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I have some tongue and groove floorboards from a bathroom.

They measure 0.83" thick and are probably about 90 years old.

Where can I get some boards that are equally thick? Tongue and groove is a bonus, but mainly I care about the thickness. They will be covered so I don't care about look. I'd even be willing to layer two boards together.

A plumber who worked on it replaced them with 0.75" boards but that left a noticeable sagging area.

I don't really know how to ask for it - is there a nominal name/trade name for 0.83" boards?

wooden floor boards

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If you want to match that thickness exactly, you'll have to get something custom milled, or planed down from 1" stock.

The difference between .83" and 0.75" is just over a 16th of an inch. Probably an extra layer of tar paper would make up the difference.

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  • Tar paper wouldn't make up the difference here because the tongue and groove will keep it in place even with the extra backing. – Pᴀᴜʟsᴛᴇʀ2 Mar 10 '15 at 0:53

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