Residential buildings 3 1 general.
Residential allowable attic height.
Maximum 12 3 vertical height rise for a flight of stairs.
The occupiable floor area has a ceiling height in accordance with section r305 3.
Building codes according to the 2006 international residential code r807 1 attic access homes with combustible materials in the ceiling and roof construction must have an access to attic areas that exceeds 30 square feet and with a vertical height of 30 inches or greater.
The rough framed opening must be a minimum of 22 inches by 30 inches.
Therefore let us recap on the residential stair code requirements.
The occupiable floor area is not less than 70 sq.
Room area is this case is calculated as the total floor space with walls at least 5 feet tall.
In most instances fences are considered permitted obstructions.
A finished or unfinished area not considered a story complying with all of the following.
If there are any beams in the ceiling then these can be 6 feet 6 inches above the floor as long as they are spaced at least 4 feet apart.
Normally you need to have at least a 7 foot 6 inch ceiling height.
In residential districts the maximum height of a fence constructed along a front lot line is four feet above ground level.
Minimum 36 inch clear width for stairway.
The minimum ceiling height in rooms with sloped ceilings such as a finished attic space is 7 feet over at least 50 percent of the room area.
Maximum 7 3 4 inch stair riser height.
Specifications use the allowable stress design asd approach while others use load and resistance factor design lrfd.
The 2012 international residential code requires an attic access opening for attics with an area greater than 30 square feet and a vertical height in excess of 30 inches.
Maximum 4 1 2 inch handrail projection into stairway width on either side.
However if the attic is intended for storage the attic live load or some portion should also be considered for the design of.
Landed houses with mezzanine floors shall be designed within the permissible building envelope stipulated for the landed housing estate it is located in ie maximum 12 m overall height for a designated two storey landed housing estate and 15 5 m for a designated three storey landed housing estate.
Thus if height permitted at a particular point is 45 feet above the base plane and the actual level of the ground is five feet below it actual permitted height of a portion of a building at that point would be 50 feet.
In accordance with section r304.
The maximum height of a fence along the side or rear lot line is six feet.
