Exterior wall cladding installed in horizontal rows or courses that overlap to shed water and provide weather protection, available in various materials including wood, vinyl, fiber cement, and metal, creating the classic American residential appearance while offering durability, maintenance options, and design flexibility.

Horizontal siding is exterior wall cladding installed in horizontal rows or courses that overlap to shed water and provide weather protection, available in various materials including wood, vinyl, fiber cement, and metal, creating the classic American residential appearance while offering durability, maintenance options, and design flexibility. This traditional siding orientation has been the predominant exterior cladding method in North American residential construction for centuries, providing effective weather protection through its overlapping design that directs water away from the building structure. Horizontal siding offers architects and homeowners numerous material choices, installation methods, and aesthetic options while maintaining proven performance in diverse climate conditions.

The primary purposes of horizontal siding include providing weather protection by creating a barrier against rain, wind, and moisture infiltration, enhancing building aesthetics through various materials, colors, and textures, improving energy efficiency when properly installed with appropriate insulation and air barriers, offering design flexibility through different profiles, widths, and installation patterns, providing durability and longevity with proper material selection and maintenance, enabling cost-effective installation and repair compared to some alternative cladding systems, and delivering proven performance in various climate conditions from coastal to continental environments.

Installation principles for horizontal siding involve overlapping courses that create a weather-shedding surface, proper fastening techniques that allow for thermal expansion and contraction, integration with building paper or house wrap for moisture management, flashing installation at windows, doors, and other penetrations, starter strips at the bottom course to establish proper angle and drainage, and finishing details at corners, eaves, and other transitions.

Fun Fact: Horizontal siding, specifically clapboard, was brought to America by English colonists in the 1600s and became so synonymous with American architecture that it’s called “American siding” in many countries! The term “clapboard” comes from the Dutch word “klappen” meaning “to split,” referring to how the boards were originally split from logs. The longest piece of horizontal siding ever installed was 127 feet long on a custom home in Montana, requiring special transportation and installation techniques. Interestingly, the White House uses horizontal wood siding painted white, and it takes 570 gallons of paint to cover the entire exterior!

• Z-Flashing (horizontal flashing behind siding overlaps)
• Beveled Siding
• Lap Siding