I have just finished putting in the waste for my darkroom sink eighteen months after putting the sink in.
Due to my house bricks appearing to be made of cast iron hardened with weapons grade unobtanium...
Dear Steve,
True story.
In the 1930s, three prototype houses were built in Plymouth (in Swilly, I think) by dockyard boilermakers from riveted mild steel, skinned with brick.
They were always plagued with condensation, and 30 years later they were demolished. Imagine the fun with the wrecking ball...
This is from memory, from the Evening Herald in the 1960s.
Meanwhile, my house has external walls that are maybe 200 years old, 2-3 feet thick, consisting of modest amounts of stone bound together by a good deal of 'chaux' (lime mortar, plus, I think, mud...)
But, USE IT IN GOOD HEALTH, as the old Jewish blessing goes. Drainage is a mitzvah.
Cheers,
R.