The question of whether to remove old siding or cover it with new is a common one for homeowners undertaking exterior renovations. The direct answer is often yes, you can put new siding over old siding, but it is not always the most advisable or cost-effective solution. This approach, known as residing, can be a viable option under specific circumstances, but a thorough assessment of the existing siding and the underlying structure is crucial before making a decision.

Assessing the Existing Siding

The first and most critical step in determining if residing is a feasible option is a comprehensive inspection of the current siding. This involves looking for several key indicators that might preclude you from installing new siding over the old.

Structural Integrity

The most important factor is the structural integrity of the old siding and the wall beneath it. If the existing siding is significantly damaged, rotten, warped, or loose, it must be removed. Installing new siding over a compromised substrate will only mask the problem, leading to more serious issues down the line, such as mold growth, pest infestations, and structural decay. Water damage is a particular concern; if there are signs of moisture intrusion into the walls, the source must be identified and repaired before any new siding is applied. Similarly, if the old siding is buckling or pulling away from the house, it indicates underlying structural problems that need addressing.

Condition of Insulation and Sheathing

It is also essential to consider the condition of the sheathing (the plywood or OSB layer directly behind the siding) and any existing insulation. If the sheathing is soft, rotted, or damaged, it will not provide adequate support for the new siding. In some cases, especially with older homes, the original sheathing might be a solid wood plank system, which is generally strong enough to serve as a substrate. However, if there’s evidence of significant rot or moisture damage, the sheathing may need to be replaced, which often necessitates siding removal.

Type of Existing Siding

The material of your current siding also plays a role. For example, if you have single-layer vinyl siding and wish to install new vinyl siding, it is often possible. However, if you have textured siding that is uneven, it could affect the smooth finish of new siding materials like fiber cement. Wood siding, especially if it’s in poor condition, typically needs to be removed. Shingle siding, whether wood or asphalt, also generally requires removal due to its uneven surface and the potential for moisture trapping.

When Residing is a Suitable Option

Despite the necessary precautions, there are situations where residing is a practical and beneficial choice.

Good Condition of Existing Siding

If your current siding is in good general condition, meaning it is firmly attached, not rotten, and relatively flat, it can often serve as an adequate sublayer. This is particularly true for materials like intact vinyl or well-secured wood siding in less humid climates. The existing siding essentially acts as a protective layer for the sheathing, and the new siding is installed directly over it, often with a weather-resistant barrier in between.

Cost Savings

In many cases, residing can be a more economical option than complete removal and replacement. The labor involved in removing old siding, disposing of it properly, and preparing the walls can be substantial. By skipping this step, homeowners can potentially save on both labor and disposal costs. This can make a significant difference in the overall budget for an exterior renovation project.

Added Insulation and Weather Protection

When new siding is installed over old, it presents an opportunity to add a layer of insulation, often in the form of rigid foam board. This can improve your home’s energy efficiency, leading to lower heating and cooling bills. Furthermore, a properly installed weather-resistant barrier between the old and new siding provides an enhanced defense against moisture intrusion, which is critical for the longevity of your home’s exterior and interior.

Aesthetic Improvement

Residing can dramatically update the look of your home without the mess and disruption associated with full siding replacement. If you’re looking for a quick and effective way to boost curb appeal and modernize your home’s exterior, residing can be an excellent solution, provided the underlying structure is sound.

Considerations for Different Siding Materials

The choice of new siding material will influence whether residing is recommended and how it is implemented.

Vinyl Siding

Vinyl siding is a popular choice for residing projects. It’s lightweight, relatively inexpensive, and can be installed over many existing siding materials, including old vinyl or wood. However, it’s crucial that the existing surface is even. If the old siding is noticeably warped or damaged, it can create an uneven look for the new vinyl.

Fiber Cement Siding

Fiber cement siding is a durable and attractive option. It can be installed over existing siding, but it requires a solid and smooth substrate for proper adhesion and alignment. If the old siding is uneven, it might necessitate some preparation work, or the installation of a furring strip system to create a level surface. Due to its weight, ensuring the structural capacity of the existing walls is paramount.

Wood Siding

Installing new wood siding over old is rarely recommended. The uneven nature of most wood siding, its susceptibility to rot, and the potential for trapping moisture make it a poor substrate. Proper wood siding installation typically involves removing the old material to ensure a sound, flat surface and assess any underlying damage.

Metal Siding

Similar to vinyl, some metal sidings can be installed over existing, sound siding. However, the weight and rigidity of certain metal systems might make a perfectly flat substrate essential. Again, if the old siding has significant imperfections, it could compromise the aesthetic and functional performance of the new metal siding.

The Role of Climate and Maintenance

Your local climate and the general maintenance history of your home are significant factors influencing the decision to reside.

Humid Climates

In areas with high humidity and frequent rainfall, the risk of moisture entrapment is amplified. If you live in such a climate, a thorough inspection for signs of rot and moisture damage in the existing siding and sheathing is non-negotiable. Even if the current siding appears intact, underlying issues can develop over time, leading to significant problems if covered up.

Coastal Regions

Homes in coastal regions face unique challenges from salt spray and high winds. The existing siding may have deteriorated due to these elements. Residing in these areas requires extra attention to sealing and wind resistance, and the integrity of the underlying structure must be thoroughly verified.

Maintenance History

A home that has been consistently and properly maintained is more likely to have siding in a condition suitable for residing. Conversely, if the exterior has been neglected, the chances of underlying damage increase, making removal and replacement a safer bet.

Super Siding Can Help

Navigating the complexities of siding replacement or residing can be daunting. To ensure you make the best decision for your home and budget, it’s beneficial to consult with experienced professionals. Super Siding is a free nationwide service that connects homeowners with local, independent siding professionals who can assess your home’s specific needs and provide expert advice.

Conclusion

In summary, putting new siding over old is possible and can offer cost and time savings under certain conditions. The key is a meticulous inspection to ensure the existing siding and underlying wall structure are sound and free from moisture damage or rot. If these conditions are met, residing can be an effective way to update your home’s exterior. However, if any doubt exists about the integrity of the existing structure, or if the old siding is significantly damaged, the prudent course of action is always to remove it completely and address any underlying issues before installing new siding.

For personalized advice and a professional assessment of your siding situation, it’s highly recommended to consult with local siding experts. Call today to get connected with a qualified siding professional in your area who can help you determine the best approach for your home.