Vinyl siding is nailed over a plywood base. A vapor barrier between siding and plywood prevents moisture from collecting in the wall. Vinyl expands and contracts up to 10 times more than wood, so proper installation is crucial.
Vinyl is durable in most ways. Paint or stain aren’t needed. Cold can make it brittle, though, and heat can soften it. As temperatures change, gaps may open at seams.
Every spring and fall
30 years
Step 1: Look for damaged pieces of siding. Cracks, splits, and punctures are common in vinyl and can let water through. Repair or replace damaged siding ASAP.
Step 2: Check for crooked, buckled, or warped pieces of siding. These problems could mean the siding wasn’t installed properly. Strong wind can also pull vinyl off. If you see any of these issues, reinstall the siding.
Step 3: Check the joints and corners for gaps. Because vinyl expands and contracts, it shouldn’t be caulked. Yet there shouldn’t be any openings, either. Even a small gap can let water in. If you notice any gaps, close them.
Step 4: Remove anything growing on your siding. Moss, lichen, mold, and vines can damage it. Make sure shrubs are trimmed back at least 6 inches from your walls.
Step 5: If you notice dampness, staining, or trickling water on your vinyl siding when it’s not raining, there may be moisture behind it. If you’re concerned, contact a professional to conduct a moisture test.