I think the paint holds the moisture in accelerating the crystal growth. I often thought that outside brickwork the faces of the brick were eroded by frost expanding the moisture. Great video thanks.
It's interesting that the paint does not accelerate crystal growth. Salt crystals can only form and grow during dehydration in the presence of evaporation, as the water has to evaporate for the salts to dry and crystallize. Frost can also make masonry crumble, but in the UK it's not major factor - however salts are! Just think of a basement. The reason why most basements crumble badly is not because of the frost (most basements don't freeze as there is some heat present) but because of the high amount of salts originating from the ground from rising and penetrating damp. As the moisture evaporates on the internal face of the basement, salts are drawn tot he surface, they crystallize and break down the paint, plaster, the tanking etc. and it all crumbles away. You can read more about the effect of salts here: www.coreconservation.co.uk/the-effect-of-ground-salts-onto-masonry
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I think the paint holds the moisture in accelerating the crystal growth. I often thought that outside brickwork the faces of the brick were eroded by frost expanding the moisture. Great video thanks.
It's interesting that the paint does not accelerate crystal growth. Salt crystals can only form and grow during dehydration in the presence of evaporation, as the water has to evaporate for the salts to dry and crystallize.
Frost can also make masonry crumble, but in the UK it's not major factor - however salts are! Just think of a basement. The reason why most basements crumble badly is not because of the frost (most basements don't freeze as there is some heat present) but because of the high amount of salts originating from the ground from rising and penetrating damp. As the moisture evaporates on the internal face of the basement, salts are drawn tot he surface, they crystallize and break down the paint, plaster, the tanking etc. and it all crumbles away.
You can read more about the effect of salts here: www.coreconservation.co.uk/the-effect-of-ground-salts-onto-masonry
Very good. Very interesting
Thank you! Cheers!