On 2007-01-16, Goedjn wrote:

I thought that the tongue in T&G was oversized to produce the
proper spacing, by force..

At least in the boards I am using, the groove is slightly wider than
the tongue and noticeably deeper. So the boards do butt together
tightly if I wish--I'm just trying to figure out in what weather
conditions (if any) it is OK to install that tightly.

Cheers, Wayne