You can find cone calculators online.
How to make a round roof out of paper.
To make a truly round roof in metal you need eitehr tapered panels or some of the metal panels will work.
If you are using extra long roof supports place exactly half of the short pieces in between them to make sure the roof supports end up opposite each other.
The most common underlayment is roofing felt which is similar to tar paper but felt uses asphalt instead of tar.
To make a funnel or cone from paper start by tracing a wide triangle onto a sheet of paper.
But before you roll out the row of paper above the stack cut a 2 or 3 ft.
Make sure the piece is large enough so that the next row of.
Lay out the lumber.
The wood rotted out and i replaced it all with a domed cement roof the roof is intended to be used as sort of a mini park area so i made a stairway to get up onto it and a rebar trellis over it to provide shade for people and to help keep the house cooler.
Section of self stick underlayment cut a hole in it slightly smaller than the diameter of the stack and slide it over the stack.
Make sure the two shorter sides are the exact same length then cut the triangle out.
Make 3 more little lines out of the wet paper.
Structurally your options include putting the roof panels just over a framing system.
Push them against a straight edge to make sure the bases line up.
Next take one of the far corners and roll it into the center so the paper s edge is touching the middle of the triangle.
Lay out the lumber flat on the ground touching each other along the long edges.
It improves look and uniformity because your roof deck might not lie perfectly straight or flat a layer of roof paper gives an even uniform surface upon which you can install your shingles.
Leave the house out to dry in the sun.
Beginning at the bottom where you started with the sheathing roll the underlayment out flat going lengthwise across the sheathing.
The main purpose of the underlayment is waterproofing.
I used aluminum sheet coil but you could use paper or any flat material.
You ll follow the same process of wetting the paper to make the roof.
When installing the felt paper over a stack it s ok to make an oversize hole.
If you segment the roof into a bunch of pie shapes though you can use other panels as well.
Continue to make more lines.
Here is one way to make a cone from flat stock.