Stucco is a cement-like material that is used to add texture to the finishing of the wall. It is made with a mixture of cement, lime, sand, and water. Damaged material and improper use of stucco will cause damage to buildings like cracks and blisters in walls. With wear and tear over time, the surface of walls develops cracks, which lead to holes in walls which are very risky.
Cracks and blisters in stucco can be caused by a number of factors, most of which are related to the way the stucco was installed or the materials used. Improper mixing of the stucco ingredients, for example, can cause it to shrink and crack as it dries. And if the stucco is applied too thickly, it can cause the surface to blister. Other causes of cracks and blisters include Settling of the house or foundation, Poor drainage around the foundation, and Vibrations from nearby traffic or construction.
In this article, we will explore some of the most common causes of cracks and blisters in stucco, and we will provide some tips on how to avoid them.
8 Common Causes of Cracks and Fractures in Stucco
1. Improper Stucco Composition
One of the main reasons why stucco fails is because of improper composition. If the stucco is not mixed correctly, or if the wrong ingredients are used, it can lead to cracking and other damage.
Stucco must be mixed in the proper proportions in order to be effective. If the ratio of Portland cement to sand is too high, the stucco will be too hard and brittle. If the ratio of Portland cement to sand is too low, the stucco will be too soft and will not adhere well to the surface. The proper ratio of Portland cement to sand is 3:1.
2. Improper Application of Stucco
Installing stucco is a big job. It’s not something that can be done by just anyone. It takes skill, experience and knowledge to do it right. Unfortunately, not everyone who tries to install stucco does it right. Sometimes, the installation is defective.
The defective installation creates a void underneath the stucco. This can cause water to enter the void and create hydrostatic pressure, which can then lead to cracking and blistering.
This can lead to a number of other problems, including:
- Water damage
- Mold and mildew growth
- Poor energy efficiency
If you have a defective stucco installation, the best thing to do is to have it repaired or replaced by a professional. Trying to fix it yourself will likely only make the problem worse.
3. Applying Stucco Too Thickly
Applying stucco too thickly can cause cracks in the stucco. This is because the stucco will not be able to dry properly, and it will form cracks as it dries. It is important to make sure that you are applying the stucco at the correct thickness so that you do not run into this issue.
4. Settling of House or Foundation
Stucco cracks are caused by foundation settlement, which is when the foundation of a building sinks or settles into non-load-bearing soil. This can cause significant damage to the foundation, and in turn, lead to cracks in the stucco.
Look for corner-to-corner cracks as an indicator of foundation settlement. Other signs of foundation settlement include drywall cracks, inclined floors, and doors that are difficult to open or close.
If you see these signs, it’s important to have the foundation inspected by a professional.
5. Poor Drainage Around the Foundation
When water accumulates near the foundation, it can seep into the cracks in the stucco and cause them to widen. This can lead to further damage to the stucco, as well as to the foundation itself.
If you notice that your stucco cracks appear after periods of heavy rain, it’s likely that poor drainage is the culprit. To fix this problem, you’ll need to improve the drainage around your foundation. This may involve installing a French drain or other types of drainage system. You may also need to make sure that your gutters are clean and functioning properly
6. Vibrations from Nearby Traffic or Construction
Vibrations from nearby traffic or construction also cause cracks in stucco. If there is a lot of traffic or construction going on near your home, the vibrations can cause the stucco to crack.
If you are noticing cracks in your stucco, and you think that the vibrations from traffic or construction may be the cause, you should try to avoid the area as much as possible. You may also want to contact the construction company or the city to see if they can do anything to reduce the vibrations.
7. Inadequate Curing Time
If the stucco is not allowed to cure properly, it can shrink and crack. This is often due to a lack of proper humidity or temperature control. It is essential to make sure the stucco has enough time to cure before painting or applying any other finishes.
8. Use of Low-Quality Materials
The use of low-quality materials often causes cracks in stucco. When the stucco is applied, it is important to use high-quality materials so that they will last for many years. If low-quality materials are used, the stucco will crack and eventually fall off the wall. This can be a costly repair.
It is also important to ensure that the wall is properly prepared before the stucco is applied. If the wall is not properly prepared, the stucco will not adhere correctly and will eventually crack and fall off.
How to Repair Cracks in Stucco
- Inspect the stucco for any cracks or defects before starting the repair process.
- Make sure to clean the area around the crack or defect to ensure that the repair material will adhere properly.
- Use a putty knife or other similar tool to fill the crack or defect with a stucco patching compound.
- Smooth out the patching compound with the putty knife and allow it to dry completely.
- Once the patching compound is dry, paint over it with a matching color of exterior paint.
Prevention Tips for Stucco Cracks
There are several things you can do to prevent stucco cracks, including:
- Inspect the stucco exterior regularly for cracks.
- Seal cracks with a quality elastomeric sealant.
- Repair any water damage to the substrate immediately.
- Patch stucco using the same material as the original finish coat.
- Use caulking to fill in gaps around doors, windows, and other openings.
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Frequently Asked Questions
Should I be worried about cracks in stucco?
If the cracks are small and not growing, you likely don’t have anything to worry about. However, if the cracks are large or growing, you may want to have them inspected by a professional.
Is it normal for stucco to have hairline cracks?
It is not uncommon for stucco to develop hairline cracks over time. These cracks are usually nothing to worry about and can be easily repaired.
Can you repair cracked stucco?
Yes, cracked stucco can be repaired. However, it is important to have the cracks inspected by a professional to determine the best course of action.