Residential Allowable Attic Height

Specifications use the allowable stress design asd approach while others use load and resistance factor design lrfd.

Residential allowable attic height.

In accordance with section r304. The occupiable floor area has a ceiling height in accordance with section r305 3. Room area is this case is calculated as the total floor space with walls at least 5 feet tall. Normally you need to have at least a 7 foot 6 inch ceiling height.

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. Minimum 36 inch clear width for stairway. Maximum 4 1 2 inch handrail projection into stairway width on either side. The 2018 international residential code also dictates a minimum ceiling height requirement.

The rough framed opening must be a minimum of 22 inches by 30 inches. 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. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. Minimum 6 8 headroom height clearance for stairway.

A finished or unfinished area not considered a story complying with all of the following. In most instances fences are considered permitted obstructions. Residential buildings 3 1 general. The maximum height of a fence along the side or rear lot line is six feet.

The occupiable floor area is not less than 70 sq. In residential districts the maximum height of a fence constructed along a front lot line is four feet above ground level. The rough framed opening. 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.

Maximum 7 3 4 inch stair riser height. Maximum 12 3 vertical height rise for a flight of stairs. Therefore let us recap on the residential stair code requirements.