At Coroma, attention to detail is a top priority. Whether you’re an architect, D.I.Y enthusiast or looking for a garage door with a perfect fit, our technical information brochure is sure to help you. Feel free to download the entire brochure or simply view the relevant information sections.
If you have any questions, click here to contact us.
Download our Full Brochure here:
Universal Door Type Overview
The basic concept is to provide a universal door type, adaptable to suit most needs. A door type that is capable of withstanding the gale force winds of the Cape and the extreme climate of the Highveld. To provide an aesthetically pleasing, high-performance door that is suitable for a wide range of applications. Ideal for a simple hatch situation or even a multi-user, double lane traffic way requiring automatic operation.
- Computer aided design CAD – spring balancing ensures ease of hand operation.
- Decorative options feature full glazing in the Coroview range including the insertion of vision panels in the rolled steel and extruded aluminium fluted panel ranges.
- Colour finishes that feature ultra-violet resistant powder coats with urethane enamel paint are applied under factory controlled conditions.
- Optimal weather sealing is achieved by the “Wedging” action of the door in closing, caused by the tapered setting of the vertical tracks.
- Panels may be fitted with louvred ventilators and equipped with filter media if required.
- Rigidity of the door panel is ensured in widths of up to 7,000 mm wide.
- Materials range include panels formed of galvanised rolled steel and extruded fluted aluminium with optional insulation including extruded frame sections for glazing and shopfront type applications.
- Accessories cover add-on seals and gaskets for improved dust-proofing capability.
- Electric operators in both standard and purpose designed options suit both original and add-on installation.
- Realistic prices and installations at S.A’s main centres.
- D.I.Y. users can enjoy convenient transportation and installation due to the modular construction of the door system.
Preparation of Openings
Unless otherwise specified, it is always assumed that adequate nib and headroom space, to suit the particular door, is available to permit fixing in one plane and that the headroom extends internally to the depth of the intrusion of the door overhead.
A typical masonry opening as shown in Diagram 2 below provides the most economical and simple fixing situation. Note that this provides for fixing of the door in one plane and how the headroom is available for the intrusion depth of the door. The nibs on either side of the opening are required for the fixing of the track mounting angles shown in Diagram 1 above. The availability of headroom as provided by the lintel in Diagram 2 or the purlins in Diagram 3 enable the positioning of the torsion shaft assembly which is generally fixed immediately above the door by means of the bearing brackets as shown in Diagram 1.
The structural steel opening shown in Diagram 3 above, illustrates a more complex installation situation. It also illustrates that a greater door opening height can be achieved if the gusset member, between column and rafter, can be offset to provide fixing space clearance at position A. The more conventional positioning of the gusset at position B, generally results in less of a clear opening height. However, plating out of the column flanges can provide the required nib fixing space as is shown in Diagram 8. The two horizontal purlins illustrated are required to provide a fixing surface for the torsion spring bearing brackets as well as to form the top closure member of the opening. These purlins should be on the same plane as the inner flanges of the columns to ensure that the door components are fixed in that same plane.
Note that the rafters overhead will provide convenient fixing points for the horizontal overhead tracks of the door.
In a standard masonry opening, the tapered track mounting angles are fixed directly to the nibs or faces with expanding bolts as shown in Diagram 4 and 5 above. It is preferred that these surfaces be plastered to obtain an accurate relationship of the door to the wall and to keep the clearances between the opening and the door face to a minimum.
Important Note: Brick cavities and hollow blocks should be filled solid with mortar for a width of 230 mm minimum at nibs to enable the track mounting angles to be fixed securely with expanding/ Rawl bolts.
In Diagram 6 above a “No-Nib” situation is shown. A false nib 150 mm wide formed of 4 mm steel can be provided which provides sufficient space to allow the use of a hand chain operator. It is often necessary to provide intermediate mullions to reduce over-wide openings. Typical construction and overall size is illustrated in Diagram 7.
Diagram 8 illustrates the situation where a structural steel column has been plated out to provide sufficient nib due to a gusset overhead preventing the direct fixing of the flange to the column. The left-hand plating of 90 mm is sufficient for track handling. The right-hand plating of 150 mm is sufficient for the track and hand chain operator. Diagram 9 illustrates standard fixing to the structure where the height requirement and the need for hand chain operator poses no problem.
Lifting System Specification
The installation consultant should select the system best suited to the headroom available and also consider the internal traffic clearance under the door. Overhead gantry cranes may cause a need to select “High” or “Vertical” lift systems to avoid conflict between movement of the crane and opened doors.
Standard Lift Doors as illustrated in Diagram 10 below are the most economic of the springing systems and the opened door is situated at a height slightly greater than the clear height of the opening.
Doors of up to 3 metre in height do not require a sloped overhead track as illustrated in Diagram 10 above unless they are to be hand chain operated. Up to this height, these doors are generally “push-up” operated unless the installation consultant particularly selects a hand chain operator. “Push-up” standard lift sectional doors are equipped with a hand pull down cord and a short pulling stick where the door opening height is beyond hands reach (2,500 mm – 3,000 mm). A headroom of 350 mm is the minimum requirement for “push-up” standard lift doors.
Doors in excess of 3,000 mm height are fitted with reduction geared continuous hand chain operators and are fitted to either end of the torsion shaft (see Diagram 1). The overhead track is sloped at approximately 5 degrees so that the door will lower under its own weight as the hand chain rotates the torsion shaft, releasing cable from the cable spools. The table in Diagram 10 shows the headroom (see “MH”) required to maintain the 5 degree slope according to the door height.
Where the headroom is in excess of 2,000 mm, the use of a high lift system is recommended. The track hangers supporting the overhead tracks may otherwise become too long and require costly additional bracing in order to stabilise them.
Low Headroom Doors as illustrated in Diagram 11 and 12 are generally used in situations where a concrete slab is found overhead and a headroom of not less than 180 mm but not more than that listed in the table for standard headroom doors is available.
Follow The Roof Doors
As illustrated in Diagram 15 below, the door top tracks are set parallel to the slope of the roof. This may be required in the presence of high-level gantry rails or the need for good clearance for vehicle traffic below. The tracks can be angled from 5 degrees up to a maximum of 30 degrees. The use of this method tends to increase cost as heavier springs are required to maintain the door in the open position.
NOTE: A minimum headroom of 450 mm is required, as shown above in Diagram 15, to allow sufficient headroom for the mounting of the torsion springs above the door head. The installation consultant should also note the need for a horizontal infill tray to provide a soffit to the opening.
The special “follow-the-roof” low headroom hardware makes use of a double track system and will cause a minimum height loss of 180 mm. A matching front panel for this height can be manufactured to the same specification as the door. Note that the torsion springs are mounted at the rear of the door’s intrusion into the building.
All sectional door panels are either roll-formed in steel, extruded in aluminium or formed of extruded sections. These processes ensure that wide panels can be constructed without vertical joints.
Panel A: Horizontally fluted, galvanised mild steel, roll-formed to design patent, 225 mm x 0.8 mm thick modules, linked together to form one 450 mm high hinged panel. These panels are available in standard G275 galvanised finish with a factory applied urethane enamel, finished to your colour choice or polyurethane exterior quality powder coating as per the PLASCON EPU range of colours. This panel type is suitable for use with vision panels (see Features & Accessories below).
Panel B: Horizontally fluted, galvanised mild steel, roll-formed to design patent, 225 mm x 0.8 mm thick modules, linked together to form one 450 mm high hinged panel. These panels are available in standard G275 galvanised finish with a factory applied urethane enamel, finished to your colour choice or polyurethane exterior quality powder coating as per the PLASCON EPU range of colours. Insulated 30 mm thick with proprietary brands or urethane or polystyrene which may either be self-finished with an internal foil backing or internally faced with a 0.6 mm galvanised panel. This panel type requires special application if vision panels are to be introduced.
Panel C: Aluminium extruded from a reserved die, size 225 mm x 2.0 mm thick modules, linked together to form one 450 mm high hinged panel. These panels are available in a milled finish, powder coated as per the PLASCON EPU range of colours or anodised as per the Hulett ANOLOK colour range. This panel type is suitable for use with vision panels (see Features & Accessories).
Panel D: Aluminium extruded from a reserved die, size 112 mm x 1.6 mm thick modules, linked together to form one 450mm high hinged panel. Insulated 30 mm thick with proprietary brands or urethane or polystyrene self-finished with an internal foil backing and internally faced with 1.6 mm aluminium panels. These panels are available in a milled finish, powder coated as per the PLASCON EPU range of colours or anodised as per the Hulett ANOLOK colour range. This panel type is not suitable for the introduction of vision panels.
Panel E: COROVIEW (Commercial & Industrial, and Residential) aluminium frames extruded from a reserved die, framed together with matching mullions and pressure locking, internal glazing beads all in line with the international Slim-Line specification. A maximum individual panel height of 550 mm and a minimum panel height 400 mm. Maximum centres for vertical mullions at 1,200 mm. Installation consultants should ensure that a vertical mullion is positioned centrally in the door’s width if it is to be electrically operated. Glazing beads are designed for use with 4 mm toughened glass or 1.6 mm aluminium infill panels. These panels are available in a milled finish, powder coated as per the PLASCON EPU range of colours or anodised as per the Hulett ANOLOK colour range. (Refer to the Universal Door Type Overview above).
Features & Accessories
- 0.8 mm Galvanised steel, with optional factory applied enamel powder-coat finish.
0.8 mm Galvanised steel, with insulating core and foil backing or optional internal 0.6 mm lining with optional factory applied urethane enamel or powder-coat finish.
2.0 mm Extruded aluminium in mill finish with optional powder-coat or anodised to ANOLOK range.
1.6 mm Extruded aluminium with insulation and foil backing or optional internal 1.6 mm lining in mill finish with optional powder-coat finish or anodised from ANOLOK range.
COROVIEW extruded aluminium framed panel doors complete with mullions and glazing beads in specified number of panels horizontally and vertically. Panels to be glazed or clad and mill finished with optional powder-coat finish or anodised from ANOLOK range.
Operation: Doors in excess of 3,000 mm high are fitted with reduction geared continuous hand chain operators or electrical operated. Doors of less than 3,000 mm high are fitted with pull-down cords for hand operation (chain operator optional if required).
Tracks: Roll formed of 2.0 mm galvanised steel and fixed to 2.0 mm standard or reverse mounting angles.
Rollers: Standard steel ball bearing race or optional 2RS rollers. The latter, whilst optional, is recommended for multi-user systems.
Mechanism: Torsion spring balancing mechanism comprised of ball race bearing plates, torsion shaft, helical wound computer designed torsion springs; cast alloy spring cones and cable spools, stainless steel lifting cables, buffer stops, adjustable roller brackets/ hinges and a shoot-bolt with padlocking eye.
General: All sectional doors are fitted with a neoprene compression gasket to the underside of the bottom panel. Anti-sag top-hat sections are fitted to rolled steel and extruded aluminium panel doors in accordance with width and wind pressure requirements based on South African coastal standards. In particular, severe wind zones should be pointed out when prior to installation.
Technical Drawing & Measurements - Sectional Doors