Rolling Shutter Specifications for Architects & Consultants
Table of Contents
Rolling shutters are specified late and installed last — but the decisions made at schematic design stage determine whether the installation goes smoothly or creates conflicts that cost money to resolve during construction. This guide is for architects, PMC consultants, and building services engineers who need to get rolling shutter specifications right at the drawing stage.
Early-Stage Coordination Points
The three coordination points that save the most rework on site:
- Confirm clear opening vs rough opening at schematic design. Rolling shutters are sized to the clear opening — the final usable aperture. The rough opening in the structural frame must be 100–150mm wider (50–75mm per side for guide rails) and 300–500mm taller (for drum housing).
- Coordinate with structural engineer for lintel loads. A heavy motorised shutter on a large opening (5m × 5m galvalume, ~200kg curtain weight + 80kg motor assembly) applies point loads on the lintel. This must be in the structural brief.
- Agree on electrical provision early. Motorised shutters need a dedicated power drop at the motor location — typically 230V single-phase for shutters up to ~200kg curtain weight, 415V three-phase for larger. Electrical contractor coordination must happen before first-fix.
Headroom & Housing Box Requirements
The drum, spring assembly, and motor for a rolling shutter require clear headroom above the lintel. This is the most common coordination failure in architectural drawings — insufficient headroom is discovered on site, requiring either a raised lintel (structural cost) or a surface-mounted external box (aesthetic compromise).
| Clear Opening Width | Drum Diameter (approx) | Min Headroom Required | Notes |
|---|---|---|---|
| Up to 3,000mm | 200–250mm | 350mm above clear opening | Motor fits within headroom |
| 3,000–5,000mm | 250–350mm | 450–500mm above clear opening | Confirm motor end vs idler end |
| 5,000–7,000mm | 350–450mm | 550–650mm above clear opening | Twin motor — allow both ends |
| 7,000–10,000mm | 450–600mm | 700–900mm above clear opening | Heavy-duty tube diameter, engineer review |
Common error: Architects allocate headroom for the drum only and forget the spring assembly. The full spring assembly extends 150–250mm beyond the drum on the non-motor side. Show this on elevation drawings or the spring will foul the slab soffit.
Specifying Materials in Drawings
Use these descriptions in your door schedules and specifications:
Specification Language — Standard Industrial
- Curtain 0.8mm Z275 galvalume steel, 77mm C-profile interlocking slats, powder coat finish to RAL [XXXX]
- Bottom bar Foam-filled aluminium extrusion with EPDM floor seal
- Guide rails 50mm × 75mm mild steel guides, hot-dip galvanised; depth 75mm for spans >5,000mm
- Drum Galvanised steel tube, diameter per engineer's schedule, counterbalanced torsion spring
- Motor [FAAC / Somfy T35 / Nice MBA] — 230V single-phase, torque as per schedule, IP44 minimum
- Controls Key switch + remote receiver; provision for BMS dry-contact integration
- Safety Obstruction reversing mechanism on bottom bar, manual override crank
Specification Language — Aluminium Aesthetic
- Curtain 1.0mm extruded aluminium, 55mm flat-profile slats, anodised natural or powder coat to RAL [XXXX]
- Bottom bar Aluminium extrusion with EPDM seal, concealed fixing
- Guide rails Aluminium extrusion, colour-matched; surface-mounted or built-in as per detail
- Motor Tubular motor within drum, 230V, IP44 minimum
- Controls Flush-mounted key switch, remote, hardwired fire-alarm input
- Vision Polycarbonate vision panels to pattern as per elevation drawings
Fire Ratings & NBC 2016 Compliance
The National Building Code of India (NBC) 2016, Part 4 (Fire and Life Safety), defines where fire-rated shutters are mandated. Key clauses applicable to rolling shutters:
- Clause 4.3.2: Openings in fire compartment walls must be protected with fire-rated doors or shutters of at least the same rating as the wall.
- Clause 4.9.4: Automatic fire shutters in public buildings, industrial buildings, and high-rise structures must be linked to the fire alarm system and close automatically on alarm.
- Clause 4.9.5: Fire shutters must be rated by a NABL-accredited test laboratory to IS 3614 (Part 2) — fire resistance testing of rolling shutters.
For architects: Specify fire-rated shutters separately from standard shutters in the door schedule. Clearly note rating required (30 min / 60 min / 120 min), automatic closure mechanism (fusible link, fire alarm interface, or both), and test certificate requirement (IS 3614 Part 2, NABL-accredited lab).
Electrical & BMS Coordination
Coordinate these points with the MEP engineer and BMS designer at concept/schematic stage:
| Requirement | What to Specify | Coordinating Party |
|---|---|---|
| Power supply | 230V / 415V, dedicated circuit, MCB rating per motor | Electrical engineer |
| Control conduit | 25mm conduit from motor to control panel location | Electrical engineer |
| BMS integration | Dry-contact or RS485 Modbus input/output at motor controller | BMS designer |
| Fire alarm interface | Normally-open relay from FACP to motor — releases auto-drop on alarm | Fire alarm engineer |
| Access control | Key switch, card reader, or keypad — confirm voltage level (12V/24V) | Security designer |
Common Specification Errors — and How to Avoid Them
Error 1: Specifying domestic shutters for commercial use
A common error is specifying a single spring-duty class without considering cycle life. Domestic springs (rated 15,000–25,000 cycles) fail in commercial applications within 2–3 years. Always specify spring duty class in the door schedule: Standard (25,000), Commercial (50,000), Heavy-duty (100,000), or Industrial (200,000+).
Error 2: Omitting guide rail depth from drawings
Guide rail depth (the projection from the wall face into the opening) is often omitted from architectural drawings. On wide openings, 75mm guides project significantly into the usable clear width. Show guide rail profiles on plan details — especially at vehicle openings where clearance is critical.
Error 3: No allowance for motor-end box
Side-entry motors require a box recess of 300–400mm at the motor end. This is often not shown in elevation drawings, leading to site conflicts with adjacent walls or columns.
Error 4: Specifying polycarbonate vision panels without structural review
Polycarbonate insert panels require the curtain slats to be modified — they increase wind load and can cause curtain distortion if not engineered. Always note in the specification that vision panel sizes require manufacturer confirmation.
"Send us the drawing at schematic stage — not after structure is cast. We can avoid 90% of site conflicts if we see the headroom and lintel details early."
Door Schedule Template
Use these columns in your rolling shutter door schedule to capture all specification parameters needed for accurate quotation and manufacturing:
| Column | Description | Example |
|---|---|---|
| Door Mark | Drawing reference | RS-01 |
| Location | Floor + description | GF Dock Bay 3 |
| Clear Width (mm) | Usable clear opening | 4,500 |
| Clear Height (mm) | Usable clear opening | 4,500 |
| Curtain Material | See spec | 0.8mm Galvalume Z275 |
| Finish / RAL | Colour reference | RAL 7016 Anthracite |
| Operation | Manual / Motorised | Motorised |
| Motor Torque | Nm or brand + model | FAAC 400 Nm |
| Spring Duty | Cycle life class | Heavy-duty 100,000 |
| Fire Rating | Min / None | 60 min IS 3614-2 |
| BMS Interface | Yes / No | Yes — dry contact |
| Vision Panels | Yes / No + pattern | No |
| Headroom Available | mm above clear opening | 550mm |