On Sun, 1 Nov 2020 11:43:16 +0000, Andy Burns wrote:


https://www.homebase.co.uk/chipboard...-1220-x-320-x-
18mm-3-pack_p404607

Er, so? You can clearly see the T&G that is much more than 1/4",
maybe nearer an inch on those boards, and the taper.

How do you get a 1" thick tongue on a 3/4" thick board?

Ah, I see. 1" long, if you like. Less a easy to flex and spreads the
load.

--
Cheers
Dave.