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Feb 17, 2018 at 20:07 vote accept Daniel Griscom
Feb 17, 2018 at 20:04 comment added Daniel Griscom I checked, and both stairs' treads are 3/4" thick. The basement stair treads at least do NOT have underlying support boards, and I'll bet the same is true for the main stair treads. (And I do qualify as a "heavy load".)
Feb 17, 2018 at 19:24 comment added Michael Karas (continued from above) then the answer I gave would not be directly applicable. Your other pictures seem indicate that the red oak treads are only 3/4" thick and if those are directly attached to the stair stingers it would not be surprising that the board could crack if a heavy load was placed there at one time. As I said above stand alone treads are generally thicker than just 3/4".
Feb 17, 2018 at 19:17 comment added Michael Karas One thing to question here. Are the basement stairs built also with the same red oak treads? The reason I ask is because the underside of the basement stairs pictured seem to show that the treads there are not oak - more likely fir. Note that it is not uncommon to find stairs boxed in with something like 3/4" fir or other wood and then hard wood treads installed on top of that. The advantage is that treads can be trim style that are just 3/4" inch thick instead of conventional treads which are 1", 1 1/8" or 1 1/4" thick and much more expensive. If you have that construction (continued)
Feb 17, 2018 at 19:08 comment added Michael Karas No the grain can be the same direction if you use some quality hard wood. This is the main reason I have suggested a glue patch. You can run the patch grain at right angles if you want but you would likely need several pieces to gain enough coverage over the length of the tread.
Feb 17, 2018 at 19:04 comment added Daniel Griscom Thanks. I presume that the patch board's grain should be crosswise to the crack (and the tread's grain), correct?
Feb 17, 2018 at 19:02 comment added Michael Karas @DanielGriscom - It does not change my answer at all. Note that some folks would just pre-drill just one pilot hole before the glue application step. They would then install that first screw and then drill the remaining pilot holes as each additional screw is installed. This helps circumvent problems with the board moving around and misaligning with pre-drilled pilot holes.
Feb 17, 2018 at 18:58 history edited Michael Karas CC BY-SA 3.0
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Feb 17, 2018 at 18:54 comment added Daniel Griscom Thanks for the answer. I just corrected my question; it's a popcorn finish, not stucco. Don't know if this changes your answer. (I'd test for asbestos before doing anything.)
Feb 17, 2018 at 18:50 history answered Michael Karas CC BY-SA 3.0