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Exterior Walls - Mechanical Damage: Causes, Risks, and Solutions
Exterior Walls - Mechanical Damage: Causes, Risks, and Solutions
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Written by Nathan Toothman
Updated over 2 months ago

Mechanical damage to exterior walls can arise from a variety of sources, including human activity, natural events, or environmental factors. Unlike wear and tear that occurs over time, mechanical damage is typically caused by physical force or impacts that harm the structure of the walls. Whether it’s due to accidents, storms, or the wear of construction materials, mechanical damage can lead to significant structural issues if not addressed promptly.

This article explores the causes of mechanical damage to exterior walls, the risks it poses, and how to fix it.

Causes of Mechanical Damage to Exterior Walls

  1. Accidental Impact

    • Vehicles, equipment, or other objects can accidentally crash into the exterior walls, especially in areas close to driveways, roads, or parking lots. A car bumping into the wall, for example, can cause cracks, dents, or even structural damage to the exterior.

  2. Extreme Weather Events

    • High winds, hailstorms, and flying debris can cause mechanical damage to exterior walls. Wind gusts can drive objects like tree branches or outdoor furniture into the walls, resulting in punctures, cracks, or surface damage. Hailstorms can create pitting and dings on walls, especially if the exterior is made of materials like vinyl or metal.

  3. Vandalism or Trespassing

    • Acts of vandalism, such as graffiti, or unauthorized access by trespassers can also lead to mechanical damage. This might include scratches, dents, and other forms of physical harm to the exterior surfaces. Vandals may also cause more severe damage by attempting to break windows, doors, or other exterior elements.

  4. Construction or Renovation Damage

    • During construction, renovation, or even routine maintenance, tools, machinery, and equipment can cause mechanical damage to the exterior walls. Heavy equipment used for nearby projects, such as landscaping or home additions, can inadvertently harm walls through collisions or impacts.

  5. Pest Activity

    • Certain pests, such as rodents or birds, can cause mechanical damage to the walls. For instance, rodents may gnaw on wooden parts, while birds might peck at or damage the surface of exterior cladding. This can weaken the structure and expose it to further environmental damage.

  6. Shifting Soil or Settling

    • In some cases, shifting soil or a settling foundation can create mechanical stress on exterior walls, leading to cracks or misalignments. Although this is more of a gradual process, it is still a form of mechanical stress that results in visible damage to the exterior.

Risks of Mechanical Damage to Exterior Walls

  1. Compromised Structural Integrity

    • Even minor mechanical damage can weaken the exterior walls and compromise the structural integrity of the home. This can lead to cracks that expand over time or weaken the materials that make up the wall, such as siding, framing, or masonry.

  2. Water Infiltration

    • Cracks or holes in the exterior walls caused by mechanical damage allow water to enter the structure. Once water seeps into the wall, it can cause further damage, such as rot, mold growth, and corrosion of materials. This can lead to more costly repairs and long-term issues if not addressed quickly.

  3. Decreased Energy Efficiency

    • Damage to the exterior walls can compromise the insulating properties of your home. Gaps, cracks, and holes in the walls can allow air to escape, leading to increased heating and cooling costs. Over time, this can significantly reduce your home’s energy efficiency.

  4. Increased Risk of Pest Infestation

    • Physical damage to the walls can create entry points for pests, such as insects, rodents, or birds. These pests can damage the structure further, causing long-term problems and even posing health risks to the occupants of the home.

  5. Aesthetic Issues

    • Mechanical damage to the exterior walls can be unsightly, leading to reduced curb appeal. Cracks, dents, scratches, or other forms of damage can make the home look neglected or unattractive, potentially affecting its value.

  6. Decreased Property Value

    • Visible mechanical damage can affect the resale value of your home. Buyers may be concerned about the cost of repairs or the potential for further damage, making them less likely to make an offer or negotiate a lower price.

How to Address Mechanical Damage to Exterior Walls

  1. Assess the Extent of Damage

    • The first step in addressing mechanical damage is to carefully assess the extent of the damage. Minor scratches or dents may only require cosmetic repairs, while more severe damage, such as large cracks or structural shifts, may require professional attention.

  2. Repair Cracks and Holes

    • For cracks or holes in the walls, clean the affected area and apply appropriate patching materials. For wood siding or drywall, use wood filler or joint compound, and for brick or masonry walls, use a suitable mortar or sealant. Be sure to smooth the repair to blend in with the surrounding area.

  3. Replace Damaged Materials

    • If the damage is too severe to be patched, replacing the damaged materials may be necessary. This is especially important if the damage affects structural components, such as load-bearing walls or wooden framing. In some cases, entire sections of siding, drywall, or brick may need to be replaced to restore the wall’s integrity.

  4. Reinforce the Wall

    • For damage that affects the structural integrity of the wall, additional reinforcement may be required. This could include installing additional bracing, reinforcing beams, or using steel supports to ensure that the wall remains secure and stable.

  5. Waterproof the Repair

    • After repairing the mechanical damage, consider applying a waterproof sealant or paint over the affected area to prevent water infiltration. This is particularly important for exterior walls exposed to the elements, as it helps protect against future moisture-related damage.

  6. Check for Underlying Issues

    • Sometimes mechanical damage can reveal underlying problems, such as foundation settling, pest infestations, or structural weaknesses. It’s important to have the area professionally inspected if you notice unusual signs of damage, such as shifting walls, significant cracks, or warped surfaces.

  7. Paint or Refinish the Area

    • Once the repair work is completed, repaint or refinish the affected areas to restore the appearance of the wall. Use high-quality, weather-resistant paint to ensure that the wall is well-protected against the elements moving forward.

Preventing Mechanical Damage to Exterior Walls

  1. Install Protective Barriers

    • Install barriers such as bumpers, bollards, or fencing around areas where vehicles or heavy equipment might accidentally collide with the walls. This can help prevent accidental impacts and reduce the likelihood of damage.

  2. Regularly Maintain Exterior Surfaces

    • Regularly inspect and maintain the exterior surfaces of your home to catch any minor damage before it becomes more serious. This includes checking for cracks, dents, or scratches, and making prompt repairs to prevent further deterioration.

  3. Secure Outdoor Areas

    • Secure outdoor spaces, such as patios, gardens, or play areas, to prevent objects from being blown into the walls during storms or high winds. Keep furniture, toys, and other movable items away from the exterior walls.

  4. Control Pest Activity

    • Ensure that pests do not cause mechanical damage to your walls by sealing entry points, such as cracks around windows, doors, or vents. Regularly inspect for signs of pests and address any infestations quickly.

  5. Limit Exposure to Extreme Weather

    • Consider installing protective coverings, such as storm shutters, on windows and doors, especially in areas prone to hailstorms or high winds. This can minimize the potential for mechanical damage during severe weather events.

When to Call a Professional

For more significant mechanical damage, such as structural cracks, foundation issues, or when the damage is extensive, it’s best to call a professional contractor or structural engineer. They can assess the situation and recommend appropriate repairs to ensure that the wall’s integrity and safety are restored.

Conclusion

Mechanical damage to exterior walls can result from a variety of sources, ranging from accidents and severe weather to vandalism and pest activity. While minor damage can often be repaired by homeowners, significant structural damage requires professional attention. By addressing mechanical damage promptly and taking steps to prevent future incidents, you can maintain the safety, appearance, and value of your home. Regular maintenance and vigilance are key to protecting the exterior walls from further damage and ensuring the long-term integrity of your property.

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