(Download PDF: Tension Structure Specification)




A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.


A. Tensioned Fabric Structure: Cable and/or frame supported tensioned membrane-covered
fabric structure; incorporating a fabric with low elongation characteristics under tension and
capable of an anticlastic configuration. Fabric structures in which fabric is applied as flat or
mono-axially curved configurations are not acceptable.


A. Section Includes:

1. Section includes a tensioned fabric canopy system as shown on Drawings and specified in
this Section.
2. Architect’s drawings indicate design intent with respect to sizes, shapes, and
configurations of the tensioned fabric canopy. Provide all components and accessories
required for complete tensioned fabric canopy system, whether or not specifically shown
or specified.
3. The tensioned fabric structure will assume bolted/pinned connections for field assembly.
No field welding will be permitted.

B. The tensioned fabric structure Subcontractor shall be responsible for the structural design,
detailing, fabrication, supply, and installation of the Work specified herein. The intent of this
specification is to establish in the first instance an undivided, single-source responsibility of
the Subcontractor for all of the foregoing functions.

C. Subcontractor’s Work shall include the structural design, supply, fabrication, shipment, and
erection of the following items:

1. The architectural membrane as indicated on the drawings and in these specifications.
2. Cables and fittings.
3. Perimeter, catenary, and sectionalized aluminum clamping system.
4. Structural steel, including masts, trusses, struts, and beams as indicated on the
5. Fasteners and gaskets.

D. Related Requirements:

1. Division 03 Section “Cast-in-Place Concrete” for concrete footings for posts of tensioned
fabric structure.
2. Division 05 Sections “Structural Steel Framing” and “Architecturally Exposed Structural
Steel” for steel structure supporting tensioned fabric structure.

E. This Project is a US Green Building Council LEEDTM – CI project:

1. Select materials to maximize use of recycled steel.
2. Select locally or regionally fabricated products wherever possible.


A. General: Except as otherwise shown or noted, all work shall comply with the requirements of
the following codes and standards:

1. American Institute of Steel Construction (AISC).

a. Specifications for the Design, Fabrication, and Erection of Structural Steel for
b. Code of Standard Practice for Steel Buildings and Bridges.
c. Specification for Structural Steel Buildings – Allowable Stress Design and Plastic
d. Specification for Allowable Stress Design of Single-angle Members.
e. Seismic Provisions for Structural Steel Buildings.

2. American Society of Civil Engineers.

a. ASCE 19: Structural Applications of Steel Cables for Buildings.

3. American Society of Testing and Materials (ASTM).

a. ASTM A586: Standard Specifications for Zinc-Coated Steel Structural Strand.
b. ASTM A603: Standard Specifications for Zinc-Coated Steel Structural Wire Rope.
c. ASTM D4851-88: Standard Test Methods for Coated and Laminated Fabrics for
Architectural Use.
d. ASTM E84: Standard Test Method for Surface Burning Characteristics of Building
e. ASTM E108: Standard Test Methods for Fire Test and Roof Coverings.
f. ASTM E136: Standard Test Method for Behavior of Materials in a Vertical Tube Furnace
at 750 degrees C.
g. ASTM C423: Standard Test Method for Sound Absorption and Sound Absorption
Coefficients by the Reverberation Room Method.
h. ASTM E424: Standard Test Method for Solar Energy Transmittance and Reflectance of
Sheet Materials.

4. American Welding Society (AWS).

a. AWS D1.1: Structural Welding Code.
b. AWS 2.4: Symbols for Welding and Nondestructive Testing.

5. Aluminum Association

a. Specifications for Aluminum Structures.

6. National Fire Protection Association (NFPA).

a. NFPA 701: Standard Methods of Fire Tests for Flame Propagation of Textiles and Films.

7. Steel Structures Painting Council (SSPC).

a. Steel Structures Painting Manual, Volumes 1 and 2.


A. General: Provide a tensioned fabric structure system that complies with requirements
specified herein by testing the Subcontractor’s corresponding membrane system in
accordance with the indicated test methods.

B. Building Code Criteria: The tensioned fabric structure shall comply with the International
Building Code, 2009 edition.

C. Comply with local building codes and respective loading criteria for Snow Loads, Live Loads,
Dead Loads, Wind Speed, and Seismic Loads.

D. Life Safety: Tensioned fabric structure shall be detailed so that no life safety issue is
created in the event of a loss of a part of the membrane. The tensioned fabric structure
shall not rely on the membrane for structural stability.


A. Product Data: For each type of product.

1. Include styles, material descriptions, construction details, fabrication details, dimensions
of individual components and profiles, hardware, fittings, mounting accessories, features,
and finishes for tensioned fabric structures.
2. Include rated capacities, light transmissions, and operating characteristics of furnished
specialties and accessories.

B. LEED Submittals:

1. Product Data for Credit MR 4: For products having recycled content, documentation
indicating percentages by weight of postconsumer and pre-consumer recycled content.
Include statement indicating cost for each product having recycled content.
2. Product Certificates for Credit MR 5.1 [and Credit MR 5.2]: For products and materials
required to comply with requirements for regionally manufactured materials. Include
statement indicating cost for each regionally manufactured material.

a. Include statement indicating location of manufacturer and distance to Project for each
regionally manufactured material.

C. Design Drawings:

1. Include plans, elevations, sections, mounting heights, and frame assembly details.
2. Preliminary member sizes with wall thickness TBD.
3. Preliminary footing layout and foundation design with final depth TBD.
4. Show intended fabric attachment hardware and details.
5. Identify direction, details and locations of fabric seams.
6. Show details of fabric membrane dimensions including length of spans, sag in curvature
and actual shaded area.

D. Engineered Drawings (submit after Design Drawings have been approved):

1. Calculations with Wet Stamp seal of a Professional Engineer with a license in the same
state as the project location.
2. Engineering Drawings with Wet Stamp seal of a Professional Engineer with a license in the
same state as the project location.
3. Include plans, elevations, sections, mounting heights, and frame assembly details.
4. Provide frame member sizes and required wall thicknesses.
5. Identify all welding requirements.
6. Detail all bolted and/or pin connections for frame assembly.
7. Identify required sizes of bolts, pins, plates and tubing.
8. Verify the fabric meets minimum engineering requirements.
9. Detail fabric attachment methods and identify thickness of all membrane plates, clamps
and other attachment components.
10. Call out all cable sizes and pretension requirements.
11. Submit anchor-bolt plans before foundation work begins. Include location, diameter, and
projection of anchor bolts required to attach the tensioned fabric structures to
foundation. Indicate column reactions at each location.

E. Samples for Initial Selection: Electronic file of available frame finish colors.

F. Samples for Verification: For the following:

1. Fabric: Qty. (4) 8 ½” x 11” samples of fabric as selected by the architect.
2. Frame Finish: Qty. (4) Sample chips, not less than 2” x 3” in size.

G. Provide a Schedule of Values within (2) weeks of project award.


A. Qualification Data: For Installer, fabricator and professional engineer.

B. Welding certificates.

C. Sample Warranty: For fabric warranty.


A. Maintenance Data: For tensioned fabric structures to include in operation and maintenance

1. Include the following:

a. Methods for maintaining tensioned fabric structure fabrics and finishes.
b. Precautions about cleaning materials and methods that could be detrimental to fabrics,
finishes, and performance.


A. Fabricator Qualifications: Shop that employs skilled workers who custom-fabricate tensioned
fabric structures similar to those required for this Project and whose products have a rec
ord of successful in-service performance.

1. Fabricator is a Master Fabric Craftsman certified by the Industrial Fabrics Association
2. Fabricator’s responsibilities include fabricating and installing tensioned fabric structures
and providing professional engineering services needed to assume engineering
3. Fabricator’s engineering services must utilize Finite Element Analysis software that
performs fabric form finding and takes into account fabric material properties and pre-
stress characteristics.
4. Fabricator must have proven record of at least (5) successful projects of similar size and
similar specified fabric material.
5. Fabricator must have been in continuous operation as a professional tensioned fabric
structure manufacturer for minimum of (10) years prior to contract.
6. Fabricator must have an in-house Made-in-America manufacturing facility for both frame
and fabric membrane components.

B. Installer Qualifications: Fabricator of products.

C. Welding Qualifications: Qualify procedures and personnel according to the following:

1. AWS D1.1/D1.1M, “Structural Welding Code – Steel.”


A. Weather Limitations: Proceed with installation only when existing and forecasted weather
conditions permit installation of tensioned fabric structure in exterior locations to be
performed according to manufacturers’ written instructions and warranty requirements.

B. Field Measurements: Where tensioned fabric structure installation is indicated to fit to other
work, verify dimensions of other work by field measurements before fabrication and indicate
measurements on Shop Drawings. Allow clearances for fenestration operation throughout the
entire operating range. Notify Architect of discrepancies. Coordinate fabrication schedule
with construction progress to avoid delaying the Work.


A. Special Warranty: Manufacturer and fabricator agree to repair or replace components of
tensioned fabric structures that fail in materials or workmanship within specified warranty
period of one year from the date of Substantial Completion.

1. Failures include, but are not limited to, the following:

a. Structural failures including framework.
b. Deterioration of fabric including seam failure.
c. Deterioration of metals, metal finishes, and other materials beyond normal weathering.

2. Warranty Period, Fabric: Reference the manufacturer’s limited warranty for the specified
fabric manufacturer and product.
3. Warranty Period, Cables, Securement Devices and Accessories: One year from date of
Substantial Completion



A. Basis-of-Design: Subject to compliance with requirements, provide the tensioned fabric
structures designed, engineered, fabricated and installed by the following:

1. Eide Industries, Inc.

a. Address: 16215 Piuma Avenue, Cerritos, California USA 90703
b. Contact: Erik Jarvie, Sales Engineer. Phone: (562) 402-8335 ext.125;
Email: erik@eideindustries.com; Website: www.tensionstructures.com

2. Or approved equal. Manufacturer must meet all minimum requirements as outlined in item
1.7 QUALITY ASSURANCE of this section and show written proof for each item listed to
become an approved equal.
3. Substitution requests must be submitted by a Prime Bidder, minimum of (10) days prior to
bid date. Any approved equals shall be issued by addendum only, prior to the bid date.

B. Source Limitations: Obtain tensioned fabric structures from single source from single


A. Regulatory Requirements: Provide tensioned fabric canopy system complying with
requirements and limitations of authorities having jurisdiction that are within Contractor’s

B. Delegated Design: Engage a qualified professional engineer to design tensioned fabric canopy
system. Delegated design engineering requirements include, but are not limited to, the

1. Prepare structural design drawings defining the precise interface geometry determination,
reaction loads imposed on structural steel framing, anchoring loads, connection details,
interfaces and seam layouts.
2. Structural calculations for the tensioned fabric canopy system shall include:

a. Large deflection numerical shape generation that will insure a stable, uniformly
stressed, three dimensionally curved shape that is in static equilibrium with the internal
pre-stress forces and is suitable to resist all applied loads.
b. Large deflection finite element method structural analysis of the membrane system
under all applicable wind and seismic loads.
c. Connection design including bolt, weld and ancillary member sizing.
d. Biaxial fabric test specification, interpretation and fabric compensation determination.
e. Accurate generation of the two dimensional compensated fabric templates required to
generate the three dimensional equilibrium shape.

C. In engineering tensioned fabric canopy system fittings and accessories to withstand
structural loads indicated, determine allowable design working stresses of railing materials
based on the following:

1. Steel: 72 percent of minimum yield strength.
2. Stainless Steel: 60 percent of minimum yield strength.
3. Aluminum: The lesser of minimum yield strength divided by 1.65 or minimum ultimate
tensile strength divided by 1.95.

D. Structural Performance: Tensioned fabric canopy system shall withstand the effects of
gravity loads and the following loads and stresses within limits and under conditions
indicated according to ASCE/SEI 7:

1. Wind Loads: To be determined by Subcontractor’s Engineer of Record.
2. Live Loads: To be determined by Subcontractor’s Engineer of Record.
3. Snow Loads: To be determined by Subcontractor’s Engineer of Record.
4. Seismic Loads: To be determined by Subcontractor’s Engineer of Record.

E. General: In engineering railings to withstand structural loads indicated, determine allowable
design working stresses of railing materials based on the following:

1. Aluminum: The lesser of minimum yield strength divided by 1.65 or minimum ultimate
tensile strength divided by 1.95.
2. Copper Alloys: 60 percent of minimum yield strength.
3. Stainless Steel: 60 percent of minimum yield strength.
4. Steel: 72 percent of minimum yield strength.

F. Thermal Movements: Allow for thermal movements from ambient and surface temperature

1. Temperature Change: 120 deg F, ambient; 180 deg F, material surfaces.

G. Control of Corrosion: Prevent galvanic action and other forms of corrosion by insulating
metals and other materials from direct contact with incompatible materials.


A. Product: Subject to compliance with requirements, provide fabric as called out and specified
by the Architect in the bid drawings.

B. Fire-Test-Response Characteristics: Provide canopy fabric with the fire-test-response
characteristics indicated, as determined by testing identical products according to test
method indicated below by UL or another testing and inspecting agency acceptable to
authorities having jurisdiction:

1. Flame-Resistance Ratings: Passes NFPA 701.

C. Fabric manufacturer: The following is a list of approved fabric manufacturers for tensioned
fabric structures.

1. Saint Gobain (Sheerfill product line)
2. Ferrari Textiles (Precontraint product line)
3. SEFAR (Tenara product line)
4. Interglass (Atex product line)
5. Seaman Corporation (Shelter-Rite product line)
6. Verseidag (Duraskin product line)
7. Naizil
8. Hiraoka
9. Mehler (Polymar product line)

D. Fabric properties:

1. Fabric thickness and tensile strength: Must meet engineering requirements with a safety
factor of five.
2. Color: White

E. Fabric Substitutions

1. High Density Polyethylene (HDPE) woven mesh fabric may be substituted for non-
waterproof applications only. HDPE fabric substitutions are only allowed when the
architectural drawings specifically call out fabric as “Shade Fabric” or “HDPE Fabric” or
“Non-waterproof Fabric” or “Fabric Mesh”.
2. Acceptable manufacturers of HDPE fabrics are Polyfab and Coolaroo.
3. Color: To be selected from the manufacturer’s range of available colors.
4. HDPE fabric membranes shall be designed to avoid contact with any PVC material.


A. General: Provide accessories as standard with tensioned fabric canopy system fabricator and
as specified. Fabricate and finish accessories at the factory to greatest extent possible, by
manufacturer’s standard procedures and processes. Comply with indicated profiles and with
dimensional and structural requirements.

B. Metal Surfaces, General: Provide materials with smooth surfaces, without seam marks, roller
marks, rolled trade names, stains, discolorations, or blemishes.

C. Frame material shall be shall be constructed of cold rolled carbon steel unless otherwise
specified by the architect in the bid drawings.

D. Steel and Iron:

1. Tubing: ASTM A 500 (cold formed) or ASTM A 513.
2. Bars: Hot-rolled, carbon steel complying with ASTM A 29/A 29M, Grade 1010.
3. Plates, Shapes, and Bars: ASTM A 36 or ASTM A 572 per engineering requirements.

E. Stainless Steel (when applicable);

1. Tubing: ASTM A 554, Grade MT 316L.
2. Pipe: ASTM A 312/A 312M, Grade TP 316L.
3. Castings: ASTM A 743/A 743M, Grade CF 8M or CF 3M.
4. Sheet, Strip, Plate, and Flat Bar: ASTM A 666, Type 316L.
5. Bars and Shapes: ASTM A 276, Type 316L.

F. Aluminum (when applicable):

1. Provide alloy and temper recommended by aluminum producer and finisher for type of use
and finish indicated, and with strength and durability properties for each aluminum form
required not less than that of alloy and temper designated below.
2. Extruded Bars and Shapes: ASTM B 221, Alloy 6063-T5/T52.

G. Cables and Fittings shall be constructed of galvanized steel unless otherwise specified by the
architect in the bid drawings:

1. All cables in contact with PTFE fabric shall be PVC coated.
2. Any cable in contact with HDPE fabric shall never have PVC coating.
3. Manufacturers: Subject to compliance with requirements, provide products by one of the
following manufacturers:

a. John A. Batchelor Co Inc.
b. Jack Rueben and Sons.
c. McMaster Carr
d. Frontier Technologies.
e. The Crosby Group.
f. Ronstan International Inc.

4. Galvanized Cables:

a. Cable: 7-by-19 galvanized steel structural wire rope made from wire complying with
ASTM A 603.
b. Cable Fittings: Connectors of types indicated or required, fabricated from hot dip
galvanized steel, and with capability to sustain, without failure, a load equal to
minimum breaking strength of cable with which they are used.

5. Stainless Steel Cables:

a. Cable: 7-by-19 wire rope made from wire complying with ASTM A 492, Type 316.
b. Cable Fittings: Connectors of types indicated or required, fabricated from stainless
steel, and with capability to sustain, without failure, a load equal to minimum breaking
strength of cable with which they are used.

H. Metal Battens for Securing Canopy Fabric to Structural Steel Frame: Extruded aluminum.

I. Frame Finish shall be polyester powder painted unless otherwise specified by the architect in
the bid drawings.

1. Powder Coat Finish:

a. Commercial blast clean surface in accordance to SSPC-SP 10.
b. Apply polyester powder coat paint to a minimum of 3 mils thick.
c. Color: As selected from manufacturer’s available stock colors.

2. Paint Finish for marine or other corrosive environments:

a. Commercial blast clean surface in accordance to SSPC-SP 10.
b. Primer Material properties – (1) coat of PPG/Ameron’s Dimecoat 9 at 2.5-4.0 mils MDFT.
c. Paint Material properties – (2) coats of PPG/Ameron’s PSX 700 at 3.0-7.0 mil MDFT per
d. Minimum thickness – 8.5-18 mils TDFT.
e. Color: As selected from manufacturer’s available stock colors.

3. Galvanizing (only if architect indicates requirement on bid drawings):

a. Comply with either ASTM A 123/A 123M or ASTM A 153/A 153M for hot-dip galvanizing,
as applicable.
b. Fill vent and drain holes that are exposed in the finished Work, unless indicated to
remain as weep holes, by plugging with zinc solder and filing off smooth.



A. Examine structural steel framing and other substrates, with Installer present, for compliance
with requirements for installation tolerances and other conditions affecting performance of
the Work.

B. Prepare written report, endorsed by Installer, listing conditions detrimental to performance.

C. Proceed with installation only after unsatisfactory conditions have been corrected.


A. Manufacturer’s Field Service: Engage a factory-authorized service representative to test and
inspect components, assemblies, and equipment installations, including connections.

B. Prepare test and inspection reports.


A. Proceed with installation of tensioned fabric structure only when existing and forecasted
weather conditions will permit work to be performed in accordance with manufacturer’s

B. Erect frame and fabric in accordance with the procedures of the approved manufacturer.

C. Adequate pre-stress shall be applied to eliminate fabric wrinkles and excess cable sag.


A. Occupancy Adjustments: When requested within 12 months from date of Substantial
Completion, provide on-site assistance in adjusting system to suit actual occupied
conditions. Provide up to one visit to Project during other-than-normal occupancy hours for
this purpose.


A. Engage a factory-authorized service representative to train Owner’s maintenance personnel
to adjust cable and fabric tension and to clean and maintain canopy fabric.