Big Foot Systems
Apex Way
Hailsham
East Sussex BN27 3WA
United Kingdom
Phone: 44+ 1323 844355
Fax: 44+ 1323 848846
Email:
Web:
This Manu-Spec® utilizes the Construction Specifications Institute (CSI) Project Resource Manual (PRM),
including MasterFormat™, SectionFormat™ and PageFormat™. A Manu-Spec is a manufacturer specification using the proprietary method of specifying applicable to project specifications and master guide specifications. Optional text is indicated by brackets [ ]; delete optional text in final copy of specification. Specifier notes precede specification text; delete notes in final copy of specification. Trade/brand names with appropriate product model numbers, styles and types are used in specifier notes and in the specification text article titled “Acceptable Material.” Metric conversion, where used, is soft metric conversion.
This Manu-Spec is intended to specify safe access walkway and step systems for roofs and access to roof mounted equipment.
SECTION 07 72 46
Roof Walkways
PART 1 GENERAL
1.1 SUMMARY
A. Section Includes: This Section specifies non-penetrating recycled rubber foot with GRP grated decking and metal support frames for roof access walkways and steps.
Specifier Note: Revise paragraph below to suit project requirements. Add section numbers and titles per CSI MasterFormat and specifier’s practice.
B. Related Requirements:
Specifier Note: Include in this paragraph only those sections and documents that directly affect the work of this section. If a reader of this section could reasonably expect to find a product or component specified in this section, but it is actually specified elsewhere, then the related section number(s) should be listed in the subparagraph below. Do not include Division 00 documents or Division 01 sections, as it is assumed all technical sections are related to all project Division 00 documents and Division 01 sections to some degree. Refer to other documents with caution, as referencing them may cause them to be considered part of the contract.
1.Section [___].
1.2 REFERENCES
Specifier Note: List retained standard(s) referenced in this section alphabetically. Indicate issuing authority name, acronym, standard designation and title. Establish policy for indicating edition date of standard referenced and update as applicable. Contract Conditions Section 01 42 00 - References may be used to establish the edition date of standards. This paragraph does not require compliance with standard(s). It is a listing of all references used in this section. Only include here standards referenced in the body of the specification in PARTS 1, 2 or 3. Do not include references to building codes at any level.
A. Reference Standards:
1.ASTM International (ASTM).
a.ASTM A36 Standard Specification for Carbon Structural Steel
b.ASTM C518 Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.
c.ASTM D575 Standard Test Methods for Rubber Properties in Compression.
2.Australian Standard (AS).
a.AS 1683.12 Rubber, vulcanized or thermoplastic - Determination of tear strength (trouser, angle and crescent test pieces).
b.
AS 1683.15 Methods of test for elastomers - Method 15.1 International rubber hardness.
c.
AS 2498.6 Methods of testing rigid cellular plastics - Determination of dimensional stability.
3.British Standards Institute (BS).
a.BS 7188 Methods of Test for Impact Absorbing Playground Surfaces.
b.BS 4592 Industrial Type Flooring and Stair Treads. Part 6. Glass reinforced plastics (GRP) Moulded Open mesh Gratings: Specification.
c.BS 10219 Cold formed welded structural hollow sections of non-alloy and fine grain steels
4.International Organization for Standardization (ISO).
a.ISO 845 Cellular Plastics and Rubbers - Determination of Apparent Density.
b.ISO 1461 Hot dip galvanized coatings on fabricated iron and steel articles.
c.ISO 15614-1 Specification and qualification of welding procedures for metallic materials -- Welding procedure test.
d.ISO 1827 Rubber, Vulcanized or Thermoplastic - Determination of Shear Modulus and Adhesion to Rigid Plates - Quadruple-Shear Methods.
5.US Green Building Council (USGBC).
a.LEED V4 LEED (Leadership in Energy and Environmental Design): Green Building Rating System Reference Guide for Building Design and Construction.
Specifier Note: Article below includes submittal of relevant data to be furnished by Contractor before, during or after construction. Coordinate this article with Architect’s and Contractor’s duties and responsibilities in Contract Conditions and Section 01 33 00 - Submittal Procedures.
1.3 SUBMITTALS
A. Make submittals in accordance with [Section 01 33 00 - Submittal Procedures].
B. Product Data: Indicate sizes, profiles, surface finishes, configuration and include:
1.Performance criteria.
2.Manufacturer’s Spec-Data product sheets.
3.Safety Data Sheets (SDS).
C. Shop Drawings: Include dimensions, configurations and recommended spacing for loads.
1.Show changes of elevation and required clearances.
2.Include system layout drawings clearly showing manufacturer’s model numbers and locations of each unit.
3.Include connector details.
4.Show anchorage where appropriate.
D. Test Reports: Certified test reports showing compliance with specified performance characteristics and physical properties.
E. Certificates: Product certificates signed by manufacturer certifying materials comply with specified performance characteristics and criteria and physical requirements.
F. Manufacturer’s Field Reports: Submit manufacturer’s field reports within 3 days of each manufacturer representative’s site visit and inspection.
Specifier Note: Coordinate Article below with Contract Conditions and with Section 01 78 36 - Warranties.
G. Installer’s Experience: Submit verification of evidence of work similar to the work of this section.
H. Warranty: Fully executed, issued in [Owner’s] name and registered with manufacturer, including:
1.Manufacturer’s [1-year] warranty covering defects in materials from date of substantial completion.
Specifier Note: Retain the following only if specifying for a LEED project. Specify only the technical submittal requirements necessary to achieve the credits desired for this project.
I. Sustainable Design (LEED) Submittals:
1.LEED Submittals: In accordance with Section [01 35 21 – LEED Requirements].
2.Submit verification for items when appropriate as follows:
a.MR4.1 for recycled content of 10% minimum.
b.MR4.2 for recycled content of 20% minimum.
1.4 CLOSEOUT SUBMITTALS
A. Maintenance Data: Manufacturer’s instructions on care and cleaning of resilient athletic flooring.
1.5 QUALITY ASSURANCE
A. Installer: Experienced in performing work similar to work of this section.
1.6 DELIVERY, STORAGE & HANDLING
A. Deliver store and handle materials in accordance with manufacturer’s written instructions.
1.Deliver materials in manufacturer’s original, unopened, undamaged containers with identification labels intact and product name and manufacturer clearly visible, and in sizes to suit project.
B. Store materials protected from exposure to harmful environmental conditions, clean, dry, frost-free and at recommended temperature and humidity levels.
1.7 Field Conditions
A. Do not install in locations where temperature may be less than minus 40 degrees F.
1.8 WARRANTY
A. Project Warranty: Refer to Contract Conditions for project warranty provisions.
B. Manufacturer’s warranty: Submit, for owner’s acceptance, manufacturer’s standard warranty document executed by authorized company official.
1.Manufacturer’s warranty is in addition to and not intended to limit other rights owner may have under Contract Conditions.
PART 2 PRODUCTS
Specifier Note: Add product attributes performance characteristics, material standards and descriptions in other articles as applicable. Use of such phrases as “or equal,” “approved equal” or similar phrases may cause ambiguity in specifications. Such phrases require verification (procedural, legal and regulatory) and assignment of responsibility for determining “or equal” products.
2.1 MANUFACTURER
A. Big Foot Systems; Apex Way, Hailsham, East Sussex, BN27 3WA, United Kingdom; Phone: 44+ 1323 844355; Fax: 44+ 1323 848846; Email: ; Email for Technical Assistance: ; Website:
2.2 Description
A. Roof access walkway system with non-penetrating recycled rubber foot, GRP grated decking and metal support frames [with handrails].
Specifier Note: Edit the following article to suit project requirements and Big Foot Safe Access walkway system specified.
2.3 SYSTEM COMPONENTS
A. Rubber Foot: To BS 7188.
1.Density: 650 1020 kg m3 to ISO 845.
2.Compressive strength: 1.2 MPa to ASTM D575.
3.Compression Young’s modulus: 0.26 MPa to ASTM D575.
4.Dimensional stability: < 1 mm to AS 2498.6.
5.Heat conductivity: 0.1906 W/mk to ASTM D575.
6.Heat resistance: 0.1283 m2K/W to ASTM C518.
7.Shear strength: 2.56 MPa to ISO 1827.
8.Shore hardness: 60 - 70 to AS 1683.15.
B. Frame: [169 lbs/ ft3 corrosion resistant aluminum channels and tubes] [lbs/ ft3 galvanized steel channels and bars to ASTM A36].
1.Configuration: To meet walkway system specified and as indicated.
C. Decking: [GRP Grating to BS 4592-6] [Galvanized metal grating] sized to suit walkway system specified and capable of supporting specified design loads.
1.Size: To suit walkway system specified and as indicated.
Specifier Note: Handrails are optional. Check with local building authorities to determine maximum height and location allowable for walkways without handrails. Include the following paragraph for all situations that require handrails. Delete the following paragraph if handrails are not required.
D. Handrails: Galvanized steel to ASTM A36 in sizes to suit walkway system specified.
Specifier Note: The following three Articles can be used individually or in combination. The design of individual buildings and the location of equipment, plant and other roofing perturbances mean that any safe rooftop pathway or access system will vary greatly from building to building. There are standard components available that can be used together to make just about any access pathway and platform system imaginable. Contact Big Foot Systems directly for the best advice on which components will best meet the project requirements and building and equipment configurations.
Specifier Note: Retain and edit the following Article when a simple horizontal single level roof access pathway system is required. For multi-level systems, or for changes in elevation, this system can be used in combination with the “Step and Stairway Systems” shown below.
2.4 HORIZONTAL WALKWAY SYSTEMS
Specifier Note: If more than one model of Big Foot Systems Rapid Walkway is required, repeat the relevant Paragraphs for each model.
A. Walkway Model # [1].
1.Walkway Foot: Black UV Stabilized recycled rubber crumb.
Specifier Note: For Big Foot Systems, B9105 Walkway choose 2 feet. For Big Foot Systems, B9106 Walkway choose 3 feet. For Big Foot Systems, B9107 Walkway choose 4 feet. Walkway system may be a combination of one or more of the specified units. Indicate on drawings where each unit is to be installed.
a.Number of feet per unit: [2] [3] [4].
b.Minimum distance between feet: 19 1/8 inches.
c.Foot size: To suit specified walkway system maximum design load.
Specifier Note: For Rapid Walkway Model B9105 Walkway, choose a walkway size of 39 3/8 x 39 3/8 x 4 ¾ inches. For Rapid Walkway Model B9106 Walkway, choose a walkway size of 78 1/8 x 39 3/8 x 4 ¾ inches. For Rapid Walkway Model B9106 Walkway, choose a walkway size of 118 ½ x 39 3/8 x 4 ¾ inches.
2.Walkway Size: [39 3/8 x 39 3/8 x 4 ¾] [78 1/8 x 39 3/8 x 4 ¾] [118 1/2 x 39 3/8 x 4 ¾] inches.
3.Walkway Decking: [GRP grating] [Galvanized metal grating] capable of supporting specified design loads.
Specifier Note: Design load is based upon the maximum allowable deflection on cross members. Allowable foot pressure is subject to the roof design. Edit the following paragraph to meet project requirements. Specify maximum loading for each Big Foot Walkway System. Contact the manufacturer directly for maximum design loads for each Rapid Walkway Model and for any customized sections indicated on drawings.
4.Design Load: In accordance with manufacturer’s written recommendations.
Specifier Note: For Rapid Walkway Model B9105 Walkway, choose a weight of 71 lbs. For Rapid Walkway Model B9106 Walkway, choose a weight of 119 lbs. For Rapid Walkway Model B9106 Walkway, choose a weight of 170 lbs.
5.Weight per Unit (excluding handrails): [71] [119] [170] lbs.
Specifier Note: Specify the number of each type of horizontal walkway unit required. Delete the following Paragraph if only one horizontal walkway unit is required.
6.Number of units: [2] [As indicated].
B. Acceptable Material: Big Foot Systems, Safe Access Rapid Walkway Model [B9105] [B9106] [B9107] Walkway [with handrails].
Specifier Note: Retain and edit the following Article when a more complex roof horizontal walkway system is required around rooftop mounted equipment and plant. For multi-level systems, or for changes in elevation, this system can be used in combination with the “Step and Stairway Systems” shown below.
2.5 PLANT AND EQUIPMENT WALKWAY SYSTEMS
Specifier Note: If more than one model of Big Foot Systems Safe Access Plant Deck Frame is required, repeat the relevant Paragraphs for each model.
A. Plant Deck Frame Model # [1].
1.Walkway Foot: Black UV Stabilized recycled rubber crumb with 30% glass-fiber reinforced nylon.
Specifier Note: For Big Foot Systems, Plant Deck Model B4040 Walkway specify 6 feet. For Big Foot Systems, Plant Deck Model B4060 Walkway specify 8 feet. For Big Foot Systems, Plant Deck Model B4080 Walkway specify 10 feet. Walkway system may be a combination of one or more of the specified units. Indicate on drawings where each unit is to be installed.
a.Number of feet per unit: [6] [8] [10].
b.Minimum distance between feet: 19 1/8 inches
c.Foot size: [12 inches for each walkway model] [7.87 inches for each platform model].
2.Walkway Size:
Specifier Note: For Plant Deck Model B4040, choose an overall length of 95 7/8 inches. For Plant Deck Model B4060, choose an overall length of 135 ¼ inches. For Plant Deck Model B4080, choose an overall length of 174 5/8 inches.
a.Overall length: [95 7/8] [135 ¼ ] [174 5/8] inches.
b.Overall width: 135 13/16 inches.
c.Height: 14 15/16 inches minimum, 18 7/8 inches maximum.
3.Walkway Decking: [GRP grating] [Galvanized metal grating] capable of supporting specified design loads.
Specifier Note: Design load is based upon the maximum allowable deflection on cross members. Allowable foot pressure is subject to the roof design. Edit the following paragraph to meet project requirements. Specify maximum loading for each Big Foot Systems. For Plant Deck Model B4040, choose a design load of 3,527 lbs. For Plant Deck Model B4060, choose a design load of 5,291 lbs. For Plant Deck Model B4080, choose a design load of 7,055 lbs.
4.Design Load: [3527] [5291] [7055] lbs maximum.
Specifier Note: For Plant Deck Model B4040, choose a frame weight of 507 lbs. For Plant Deck Model B4060, choose a frame weight of 705 lbs. For Plant Deck Model B4080, choose a frame weight of 904 lbs.
5.Frame Weight per Walkway Model (excluding handrails): [507] [705] [904] lbs.
Specifier Note: Specify the number of each type of plant deck frame walkway unit required. Delete the following paragraph if only one safe access plant deck frame model is required.
6.Number of units: [2] [As indicated].
B. Acceptable Material: Big Foot Systems, Safe Access Plant Deck Frame Model [B4040] [B4060] [B4080] Walkway [with handrails].
Specifier Note: Although there are standard components for Step and Stair Walkway Systems, the variations in building, equipment and plant design and configuration mean that almost every system is to some extent a customization of standard parts and models. Each rooftop walkway and safe access system must be considered individually to best meet the project requirements. Below is an example of specifying some custom Step and Stair Walkway Systems; however each project should be considered individually and specifically.
Specifier Note: Retain and edit the following Article when changes in elevation of a walkway and platform system is required around and over various pieces of equipment, plant and other rooftop perturbances. Use the Article in combination with Horizontal Walkway Systems and Plant and Equipment Walkway Systems shown above.
2.6 STEP AND STAIRWAY WALKWAY SYSTEMS
Specifier Note: If more than one model of Big Foot Systems Safe Access Step Over or Platform is required, repeat the relevant Paragraphs for each model.
A. Step Over Model # [1].
B. Custom system consisting of walkway feet, support frames, decking, stairs and stair treads, and platforms.
C. Components:
1.Step tread and decking: [GRP grating] [Galvanized metal grating] capable of supporting specified design loads.
a.Step width: 58.7 inches.
b.Step length: [67.4] [87.1] [106.9] inches.
Specifier Note: Retain and edit the following Paragraph if steps are required. For Model B6939 2 Step choose a clearance height of 22 inches. For Model B6940 3 Step choose a clearance height of 30.7 inches. For Model B6941 4 Step choose a clearance height of 39.3 inches. Contact Big Foot Systems directly for other step configurations and clearance heights.
c.Step Clearance Height: [22] [30.7] [39.3] inches.
2.Step Foot: Black UV Stabilized recycled rubber crumb with 30% glass-fiber reinforced nylon.
a.Number of feet per step: [As indicated] and to meet specified design loads.
b.Foot size for each step model: 12 inches.
Specifier Note: Design load is based upon the maximum allowable deflection on cross members. Allowable foot pressure is subject to the roof design.
3.Step design load: [As indicated].
Specifier Note: Specify the number of each type of “step over” units required. Delete the following Paragraph if only one “step over” unit is required.
4.Number of units: [2] [As indicated].
Specifier Note: Contact Big Foot Systems directly for other step configurations.
5.Acceptable material for steps: Big Foot Systems. Model [B6939 2] [B6940 3] [B6941 4] Step Over [with handrails].
D. Platform Components:
1.Step decking: [GRP grating] [Galvanized metal grating] capable of supporting specified design loads.
a.Platform width: [23.6] [39.3] inches.
b.Platform length: 39.3 inches.
Specifier Note: Retain and edit the following Paragraph if platforms are required. Use the following Paragraph if a 6.1 inch platform clearance is required.
c.Platform Model Clearance Height: 6.1 inches.
2.Platform Foot: Black UV Stabilized recycled rubber crumb with 30% glass-fiber reinforced nylon.
a.Number of feet per step: [As indicated] and to meet specified design loads.
b.Foot size for each platform model: 7.87 inches.
Specifier Note: Design load is based upon the maximum allowable deflection on cross members. Allowable foot pressure is subject to the roof design.
3.Platform design load: [As indicated].
Specifier Note: Specify the number of each type of “step over” units required. Delete the following Paragraph if only one platform is required.
4.Number of platforms: [2] [As indicated].
Specifier Note: Contact Big Foot Systems directly for other platform configurations.
5.Acceptable material for platforms: Big Foot Systems. Model [B9200 600] [B9200 1000] Platform.
2.7 ACCESSORIES
Specifier Note: Handrails are optional. Check with local building authorities to determine maximum height and location allowable for walkways above the roof deck before handrails are required. Delete the following paragraph if handrails are not required. Retain and edit the following Paragraph if handrails are required to meet project requirements and local authorities having jurisdiction.