Upright Fence Company | Expert Fence Contractors in Portsmouth, NH

Frost heave is the primary cause. In winter, the ground freezes and thaws repeatedly, pushing posts upward and sideways. This is especially common in Portsmouth's clay-heavy soils near the Piscataqua River. Our solution involves excavating the affected post, setting it below the frost line (typically 48 inches), and using gravel backfill for drainage to prevent water from pooling and freezing around the base.

Yes, that's almost certainly wood rot caused by moisture exposure. It's very common in Portsmouth due to high humidity, rain, and snow melt. We can replace individual rotted pickets or sections, but if the rot extends into the rails or posts, a full replacement of that panel may be needed. We also recommend weatherproofing treatments and proper ground clearance to prevent recurrence.

We start with a high-quality exterior-grade stain or paint that contains UV blockers and water repellents. Before application, we clean the fence and let it dry completely. We apply two coats, paying special attention to end grains and joints. For Portsmouth homes near the water, we may recommend a marine-grade sealant for extra salt air protection. Annual inspections and touch-ups extend the fence's life significantly.