Planning and Development Services Department

 


Building Inspection

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Building Inspection Division Hand Outs
Residential Stairway


Stair Dimensions
  • Width 36" minimum
  • Rise: 7-7/8" max.
  • Run: 10" min.
  • 3/8" max. deviation between riser heights and between tread lengths

Handrails

  • One required (two if stair is open on both sides) if there are two or more risers.
  • Height: 34" to 38" above nosing of treads.
  • Projection: 1 1/2" between handrail and wall.
  • Handrails shall be continuous the full length of the stairs. Ends shall be returned or shall terminate in newel posts or safety terminals.

 

 

 

 

 

 


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Exception: When an off set occurs, the handrail may terminate at a wall; the offset of the continuing handrail shall not exceed a distance of 6'' from center of handrail to center of handrail.



 

 

 

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Exception: Single family residential stairway handrails shall provide an area for sufficient graspability with a minimum graspable finger recess area of 5/16 inches on each side of the profile. The graspable finger recesses shall be located within a minimum distance of 3/4 inches and a maximum distance of 2 inches measured vertically from the tallest portion of the profile. The width of the rail above the recess shall be a minimum of 1-1/4 inches and a maximum of 2-3/4 inches.

Guardrails

  • Required if 30" or more above grade
  • Height: 36" at landings - handrail height at steps.
  • Openings: small enough that a 4" diameter sphere can not pass through.

ACCEPTABLE HANDRAIL SHAPES & INSTALLATIONS

 

 

 

 

Section
ALTERNATIVE STAIRWAYS

 

 

PLAN VIEW
WINDING STAIRWAY
Section R 314
PLAN VIEW
ALTERNATE USE OF WINDERS
Section R 314
LIMITATION: APPLIES TO R-3 OCCUPANCY
AND PRIVATE STAIRWAYS IN R-1 OCCUPANCY
PLAN VIEW
CIRCULAR STAIRWAY
Section R 314
PLAN VIEW
SPIRAL STAIRWAY
Section R 314

LIMITATIONS:
ONLY APPLIES TO R-3 OCCUPANCY AND PRIVATE STAIRWAYS IN R-1 OCCUPANCIES
LIMITED TO SERVING AS EXIT FOR 400 SQUARE FEET MAXIMUM

 

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