FAQ Knowledge Articles

According to the Marvin Ultimate MultiSlide Door Site Prep Guide, regardless of sill type the foundation must support the sill height variance requirement of 1/16" maximum across the entire sill length.  In conjunction with the sill, the framing of the rough opening must be installed plumb, square, and true within 3/16".  The header must be flat and designed to uphold the deflection requirement of not more than 1/8" over the entire length of the unsupported span when fully loaded.