Welcome @carvwa,

Page 21:

https://static.tp-link.com/2020/202010/20201019/EAP%20Datasheet.pdf
Note that the diagrams are shown with the EAP's facing up for some reason.  In your case, for a normal ceiling mount, you'll need to flip these over (aka rotate CW 180 degrees).

The upward radiation pattern (if ceiling mounted) is pretty significant.  And since the EAP and mounting bracket are all plastic, there isn't much in the way of shielding -- mainly just the PCB board.

If the 2nd floor EAP is in the kids room above (or nearly so) it will probably hit the garage just fine (mine does).  I live in a bi-level / raised range (long skinny rectangle) approx 2200 sq feet.  I have two indoor EAP, one at each end of the house.  One on the first floor sitting on a table pointed up.  And one on the second floor ceiling mounted pointing down.  I have great coverage throughout.  Signal penetration, even of 5.8GHz, through the floors/ceilings is very good -- in my house at least.

-Jonathan

@JSchnee21 

Awesome, that is exactly what I was looking for.  

That is very significant, wow.  The Cisco AP's a) have metal shielding b) much less upward reflection. (Surely both are by design)

Maybe I'll DC the upstairs one and see how strong of a signal I get.  That should be an easy test.

Great!

Ha Ha, I've seen a lot of plastic devices with a big piece of roughly punched, unfinished steel inside pesumbly just to add weight / heft to make it "feel" more like a premium product!

Often in commercial settings (office buildings, labs, schools, etc.) floors are concrete and/or steel so radiation from floor to floor is often very limted / non-existent regardless.  But in residential construction floors/ceilings may be as little as a sheet of CDX/plywood and two sheets of sheetrock (three if its a garage).

Unless you live in an older home with plaster walls. The supporting mesh under the plaster often makes a very good RF screen / Farraday-like attenuator,

-Jonathan

  @JSchnee21 

Awe...man!   I had forgotten I asked that question then refound someone asking a question just like my own situation!   Then I looked at the poster...it was my own question!

Anyway.    I think I am going to try you're wire mesh idea.   I purchased some wire mesh for reloading stuff a while back and have a ton of "ap" sized sheets left over.   I'll try to report back my finding (though it might be two more years and I might forget I was the original poster.)    😝