There should be about 1 1/2" under the door before flooring.
It depends on the weight and width of the door. Three would be a standard amount.
There is not a quote "standard" door width as doors can be purchased in 2" increments. There are a few building code restrictions for minimum width of certain doors. Like an egress door is required to be 36 inches in width for a residence. There can also be minimum widths for handicap accessibility. These doors in a house need to have a clear opening width of 30 inches.
Yes, an ADA bathroom should be 36". Other doors that are not required acess doors, closets ect, have no minimum.
1. Before taking any measurements, first check for any potential obstructions that would affect the installation of storm door. 2. Measure the height of the door. 3.Measure the width of the door. 4.Now estimate the door measurements. 5. According to your measurements order a standard sized storm door and if required use z-bar to fulfill the required width. Sources: plissescreen.com, wikihow.com
Passive ventilation should suffice for a garden shed,if you will be inside do not close the door.
For a 30" door, the rough opening would be 32" in width and 82" in height. Check with your local building inspection department just in case a larger door is required.
width of car door
The most often chosen width of a front door is 36".
Width (excluding door mirrors): 66.1 in. (1.68m) Width (including door mirrors): 76.4in. (1.94m).
The width of a door is the distance between the side jambs. The detail of door measurement is shown at the web link below.
39 inch is the standard width of any door of house. 36 is the standard width (3 feet).
A residential main entry is 3 ft - 0 inches wide and 6 ft 8 in tall. The rough opening for the door and frame to fit into is 3 inches larger on the width and 1-1/2 inch on the height which will allow for the door and jamb and also any necessary adjustment required to plumb and/or square the door unit.