Is this Hygroscopic salts?

[^woody^]

typified banal response of the uneducated

Do us all a favour then Megamind, educate us or STFU.

 

[^woody^]

capillarity

Which is also why it doesn't rise up many courses of clean, unplastered, unrendered, cement-mortar brickwork, because the pore size in the mortar and the bricks is different, and it doesn't easily move from large pores to small.

In my house (outdoor walls below DPC) it only rises one brick, then stops dead.

Plus something called gravity.

Oh, and pressure.

And err, salinity.

Viscosity, yes add that.

While we are at it, porosity.