I'm working on a threshold.
In room (a) is an oak floor.
In room (b) I've put down a floating floor.
Where they meet is not smooth. Not a clean edge.
Part of the edge of the oak used to be under a half-wall, subsequently removed, that divided the two rooms.
Because of the layout I did not cut the oak to a smooth edge. One end meets a wall corner so I stayed with the current jagged edge instead.
The goal now is to put down a threshold between the two.
It's not going to be too difficult to do, at least putting it down. Making it is another question.

My goal is to do so with a single piece of wood, 11 ft 11 inches.
But off-the-shelf thresholds come in 8 ft at the most, at least what I've seen.
Because of the jagged edge in between I am not going to be able to put down the center strip so often used to hold them down. I'll just block up from beneath and use appropriate screws w/ pilot holes of course.

The plan at this point is to use some 3 1/2" door casing, 12 ft long, that is already arched nicely on one side and simply return the favor on the other side with my router. (Both sides will probably go across the router table just to keep things consistent.) Should make for a nice smooth transition between the two floors.

My query here is for input:
How might you accomplish such a transition with a single piece?
Or would you just go with two pieces off-the-shelf and call it a day?
Or do you have any other ideas that might contribute?

I did the same...took out half wall and needed to flush fit a piece (10'6") 1 1/2 wide. I cut the two floors to fit the new piece and sized it to be flush. At the same time I took a full wall down between kitchen and dining room and put in a saddle 10' long but had to undercut one side of saddle as the two floors were not same height. Worked for me...I used red oak...

Sounds like you are on track I would use...hope this helps...Nick

A pic of the affected area would be a great help. Are the 2 floors running in parallel or at 90 deg.? Are the 2 floors level to each other?
If parallel and level you could run the oak up to it instead of a threshold.
If they're at butt ends are facing an interfacing material is the way to go. The floater floor will probably need to be occluded by the interface material to allow for expansion, the oak moves a little but if it's 5 or more yrs old it's done with most of its moving unless you're in a high moisture and heat area.

Wish I could be more help.

Attached is pdf of how I made a threshold
Momma is happy you did your post because I got this done finally.
Great timing cause I just cleaned the shop and could take pics

Attached Thumbnails

Attached Files

File Type: pdf

threshold.pdf (468.8 KB, 56 views)

BTW anyone know where the word Threshold comes from

My laptop dictionary says:

ORIGIN Old English therscold, threscold; related to German dialect Drischaufel; the first element is related to thresh (in a Germanic sense ‘tread’ ), but the origin of the second element is unknown.

Stick will probably find a better answer.

Though this is a used casing you can see by the lines what I mean by trimming it to become a threshold. Some bottom center support would make it suitably strong.

Flooring is level and relatively parallel.

Perhaps a saw making the cuts as marked in black, then sanding, might be better than the router method I had in mind.

I like the manufactured one shown. If I trimmed out from end to end that *might* be a possibility. Would be really good if I went with a wider threshold, then the wall at one end could be accommodated.

Attached Thumbnails

It appears you cold use a table saw to make three cuts with the bottom of the trim piece vertical against the fence.

I seem to recall it's from the reeds known as threshes used to cover the floor (maybe dirt) and the raised portion at the doorway was to "hold" them in the room.

[Middle English thresshold, from Old English therscold, threscold; see terə-1 in Indo-European roots.]

1. the sill of a doorway.
2. the entrance to a house or building.
3. any point of entering or beginning: the threshold of a new career.
4. Also called limen. the point at which a stimulus is of sufficient intensity to begin to produce an effect: the threshold of consciousness; a low threshold of pain.
[before 900; Middle English; Old English threscold, threscwald, c. Old Norse threskǫldr; akin to thresh in old sense “trample, tread”; -old, -wald unexplained]

https://en.wikipedia.org/wiki/Threshold_%28door%29