I have broken up a tongue and groove floor near a wall during a construction project. The goal was to remove the planks whole, but the result is that the planks can now only be used as firewood... 
The broken-up floor was laid sometime in the 50s and is 27 mm thick. However, it has been sanded at some point, so it was probably thicker originally.
I wonder if tongue and groove flooring is in "standard dimensions"? Can I get some new planks that fit the groove with the existing floor?
The broken-up floor was laid sometime in the 50s and is 27 mm thick. However, it has been sanded at some point, so it was probably thicker originally.
I wonder if tongue and groove flooring is in "standard dimensions"? Can I get some new planks that fit the groove with the existing floor?
I encountered the same problem during the summer, I needed about 3m2 of floor planks, pine flooring 28 x 120 from the late '70s. I took a sample and went around to different hardware stores, there wasn't a corresponding pine floor to buy, but there was spruce. It ended with me tearing up the rest of the floor and laying a new floor from the local supplier. So the answer to your question is maybe, if you're lucky.
Google around for solid flooring, e.g., Siljan. It comes in many different dimensions, and can vary by a few mm from one manufacturer to another. Otherwise, it's probably not a huge deal to buy a floorboard that's a few mm thicker and plane it down. Plane equally on each side so that the tongue fits correctly against the old one, and check the dimensions of the old tongue so it matches. Otherwise, one might even skip the tongue on an outer board. It depends a bit on the floor construction and/or load.