Door openings shall have a minimum clear opening width of 32 inches; however, if the doorway is more than 24 inches deep, then a minimum clearance of 36 inches is required. The clear opening is measured from the face of the door to the stop of the frame while the door is opened to 90 degrees.
A gap of around 1/8th of an inch is recommended for standard doors to keep the elements out, protect the paint on the trim, and ensure that the door closes and opens smoothly. The right amount of space is equal to the thickness of your door with a little extra room for clearance while opening or closing.
Door openings shall provide a clear width of 32 inches minimum. Clear openings of doorways with swinging doors shall be measured between the face of the door and the stop, with the door open 90 degrees. Openings more than 24 inches deep shall provide a clear opening of 36 inches minimum.
There should be a 2mm or 3mm gap between the door and the frame on both sides and the top. If you do need to cut the door down to size, keep in mind that you need to cut all four sides of the door equally whenever possible to retain an accurate shape or pattern if the door is panelled.
Space at least 60″ deep in front of a door will accommodate a forward approach, except in case of hinge approaches on the pull side. On the pull side of hinge approaches, 36″ minimum latch-side clearance is required if the depth is 60″ minimum (The depth can be 54″ minimum if the latch-side clearance is at least 42″.)
Door openings shall have a minimum clear opening width of 32 inches; however, if the doorway is more than 24 inches deep, then a minimum clearance of 36 inches is required. The clear opening is measured from the face of the door to the stop of the frame while the door is opened to 90 degrees.
Thresholds, if provided at a doorway, must not exceed 3/4 inch in height for exterior sliding doors or 1/2 inch for other types of doors. Changes in level up to 1/4 inch can be vertical and do not need an edge treatment. Changes in level between 1/4 inch and 1/2 inch must have a beveled slope equaling 1:2.
the gap between the underside of the door and unfinished floor should be between 10mm and 22mm, with the ventilation requirements for the building taken into account when determining the gap beneath internal doors.
For reference, standard interior door widths range from 24"-36" (finished opening). While a standard door height is 80" (finished opening). The difference between a rough opening and finished opening is usually 2-3 inches.
Margins (sometimes also called “rebates”) are the spaces between the door and the door frame. These are often important if you're looking at issues with your hinge jamb. Again, these spaces can be broken down into specific types: the hinge margin, strike margin, top (header) margin, and bottom (sweep) margin.
One critical aspect to emphasize is the gap between the door and the floor, which should be between a half-inch and three-quarters of an inch for optimal functionality.
Clearance dimensions are measured all along the length of vertical and horizontal edges, between the door frame and door(s) and between meeting stiles (vertical edges) of paired doors.
The closing, or swing speed must not be faster than five seconds. The closing or swing distance is from the open position at 90 degrees to 12 degrees from the latch. Latching speed isn't specified, but should be fast enough to latch the door but not slam it.
The standard size for a door frame is 80 inches by 36 inches, with the rough opening slightly larger at 82 inches by 38 inches. This standard size can vary depending on how tall are standard doors, the type of door, as well as the specific measurements of your home.
Ceilings of exit routes must be at least 7 feet, 6 inches high. An exit access must be at least 28 inches wide at all points. Where there is only one exit access leading to an exit or exit discharge, the width of the exit and exit discharge must be at least equal to the width of the exit access.
Hold the new door in the frame to see if it needs adjustment. A well fitted door should have a 2mm gap on either side and at the top. The gap at the bottom will depend on the thickness of your flooring/carpet.
Framing rough opening sizes are really quite simple. Just add 2″ to the width of the actual door size. You should add 2-1/2″ to the height of the actual door.
Common widths for internal doors range from 520mm to 920mm, while external door widths often fall between 820mm to 920mm.
As a guide the average undercut of your door should be between 8mm and 10mm, that's around ⅝ inch to ¾ inch from the bottom of the frame. if you are in doubt, shave or cut off a little and if it's not enough, shave off some more. Remember less is better or you may damage the door's structural integrity.
NFPA 80 currently allows a maximum bottom gap of 3/4 in.
In general, the gap beneath an interior door will be between three-quarters of an inch and half an inch. This width depends largely on the type of flooring, as door frames are generally installed when the floor is unfinished. A standard door can have varying levels of clearance over different flooring types.
The height of thresholds can vary anywhere from 1/4″ tall to 1″ or more. ADA requirements may restrict the height of the threshold to 1/2″ tall and a gradual incline no greater than 1/4″ in vertical rise. Thresholds can be supplied in widths from as small as 2″ wide up to 10″ or more.
The minimum width of each door opening shall be sufficient for the occupant load thereof and shall provide a clear width of not less than 32 inches (813 mm).