![]() It is somewhat more complicated to fill cracks. So before DIYers apply an ETICS, they should be very sure. If, by mistake, the damage is not caused by plastering at all but by a dynamic crack, there will be profound damage to the structure, which can also destroy the composite thermal insulation system. The insulation boards themselves bridge the cracks, and the reinforcing fabric, which is necessary anyway, does the rest. If you plan to wrap your house up warm anyway, you can combine crack repair and thermal insulation with a composite thermal insulation system. The requirements for this are simple, but mandatory: the old plaster adheres firmly and does not sand off. In other words, a new layer of plaster is simply applied. This is an overplastering of part or all of the facade. Large shrinkage cracks, numerous age spots and a heavily tarnished appearance, on the other hand, require more of an area-wide approach. The decisive factor is ultimately the extent of the work required. ![]() Suitable materials are available for both in DIY stores. In principle, the do-it-yourselfer willing to renovate has two options: For example, the plaster loses its adhesion and hollow spots develop – or the plaster becomes porous and crumbles away.īecause of their many causes, there is no universal recipe for optimally repairing plaster cracks. Age damage: Some cracks in the exterior plaster of a building are purely the result of age.Notch cracks also occur in composite thermal insulation systems when the plaster reinforcement at the corners of windows and doors is inadequate or non-existent. They are usually the result of stresses in the masonry – which is, however, intact. Notch cracks: These occur primarily at the corners of wall openings such as windows and continue diagonally from there.In a sense, the plaster sags away at the bottom, thickening there while cracking at the top. Bag cracks: These occur when plaster has been applied too thickly, for example to compensate for an unevenness in the substrate.They can be recognized by their usually net-like structure (also called craquelure). The cause is usually tension between the plaster layers, which can also cause the plaster to detach from the substrate along the crack. Shrinkage cracks, often called stress cracks: They often occur months after plastering work has been completed.This happens especially on dry and sunny days. They occur when plaster layers dry out too quickly. Shrinkage cracks: They are probably the most common type.Moisture can then penetrate at this point and cause damage.īuilders distinguish several types of plaster cracks, whose designation already suggests the cause: They are often harmless, but some plaster-related cracks can penetrate all layers of plaster and extend to the substrate, i.e. They can be easily made visible by wetting them with clear water from a spray bottle. ![]() Surface cracks, which only affect the plaster itself but not the structure, are only a few millimeters deep and usually spread over a wide area, which is why they are also called hairline or net cracks.
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