added by newinbrussels
(3 months ago)
Another modern-style detail is to omit the riser entirely. You'll still have a rise, of course (you wouldn't get upstairs without it), but it's just empty space instead of a board. Building a stair this way means you won't be able to hide the supporting structure of the stair: the stringer. In the stair pictured here, the stringer is made of steel.
Most wooden staircases have two or three wooden stringers, angled lumber with sawtooth cuts where the treads and risers attach. For safety, a stair that doesn't have a riser should have a thicker tread, like the one shown. This reduces the space between treads.
Most codes will not permit an open riser unless the opening is 4 inches or less. Although you'll see stairs that don't follow this rule, a child could crawl through a larger space, so for safety's sake, build to code.