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“It’s not a matter of which door is better … but what door works best for your application.”

Schweiss manufactures two styles of great doors – bi-fold and hydraulic. We’d like to explain the mounting styles of both door styles for both wood and steel structures. Each door style differs on how it mounts onto the building, how much above, and how much below. You need to understand how each door gets mounted to obtain the “Same Clear Opening.”

Does the door get mounted “above” or “under” the building header?

  • Hydraulic doors typically mount “under,” which sacrifices valuable headroom. However, 80% of all hydraulic doors are flush mounted under the building header, which gives you a cleaner look.
  • Bi-fold doors mount “above” the building header, resulting in now loss of headroom. The distance above the header varies with each door size. 90% of all bi-fold doors attached above the clear opening, providing more clearance.

Which door style requires less building support?

  • When lifted by two powerful cylinders exerting forces onto the door sub-frame and building structure, hydraulic doors form a canopy when in the open position, thus hanging outwards from the building.
  • Bi-fold doors fold in the center when opening, thus hanging out half the distance. These doors are opened by multiple lift straps spaced evenly throughout the entire width of the doorframe, thus distributing the door weight evenly onto the building structure.

Schweiss provides Specification Sheets that clearly state the forces of each style door so your building engineer / designer will work with actual door loads to structurally design the best building! The choice is up to you!

There are two places to mount any door, whether it’s a wood or steel structure.

Understanding the difference and seeing the difference can make all the difference. Below you can see door-mounting specifications for both wood and steel structures.

Mounting Specifications – Bi-fold and Hydraulic Doors for Wood Structures

Building Structures
BiFold vs Hydraulic

Mounting Specifications – Bi-fold and Hydraulic Doors for Steel Structures

Building Structures
BiFold vs Hydraulic
BiFold vs Hydraulic
BiFold vs Hydraulic