Understanding House Wraps
Before we can answer this question, it is essential to understand what a house wrap is and how it functions. A house wrap is a breathable material installed on the exterior walls of a house before the siding is applied. It acts as a barrier against external moisture, like rain or snow, while allowing water vapor inside the house to escape, preventing mold and rot formation. House wraps also offer thermal resistance, enhancing the energy efficiency of the building.
The Importance of Removing the Existing Wrap
To maintain the integrity of the house and ensure the new wrap functions optimally, it is generally recommended to remove the existing wrap before installing a new one. While it might seem convenient to install a new wrap directly over the old one, it can have several disadvantages that outweigh the convenience.
- Trapped Moisture: If the existing wrap has not been installed correctly or has developed any tears or gaps over time, moisture might be trapped between the old and new wraps. This trapped moisture can lead to mold growth, rot, and a weakened structure.
- Limited Effectiveness: The integrity of the existing wrap may have been compromised due to exposure to the elements. By installing a new wrap over the old one, you are essentially relying on two weakened layers of protection, reducing the overall effectiveness of the house wrap system.
- Aesthetics and Insulation: Over time, the existing wrap may have aged or discolored, and installing a new wrap over it will not solve these issues. Moreover, house wraps often have a thickness that can impact the siding’s flushness and prevent a smooth installation. Removing the existing wrap allows for the inspection of the sheathing and the ability to properly seal any gaps, ensuring a proper installation of the new wrap.
The Downside of Removing the Existing Wrap
While it is generally recommended to remove the existing wrap, there are a few downsides to consider. Removing the old wrap can be time-consuming and labor-intensive, especially if it has been installed with staples or adhesive. Moreover, it might increase the project cost and potentially expose the underlying sheathing to the elements during the installation process.
Professional Opinion and Consultation
Given the intricacies and potential risks involved, it is advisable to consult with a professional contractor before making a decision. An experienced contractor will be able to assess the condition of your existing wrap, the sheathing underneath, and provide expert advice on the best course of action for your specific circumstances. They can weigh the pros and cons, consider your budget and aesthetic preferences, and guide you towards the most suitable solution.
While it may be tempting to install a new house wrap over an existing wrap for the sake of convenience, it is generally recommended to remove the old wrap beforehand. The potential risks of trapping moisture, reduced effectiveness, and compromised aesthetics outweigh the convenience factor. Consulting with a professional contractor to assess your specific situation is essential to ensure the longevity, effectiveness, and proper installation of your new house wrap. Remember, maintaining the integrity and functionality of your house’s exterior is crucial for protecting your investment and ensuring a comfortable living environment.