It probably perhaps at one time had a built in gutter that was covering that circular roof.
How to built a curved gutter.
Stand the boards on edge and secure them upright with wood stakes driven into the ground with a hammer behind them.
And that s basically a trough that would have been constructed into the edge of the roof and it would have been round and it would have taken the water to one side or the other of that curve and then deposit it into a normal downspout.
Use a sharpie or magic marker and attach it to the end of a long stick then trace the curve.
Yes it s 50 years old.
Build the forms with 2 by 12 boards for the back of the curb and 2 by 6 boards for the front of the curb and front edge of the gutter.
Step by step guide.
Apply the following formula.
Step 1 calculate the radius of the curve.
Coat form boards with cooking oil or similar material to prevent concrete from adhering to them.
Attach the foam board under the eave of the turret with 1 2 screws and a a washer.
Curved staircases for decks and mezzanines.
Step 2 calculate the angle of the curve.
Mark each end of the curve and measure the length of the arc.
Curved staircases are often fitted in the atrium of houses or villas where there is a lot of space available and the curved or helical staircase become the central feature.
Measure the width and depth of the curve.
Modern curved staircases give a unique touch of class to any interior design being this a private house or a commercial place here is our guide on how to build modern curved stairs.