Look for soft spots or visible rot around windows, doors, and corners where water tends to collect. You can gently press on panels near ground level to see if they feel spongy, which indicates moisture damage behind the surface. Pay attention to any gaps where trim meets siding, as these openings allow humid air and rain to reach the sheathing underneath. If you notice multiple problem areas or if your siding is more than 20 years old, replacement usually makes more sense than patching individual sections.

Salt particles carried inland on coastal breezes settle on siding surfaces and gradually corrode metal fasteners, trim, and flashing if they're not rated for marine environments. This corrosion weakens the hold of panels and creates rust stains that run down lighter-colored exteriors. We use stainless steel or coated fasteners and apply protective sealants to metal components during installation to prevent this breakdown. Regular washing helps remove salt buildup before it has time to cause lasting damage.

We remove old siding in most cases because it lets us inspect the sheathing and framing for hidden moisture damage or rot that needs repair. Installing over existing material can trap humidity between layers and create conditions for mold growth, especially in coastal areas with high moisture levels. Removing the old siding also gives us a flat, clean surface for proper fastener placement and ensures new panels align correctly with windows, doors, and trim. The extra labor to strip the exterior pays off in long-term performance and durability.