, x: newPEnd.x })
                         if (inLine) {
                           if (inLine.x2 > inLine.x1) {
@@ -1041,7 +1041,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
                         //newPStart.y = wallLine.y1;
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.x1).minus(roofLine.x1).abs().toNumber()
-                        newPStart.y = Big(wallBaseLine.y1).plus(rLineM).abs().toNumber()
+                        newPStart.y = Big(wallBaseLine.y1).plus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPStart.y, x: newPStart.x })
                         if (inLine) {
                           if (inLine.x2 > inLine.x1) {
@@ -1096,7 +1096,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
 
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.x2).minus(roofLine.x2).abs().toNumber()
-                        newPEnd.y = Big(wallBaseLine.y2).minus(rLineM).abs().toNumber()
+                        newPEnd.y = Big(wallBaseLine.y2).minus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPEnd.y, x: newPEnd.x })
                         if (inLine) {
                           if (inLine.x2 > inLine.x1) {
@@ -1229,7 +1229,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
                       } else {
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.y1).minus(roofLine.y1).abs().toNumber()
-                        newPStart.x = Big(wallBaseLine.x1).plus(rLineM).abs().toNumber()
+                        newPStart.x = Big(wallBaseLine.x1).plus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPStart.y, x: newPStart.x })
                         if (inLine) {
                           if (inLine.y2 > inLine.y1) {
@@ -1282,7 +1282,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
                         //newPEnd.x = wallLine.x2;
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.y2).minus(roofLine.y2).abs().toNumber()
-                        newPEnd.x = Big(wallBaseLine.x2).minus(rLineM).abs().toNumber()
+                        newPEnd.x = Big(wallBaseLine.x2).minus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPEnd.y, x: newPEnd.x })
                         if (inLine) {
                           if (inLine.y1 > inLine.y2) {
@@ -1392,7 +1392,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
                         //newPStart.x = wallLine.x1;
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.y1).minus(roofLine.y1).abs().toNumber()
-                        newPStart.x = Big(wallBaseLine.x1).minus(rLineM).abs().toNumber()
+                        newPStart.x = Big(wallBaseLine.x1).minus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPStart.y, x: newPStart.x })
                         if (inLine) {
                           if (inLine.y2 > inLine.y1) {
@@ -1446,7 +1446,7 @@ const createInnerLinesFromSkeleton = (roofId, canvas, skeleton, textMode) => {
                         //newPEnd.x = wallLine.x2;
                         //외곽 라인 그리기
                         const rLineM = Big(wallBaseLine.y2).minus(roofLine.y2).abs().toNumber()
-                        newPEnd.x = Big(wallBaseLine.x2).plus(rLineM).abs().toNumber()
+                        newPEnd.x = Big(wallBaseLine.x2).plus(rLineM).toNumber()
                         const inLine = findLineContainingPoint(innerLines, { y: newPEnd.y, x: newPEnd.x })
                         if (inLine) {
                           if (inLine.y1 > inLine.y2) {