PRECAST CONCRETE STAIR TREADS
Copyright 2008 - 2015 ARCAT, Inc. - All rights reserved
** NOTE TO SPECIFIER ** Camp Logan Cement Works, Inc.; Precast Concrete Stair Treads.
This section is based on the products of Camp Logan Cement Works, Inc., which is located at:
1212 Asbury St.
Houston, TX 77007-3194
Camp Logan Cement Works, Inc. is one of the largest producers of precast concrete step treads in the United States. Our precast cement steps fit both wood and steel stringers. We offer bolt-on and weld-on precast step treads. We have been producing precast treads for over forty years. We have shipped our precast treads all over the United States. We have production facilities in Houston, Texas, and Pearland, Texas. We keep plenty of precast cement steps in stock. Let Camp Logan Cement Works quote your next job.
Precast Concrete Stair Treads.
** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
Section 03300 - Cast-In-Place Concrete: Adjacent bases, footings, foundations and slabs.
Section 05510 - Metal Stairs: Stringers to receive treads specified in this section.
Section 05520 - Handrails and Railings: Adjacent railings attached or adjacent to Work specified in this section.
Section 05550 - Stair Treads and Nosings: Metal tread nosings.
** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
ASTM A 615 - Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement.
ASTM C 67 - Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile.
ASTM C 136 - Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates.
ASTM C 293 - Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading).
ASTM F 1554 - Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength.
Federal Specification - FS TT-P-641, Type II - Paints, Coatings and Preservatives.
The Society for Protective Coatings:
SSPC-PA 1 - Shop, Field, and Maintenance Painting of Steel
Structural Performance: Provide precast stair treads capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated:
Live Load: 100 lbs. (45.4 kg) per square foot.
Concentrated Load: _____ lbs (___ kg) applied to a 4 square inch (25.8 sq.cm.) area.
Maximum Deflection: L/240 or 1/4 inch (6mm), whichever is less.
Maximum Deflection: L/360 or 1/4 inch (6mm), whichever is less.
** NOTE TO SPECIFIER ** Retain the next paragraph only if the project requires seismic design and has been determined by a P.E. within the jurisdiction of the project..
Seismic Performance: Provide metal stairs capable of withstanding the effects of earthquake motions determined according to ASCE 7, "Minimum Design Loads for Buildings and Other Structures": Section 9, "Earthquake Loads."
** NOTE TO SPECIFIER ** Insert pre-determined Seismic Use Group based on building usage.
** NOTE TO SPECIFIER ** Insert pre-determined Seismic Category based on building location.
Submit under provisions of Section 01300.
Product Data: Manufacturer's data sheets on each product to be used, including:
Preparation instructions and recommendations.
Storage and handling requirements and recommendations.
Shop Drawings: Submit plan, section, elevation and perspective drawings as necessary to determine the required dimensions and placement location for each product specified as well as clarify the manufacturer's recommended installation, joinery and termination techniques.
** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected.
Selection Samples: For each finish product specified, two samples representing manufacturer's full range of available colors and finishes.
Verification Samples: At the pre-construction meeting, provide two full size samples representing each specified product, showing color, finish. Sample may be used within the Work specified in this section, provided no damage has occurred to it prior to or during installation.
Include structural analysis data signed and sealed by the qualified professional engineer (P.E.) responsible for their preparation.
Manufacturer Qualifications: All primary products specified in this section will be supplied by a single manufacturer with a minimum of ten (10) years experience.
Installer Qualifications: All products listed in this section are to be installed by a single installer with a minimum of five (5) years demonstrated experience in installing products of the same type and scope as specified.
** NOTE TO SPECIFIER ** Include a mock-up if the project size and/or quality warrant taking such a precaution. The following is one example of how a mock-up on a large project might be specified. When deciding on the extent of the mock-up, consider all the major different types of work on the project.
Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and application workmanship.
Finish areas designated by Architect.
Do not proceed with remaining work until workmanship, color, and sheen are approved by Architect.
Refinish mock-up area as required to produce acceptable work.
DELIVERY, STORAGE, AND HANDLING
Transport, store and handle precast concrete stair treads in accordance with manufacturers written instructions.
Store precast concrete stair treads on pallets clear of mud and water. Stack precast concrete stair treads to allow air to circulate freely and keep treads dry.
Do not allow cast in anchor bolts to be damaged during handling or to rust during storage.
Transport and store stair treads so that edges and corners of treads are not damaged.
Store and dispose of hazardous materials, and materials contaminated by hazardous materials, in accordance with requirements of local authorities having jurisdiction.
Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.
At project closeout, provide to Owner or Owners Representative an executed copy of the manufacturer's standard limited warranty against manufacturing defect, outlining its terms, conditions, and exclusions from coverage.
Duration: One (1) year from date of substantial completion.
Acceptable Manufacturer: Camp Logan Cement Works, Inc., which is located at: 1212 Asbury St.; Houston, TX 77007-3194; Toll Free Tel: 800-445-9062; Tel: 713-869-3385; Fax: 713-869-3362; Email: request info (email@example.com); Web: www.camplogancement.com
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
Substitutions: Not permitted.
Requests for substitutions will be considered in accordance with provisions of Section 01600.
Concrete: Comply with requirements in Division 3 Section "Cast-in-Place Concrete" for normal-weight, ready-mixed concrete with a minimum 28-day compressive strength of 5000 psi (34.5 MPa) and a total air content of not less than 4 percent or more than 6 percent.
Flexural Strength: 2500 to 3000 psi (17.25 - 20.7 MPa) in accordance with ASTM C 293.
Water Absorption: 3 to 4 percent absorption in accordance with ASTM C 67.
Aggregate: Report sieve analysis in accordance with ASTM C 136.
Reinforcing Bars: #3 - 3/8 inch (10mm) deformed rebar meeting the requirements of ASTM A 615, Grade 40.
** NOTE TO SPECIFIER ** Consider epoxy coated rebar in colder climates, or delete below.
Provide manufacturer's standard epoxy coating on reinforcing bars.
Embedded Stair Tread Anchor Bolts: ASTM F 1554, Grade 36.
Provide hot-dip or mechanically deposited, zinc-coated anchor bolts with nuts for attaching and securing stair treads to stair framing.
Stair tread manufacturer's standard "shoulder nut" anchor bolt design to resist damage due to excessive torque stress on anchor bolt nut, or normal stair movement.
** NOTE TO SPECIFIER ** The following nine tread dimensions are standard offerings. Retain only those required and delete all others.
Tread Length: 36 inches (914mm).
Tread Length: 39 1/2 inches (1003mm).
Tread Length: 41 inches (1041mm).
Tread Length: 42 inches (1067mm).
Tread Length: 44 inches (1118mm).
Tread Length: 47 inches (1194mm).
Tread Length: 48 inches (1219mm).
** NOTE TO SPECIFIER ** The following 10 tread dimensions are non-standard offerings. Retain only those required and delete all others.
Tread Length: 27 inches (686mm).
Tread Length: 30 inches (762mm).
Tread Length: 32 inches (813mm).
Tread Length: 33 inches (838mm).
Tread Length: 34 inches (864mm).
Tread Length: 45 1/2 inches (1156mm).
Tread Length: 49 inches (1245mm).
Tread Length: 53 1/2 inches (1359mm).
Tread Length: 55 inches (1397mm).
Tread Length: 60 inches (1524mm).
** NOTE TO SPECIFIER ** Select tread width. Delete one of the next two paragraphs.
Tread Width: 11 inches (279mm).
Tread Width: 12 inches (305mm).
** NOTE TO SPECIFIER ** Select tread thickness. Delete one of the next two paragraphs.
Tread Thickness: 2 1/4 inches (57mm).
Tread Thickness: 3 inches (76mm).
** NOTE TO SPECIFIER ** Select tread profile. Delete one of the next two paragraphs.
Tread Profile/Edge: Standard, 87 degree angle with a 3/8 inch (10mm) eased edge. Leading face extends down 2 1/4 inches (57mm) from tread surface.
** NOTE TO SPECIFIER ** The following profile is only available in the following lengths: 36 inches, 39-1/2 inches, 41 inches, 42 inches, 44 inches, 48 inches. Delete if not required.
Tread Profile/Edge: Lip Profile, 87 degree angle with a 3/8 inch (10mm) eased edge. Leading face extends down 3 3/8 inches (86mm) from tread surface.
GALVANIZED STEEL FlNlSHES
Surface Preparation: Clean and prepare surfaces to be painted according to manufacturer's written instructions for each particular substrate condition and as specified.
Factory Priming for Field-Painted Finish: Where field painting after installation is indicated, apply the air-dried primer specified below immediately after cleaning and pre-treating.
Shop Primer: Zinc-dust, zinc-oxide primer complying with performance requirements in FS TT-P-641, Type II.
PRECAST CONCRETE TREAD FINISHES
Surfacing: Light to medium broom finish with a 2 inch (51mm) edging.
Tool stair tread exposed edges to form a 3/8 inch (10mm) radius.
Examine substrates and conditions for compliance with requirements for, installation tolerances and other conditions affecting performance of work.
If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.
Proceed with installation only after unsatisfactory conditions have been corrected.
Clean surfaces thoroughly prior to installation.
Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.
Cutting, Fitting, and Installation: Perform cutting, drilling, and fitting required for installing precast concrete stair treads. Set units accurately in location, alignment, and elevation, measured from established lines and levels.
** NOTE TO SPECIFIER ** Select specified method of attachment for precast stair treads to metal stair framing. Delete one of the next two paragraphs.
Fastening to Metal Stairs: Provide anchorage devices and embedded threaded fasteners as indicated on approved submittals for securing precast concrete treads to metal stairs.
Fastening to Metal Stairs: Install precast stair treads to metal stairs by welding to stair framing anchorage devices as indicated on approved submittals.
** NOTE TO SPECIFIER ** Retain the paragraph below only if welded installation of precast concrete stair treads is selected in paragraph above.
Field Welding: Comply with the following requirements:
Use materials and methods that minimize distortion and develop strength and corrosion resistance of base metals.
Obtain fusion without undercut or overlap.
Remove welding flux immediately.
At exposed connections, finish exposed welds and surfaces smooth and blended so no roughness shows after finishing and contour of welded surface matches that of adjacent surface.
** NOTE TO SPECIFIER ** Retain the next paragraph only if touchup painting is included in this Section.
Touchup Painting: Immediately after erection, clean field welds, bolted connections, and abraded areas of shop paint, and paint exposed areas with the same material as used for shop painting to comply with SSPC-PA 1 for touching up shop-painted surfaces.
Apply by brush or spray to provide a minimum 2.0 mil (0.5mm) dry film thickness.
** NOTE TO SPECIFIER ** Retain the next paragraph if finishes are specified in Division 09910 - Paint.
Touchup Painting: Cleaning and touchup painting of field welds, bolted connections, and abraded areas of shop paint are specified in Section 09910 - Paint.
Appearance of Finished Work: Variations in appearance of abutting or adjacent pieces are acceptable if they are within one-half of the range of approved Samples. Noticeable variations in the same piece are not acceptable.
Protect installed products until completion of project.
Protect finishes on exposed surfaces from damage during manufacture and installation.
Touch-up, repair or replace damaged products before Substantial Completion.
END OF SECTION