Cast_Alum_Stair_Nosing.pdf
PDF 87 KB Posted
- Attached to
- School Street Staircase Renovation
- Solicitation number
- IFB No. PW-0316
- Issued by
- Santa Cruz County, San Francisco City, California
About this file
This is a product specification document for cast aluminum safety treads and nosings required for the School Street Staircase Renovation project in California, located on North Pacific Avenue between 2017 and 2027 North Pacific Avenue. The project scope includes repair and sealing of concrete stairs, installation of cast aluminum stair nosings, and grout and tile work. The specification document details Alumogrit Type 101 safety treads and nosings manufactured by Wooster Products Inc., which are designed for both interior and exterior stair applications. The products feature anti-slip abrasive surfaces, corrosion resistance, and durability suitable for rough use environments. Standard specifications include 5/16-inch thickness, widths of 3, 4, and 6 inches, and maximum single-piece lengths of 8 feet 6 inches, with longer lengths fabricated in equal sections. The abrasive material consists of #20 virgin grain aluminum oxide integrally cast to a minimum depth of 1/32 inch.
The specification requires cast metals to conform to Alumogrit composition standards using No. 43 secondary ingot with low copper content for corrosion resistance. Fastening options include wing anchors, nuts and bolts, concealed integral anchors, screws with expansion shields, Tapcon screws, and wood screws, with concealed anchors specified as slotted rivet type integrally cast to a minimum of 3/8 inch depth. Additional requirements include shot blasted finishing, machine-made holes or countersinks, recessed screw heads, and cross-hatching or fluting at 1/16-inch minimum depth. Installation guidelines specify that nosings be placed during or immediately after concrete pouring, with safety nosings terminating not more than 4 inches from step ends for poured concrete stairs. The contractor must allow 24 hours before permitting stairway use following concrete placement and installation.
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Text version
April 2016
ABRASIVE CAST SAFETY TREADS AND NOSINGS
CAST TREADS AND NOSINGS PROVIDE:
Safe, anti slip walking surface. Protection of the step edge from damage. Visual contrast makes step edge easier to see.
FEATURES:
Maximum Durability in Rough Use Indoor or Outdoor Use Resistant to Corrosive Environment New Construction or Renovation Anti-slip Properties Ready to Install Convenience
ABRASIVE CASTINGS SPECIFICATION:
FOR POURED CONCRETE
TYPE 101
Nose 1/4" underside
Standard thickness - 5/16" Standard widths - 3",4" and 6"
DRAWING NOT TO SCALE
FASTENERS: Type 101 is available with the following types of anchors: Wing Anchors Nuts & Bolts, Concealed Integral Anchors, Screws & Expansion Shields, Tapcon Screws, Wood Screws
LENGTHS: Lengths are to order up to 8’6” maximum in one piece. Lengths over maximum will be made in equal sections
• Provide Alumogrit® type 101, size____, safety treads/ nosings as manufactured by Wooster Products Inc. for interior and exterior stairs.
• Abrasive shall be #20 virgin grain Aluminum Oxide (AL2O3) abrasive, integrally cast into the walking surface to a minimum depth of 1/32 inch.
• Safety nosings up to 6" deep with cross-hatched surface being installed into wet concrete shall have a “Feature Strip” (Trademark 3571602) along the back edge.
• Concealed type anchors shall be slotted rivet type, integrally cast into the body of the nosing a minimum of 3/8 inch. (Not mushroom type)
• Cast metals used shall conform to the following specification:
Alumogrit® (Abrasive cast aluminum): No. 43 secondary ingot; low copper content; corrosion resistant.
• Any holes or countersinks shall be machine made. Screwheads shall not protrude above tread surface.
• All cast products shall have shot blasted finish.
• Cross hatching and fluting shall be 1/16 inch deep minimum and shall be clean and well defined.
• Nosings shall terminate not more than 4" from ends of steps for poured concrete stairs; for concrete filled steel pan stairs, nosings shall be full length of steps less 1/8 inch clearance.
GUIDELINES FOR THE INSTALLATION OF METAL SAFETY TREADS OR NOSINGS INTO NEW CONCRETE OR
STEEL PAN FILLED STAIRS:
The use of very large aggregate in the concrete mix may make placement of the safety nosing difficult.
Safety nosing placement may be difficult in concrete with very low slump.
Place concrete into the stair forms or steel pans as quickly as possible; schedule pour so as to install the metal safety nosings quickly before the initial set of concrete occurs.
Puddle the concrete, tamp the safety nosings to insure proper concrete formation around the anchors.
Remove protective tape (if used) as soon as practical.
Order nosings or treads well in advance of the pour or installation date.
Close stairway after pour; permit no use for 24 hours.
WOOSTER PRODUCTS INC, 1000 SPRUCE ST., WOOSTER, OH 44691
Toll Free: 800-321-4936 Phone: 330-264-2844 Fax: 330-262-4151
Website: http://www.wooster-products.com E-mail: sales@wooster-products.com
File details come from the government source that posted it. Updated .