- Jamb and framing condition
- Sound mounting faces support accurate anchorage. Split lumber, weak blocking, deteriorated material, or unfinished structural changes may require coordinated preparation before door installation.
- Insulation and finish
- Thermal construction, interior backing, panel profile, exterior colour, decorative elements, and corrosion-resistant finishes determine the selected door sections and related hardware.
- Headroom and ceiling obstructions
- Low ceilings, beams, ducts, lighting, heaters, storage racks, and sloped roofs can change the lift arrangement, rear supports, and installation access.