How to Install Steel Rolling Shutters? [PDF]

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Steel rolling shutter is a type of door built up of interlocking lath sections formed from cold-rolled steel strips and is usually used in godowns and shops.

The steel rolling shutter shall be either push-pull type or operated with a mechanical device. If the area of the shutter is up to 10 sq.m, it shall be a push-pull type shutter, and if the area is over 10 sq.m, it should generally be provided with reduction gear operated by a mechanical device with a chain or handle.

Material Specification of Rolling Shutter

1. Shutter

1. The shutter shall be built up of an interlocking lath section formed from cold-rolled steel strips.
2. The thickness of the sheet from which the lath sections shall be rolled shall not be less than 0.90 mm for the shutters up to 3.5 m width and not less than 1.20 mm for shutters above 3.5 m width.
3. The shutters with width over 9 meters should be divided into two parts with the provision of one middle movable or fixed guide channel or supported from the backside to resist wind pressure.
4. The lath section shall be rolled to have interlocking curls at both edges and a deep corrugation at the center, with a depth of the bridge not less than 12 mm to provide sufficient curtain of stiffness for resisting manual pressures and normal wind pressure.
5. Each lath section shall be a single continuous piece without any welded joint.
6. When the laths are interlocked, the lath sections shall have a distance of 75 mm rolling centers. 
7. Each alternate lath section shall be fixed with mild steel clips or malleable cast iron securely riveted at either end to lock the lath section from both ends and preventing lateral movement.

2. Spring

1. The spring shall be of coiled type.
2. The spring shall be manufactured from high tensile spring steel wire or strips of adequate strength.

3. Roller and Brackets

1. For shutter up to 6-meter width and height not exceeding 5 meters, 50mm steel pipes shall be used. 
2. A mild bracket of size 375 x 375 x 3.15 mm shall be used to support the shaft for shutters up to a clear height of 3.5 meters.
3. For a shutter of clear height above 3.5 m up to 6.5 m, a mild steel bracket of size 500 x 500 x 10 mm shall be used.
4. The suspension shaft clamped to the brackets shall be fixed with rotatable cast iron pulleys to which the shutter is attached. 
5. The pulleys and pipe shaft shall be connected using pretension helical springs to keep the shutter in equilibrium in any partially open position and counterbalance the shutter's weight.
6. When the width of the opening is greater than 3.5 meters, the cast iron pulleys must be interconnected with a cage formed of mild steel flats of at least 32 x 6 mm and mild steel dummy rings to distribute the torque uniformly.
7. Self-aligning two-row ball bearings shall be provided at the extreme pulley, and caging rings shall have a minimum spacing of 15 mm, and at least 4 number flats running throughout the length of roller shall be provided.
8. In case of shutters of large width with mechanical opening, the roller shall be fitted with a pinion wheel at one end, which in contact with a worm fitted to the bracket plate, caging, and pulley with two ball bearing shall be provided.

4. Guide Channel

1. The width of the guide channel shall be 25 mm. The minimum depth of the guide channels may be chosen from table 1.
2. The gap between the two legs of the guide channels shall be sufficient to allow the shutter's free movements and, at the same time, close enough to prevent the rattling of the shutter due to wind.
3. Every guide channel shall be provided with a minimum of three fixing cleats or supports for attachment to the walls or column using bolts or screws.
4. The spacing of cleats shall not exceed 0.75 m. Alternatively, the guide channels may also be provided with suitable dowels, hooks, or pins for embedding in the walls.

Table 1: Depth of the guide channel for different width of shutter.

Clear width of shutters	Depth of guide channel
Up to 3.5 m	65 mm
3.5 m up to 8 m	75 mm
8 m and above	100 mm

5. Top Cover

1. Top cover shall be of mild sheets not less than 0.90 mm thick and stiffened with angle or flat stiffeners at top and bottom edges to retain shape.

Fixing of Rolling Shutter

1. The brackets shall be fixed on the lintel or under the lintel as specified with raw, plugs, and screws bolts. 
2. The shaft, along with the spring, shall then be fixed on the brackets.
3. The lath portion (shutter) shall be laid on the ground, and the side guide channels shall be bound with ropes, etc.
4. The shutter shall then be placed in position and top fixed with pipe shaft with bolts and nuts.
5. The side guide channels and cover frames shall then be fixed to the wall through the plate welded to the guides.
6. These plates and brackets shall be fixed using steel screws bolts, and wall plugs concealed in plaster to make their location invisible.
7. Fixing shall be done accurately in a professional manner so that the shutter operation is easy and smooth.

FAQs on Steel Rolling Shutter

Read More:
1. 18 Types of Doors Used in Building Construction
2. ROLLING SHUTTERS SPECIFICATIONS