– There will be a serious attack on the whole body and have been unlucky the whole house braka together, although the plaster looks completely intact out.
Ulrika Mebus, architectural curator at the museum of Gotland, poke in the wooden frame of a 1700-century house in Visby. Craftsmen have just knocked off the plaster and the expected surprise – sill, the chimney which the house rests, are totally route. Large chips fall onto the street when you touch it and now everything must be changed , which is neither easy nor cheap.
This is the plaster. The old house has been plastered on the 1900s with the so-called KC-plaster, a mixture of lime mortar and cement, instead of pure lime mortar used in Visby since the Middle Ages.
KC plaster is denser than the mortar and encapsulates the moisture that accumulates in the body. When the moisture will rot the wood. This is how far from the only thing that rots in Visby.
– I would think that it is for more than a century, says Kristin Beam Stone, who conducts research on lime mortar on Campus Gotland.
Since 2010, one must seek planning permission for all repairs of stucco in Visby inner city and building code regulates that only add lime mortar on old wooden house.
But a round neckline, among masons on Gotland shows that there are still plastered with KC-plastering of the inner city, and several masons say that you do not need to seek planning permission for repairs.
Kristin Beam Stone says that masons generally have poor knowledge on materials and often give wrong advice to homeowners.
– They look very warranty period. They want to add something that will last for five years, instead of looking at something that has kept 300 years could be repaired and keep another 300 years.
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