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When upgrading your windows, you’ll need to decide whether to install replacement windows or go with a nail fin installation. Each method has its benefits, so selecting the right one depends on your specific needs.
When to choose a nail fin installation
A nail fin installation is best for homes with high exposure to wind, rain and sunlight—especially south-facing gable walls on two-story homes. The “nail fin” method involves installing a new window with an integrated fin that secures it to the home’s framing, which provides better weather resistance and structural integrity. If your home’s exterior is already in poor condition, a nail fin installation is a good choice because it’ll prevent potential water leaks and long-term damage.
When to choose window replacement
If your existing window frames are still in good shape, a replacement window (also called an insert window) can be a simpler, less invasive installation. This method fits the new window into the existing frame without disturbing the surrounding siding or trim. However, if your home has poor exterior cladding or is exposed to inclement weather, a replacement window could increase the risk of water infiltration over time.