Basement Stairs Head Clearance

At least as wide as the stair width. Maximum 7-34 inch stair riser height. Minimum Head Height clearance is 78 inches.

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Stairway overall height width and headroom requirements codes are detailed here.

Basement stairs head clearance. 2 The clear height of stairways shall be measured vertically over the clear width of the stairway from a straight line tangent to the tread and landing nosings to the lowest point above and shall not be less than 2 050 mm. Minimum clear dimension for basement stairs. This may alter B or C above.

For the purpose of working out the discharge capacity under Table 22A clear width of 850mm shall be taken as 1 ½ unit width. Back side room has 12 step to floor off landing. Maximum 12-7 vertical height rise for a flight of stairs.

This shall be measured clear of any protrusion except doorknob. Consequently it doesnt have to have a code legal stairway for egress. 14 228 The maximum width of exit staircases shall be not more than 2000mm.

Minimum clear spacing between balusters. 6-8 Minimum head clearance. While I cant predict your situation exactly most bsmt stair clearance problems arise because the the bottom of the staircase is right under the main carrying beam holding up the first floor joists.

Definition of stair headroom. The one at 65 is to the plumb measurement of the nearest edge of a stair. Where a circular staircase is used as an exit staircases or access staircase in PG I II buildings the width of treads measured at the narrower end shall be not less than 100mm in residential buildings and 125mm in other buildings and at a distance of half metre from the narrower end shall be not less than 225mm in residential buildings and 250mm in other buildings.

Generally basement stairs should have clearance of 6 feet 8 inches as required by the IRC section R31172 Headroom. Minimum 10 inch stair tread depth with nosing or Minimum 11 inches with no nosing. Stairway headroom should be greater than or equal to six feet eight inches between the stair tread upper surface measured at the tread outer edge and the ceiling above.

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