diff --git a/src/util/qpolygon-utils.js b/src/util/qpolygon-utils.js
index 231a511b..bb55d939 100644
--- a/src/util/qpolygon-utils.js
+++ b/src/util/qpolygon-utils.js
@@ -2181,7 +2181,8 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
       const isAlreadyRidge = baseGableRidgeLines.find(
         (line) =>
           (line.x1 === ridgePoint[0] && line.y1 === ridgePoint[1] && line.x2 === ridgePoint[2] && line.y2 === ridgePoint[3]) ||
-          (line.x1 === ridgePoint[2] && line.y1 === ridgePoint[3] && line.x2 === ridgePoint[0] && line.y2 === ridgePoint[1]),
+          (line.x1 === ridgePoint[2] && line.y1 === ridgePoint[3] && line.x2 === ridgePoint[0] && line.y2 === ridgePoint[1]) ||
+          segmentsOverlap(line, { x1: ridgePoint[0], y1: ridgePoint[1], x2: ridgePoint[2], y2: ridgePoint[3] }),
       )
       if (baseRidgeCount < getMaxRidge(baseLines.length) && !isAlreadyRidge) {
         const ridgeLine = drawRidgeLine(ridgePoint, canvas, roof, textMode)
@@ -2974,6 +2975,41 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
             }
           }
         }
+      } else {
+        if (ridgeLine) {
+          const ridgeEdge = { vertex1: { x: ridgeLine.x1, y: ridgeLine.y1 }, vertex2: { x: ridgeLine.x2, y: ridgeLine.y2 } }
+          const prevRoofEdge = { vertex1: { x: prevRoof.x1, y: prevRoof.y1 }, vertex2: { x: prevRoof.x2, y: prevRoof.y2 } }
+          const nextRoofEdge = { vertex1: { x: nextRoof.x1, y: nextRoof.y1 }, vertex2: { x: nextRoof.x2, y: nextRoof.y2 } }
+          const isPrevRoof = edgesIntersection(prevRoofEdge, ridgeEdge)
+          const isNextRoof = edgesIntersection(nextRoofEdge, ridgeEdge)
+          if (isPrevRoof && isPointOnLine(ridgeLine, isPrevRoof)) {
+            polygonPoints.push({ x: isPrevRoof.x, y: isPrevRoof.y })
+          } else {
+            polygonPoints.push({ x: prevRoof.x1, y: prevRoof.y1 })
+          }
+          if (isNextRoof && isPointOnLine(ridgeLine, isNextRoof)) {
+            polygonPoints.push({ x: isNextRoof.x, y: isNextRoof.y })
+          } else {
+            polygonPoints.push({ x: nextRoof.x2, y: nextRoof.y2 })
+          }
+
+          roof.lines
+            .filter((line) => line !== currentRoof && line !== prevRoof && line !== nextRoof)
+            .forEach((line) => {
+              const lineEdge = { vertex1: { x: line.x1, y: line.y1 }, vertex2: { x: line.x2, y: line.y2 } }
+              const intersection = edgesIntersection(ridgeEdge, lineEdge)
+              if (intersection && isPointOnLine(ridgeLine, intersection)) {
+                const size1 = Math.sqrt(Math.pow(line.x1 - intersection.x, 2) + Math.pow(line.y1 - intersection.y, 2))
+                const size2 = Math.sqrt(Math.pow(line.x2 - intersection.x, 2) + Math.pow(line.y2 - intersection.y, 2))
+                if (size1 < size2) {
+                  polygonPoints.push({ x: line.x2, y: line.y2 })
+                } else {
+                  polygonPoints.push({ x: line.x1, y: line.y1 })
+                }
+                polygonPoints.push({ x: intersection.x, y: intersection.y })
+              }
+            })
+        }
       }
       /** 중복되는 포인트 제거 */
       const uniquePoints = []
@@ -4891,20 +4927,41 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
           prevEndPoint.y = Big(intersection.y)
         }
       }
-      const overlapLine = baseHipLines.find((line) => isPointOnLine(line, { x: prevEndPoint.x.toNumber(), y: prevEndPoint.y.toNumber() }))
+      const overlapLine = baseHipLines.find(
+        (line) =>
+          isPointOnLineNew({ x1: x1, y1: y1, x2: prevEndPoint.x.toNumber(), y2: prevEndPoint.y.toNumber() }, { x: line.x1, y: line.y1 }) ||
+          isPointOnLineNew({ x1: x1, y1: y1, x2: prevEndPoint.x.toNumber(), y2: prevEndPoint.y.toNumber() }, { x: line.x2, y: line.y2 }),
+      )
 
       if (overlapLine) {
+        let size1, size2
         if (
-          isPointOnLine({ x1: x1, y1: y1, x2: prevEndPoint.x.toNumber(), y2: prevEndPoint.y.toNumber() }, { x: overlapLine.x1, y: overlapLine.y1 })
+          isPointOnLineNew({ x1: x1, y1: y1, x2: prevEndPoint.x.toNumber(), y2: prevEndPoint.y.toNumber() }, { x: overlapLine.x1, y: overlapLine.y1 })
         ) {
-          prevEndPoint.x = Big(overlapLine.x1)
-          prevEndPoint.y = Big(overlapLine.y1)
+          size1 = Math.sqrt(Math.pow(x1 - overlapLine.x1, 2) + Math.pow(y1 - overlapLine.y1, 2))
         }
         if (
-          isPointOnLine({ x1: x1, y1: y1, x2: prevEndPoint.x.toNumber(), y2: prevEndPoint.y.toNumber() }, { x: overlapLine.x2, y: overlapLine.y2 })
+          isPointOnLineNew({ x1: x1, y1: y1, x2: prevEndPoint.x.toNumber(), y2: prevEndPoint.y.toNumber() }, { x: overlapLine.x2, y: overlapLine.y2 })
         ) {
-          prevEndPoint.x = Big(overlapLine.x2)
-          prevEndPoint.y = Big(overlapLine.y2)
+          size2 = Math.sqrt(Math.pow(x1 - overlapLine.x2, 2) + Math.pow(y1 - overlapLine.y2, 2))
+        }
+        if (size1 && size2) {
+          if (size1 < size2) {
+            prevEndPoint.x = Big(overlapLine.x1)
+            prevEndPoint.y = Big(overlapLine.y1)
+          } else {
+            prevEndPoint.x = Big(overlapLine.x2)
+            prevEndPoint.y = Big(overlapLine.y2)
+          }
+        } else {
+          if (size1) {
+            prevEndPoint.x = Big(overlapLine.x1)
+            prevEndPoint.y = Big(overlapLine.y1)
+          }
+          if (size2) {
+            prevEndPoint.x = Big(overlapLine.x2)
+            prevEndPoint.y = Big(overlapLine.y2)
+          }
         }
       }
       const intersectRidgeLine = []
@@ -5016,20 +5073,41 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
         }
       }
 
-      const overlapLine = baseHipLines.find((line) => isPointOnLine(line, { x: nextEndPoint.x.toNumber(), y: nextEndPoint.y.toNumber() }))
-
+      // const overlapLine = baseHipLines.find((line) => isPointOnLine(line, { x: nextEndPoint.x.toNumber(), y: nextEndPoint.y.toNumber() }))
+      const overlapLine = baseHipLines.find(
+        (line) =>
+          isPointOnLineNew({ x1: x2, y1: y2, x2: nextEndPoint.x.toNumber(), y2: nextEndPoint.y.toNumber() }, { x: line.x1, y: line.y1 }) ||
+          isPointOnLineNew({ x1: x2, y1: y2, x2: nextEndPoint.x.toNumber(), y2: nextEndPoint.y.toNumber() }, { x: line.x2, y: line.y2 }),
+      )
       if (overlapLine) {
+        let size1, size2
         if (
-          isPointOnLine({ x1: x2, y1: y2, x2: nextEndPoint.x.toNumber(), y2: nextEndPoint.y.toNumber() }, { x: overlapLine.x1, y: overlapLine.y1 })
+          isPointOnLineNew({ x1: x2, y1: y2, x2: nextEndPoint.x.toNumber(), y2: nextEndPoint.y.toNumber() }, { x: overlapLine.x1, y: overlapLine.y1 })
         ) {
-          nextEndPoint.x = Big(overlapLine.x1)
-          nextEndPoint.y = Big(overlapLine.y1)
+          size1 = Math.sqrt(Math.pow(x2 - overlapLine.x1, 2) + Math.pow(y2 - overlapLine.y1, 2))
         }
         if (
-          isPointOnLine({ x1: x2, y1: y2, x2: nextEndPoint.x.toNumber(), y2: nextEndPoint.y.toNumber() }, { x: overlapLine.x2, y: overlapLine.y2 })
+          isPointOnLineNew({ x1: x2, y1: y2, x2: nextEndPoint.x.toNumber(), y2: nextEndPoint.y.toNumber() }, { x: overlapLine.x2, y: overlapLine.y2 })
         ) {
-          nextEndPoint.x = Big(overlapLine.x2)
-          nextEndPoint.y = Big(overlapLine.y2)
+          size2 = Math.sqrt(Math.pow(x2 - overlapLine.x2, 2) + Math.pow(y2 - overlapLine.y2, 2))
+        }
+        if (size1 && size2) {
+          if (size1 < size2) {
+            nextEndPoint.x = Big(overlapLine.x1)
+            nextEndPoint.y = Big(overlapLine.y1)
+          } else {
+            nextEndPoint.x = Big(overlapLine.x2)
+            nextEndPoint.y = Big(overlapLine.y2)
+          }
+        } else {
+          if (size1) {
+            nextEndPoint.x = Big(overlapLine.x1)
+            nextEndPoint.y = Big(overlapLine.y1)
+          }
+          if (size2) {
+            nextEndPoint.x = Big(overlapLine.x2)
+            nextEndPoint.y = Big(overlapLine.y2)
+          }
         }
       }