4 100 mm min.
Stair tread nosing depth.
Unfinished red oak tread nosed return is made for interior stair construction from attractive natural oak.
A step tread is the flat horizontal surface that you walk on.
Stair tread nose curve radius 9 16 or 1 2 in some codes.
A nosing is not required where the tread depth is a minimum of 11 inches 279 mm.
For a typical staircase the stair tread must measure 8 1 4 inches to 9 inches deep measure 1 inch thick or more and have a maximum 1 1 2 inch deep nosing.
Staircase tread run depth.
So since the minimum tread size is 10 a nosing will extend the tread depth to between 10 3 4 and 11 1 4.
2 steps for stairs referred to in sentence 1 shall have a rise between successive treads not less than 125 mm and not more.
The greatest stair tread nosing projection shall not exceed the smallest nosing projection by more than 3 8 inch 9 5 mm between two stories including the nosing at the level of floors and landings.
11 280 mm min.
Styles a and b are for use on wood or concrete stairs.
The stair tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at right angle to the tread s leading edge.
The tread depth is the distance from the front edge or nosing a tread projection that overhangs the riser below of one step to the front edge or nose of the next step measured horizontally.
Treads and risers 1 except as permitted for dwelling unitsand by sentence 3 4 7 5 1 for fire escapes steps for stairs shall have a run of not less than 255 mm and not more than 355 mm between successive steps.
7 180 mm max.
The stair riser must measure 8 to 8 1 4 inches high.
Construction adhesive sold separately is for use between nosing and the front edge of the stair to prevent cracks.
Screw nosing into place to protect the front portion of the stair and provide a slip resistant surface.
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.
Attaches to the ends of plain treads to create a return tread in open stringer stair designs.
10 to 11 inches minimum.
5 13 mm max.
For wood stairs use 4 wood screws.
Beveling of nosings shall not exceed 1 2 inch 12 7 mm.
Unfinished red oak tread the surewood lnl 13 in.
Stair tread nosing stair tread nosing projection past vertical riser below 3 4 to 1 1 2 required on stairs with solid risers.
The ontario building code treads and risers 3 4 6 8.
The surewood lnl 13 in.
For concrete stairs use concrete anchors with 4 screws.
Stair tread depths shall be 11 inches 279 mm minimum.
1 5 38 mm max.
