diff --git a/src/util/qpolygon-utils.js b/src/util/qpolygon-utils.js
index ae079777..b160998f 100644
--- a/src/util/qpolygon-utils.js
+++ b/src/util/qpolygon-utils.js
@@ -995,6 +995,21 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
     const prevLine = prevBaseLine.line
     const nextLine = nextBaseLine.line
 
+    if (prevBaseLine.size !== prevLine.attributes.planeSize) {
+      prevLine.x1 = prevBaseLine.x1
+      prevLine.y1 = prevBaseLine.y1
+      prevLine.x2 = prevBaseLine.x2
+      prevLine.y2 = prevBaseLine.y2
+      prevLine.setCoords()
+    }
+    if (nextBaseLine.size !== nextLine.attributes.planeSize) {
+      nextLine.x1 = nextBaseLine.x1
+      nextLine.y1 = nextBaseLine.y1
+      nextLine.x2 = nextBaseLine.x2
+      nextLine.y2 = nextBaseLine.y2
+      nextLine.setCoords()
+    }
+
     let { x1, x2, y1, y2, size } = currentBaseLine
     let beforePrevBaseLine, afterNextBaseLine
 
@@ -1616,8 +1631,8 @@ export const drawRidgeRoof = (roofId, canvas, textMode) => {
           currentAngle === afterNextAngle
             ? Big(afterNextLine.attributes.offset)
             : Big(afterNextLine.attributes.offset).plus(currentLine.attributes.offset)
-        const prevSize = Big(prevLine.attributes.planeSize).div(10)
-        const nextSize = Big(nextLine.attributes.planeSize).div(10)
+        const prevSize = Big(calcLinePlaneSize(prevLine)).div(10)
+        const nextSize = Big(calcLinePlaneSize(nextLine)).div(10)
 
         let prevHipCoords, nextHipCoords