Siding can crack for a variety of reasons, often stemming from environmental factors, installation issues, or the natural aging process of the material itself. Understanding these causes is the first step towards addressing the problem and preventing further damage to your home’s exterior.

Common Causes of Siding Cracking

The exterior of your home is constantly exposed to the elements, and over time, this continuous barrage can take its toll. Several factors contribute to siding cracking, ranging from external forces to internal material degradation.

Temperature Fluctuations and Expansion/Contraction

One of the most prevalent causes of siding cracks, especially in climates with significant temperature swings, is the natural expansion and contraction of building materials. Siding, regardless of its composition, will expand when heated and contract when cooled. If the siding is not installed with adequate expansion gaps or if fasteners are too tight, this natural movement can create stress points. Over time, these stresses accumulate, leading to cracks, particularly along edges, seams, or around penetrations like windows and doors.

Impact Damage

Physical impact is another common culprit. This can occur from various sources:

• Hailstorms: Large hailstones can strike siding with considerable force, creating dents and cracks. The severity of the crack often depends on the size and hardness of the hail, as well as the type and thickness of the siding material.
• Lawn equipment: String trimmers and lawnmowers can accidentally strike the lower portions of siding, causing chips and cracks.
• Falling debris: Branches from trees, or other objects falling onto the siding, can also lead to impact damage.
• Sports equipment: Balls from games, especially in areas close to play spaces, can cause impact marks and cracks.

Improper Installation

Even the highest quality siding can fail prematurely if it’s not installed correctly. Common installation errors that lead to cracking include:

• Over-nailing: Tightening fasteners too much can restrict the siding’s ability to expand and contract, leading to stress and cracking. Nails should be snug but allow for some movement.
• Lack of expansion gaps: As mentioned earlier, insufficient space for expansion and contraction is a major contributor.
• Improper overlap: If siding panels are not overlapped correctly, water can seep in, freeze and expand, or the panels may not be adequately supported, leading to stress.
• Incorrect fastening of accessories: Trim pieces, corner posts, and starter strips must be installed in a way that allows for siding movement without tearing or stressing the panels.

Material Degradation and Aging

All siding materials have a lifespan, and as they age, they can become more brittle and susceptible to cracking. This is particularly true for older siding materials or those that have been exposed to harsh environmental conditions for an extended period.

• UV exposure: Prolonged exposure to ultraviolet radiation from the sun can break down the chemical bonds in some siding materials, making them less flexible and prone to cracking.
• Moisture damage: Siding materials that absorb moisture can swell and then shrink as they dry, leading to internal stresses that can manifest as cracks. Some materials are more susceptible to this than others.
• Freeze-thaw cycles: In colder climates, water that seeps into small cracks can freeze, expand, and widen the crack. Repeated freeze-thaw cycles can exacerbate existing damage and create new cracks.

Foundation Settlement

While less common as a direct cause of small cracks, significant foundation settlement can put immense stress on the entire structure of your home, including the siding. If the foundation shifts unevenly, it can cause the walls to warp, leading to larger, more structural cracks in the siding panels.

Manufacturing Defects

Although rare, some siding may have inherent manufacturing defects that can lead to premature cracking. This could be due to inconsistencies in the material, improper curing, or other production issues.

Understanding Siding Material and Cracking

The type of siding you have plays a significant role in how and why it might crack. Different materials have varying degrees of susceptibility to the causes listed above.

• Vinyl Siding: Most prone to cracking due to expansion/contraction issues, impact damage from hail or debris, and becoming brittle in extreme cold.
• Fiber Cement Siding: Generally more durable and resistant to impact and rot. However, improper installation or extreme, rapid temperature changes can still cause cracks, especially around pre-drilled holes.
• Wood Siding: Can crack due to natural drying and shrinking, as well as impact and moisture absorption. Rot and insect damage can also weaken the wood, making it prone to cracking.
• Metal Siding: Less prone to cracking from temperature changes but can be susceptible to denting and cracking from significant impacts.

What to Do About Siding Cracks

Once you notice siding cracks, it’s important to address them promptly. Small cracks can seem minor, but they can allow water to penetrate the wall system, leading to more significant problems like mold, rot, and structural damage.

For minor cracks, a repair might be possible, but significant cracking often indicates a larger issue, such as improper installation or widespread material degradation. In many cases, replacing the damaged siding sections or even re-siding your entire home may be the most effective long-term solution.

Seeking Professional Help

Identifying the precise cause of siding cracks can be challenging, as multiple factors may be at play. A qualified siding professional can accurately diagnose the problem, assess the extent of the damage, and recommend the most appropriate repair or replacement strategy. They possess the expertise and tools to ensure proper installation and prevent future issues.

If you’re experiencing siding cracks, it’s time to get expert advice. Super Siding is a free nationwide service that can connect you with local, independent siding professionals who can inspect your siding and provide solutions. Don’t let small cracks turn into big problems. Call today to get connected with a local siding pro and protect your home’s exterior.