Pro: Aesthetics

• Many homeowners find the seamless look of seamless vinyl siding to be aesthetically pleasing. On long walls, several seams along the length of a wall can break up the pattern or design of the siding. Seamless vinyl siding is unrolled from a long sheet or cut in a factory to the exact specifications of your exterior walls.
  
  

Con: Improper Installation

• If seamless vinyl siding is installed improperly and not sufficiently supported, it can bow or bend. Without seams to break up the straight lines of the vinyl, imperfections in installation can be more apparent. This makes installing the siding properly a necessity, and for many homeowners renders the job outside the realm of a do-it-yourself project.
  
  

Pro: Fewer Leaks

• With fewer seams and places for moisture and pests to gain access to your walls, seamless vinyl siding does a better job keeping your exterior walls protected. A small amount of moisture left to damage the exterior wall of your home can lead to expensive mold and mildew repair bills. The smooth profile of seamless vinyl siding is an investment against future repairs.
  
  

Con: Price

• Seamless vinyl siding manufacturing and installation cost more than traditional siding. The cost is not typically more than 10 percent over the cost of traditional siding, but for some homeowners that can be enough to render seamless siding an unnecessary luxury. Additionally, seamless vinyl siding must be installed by professionals, which adds the cost of labor for homeowners who would have otherwise installed traditional siding themselves.