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Stairs / Attachment methods11/3
I have a 3 sets of open stairs to build. I want to pre build them as a break down set , have them stained and finished and shipped to the site. What attachment methods have other stair builders used to secure the treads to the stringers. other than screwing through the outside of the stringer and plugging the hole.
Standard open treads are usually made with an angled router bit like a dovetail bit but with a very shallow angle. You route slots in the stringers that trap the treads and the entry of the slot is wider which allows a wedge to be place in the slot locking the tread in place. Sometime people put a nail in the wedge to secure it, others don't.
Unless your stringers are thick- 1-1/4"+ - a hanger bolt might not get enough purchase
I tried the pocket hole thing before , i didn’t much like it.
At those thicknesses, railbolts/hanger bolts should work ok.
I haven't tried this, but it's intriguing. It uses metal angle brackets under each tread.
Video of attaching treads from under