Maximum Stair Tread Depth

All treads shall be identical and the rise shall be no more than 912 inches 241 mm. Rectangular tread depths shall be 11 inches 279 mm minimum measured horizontally between the vertical planes of the foremost.

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Discrepancy is allowed The reason for the codes.

Maximum stair tread depth. Use eight 10d 0148 x. Rise Alternate step style. The IRC International Residential Code calls for a maximum rise r of 7 ¾ and a minimum run R of at least 10.

191025 b 3 Stairs have uniform riser heights and tread depths between landings. The maximum allowable stair rise is 7 34 inches and the minimum stair rise is 4 inches. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum.

Spiral stairways are permitted provided the minimum width shall be 26 inches 660 mm with each tread having a 7 12 inch 190 mm minimum tread depth at 12 inches from the narrower edge. Stair tread depths shall be 11 inches 279 mm minimum. Stair rise height is the vertical height or distance between the surface of two stair treads what you actually step on.

Receive treads and risers Throat depth1 338 min. 13975 What do riser height rise height and tread depth mean. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum.

Maintain minimum throat depth. On top or bottom end anchor bolts. Stairways shall be 600mm wide inside the stiles and it is to have a minimum clearance of 550mm between rails.

The riser height shall be measured vertically between the leading edges of adjacent treads. Width difference is 38 based on all treads 311743 Stair tread nosing must extend out ¾ to a maximum of 1 ¼ past front of riser unless the tread is 11 or larger just like above 38 max. The riser height shall be measured vertically between the nosings of adjacent treads.

At 912 rim board 534 min. Rise r 7 34. Vertical clearance above any stair tread to any overhead obstruction is at least 6 feet 8 inches 203 cm as measured from the leading edge of the tread.

At 1178 rim board 778 min. The riser height which is the distance between the leading edges of treads following each other must be a minimum of four inches and a maximum of seven inches. They use the term tread instead of run but I think thats the cause of some confusion so Ill use the standard term run IRC code limit stair.

A minimum headroom of 6 feet 6 inches 1982 mm shall be provided. 10093 Stair treads and risers. The tread depth shall be measured.

This is pretty strict so take the time to plan your stringers carefully. The tread depth can go to any maximum as long as the maximum tread in a stairway does not exceed the smallest by over 0375 inches. Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum.

Building Code 2018 of Illinois 10 Means of Egress 1011 Stairways 10115 Stair Treads and Risers 101152 Riser Height and Tread Depth JUMP TO FULL CODE CHAPTER Stair riser heights shall be 7 inches 178 mm maximum and 4 inches 102 mm minimum. Stair tread depths shall be 11 inches 279 mm minimum. The width of the landing shall not be less than the stairway width and a minimum of 600 mm clear of cross-traffic door swing or any other structure.

For recommendations on rise-run combos see the tip below. The riser height shall be measured vertically between the nosings of adjacent treads. The riser height shall be measured vertically between the leading edges of adjacent treads.

Spiral stairs must meet the vertical clearance requirements in paragraph d 3 of this section. Stair tread depths shall be 11 inches 279 mm minimum. At 14 rim board 12 max.

311742 Minimum Tread Depth is 10 max. The difference between a stairs longest and shortest riser height or stair depth should be no more than 38 inch. You should measure riser heights vertically between the leading edges of two consecutive steps.

The stair tread depth red arrow is measured from the forward edge of the step nose or edge of the step above out to the leading edge of the step being measured. 100972 Riser height and tread depth.

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