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Fix large structural cracks in stucco.
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Sikaflex and Mor-flexx caulking.
I used Sikaflex first as the membrane was torn and very deep. Sikaflex caulking is stronger than Mor-flex, but I did want a sandy finish hence the Mor-flex on top.
Quikrete also makes caulking with sand, which is just as good as Mor-flex.
This is another way to repair a large structural crack in a cement stucco wall with Sikaflex 1A polyurethane caulking, then Mor-Flxx caulking with sand, or throw some stucco sand in it.
The video here explains a similar way of repairing structural cracks.
• Expanding foam or back... Structural large cracking on stucco walls, no problem.
How to fix a huge crack in stucco.
Fix a large structural crack with polyurethane caulking. Note that this caulking is a real drag to work with as it’s far from water-soluble or can be cleaned up with water.
This professional-grade caulking is a powerful adhesive sealant capable of adhering even porous bricks together.
How do I know this fact?
I repaired a brick retaining wall that a car hit for my neighbor, and today, 20 years later, kids are still walking on it.
This caulking ain’t engineered or designed for being user-friendly or applied pretty, but instead, it’s the king or, as they say, these days, the goat of caulking.
The crack shown here is structural, meaning it will always move.
I feel it’s best to use a flexible material under the circumstances.
There are about 20 different methods to repair this crack; however, this is what I would do if it were my home.