10/03/2026
Planning a 40x40x16 shop with roll-up doors? Core lesson: choose wall height from the clear opening you need plus the door headroom and any slab drop at the opening, not just the door size printed on a quote. Roll-up drums and tracks sit above the opening, so a door that matches wall height can still lose clearance without planning. Pick the height with a tape-measure mindset so trucks, lifts, and trailers actually fit.
Checklist: measure your tallest item with add-ons; add the required headroom from the door manufacturer; confirm any slab recess or ramp delta.
DM HEADROOM CHECK for opening sizes, door model, and a quick eave-height rule of thumb.