Types of cracks
Crack formations in the masonry have various causes that need to be discussed. This includes defects in the subsoil or in the foundation. There may also be weak points in the structure or structural errors. Minor damage is often caused by extreme weather conditions.
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This is how it's done
Measure the dimensions of the crack to define the required length of the joint filler profile. In the majority of all cases, a diameter of five millimeters is sufficient for mending, since most of the damage is not wider. If the crack is smaller than the filler strand, expand it with an angle grinder or joint cutter. Sweep the space well with a brush so that the filling seals properly.
Repair damage:
- Fill the crack with PU foam
- Press the joint filler profile directly into the gap
- Cut off hardened foam residues after one hour
Rest of the procedure
Carefully mask the crack in the wall on both sides with painter's tape and brush the repaired areas with an adhesive primer. As a result, the later paint and the sealing acrylic mass will adhere better to the ground. Apply the substance until the surface is saturated.
Tips
A colored deep primer is suitable as a primer for highly absorbent materials such as plasterboard, lime and cement plaster. This solidifies the subsurface and reduces the suction behavior.
post processing
With the help of a squeeze gun, fill all cavities with acrylic mass. Level the substance with a spatula or putty knife. A filler compound is an alternative to acrylic. After the filling has hardened, peel off the painter's tape. The wall is now ready for a new coat of paint.
Special filling materials
Very small damage can be repaired with special fillings so that no filler profile is necessary. Epodite resin seals and connects cracks up to 0.1 millimeter wide. If the gaps are less than 0.2 millimeters wide, cement suspensions provide a force-fit seal. Polyurethane resins are used for damage smaller than 0.3 millimeters. Experts often use cement slurry for cavities with a crack width of less than 0.8 millimeters.
