Tensioned Fabric Shade Structures

SECTION 13 31 23 – TENSIONED FABRIC SHADE STRUCTURES
[Version 1.0 · Draft for Architect/Specifier Review · Upholsterers United (UU) Network Guide Specification]

Editor's note to the specifier: This is a three-part CSI guide specification for shop-fabricated, structurally engineered, and field-erected tensioned fabric shade structures — shade sails, fabric canopies, and small-to-mid-scale tensioned-membrane structures on a steel or aluminum frame — fabricated and installed by a current Upholsterers United (UU) Registered Shop in the Tensioned Fabric Structures trade category. This Section is scoped to shade sails, canopies, walkway and courtyard covers, and comparable tensioned-fabric structures; it is not intended for monumental stadium-scale tensile roof structures, which typically require a project-specific specialty engineer of record beyond the scope of a network guide specification. As with the companion Sections in this series (12 22 00, 12 48 00, 12 52 00), the fabricator is qualified by current network registration, verifiable by any bidder and confirmable by the Architect at upholsterersunited.com at time of bid, rather than named as a sole basis-of-design source with a formal substitution-petition process. This Section requires delegated structural design sealed by a professional engineer licensed in the state where the Project is located; the Architect/specifier should coordinate this requirement with the Project's structural engineer of record and confirm whether the Project's delegated-design procedures (submittal routing, review responsibility) require modification of the language in Paragraph 1.4.B. Choose or delete each bracketed option [like this], renumber as needed, and insert project-specific values (design wind speed/exposure, snow load, fabric type, factor of safety) before issuing for bid. Items marked [verify] cite a real standard or code section but a figure, edition, or threshold the specifier must confirm before issuing.

PART 1 – GENERAL

1.1 SUMMARY
A. This Section includes delegated structural design, shop fabrication, supply, and field erection and tensioning of:
1. Tensioned fabric shade sails and canopies on steel or aluminum posts, masts, or frames.
2. [Fixed][retractable/seasonal] fabric canopies and walkway or courtyard covers.
3. [Fabric awnings attached directly to a building face, where fabricated by the same Fabricator and not specified under a separate awning section][Not Used].
4. Structural steel or aluminum frame members, compression rings, posts, baseplates, edge cable, and rigging hardware required to tension and support the fabric membrane.
5. Delegated structural calculations and sealed shop drawings for the complete structure, including anchorage to the foundation furnished under Division 03.
B. This Section excludes concrete footings and foundations (Division 03, designed to the reactions furnished by this Section's structural engineer), host-building structural steel to which the structure may attach (Division 05), roof or wall penetration flashing and waterproofing (Division 07), electrical power to any integrated lighting (Division 26, except low-voltage control/lighting cable furnished and terminated by the Fabricator where scheduled), and large-scale, building-integrated permanent membrane roof structures requiring a project-specific specialty tensile-structure engineer of record beyond this Section's scope.
C. Single-source responsibility: one UU Registered Shop (the "Fabricator") shall be responsible for structural design coordination, fabrication, and erection of the complete structure under this Section, whether the structural engineering is performed in-house or by the Fabricator's retained engineering consultant.

1.2 RELATED SECTIONS
A. Division 03 – Concrete (footings and foundations receiving this Section's anchorage).
B. Division 05 – Metals (host-building structural steel, where the structure attaches to an existing building frame).
C. Division 07 – Thermal and Moisture Protection (flashing/waterproofing at any roof or wall penetration).
D. Division 12 – Section 12 52 00 Custom Upholstery (adjacent UU trade category; some UU Registered Shops perform both).
E. Division 26 – Electrical (line-voltage power to integrated lighting, where scheduled).

1.3 REFERENCES
A. ASCE/SEI 7, Minimum Design Loads and Associated Criteria for Buildings and Other Structures, the edition referenced by the IBC edition adopted by the AHJ. Governs wind, snow, seismic, and live/dead load criteria for the structure's design. [Verify edition — ASCE 7-16 is referenced by the 2018 and 2021 IBC and ASCE 7-22 by the 2024 IBC cycle; confirm which edition the AHJ has adopted.]
B. ASCE/SEI 55, Tensile Membrane Structures (current edition ASCE/SEI 55-16). Sets minimum requirements for the analysis, design, and performance evaluation of membrane-covered structures using cables or rigid supporting members, covering both permanent and temporary, free-standing or building-attached structures, and providing both LRFD and ASD load combinations specific to membrane behavior (as distinct from the generic combinations in ASCE 7 alone). [Confirmed scope via ICC/ASCE standard listing; verify the current edition in effect and whether the AHJ or the Project's structural engineer of record requires its use in addition to ASCE 7.]
C. AISC 360, Specification for Structural Steel Buildings. Governs design of steel frame members, posts, compression rings, and bolted/welded connections.
D. AWS D1.1/D1.1M, Structural Welding Code – Steel, governing field and shop welding of steel frame connections; AWS D1.2/D1.2M, Structural Welding Code – Aluminum, where aluminum frame members are scheduled. Welding shall be performed only by welders currently qualified under the applicable code.
E. ASTM D4851, Standard Test Methods for Coated and Laminated Fabrics for Architectural Use. The primary test-method standard for PVC-coated polyester and PTFE-coated fiberglass architectural membrane fabric, covering breaking strength, tear strength, seam strength, hydrostatic resistance, weight, thickness, and coating adhesion. [Confirmed title/scope via ASTM's published standard listing; verify current edition.]
F. ASTM D751, Standard Test Methods for Coated Fabrics, commonly referenced as an alternate or companion standard for coated-fabric breaking strength, tear, low-temperature bend, and blocking resistance, depending on how the specific fabric manufacturer reports test data. [Verify which designation — D4851 or D751 — the scheduled fabric manufacturer's published data is reported under.]
G. ASTM D4355, Standard Test Method for Deterioration of Geotextiles from Exposure to Ultraviolet Light and Water (Xenon-Arc Type Apparatus), used industry-wide to evaluate retained tensile strength of synthetic fabrics, including knitted shade cloth, after accelerated UV/weathering exposure; the underlying xenon-arc exposure apparatus and general procedure is governed by ASTM G155, Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials. [Verify current edition of each and whether the scheduled fabric's manufacturer reports retained-strength data under D4355 specifically or under a proprietary accelerated-weathering protocol.]
H. NFPA 701, Standard Methods of Fire Tests for Flame Propagation of Textiles and Films. Test Method 2 (heavyweight, coated, or expanded-vinyl-type materials) is generally the applicable method for coated architectural membrane and shade fabric. [Verify current edition's test-method assignment and pass criteria for the specific fabric weight/construction scheduled.]
I. IBC Chapter 31 (Special Construction), Section 3102, "Membrane Structures." Governs permanent air-inflated, air-supported, and tensioned-membrane structures, including construction classification, allowable area, engineering design requirements, and the fabric flame-propagation requirement: Section 3102.3.1 requires the membrane and any interior liner to be either noncombustible per IBC Section 703.4 or to meet NFPA 701's fire-propagation performance together with the manufacturer's test protocol, giving a passing NFPA 701 result as an accepted alternative path to compliance. [Confirmed section-level structure and the NFPA 701-as-alternative framework via a secondary summary of the IBC text (specialtyfabricsreview.com); verify current section numbering against the specific IBC edition and any state amendment adopted by the AHJ, and confirm with the AHJ whether small, open-sided shade structures below a stated area or occupancy threshold are exempt from Chapter 31's scope on this project.]
J. IFC Chapter 24, "Tents, Membrane Structures and Temporary Special Event Structures," governing temporary structures (180 days or less), including the Section 2404.2 requirement for a testing-laboratory certificate confirming the membrane is flame-resistant — inherently or by an approved flame-retardant treatment — and meets NFPA 701, valid for the duration of the permit. [Confirmed via the same secondary summary; verify current section numbering and whether the Project's structure is classified permanent or temporary under the AHJ's interpretation, since that classification determines whether IBC Chapter 31 or IFC Chapter 24 governs.]
K. ASTM A500 (cold-formed welded steel structural tubing) and ASTM A36 (carbon structural steel), or ASTM B221 (aluminum extrusions), for frame posts, masts, and structural members, as scheduled.
L. ASTM A123 (zinc/hot-dip-galvanized coatings on structural steel shapes) and ASTM A153 (zinc coatings on iron and steel hardware), governing corrosion protection of exterior structural steel and hardware where galvanizing is scheduled.
M. Stainless steel wire rope/cable for edge and tensioning cable: [Type 316] construction, minimum breaking strength as published by the cable manufacturer and confirmed by the structural engineer of record against the factor of safety of Paragraph 1.4.C. [Verify the specific ASTM/federal specification designation the cable manufacturer certifies to, as cable products are commonly sold to manufacturer or military specification rather than a single universal ASTM designation.]
N. ICC A117.1 and the ADA Standards for Accessible Design, protruding-object and minimum head-clearance provisions, where the structure is sited over or immediately adjacent to an accessible route of travel. [Verify applicable clearance figures against the accessibility code edition adopted by the AHJ.]

1.4 PERFORMANCE REQUIREMENTS
A. Structural design: the complete structure — frame, fabric membrane, connections, and anchorage — shall be designed for the wind, snow (where applicable), seismic, and dead/live loads of ASCE 7 as adopted by the AHJ and the specific site's geographic design parameters, using the membrane-specific load combinations and provisions of ASCE 55. Design shall account for the scheduled fabric's air permeability — a knitted/pierced shade-cloth sail passes a portion of wind load through the fabric and is not loaded identically to a solid, coated membrane of the same area — but any permeability-based load reduction shall be justified by the structural engineer of record against the fabric manufacturer's published porosity/air-permeability data and the applicable ASCE 7 open/lattice-structure provisions, not assumed as a blanket percentage. [Verify the specific permeability credit, if any, taken for the scheduled fabric; do not apply a generic reduction without engineering justification documented in the sealed calculations.]
B. Delegated design: the Fabricator shall engage a structural engineer licensed in the state where the Project is located to prepare structural calculations and sealed shop drawings for the frame, connections, fabric tensioning, and anchorage, based on the governing code's loads and the Project's specific site/geographic wind, snow, and seismic parameters. Calculations and shop drawings shall be submitted for the Architect's and the Project's structural engineer of record's review before fabrication proceeds.
C. Minimum design factor of safety for edge cable, webbing, and fabric edge-attachment hardware: not less than [5]:1 against the manufacturer's rated breaking strength. [Verify the specific factor of safety required by the Project's structural engineer of record and the applicable code; 5:1 is a commonly used rigging/marine-hardware rule of thumb, not a universally codified minimum for this application, and the engineer of record's calculated value governs.]
D. Membrane fabric breaking strength, tear strength, and seam strength, as published by the fabric manufacturer under ASTM D4851 or D751 for the specific weight/construction scheduled, shall not be less than the structural engineer's calculated demand plus the factor of safety required by the Project's design.
E. Flame propagation: membrane and shade fabric shall pass NFPA 701 (Test Method 2 for coated/heavyweight fabric, as applicable to the scheduled construction) and shall be furnished with a test report or certification traceable to the specific fabric and finish installed, where required by IBC Section 3102 or IFC Chapter 24 per the structure's permanent or temporary classification. [Verify applicability with the AHJ before assuming every scheduled structure requires this testing; some jurisdictions exempt small, open-sided shade structures below a stated area or occupant-load threshold.]
F. UV/weathering durability: shade fabric shall retain not less than [verify] percent of original breaking strength after [verify] hours of xenon-arc exposure per ASTM D4355/G155, or shall meet the fabric manufacturer's published warranted service life against UV degradation (knitted polyethylene shade cloth is commonly warranted for a stated number of years against breakdown, typically marketed in the [10]-year range) [verify current manufacturer-specific warranty term and whether it is stated as a retained-strength percentage, a prorated replacement warranty, or both — this session located the applicable test method but no single industry-consensus retained-strength threshold].
G. Drainage and ponding: membrane geometry (minimum slope, high/low point configuration, or sail curvature/camber) shall prevent sustained water or snow ponding on the membrane surface; a flat or insufficiently pitched membrane panel is not acceptable regardless of fabric type.
H. Snow load: where the Project site is in a region with design snow load under ASCE 7 and the structure is not designed to shed snow by slope/geometry alone, the structural engineer of record shall design the frame and membrane for the full applicable snow load, or the Fabricator shall document an accepted basis for a reduction or exemption (for example, an open/breathable shade-cloth construction with negligible snow retention, or a seasonal removal/storage program completed before the onset of the snow season). [Flagged for the Owner's attention: a knitted, porous shade-cloth sail is not inherently a snow-load structure, and seasonal removal or an engineered exception is commonly required — do not assume a shade sail can simply remain deployed year-round in a snow-load region without the engineer of record addressing this directly.]

1.5 SUBMITTALS
A. Product data for frame material and finish, membrane fabric, thread, edge-attachment hardware, and rigging hardware.
B. Delegated-design structural calculations and shop drawings, sealed by a professional engineer licensed in the state where the Project is located, showing frame geometry, connection and baseplate details, anchor/foundation reactions, fabric panel layout and seaming/panelization pattern, tensioning sequence and target tension values, and edge-attachment details.
C. Samples: one fabric color/weave sample for each fabric scheduled, and one hardware finish sample for each type scheduled.
D. Qualification data: current confirmation of UU Registered Shop status in the Tensioned Fabric Structures trade category per Paragraph 1.6, plus a list of completed projects of comparable scope with owner contacts, and evidence of the Fabricator's structural-engineering capability (in-house or retained consultant) per Paragraph 1.6.D.
E. NFPA 701 and UV/weathering test reports or manufacturer certifications for the scheduled fabric.
F. Warranty documentation for frame finish/coating, fabric, and hardware.

1.6 QUALITY ASSURANCE — FABRICATOR QUALIFICATIONS AND UU REGISTERED SHOP STATUS
A. Fabricator shall be a current Upholsterers United (UU) Registered Shop in the Tensioned Fabric Structures trade category at time of bid and shall maintain that registration status throughout the Work.
B. UU Registered Shop status means the shop has cleared Upholsterers United's shop-registration process for that trade category, which verifies, in objective and documented terms:
1. A current business license and a current certificate of liability insurance on file with Upholsterers United;
2. A documented history of completed work in the trade category submitted to and reviewed by Upholsterers United;
3. Completion of a UU-monitored qualifying period of initial network jobs, assessed before the shop is granted full registration; and
4. The shop's agreement to Upholsterers United's network terms, including a minimum workmanship standard and warranty commitment applicable to work performed under the UU network.
C. Registration status is not a one-time credential; a shop that fails to maintain current insurance, licensing, or network terms is subject to removal from the UU directory, and a shop so removed no longer qualifies under this Section regardless of its registration at any earlier date.
D. In addition to current UU Registered Shop status, the Fabricator shall: maintain in-house or subcontracted structural-engineering capability sufficient to produce the sealed calculations and shop drawings required under Paragraph 1.4.B; have performed patterning, fabrication, and tensioning of architectural or shade fabric structures for a minimum of [5] years; and have completed at least [3] comparable tensioned-fabric-structure projects within the past [5] years.
E. Mockup: the Fabricator shall provide one fabric seam/edge-attachment sample for Architect approval before full fabrication, and, where the structure is large or geometrically complex, one fully assembled corner or edge-attachment detail mockup [as scheduled][Not Used].

1.7 NETWORK QUALIFICATION VERIFICATION
A. This Section does not name a single basis-of-design fabricator with a formal substitution process for alternates. Any current UU Registered Shop in the Tensioned Fabric Structures trade category is qualified to bid and perform this Work.
B. Not later than [10] days before bid, and again at [Contract award][shop drawing submittal], the Fabricator shall furnish documentation confirming current UU Registered Shop status as of that date, consisting of: (1) a printed or screen-captured confirmation of active Tensioned Fabric Structures-category registration from the upholsterersunited.com member directory, dated within [5] days of submission; (2) a current certificate of liability insurance; and (3) the completed-project list required under Paragraph 1.5.D.
C. The Architect or Owner may independently verify a bidder's or Contractor's registration status directly through the upholsterersunited.com member directory at any time before or during the Work.
D. Should a Fabricator's UU registration lapse after Contract award but before Substantial Completion, the Fabricator shall notify the Owner and Architect in writing within [5] business days of the lapse. The Fabricator remains bound by this Section's quality, submittal, and warranty requirements for all work performed, whether or not its registration is current at the time of notice; the Owner reserves the right to require completion of the remaining Work by another current UU Registered Shop at the lapsed Fabricator's expense if the lapse is not cured within [15] days.

1.8 EXISTING CONDITIONS AND COORDINATION
A. Where foundations, anchors, or host-building structural steel are furnished by others, the Fabricator remains responsible for verifying dimensional compatibility, embed locations, and load capacity against the sealed structural design before fabrication and erection proceed, and for reporting discrepancies in writing before continuing.

1.9 DELIVERY AND STORAGE
A. Fabric membrane shall be delivered rolled and protected from UV exposure, moisture, and abrasion until erection. Structural steel/aluminum components shall be protected from corrosion and finish damage during storage and handling until installation.

1.10 WARRANTY
A. Workmanship warranty: the Fabricator warrants frame fabrication, welded and bolted connections, fabric seaming, and tensioning workmanship against defects for [two years] from the date of Substantial Completion.
B. The structural design itself is not warranted as a product; it is covered by the structural engineer of record's professional liability and standard of care, consistent with the delegated-design submittal of Paragraph 1.4.B.
C. Membrane fabric is covered by the fabric manufacturer's warranty (commonly a prorated warranty against UV degradation over a stated term, in the [10]-year range) [verify current manufacturer-specific term]; frame finish/coating and hardware are covered by their respective manufacturers' warranties.

PART 2 – PRODUCTS

2.1 FABRICATOR
A. The Contractor shall engage a current Upholsterers United (UU) Registered Shop in the Tensioned Fabric Structures trade category, verified through the upholsterersunited.com member directory at time of bid, to perform the Work of this Section.
B. American Upholstery (Custom Upholstery, LLC), Phoenix, Arizona, is one example of a shop currently registered and qualified under this Section. This listing is provided as an example of a currently qualified network shop and does not establish American Upholstery as the exclusive or basis-of-design fabricator; any current UU Registered Shop in the Tensioned Fabric Structures trade category is equally qualified to bid and perform this Work.

2.2 STRUCTURAL FRAME
A. Posts, masts, and frame members: [steel tube/pipe per ASTM A500][steel plate/shapes per ASTM A36][aluminum extrusion per ASTM B221], sized and detailed per the sealed structural design of Paragraph 1.4.B.
B. Finish: [hot-dip galvanized per ASTM A123 (shapes) and ASTM A153 (hardware)][powder coat per manufacturer's architectural coating specification over galvanized or properly prepared substrate][as scheduled], appropriate to the installation environment, with manufacturer's published coating-system data submitted.
C. Compression rings, baseplates, and anchor connections as designed by the structural engineer of record, with anchor bolt pattern and embed depth coordinated with Division 03.

2.3 MEMBRANE FABRIC
A. Fabric type: [knitted HDPE shade cloth, UV-stabilized, [verify manufacturer's published shade-factor/UV-block percentage] knit density, as scheduled][PVC-coated polyester architectural membrane, as scheduled][PTFE-coated fiberglass architectural membrane, as scheduled].
B. Fabric shall meet the breaking strength, tear strength, and seam strength performance of ASTM D4851 or D751 per Paragraph 1.4.D, and the flame-propagation performance of NFPA 701 per Paragraph 1.4.E.
C. UV/weathering durability shall meet the performance of Paragraph 1.4.F, with manufacturer's published test data or warranty terms submitted.

2.4 EDGE ATTACHMENT AND RIGGING HARDWARE
A. Edge attachment: [keder (rope edge) in extruded aluminum track][continuous cable in a sewn or welted edge pocket][grommeted edge with lacing or shock cord], as scheduled and as detailed in the sealed shop drawings.
B. Edge and corner tensioning cable: stainless steel [Type 316] wire rope, minimum breaking strength and factor of safety per Paragraph 1.4.C.
C. Turnbuckles, D-shackles, thimbles, and associated rigging hardware: stainless steel [Type 316], marine-grade, load-rated by the hardware manufacturer, with [cotter pin][safety wire][locking collar] secondary retention on all load-bearing pinned connections as scheduled.

2.5 SEAMING AND THREAD
A. Seams in coated/laminated architectural membrane: [RF (radio-frequency) welded][heat-sealed], per the fabric manufacturer's recommended method, tested to the seam-strength performance of ASTM D4851/D751.
B. Seams and hems in knitted shade cloth and sewn edge pockets: sewn with [UV-stabilized bonded polyester thread][expanded PTFE (ePTFE) thread], rated by the thread manufacturer for UV service life not less than the fabric's own warranted service life. [Verify the specific thread manufacturer's published UV-life data rather than assuming parity with the membrane fabric's own rating.]

2.6 LABELING
A. Each structural component and fabric panel shall be labeled or tagged for erection sequence per the approved shop drawings.
B. Where required by the AHJ, an NFPA 701 compliance tag or certification shall be affixed to the membrane or transmitted with the closeout documentation per Paragraph 1.4.E.

PART 3 – EXECUTION

3.1 EXAMINATION
A. Before erection, the Fabricator shall verify that foundations, anchors, embeds, and any host-building structural steel are complete, correctly located, and within the tolerances shown on the sealed shop drawings, and shall verify that site grading and drainage do not direct ponding water toward the structure's low point. Discrepancies shall be reported in writing before erection proceeds.

3.2 ERECTION
A. Erect the frame per the sealed shop drawings; set posts/masts plumb and level within the tolerance specified by the structural engineer of record.
B. Complete bolted connections torqued per the manufacturer's or engineer's specification; complete field welding per AWS D1.1/D1.1M (steel) or AWS D1.2/D1.2M (aluminum), by welders currently qualified under the applicable code.

3.3 FABRIC INSTALLATION AND TENSIONING
A. Install and tension the membrane per the structural engineer's specified tensioning sequence and target tension values.
B. Verify uniform tension across each panel without wrinkling, scalloping, or localized overstress; where the design specifies instrumented tensioning, record and submit as-built tension readings at each measured point.

3.4 FIELD QUALITY CONTROL
A. Inspect the completed structure for plumb and level framing, uniform fabric tension, correct drainage/slope at the membrane surface, secure hardware (including cotter pin/safety-wire/locking-collar retention on turnbuckles and shackles as scheduled), and sound welded connections; correct deficiencies before Substantial Completion.
B. The structural engineer of record (or the Fabricator under the engineer's direction) shall perform and document a final field observation confirming the installed structure conforms to the sealed design, and shall furnish that observation report to the Owner and Architect before Substantial Completion.

3.5 CLEANING AND PROTECTION
A. Clean the membrane and frame per the fabric and finish manufacturers' recommended methods; remove shipping tags and protective wrap; protect the finished structure from damage by other trades until Substantial Completion.

3.6 OWNER INSTRUCTION
A. Instruct Owner's personnel in periodic inspection (hardware torque and secondary-retention condition, cable tension, fabric condition and cleanliness) and, where applicable under Paragraph 1.4.H, any required seasonal removal and storage procedure before the onset of snow season, with written maintenance instructions furnished at closeout.

Editor's sources: ASCE/SEI 55-16 scope (minimum requirements for analysis, design, and performance evaluation of membrane-covered structures using cables or rigid members, covering permanent/temporary and free-standing/attached structures, with membrane-specific LRFD/ASD load combinations) confirmed via ICC's published standard listing for ASCE/SEI 55-16 (shop.iccsafe.org); verify the current edition and whether a later edition supersedes 55-16. ASTM D4851's title and scope (Standard Test Methods for Coated and Laminated Fabrics for Architectural Use) confirmed via ASTM's own store listing; current/historical edition numbers (D4851-97, -07, and later reapprovals) were found listed but the specific current edition should be verified before citation in an issued document. IBC Section 3102.3.1's "noncombustible or NFPA 701" framework for permanent membrane structures, and IFC Section 2404.2's flame-resistance testing-laboratory certificate requirement for temporary membrane structures, were confirmed via a secondary summary of the code text (specialtyfabricsreview.com); this session did not retrieve the primary ICC code text directly, so current section numbering should be verified against the specific IBC/IFC edition and any state amendment adopted by the AHJ, and the 180-day permanent/temporary threshold should be confirmed against the edition in force. ASTM D4355 (geotextile UV/xenon-arc deterioration test) and its relationship to the general ASCE/ASTM G155 xenon-arc exposure apparatus practice are cited from general industry knowledge of accelerated-weathering test methods for synthetic fabrics; no industry-consensus retained-strength percentage/duration threshold for shade cloth specifically was confirmed, and Paragraph 1.4.F is marked [verify] accordingly. The 5:1 cable/hardware factor-of-safety figure in Paragraph 1.4.C is a commonly used rigging/marine-hardware convention, not a verified code-mandated minimum for this specific application, and is marked [verify] for engineer-of-record confirmation. Wind-load permeability credit for porous shade-cloth structures (Paragraph 1.4.A) is flagged as an engineering judgment requiring case-specific justification against ASCE 7's open/lattice-structure provisions and the fabric manufacturer's porosity data, not a figure this session could confirm as a standard blanket percentage. AISC 360, AWS D1.1/D1.2, ASTM A500/A36/B221, and ASTM A123/A153 are cited by their well-established, unambiguous titles and scopes and were not independently re-verified in this session beyond general professional knowledge of structural steel/aluminum design and corrosion-protection practice.