Vertical columns are placed 18 feet on center laterally and "as required" on center front to back.
All horizontal beams are wide flange beams.
Stringers are wide flange beams with angle rise and tread depth fabrication and are placed a maximum of 6 feet on center.
Cross braces are steel angles located as required to meet design parameters.
Entry stairs to be anchored to uniformly poured concrete bases.
Stair rise: Maximum of 7 inches with aluminum closure.
Stair tread: Minimum of 11 inches with a contrasting aluminum stair nose.
Guardrail: 42 inches above the leading edge of step with same construction as specified in the guardrails specification section below.
Handrails: Anodized handrails shall have a smooth surface with no sharp corners. The top of handrails and handrail extensions shall be no less than 34 inches or more than 38 inches above the nosing of treads and landings. Handrails shall be continuous with an un-obstructed handgrip area the full length of the stair. Handrails shall extend 12 inches beyond the bottom riser and 12 inches beyond the top riser in the direction of the stair run. Ends shall be returned or terminate in newel posts or safety terminals.
Ramps to be firmly anchored to uniformly poured concrete bases provided in accordance with Section 03300.
Slope: Maximum 1:12
Guardrail: 42 inches above the leading edge of step with the same construction as specified in the guardrails specification section below.
Handrails: Anodized extruded aluminum handrails shall have a smooth surface with no sharp corners. Top of handrails and handrail extensions shall be no less than 34 inches or more than 38 inches above the nosing of treads and landings. Handrails shall be continuous with an un-obstructed handgrip area the full length of the stair. Handrails shall extend 12 inches beyond the bottom riser and 12 inches beyond the top riser in the direction of the stair run. Ends shall be returned or terminate in newel posts or safety terminals.
Aisles
Minimum Width: 48 inches unless otherwise required by the applicable code.
Aisles with seating on both sides to have a 34 inch high handrail with intermediate rail at approximately 22 inches above tread.
Aisle tread nosing shall be of contrasting color.
Handrails: Anodized extruded aluminum handrails shall have a smooth surface with rounded ends and no sharp corners and are discontinuous to allow access to seating through a space 22 inches minimum to 36 inches maximum.
Sub-steps: If required by the applicable code, sub-steps shall be used to provide equal rise and run throughout the aisle. Each shall have aisle nosing of contrasting color and aluminum riser closure.
Seating
Each seat shall be 17 inches above its respective tread.
Option: 7 inch contoured aluminum backrest.
Risers
Size as required to fulfill the decking arrangement specified.
Guardrails
Provide at all sides of bleacher, entry stairs, ramps, portals and landings. All guardrails shall be secured to angle rail risers using galvanized fasteners. Railing shall be 42 inches above walkways and entrances. Railing shall be 42 inches above any adjacent seat. Railing shall consist of anodized aluminum pipe with cast aluminum fittings and 9 gauge galvanized chain link mesh infill
Provide at all sides of bleacher, entry stairs, ramps, portals and landings. All guardrails shall be secured to angle rail risers using galvanized fasteners. Railing shall be 42 inches above walkways and entrances. Railing shall be 42 inches above any adjacent seat. Railing shall consist of vertical picket rails in 6 foot panels. The top and bottom rail shall be 1-1/2 inch by 1/2 inch steel channels and the pickets shall be 1/2 inch square bars spaced 4 inches O.C.
Accessible Seating
Provide wheel chair spaces as required by the ADA.
Any adjacent riser area to be closed using intermediate construction.
