What is technique for framing arch top windows?
For arch top windows you need to figure the peak(top) and spring point(height at which the arch starts on the sides. If you have the window where you can scribe the contour on the plywood that will be much easier. Typically the window flange will be slightly smaller on the inside of the house, which we will account for a bit later. Usually arch top windows will be a half round. To draw the arch you will need to mark out the plywood to fit inside the window frame. after you have done this, mark the canter of the width on top and bottom if the plywood. Use the measurement for the outside of the window. secure the plywood to the ground with some concrete nails or what have you. Snap a line with a chalk line starting at your center mark on the top of the plywood and extending several feet past the bottom of the plywood making sure that it lines up with the center mark on the bottom of the board. From the peak of the arch, extend a tape measure along the line you have just snapped. Take ano
