In the PVC wall paneling industry, thicker is not always better. The interior walls and the space between the front and back wall of the panel are the weaker parts of the overall design. If you increase this space (the thicker the panel, the more you stretch the interior wall), you have now effectively decreased the overall strength of the panel. Therefore, a 3/8" panel is much stronger and longer lasting than a 1/2" panel.
WHY DELPRO PANELS ARE NO MORE THAN 16" WIDE
If you have weight or tension on the panel (insulation or an angled fastener), it creates pressure between both ends and eventually the panel starts to bow or sag. In the PVC paneling industry, it is proven that 16" is the best and maximum width to use. DelPro 1238™ and DelPro 1638™ are easily able to withstand these pressures and will not bow or sag.