Making a mansard roof
Roof shape where the bottom part of the gable or hipped roof is steeper than the top part, creating a kinked shape. Its name is derived from the 17th century French architect Mansard. From the second half of the 19th century, it was often used in small houses to obtain a larger attic floor.
There are three methods for drawing a mansard roof, I will explain all three methods here so that you can draw a mansard roof yourself.
For the sake of clarity I have given the (auxiliary) lines a color;
- Red = guideline of the circle
- Green = guide line
- Blue = width of the house
- Black = the mansard roof
- Yellow = text
In this method I made the house 8 meters wide as an example, so the blue line is the width of my house. First you draw a (semi-) circle that you draw from the center to the outer sides. Then draw a 45 degree line from the center to the left and right side up to the circle. This point is the kink in the roof, from here you draw a line to the top of the circle, and to the end of the width of the house. With this method you have a normal ceiling height and a reasonable attic to store things.
The second method is a bit more difficult to work out. I chose a width of 9 meters, this because areas of 6 have to be divided. You start again with drawing a (semi-) circle just like with the first method. This time you do not place lines at a certain angle, but first draw a line from the center of the width of the house to the center of the circle. Then divide the width into 6 areas as shown, and work out the other lines. Now you are going to draw a circle again, but this time from the middle line. This circle determines the height of the roof. Then draw the lines of the mansard roof, let’s start to the left of the width of the house. Then you draw a line up to the first auxiliary line as shown in the image. Then you draw a line from that point to the height part of the circle, and that’s how you do it in mirror image on the other side. The advantage of this method is that you get a high ceiling, but the disadvantage is that it leaves you with a smaller attic.
Then here’s the last method you have for drawing a mansard roof. I have again maintained a width of 8 meters. First we make another (semi-) circle, then draw a few auxiliary lines at an angle of 30 degrees. You can also divide the circle into 6 parts, this will be the same because the semicircle is 180 degrees, dividing by 6 makes 30. Then the mansard roof can be drawn immediately, let’s start again. You draw from there to the first auxiliary line, from there you draw a line to the middle and you do this in mirror image for the other side. With this hood, the height of the ceiling is the same as the ridge of the attic, which makes the attic quite spacious, but the ceiling height will lead to this.
These methods are very old methods but are still used today to make a mansard roof.