The answer to 'how often to replace soffit' is that the typical lifespan of soffit is 20-30 years, but this can vary depending on the materials and climate. Soffit is the underside of the roof overhang that connects the roof to the exterior walls, and it plays an important role in ventilation and protecting your home from weather. Over time, soffit can become damaged, discolored, or start to sag, indicating it's time for replacement.
Regular inspections and maintenance can help extend the life of your soffit, but eventually it will need to be replaced, especially if you notice any cracks, holes, or other signs of deterioration. Replacing soffit is best left to professional roofing contractors who can ensure proper installation and ventilation to protect your home.