4 Aug 2012
Ivy clad buildings are green!
walls to crack.
They found that ivy acted as a thermal blanket, warming up walls by an average of 15 per cent in cold weather and cooling the surface temperature of the wall in hot weather by an average of 36 per cent. The ivy was also found to absorb some of the harmful pollutants in the atmosphere. Walls where ivy was growing were less prone to the damaging effects of freezing temperatures, temperature fluctuations, pollution and salts than exposed walls without ivy.
However while the findings suggest that ivy has protective qualities for buildings that are intact, they also showed that where walls are already damaged ivy rapidly finds its way into existing cracks and holes in walls. See report at: http://www.english-heritage.org.uk/professional/research/buildings/building-materials/ivy-can-protect-walls/