A really simple template, a really repetitive process, and a lot of glue go into this not-so-weekend spiral staircase project
Each stair tread required a little more than a sheet of 3/4 furniture-grade plywood, which is cut on a CNC machine. A single stair tread takes about two hours to assemble, so the completed stairway took about three full days.
The step by step on how to build a DIY spiral staircase
- A three-inch schedule 40 steel pipe was welded to a steel plate and bolted to LVLs in the floor frame.
- Ben glued the plywood to the steel pipe with construction adhesive and the plywood to the plywood with wood glue. He screwed it all together with three-inch finish screws
- He also drove five-inch screws up through the layers, where two treads meet, so strengthen this potential weak spot.
- To finish, he sanded the heck out of it and applied Minwax Polycrylic.
