Clay Poultice

Clay Poultice
Clay poultice for desalination of historic masonry suffering from soluble salt-related decay. Once the poultice has dried out the clay can be removed and the walls rechecked for salt content. This procedure can be repeated until the salt levels are significantly reduced. 

Generally 20mm of Clay poultice will reduce salt content by upto 50% 
 Curing and How

The water contained in the poultice soaks slowly into the wall and dissolves salts, while the poultice shrinks onto the wall face. As the wall dries, water carrying salts in solution is drawn back to the surface by the high suction created by the fine pores in the poultice. The water evaporates and salts precipitate within the poultice, which is left on the wall until it dries out; this may take several weeks, depending on the weather.

The poultice is then removed, taking the salt with it. Two or three cycles of poulticing may be required to reduce salt concentrations down to an acceptable level. 

Made to order with a 4-7 working day lead time