Short answer: When choosing a galvanized steel roller shutter, determine in order: the opening dimensions and wind load, the slat profile (77/97/115 mm), the slat thickness (0.75–1.20 mm), a motor type suited to the daily cycle count, the safety equipment and the control method. Shops typically use 0.75–0.90 mm slats, while warehouses and industrial sites use 1.00–1.20 mm slats with an industrial-grade motor.
Choosing a roller shutter often starts and ends with the question "how many metres by how many metres?". Yet two openings of the same size can require completely different systems when their frequency of use, wind load, security expectations and electrical infrastructure differ. A poorly chosen shutter soon slows down, becomes noisy, strains the motor and starts generating unexpected service calls. In this guide we go through, in order, the decision steps to follow to choose the right galvanized steel roller shutter.
Where should you start: how is a needs analysis carried out?
Before moving on to technical details, the role of the opening must be clarified. The following four questions frame all subsequent decisions:
- What will the shutter protect? A warehouse holding valuable stock or a jeweller does not require the same level of security as a café that closes at night.
- How many times a day will it open and close? A shop shutter opened in the morning and closed in the evening and a loading bay door used for dispatch all day require different motor classes.
- How exposed is the opening to wind? A shop on a city street and a hangar door facing open ground on an organised industrial zone (OSB) are not exposed to the same wind load.
- Is insulation or window visibility required? This question determines the series: standard steel, polyurethane-filled or perforated/vision-panel slats.
Once these answers are clear, the slat, motor and accessory choices can be made far more accurately. Preparing the width and height of the opening and photos showing its top and both side walls before the site survey also speeds up the preliminary quotation process.
How are the slat type and thickness chosen?
Slat profile: 77, 97 or 115 mm
The slat profile refers to the height of the profile. A wider slat means fewer, more rigid profiles for the same opening. Pack Door's standard galvanized series offers 77, 97 and 115 mm options. For wide, windy openings, 97–115 mm slats are preferred; for very wide openings such as industrial zone hangars, 115 mm slats are used with a heavy-duty shaft and motor. In narrower shop openings, 77 mm slats are common.
Slat thickness: 0.75–1.20 mm
Slat thickness is the gauge of the steel sheet and directly affects impact resistance. While 0.75–0.90 mm is sufficient for shops, thicker 1.00–1.20 mm slats are preferred for warehouses, industrial premises and wide, windy openings. Because thicker slats increase the total weight of the shutter, the motor must be selected accordingly; where necessary, the opening is divided with an intermediate guide post.
Series selection
The single-walled KM Steel series is considered where security is the priority, the double-walled KM Polyurethane series (55 / 77 mm) where thermal and acoustic insulation and quiet closing are the priority, and the KM Perforated series for shops that need a night-time window display.
How are the motor and automation chosen?
Three drive types are used on galvanized steel roller shutters: central motor, side motor and tubular motor. Manual operation is also an option but is not recommended for wide, heavy shutters.
- Central motor: Mounted in the middle of the shaft; high-cycle models are preferred for doors that open and close frequently. Use with a safety brake is recommended.
- Side motor: Connected to the side of the shaft; provides powerful drive for heavy, wide shutters and requires extra space next to the shaft inside the box.
- Tubular motor: Fitted inside the shaft and runs quietly; suitable for polyurethane-filled and lighter shutters, in settings such as villa garages.
Motor torque is determined by the shutter weight, calculated from the slat type, slat thickness and opening dimensions. Control options include remote control, key switch and smartphone control. For power cuts, central and side motors have a chain or crank manual override; with an optional battery backup unit, motorised operation can continue throughout the outage. On tubular motor shutters, a key-operated emergency release box is added for access from outside.
Selection table by usage scenario
The table below is a starting point for common scenarios. The final configuration is confirmed during the site survey based on measurements and site conditions.
| Scenario | Slat | Thickness | Drive | Recommended additional equipment |
|---|---|---|---|---|
| High-street shop, low cycle count | 77 mm (perforated option for window display) | 0.75–0.90 mm | Central or tubular motor | Photocell, remote control |
| Warehouse loading door, heavy traffic | 97–115 mm | 1.00–1.20 mm | High-cycle central motor | Safety brake, bottom safety edge |
| Industrial zone hangar, wide windy opening | 115 mm | 1.00–1.20 mm | Industrial-grade motor | Heavy-duty shaft, intermediate guide post if needed |
| Jeweller and bureau de change | Heavy-gauge steel slat | Upper range | Central or side motor | Reinforced lock profile, battery backup unit |
| Villa garage, pharmacy | 55 / 77 mm polyurethane-filled | Double-walled | Tubular motor | Key-operated emergency release box, smartphone control |
Note from the field: The most critical information affecting motor selection during a site survey is the business's real operating pattern. We often see on site that a warehouse door described as "opened a few times a day" is actually used all day because of shift working. That is why we ask customers about dispatch times and shift patterns. In addition, having the power supply for the motor already run to the box position is a detail that shortens installation day and removes the need to cut cable channels later.
Common mistakes
- Comparing on price alone: Quotations are not comparable unless the slat type, slat thickness and motor class are the same. We explain how these items affect price in our article on factors affecting galvanized steel roller shutter prices.
- Underestimating the cycle count: A residential-grade motor on a heavily used door soon leads to overheating and breakdowns.
- Ignoring wind load: In a windy opening, thin slats and a narrow profile can cause the slats to be forced out of the guide rails.
- Leaving the emergency opening solution until later: In shops whose only entrance is the shutter, a power cut locks the business in or out if there is no emergency release.
- Leaving maintenance out of the contract: In systems without a periodic maintenance plan after installation, small adjustment issues grow into bigger problems.
Frequently asked questions
What slat thickness is sufficient for a shop?
For shop-sized openings, a thickness of 0.75–0.90 mm is generally sufficient. If the opening is wide or the street is exposed to wind, thicker slats and a wider slat profile are considered.
Can just the motor of an existing shutter be replaced?
If the slats, shaft and guide rails are in good condition, the motor can be replaced. The new motor's torque must be matched to the shutter's weight, the limit settings must be reset and the safety equipment must be checked.
How do production and installation proceed after the site survey?
A quotation is prepared based on the measurements taken during the site survey; once approved, the shutter is made to measure at our facility in Tuzla. Installation of a single shutter is usually completed on the same day, depending on site preparation; the guide rails, shaft, motor and controls are installed, and the system is tested before handover.
Conclusion and next step
The right galvanized steel roller shutter is achieved by planning the needs analysis, slat and thickness selection, a motor suited to the cycle count and complete safety equipment together. To keep the system running smoothly for years after installation, you can also review our galvanized steel roller shutter maintenance schedule. You can find the technical values on the galvanized steel roller shutter page, and submit a free site survey request by sharing the dimensions and a photo of your opening.
