Brick walls are heavy, rigid, solid masonry structures. They have enough strength to support the additional weight, wind load and leverage force created by topper panels. When strong winds hit the topper, the solid brick wall can hold the whole assembly stable without bending or shifting.
Vinyl (PVC) fence panels, by contrast, are hollow‑profile materials. Even though vinyl is durable for normal fencing use, the panels themselves do not have enough structural rigidity to carry extra topper sections. If you mount toppers directly on top of vinyl fence panels, wind pressure will create large leverage stress. This will lead to common problems: vinyl rail bending, panel warping, broken joints, and even posts getting pulled loose over time.
If you own a vinyl fence and hope to gain more yard privacy, there are better alternative solutions. We recommend replacing your existing vinyl fence with taller full‑height vinyl panels, rather than adding toppers on top. This keeps the whole fencing system structurally safe and maintains long‑term performance for your backyard.