Window coverings are often specified late in the design process—but the decisions made at that stage have significant implications for energy performance, occupant wellbeing, and project certification. This guide consolidates the specification information architects and design teams need for San Diego projects: CSI sections, product performance data, LEED credit paths, Title 24 compliance methods, WELL Standard requirements, and coordination notes with other trades.
Also available:
Royal Window Coverings provides free CSI 3-part specification sections, LEED documentation packages, and product data submittals for all projects. See our Architecture Services page or request a spec package.
CSI MasterFormat Division 12: Furnishings
Window treatments are specified under Division 12 — Furnishings in the CSI MasterFormat 2016 system. The relevant sections:
| Section | Title | Typical Products |
|---|---|---|
| 12 21 00 | Window Blinds | Horizontal blinds, vertical blinds, faux wood, real wood, aluminum |
| 12 21 13 | Horizontal Louver Blinds | 2" faux wood, 1" aluminum Venetian, 2.5" real wood |
| 12 21 16 | Vertical Louver Blinds | PVC vertical, fabric vertical, panel track |
| 12 22 00 | Curtains and Drapes | Pinch-pleat drapery, grommet panels, ripple-fold |
| 12 24 00 | Window Shades | Roller shades, solar shades, honeycomb, Roman |
| 12 24 13 | Roller Window Shades | Manual or motorized roller; solar or blackout fabric |
| 12 25 00 | Window Treatment Operating Hardware | Motorized tracks, traverse rods, hold-downs |
| 12 25 13 | Motorized Window Treatment Controls | Motor systems, remotes, wall controls, sensors |
Division 26 / 27 coordination: Hardwired motorized shades require a dedicated 120V circuit to each motor location, low-voltage control wiring (for centralized systems like Lutron Quantum or Crestron), and conduit routing through header tubes or chase walls. Electrical rough-in must be complete before blind/shade installation. We provide a motor wiring guide to electrical during design development.
Product Selection Matrix for San Diego Projects
The right product depends on performance requirements, building type, and certification goals. Use this matrix as a starting point:
| Product | Best Building Type | LEED Relevant | Title 24 Credit | WELL Relevant |
|---|---|---|---|---|
| Motorized Solar Shade (1–5% openness) | Office, hospitality, multifamily | Yes — daylight & energy | Yes — SHGC reduction | Yes — Concept 54 |
| Motorized Blackout Roller Shade | Hotel guest rooms, theater, healthcare | No direct credit | Yes — solar gain control | Yes — sleep quality (Concept 57) |
| Motorized Drapery (ripple-fold) | High-end hospitality, residential, lobby | Limited | Limited | Indirect |
| Motorized Exterior Solar Screen | South/west-facing curtain wall, patio | Yes — highest EA credit | Yes — best SHGC impact | Yes |
| Motorized Honeycomb Shade | Multifamily, LEED residential, healthcare | Yes — insulation R-value | Yes — U-factor improvement | Yes |
| Plantation Shutters | Residential, boutique hospitality | Limited | No direct credit | No |
LEED v4 Credit Paths for Window Coverings
Window coverings can contribute to multiple LEED v4 credit categories. Here are the direct credit paths most relevant to San Diego commercial and multifamily projects:
EA Credit: Optimize Energy Performance (Most Impactful)
Under the Performance Method using ASHRAE 90.1 Appendix G (or CEC ACM), automated interior solar shades and exterior shading systems are modeled as dynamic shading devices. The energy model must demonstrate reduced cooling energy compared to the EA Prerequisite baseline model.
Key inputs we provide for energy modeling:
- Fabric Solar Transmittance (Ts), Reflectance (Rs), and Absorptance (As) by angle
- Openness Factor certification (NFRC 301 or equivalent)
- Automation control strategy description (sensor type, setpoint, schedule)
- Product shading coefficient (SC) or SHGC reduction factor
IEQ Credit: Daylight (IEQ 7 / BD+C)
Points available for achieving spatial Daylight Autonomy (sDA) ≥ 55% at 300 lux for 55% of regularly occupied floor area (Option 1) or providing view glazing (Option 2). Automated solar shades are explicitly recognized as glare control devices. The calculation must demonstrate that sDA and Annual Sun Exposure (ASE) thresholds are met. Shades with low ASE contribution (i.e., they block direct sun effectively without eliminating all daylight) perform best in this credit.
IEQ Credit: Quality Views
Automated shades that retract when direct sun is not present maximize occupied hours with view access and can contribute to this credit by demonstrating that view glazing remains unobstructed for a significant portion of occupied hours.
California Title 24 Part 6 — Window Covering Compliance
California's 2022 Title 24 Building Energy Standards address window coverings primarily through the envelope and lighting control sections:
Envelope — Section 140.3 (Nonresidential) / Section 150.1 (Residential)
The Prescriptive Method uses tabulated maximum SHGC values by climate zone. San Diego is in Climate Zones 7 and 10 depending on location (coastal vs. inland). Interior solar shades can be claimed as a “secondary shade device” reducing effective SHGC when using the Performance Method (ACM).
The ACM Reference Manual (California Energy Commission) provides the calculation method for dynamic shade credits. We provide supporting data in the format required by EnergyPro, EQUEST, or DOE-2 energy modeling software.
Lighting Controls — Section 130.4
Title 24 requires automatic daylight-responsive controls in daylit zones (Section 130.4(a)). Motorized solar shades integrated with the lighting control system (shared daylight sensor triggering both shade deployment and dimmer response) are the highest-performance approach. We coordinate the shade automation setpoint with the lighting designer to ensure consistent response curves.
WELL Building Standard — Relevant Concepts
WELL v2 addresses window coverings indirectly in several Concepts:
- Light Concept — Feature L04 (Circadian Lighting Design): Automated solar shades that modulate daylight through the day support circadian rhythm by allowing higher blue light exposure in the morning (shades retracted) and reduced exposure in late afternoon (shades deployed at low sun angles). Automated shade control is listed as a supporting strategy.
- Light Concept — Feature L06 (Visual Lighting Design / Glare Control): WELL requires glare control options for all occupants. Motorized solar shades with user override meet this requirement. The specification should include documentation that shades can be individually controlled by occupants.
- Mind Concept — Feature M07 (Restorative Spaces): View access is cited as a restorative environmental feature. Automated shades that default to retracted when glare is not an issue maximize view access for occupants in open office and healthcare settings.
Submittal and Coordination Timeline
| Phase | Deliverable from Royal WC | Timeline |
|---|---|---|
| Schematic Design | Product consultation + performance data for energy model | 1–2 weeks from engagement |
| Design Development | Preliminary product selection, CSI spec sections draft, motor wiring guide to MEP | 2 weeks from DD kickoff |
| Construction Documents | Final Division 12 spec sections, product data sheets, color sample submittals | 2 weeks from CD kickoff |
| Construction Administration | Shop drawings, installation drawings, RFI responses | 10–14 days from contract signing |
| Closeout | O&M manuals, motor programming documentation, LEED documentation package | At substantial completion |
Common Specification Mistakes and How to Avoid Them
- ❌ Specifying “motorized shade, owner to select manufacturer” without system type. Different motor protocols are incompatible. Specify the motor system (Somfy io, Lutron Sivoia, Rollease Automate) or require all shades in the project to use the same protocol.
- ❌ No electrical coordination for motorized shades. Forgetting to coordinate 120V circuits with Division 26 until construction phase results in change orders. Include motor circuit requirements in DD electrical drawings.
- ❌ Specifying fabric by color only without openness factor. A “white solar shade” can range from 1% to 14% openness factor—with dramatically different daylight and glare characteristics. Specify openness factor by room or orientation.
- ❌ No header pocket clearance in millwork details. Motorized roller shade tubes require a minimum 2.5–4 inch deep × 3–5 inch wide header pocket inside a soffit or millwork header. Coordinate with millwork shop drawings.
- ❌ Excluding window covering installer from pre-construction coordination meeting. Shade installation is a late-stage finish trade that depends on completed framing, drywall, millwork, and electrical. Including the installer in pre-con prevents scheduling gaps.
Frequently Asked Questions
Frequently Asked Questions
What CSI division covers window coverings?
Window coverings fall under CSI MasterFormat Division 12 — Furnishings. Specifically: 12 21 00 (Window Blinds), 12 22 00 (Curtains and Drapes), 12 24 00 (Window Shades), and 12 25 00 (Window Treatment Operating Hardware). For motorized systems with dedicated wall controls, there may be scope overlap with Division 26 (Electrical) for power circuits and Division 27 (Communications) for low-voltage control wiring.
Which window covering products qualify for LEED credits?
Interior solar shades and automated exterior shades can contribute to LEED v4 credits in multiple categories: EA Prerequisite 2 (Minimum Energy Performance) via ASHRAE 90.1 Appendix G daylight modeling; IEQ Credit: Daylight (IEQ 7) via sDA/ASE calculations using shade geometry; IEQ Credit: Quality Views; and SS Credit: Heat Island Reduction for exterior shading of mechanicals. We provide LEED documentation packages upon request.
How do I specify window coverings for Title 24 compliance in California?
California Title 24 Part 6 (Building Energy Standards) addresses window coverings primarily in Sections 130.4 (Mandatory Lighting Controls) and 140.3 (Envelope Prescriptive Requirements). Automated interior solar shades with daylight sensors can be credited in the Performance Method (ACM) as reducing solar heat gain coefficient (SHGC). Specify shades with documented SC (shading coefficient) or SHGC reduction values, and include integration with the building's Title 24-compliant daylight control system.
What submittal documents does Royal Window Coverings provide for architectural projects?
We provide: product data sheets (manufacturer spec sheets with performance data), fabric sample submittals (color/texture samples for owner review), shop drawings (installation drawings showing mounting details, motor placement, and clearances), LEED documentation (daylight modeling input data, product energy certifications), and Title 24 compliance statements. Submittals are typically ready 10–14 days after signed contract.
Can you provide specification language for Division 12 project manuals?
Yes. We provide CSI 3-part specification sections for all product types we install—solar shades, motorized roller shades, motorized drapery, exterior shades, and plantation shutters. These specs are written to the 3-part format (General, Products, Execution) and can be incorporated directly into your project manual. Contact us with your project type and we'll send the appropriate spec sections.
Request a Specification Package for Your Project
CSI 3-part spec sections, LEED documentation, product data sheets, and motor wiring guides — all at no charge for design professionals.
Architecture Services →Send Project Brief