Silane hybrid paint on monuments?
Conserving and protecting historic buildings often involves applying a finish coat of mineral paint. This approach is mainly adopted because of its high vapour permeability, as well as historical considerations. In addition, a paint also has to protect the building as effectively as possible, without requiring frequent maintenance.
Lime paint ticks all the boxes, in terms of vapour permeability and respecting historic buildings, but has a number of major disadvantages.
- In practice, “pure” lime paint does not provide a lasting finish coat in our Belgian climate.
- It requires frequent maintenance.
- If lime paints are used, acid rain and sulphur dioxide (formation of calcium sulphate) pose threats, which cannot be ignored.
- Biological colonisation and grime rapidly attack the paint.
- It is only recommended if there is no possibility of it coming into direct contact with heavy rain.
Silicate-based paint is a more resistant system. But the colours are difficult to “manage”. At the same time, mixing and applying this type of paint is fairly time-consuming. In addition, this paint rapidly becomes dirty, if the environmental factors are unfavourable.
If you select a silicate-based paint, you will be opting for an irreversible system. Although silicate-based paint is the most vapour permeable solution, it becomes increasingly less breathable every time another coat is applied.
Should I consider using hybrid silane paint?
Painting historic buildings with hybrid silane paint is not only something to consider, it is actually recommended. Hybrid silane paints like Tensiocoat TG even meet all the criteria for paints applied to historic buildings.
This paint not only looks like a matt mineral lime paint, it is by nature extremely water repellent. This means that it will also protect the historic building, as effectively as possible, against heavy rain, grime and greening. Its water vapour permeability is also very high.
Another important aspect for historic buildings coated with a hybrid silane paint is that this paint is reversible, unlike mineral paints. Hybrid silane paint is easy to remove using an environment-friendly paint stripper.
In addition, treatment using hybrid silane paint will be more durable and only require maintenance at far longer intervals, which enables major savings. It is no easy task to add heat insulation to historic buildings. But keeping the walls dry helps to insulate them. Unlike mineral paints, applying a hybrid silane paint will fully protect the bricks against rainwater, which keeps the brickwork as dry as possible and preserves its insulation value.
For all these reasons, hybrid silane paint like Tensiocoat TQ from Rewah is the perfect solution for historic buildings.