How to Figure Door Size

Ideal Door overlaps header 1”, overlaps jambs 2” each side, and 2” above floor. These doors mount to the outside face of your building frame; this allows for full clearance of opening Top door hinge requires 6” of header to mount and beyond door width 3” each side Door can close against face of concrete at bottom or 2” above floor -if door closes against face of floor, a 2” lip will be required.

Door is mounted to exterior of the building. For proper seal at the Bottom, floor should extend at least 3” beyond the outside plane of building. To prevent frost heave, dig down and taper floor face so frost cannot heave floor extending beyond building footing. In new construction, offset perimeter footing 3” through opening and 3” beyond jamb width or use foam board insulation under floor detruding beyond edge of footing.

Ideal to measure top and bottom of opening width on existing building to make sure it’ll fit! New construction crew; “Build it right or it’ll suck!”

Keep in mind, our standard width pricing is maximum width of 2” over even footage of price sheet. So a 30’ door max width is 30’2”; make your opening 29’10” or it’ll be next door size cost. We can cut doors to the nearest 1/4 inch at no cost. Give us exact measurements. Cold climates will heave floors up into doors. Make sure you have either a footing tied to floor through opening or the door closes to the Exterior or interior slab under the door without frost protection will not work for any large span door no matter what brand or style it is! 2” foam board under and face of thickened floor through opening is minimal. Frost depth footing is done right. There is some tolerance in all measurements, but never depend on tolerances! The beautiful thing about this door is that it isn’t a welded together contraption that would cost a lot of money to be re-fabricated into a hole if it fit. It’s as simple as a circular saw and wood carbide blade to cut it for a desperate situation!