[elmolino89]

It is not the problem with lime vs another white paint outside of the buildings. Modern paints based often containing TiO2 are more durable.

But I am with you that using lime especially on roofs/sun exposed walls (assuming lime does not eat up some materials) before summer is sensible if done correctly. Otherwise we will have a spike in hospital admissions of ppl splashing lime over themselves.

[rabf]

Modern paints are often not breathable causing moisture to get trapped in the walls causing no end of problems to historic buildings.

[elmolino89]

Good point. Indeed such impermeable to even water vapor paints peal off/cause the damage to bricks/stones under.