Curved Stair Stringers from Built-Up Plywood
Curved Stair Stringers from Built-Up Plywood
(OP)
I have a curved stair that is free standing (not connected to a wall) and was wondering how others designed the stringer. I know how to do this if I were using steel, but the requirements are to be wood. The proposal is to use 10 strips of 1/4" plywood (glued & nailed) to make the beam. I have reviewed the APA documents Plywood Design Specs, Supplements 2 & 5, etc. but nothing has values for 1/4" plywood nor how to account for curved beams. I know the recommended radius is 5' for 1/4" Plywood, but I could not find a reduction value for radii less than recommended (R= 28" for inside stringer).
Any help would be appreciated...
Any help would be appreciated...





RE: Curved Stair Stringers from Built-Up Plywood
RE: Curved Stair Stringers from Built-Up Plywood
RE: Curved Stair Stringers from Built-Up Plywood
RE: Curved Stair Stringers from Built-Up Plywood
A stair case like you are asking about as always fascinated me. I have seen picture of them but never on how they were constructed. I can see how this could work if using a glulam but not laminating 1/4" plywood together for stringers. If you figure this out please make a post. It would be interesting to see. Take lots of picture too. GOOD LUCK.
RE: Curved Stair Stringers from Built-Up Plywood
http://www.arcways.com/video.htm