GDO Pro 20mm Horizontal Wide Rib (32 Colour Options) garage door Steel GDO

GDO Pro 20mm Horizontal Wide Rib

The GDO Pro 20mm Horizontal Wide Rib is a premium insulated side-hinged steel garage door featuring wide horizontal ribs for a sleek, modern aesthetic. This double-skinned door provides superior strength, thermal insulation, and security compared to single-skin alternatives, with panels bonded to a thermal core forming a robust 20mm-thick leaf.

Made to measure up to 2750mm wide and 2340mm high, it arrives pre-assembled with a factory-fitted box-section steel sub-frame for straightforward installation. Available in 32 stipple-effect powder-coated colours (with white as standard), it supports 50:50 and 1/3:2/3 split options, inward or outward opening, and left or right-hand configurations at no extra cost.

Key Features

• Precision-machined components with concealed shoot bolts on the inactive leaf, cable-driven latches, and an optional 3-point locking upgrade for enhanced security.
• Colour matched, 3-way adjustable external hinges (2 to 3 per leaf), lever handle with deadlock, internal thumb-turn, and a threshold strip with double seals for excellent weather protection.
• UK-manufactured with a durable powder-coat finish and a U-value of approximately 2.8 W/m²K, ensuring energy efficiency for workshops, integral garages, or everyday use.

This doorset ensures easy daily operation, structural integrity, and a clean look, making it the ideal solution for properties requiring frequent pedestrian access or home-integrated garages.

When you are ready to order, simply choose the 'up to' size that covers your opening, and then enter your exact structural measurements into the ordering fields. From there, you can configure your door using the options provided. If you have any special requirements, such as needing the doors to open inwards, or if you just want to check the latest pricing and specifications, please feel free to email or call our team.

Factory Fitted Sub Frame
To ensure the easiest possible installation, your GDO Pro 20 doorset is delivered fully assembled with the aluminium fixing sub frame factory fitted as standard. This all in one construction guarantees accurate panel alignment straight out of the factory.

3 Point Locking
For an added level of security, a three point locking system featuring twin hood locks is available as an optional upgrade.
Please note: Minimum height over frame required is 1600mm.

Hinges
All heavy duty hinges come colour matched to your chosen door finish and are fully adjustable in three directions, allowing for fine tuning and perfect alignment of the door leaves on site.

Seals
Double seals fitted to both the door leaf and the frame help to protect your garage interior against the weather, while effectively limiting dust and debris from entering the space.

Handle Options
Customise the look of your doorset by selecting from our premium handle finishes. Options are available in Bronze effect (dark brown appearance), Gold effect, or Satin effect to perfectly complement your chosen door colour.

Matching Pedestrian Side Doors
If your garage features a separate side entrance, we offer matching pedestrian doors built to the exact same high quality, double skinned insulated specification as your main garage doors. Available in widths up to 1320mm and heights up to 2340mm, these side doors feature the same vertical rib design, handle options, and robust deadlock arrangement, ensuring a perfectly consistent aesthetic across your property.

Door Stays
Friction door stays are now fitted as standard at no extra charge, preventing the doors from blowing shut in the wind.

Colour Options
Personalise your garage door with a choice of 32 colour options. The paint finish features a highly durable powder coat ripple texture, providing an attractive appearance alongside excellent resilience against the British weather.

Choose from the classic low gloss solid colours below:

STANDARD FOC COLOURS:
White RAL9016
Black RAL9005
Grey RAL7016

PREMIUM COLOURS:
Signal Grey RAL7004
Dusty Grey RAL7037
Traffic Grey RAL7042
Light Grey RAL7035
Window Grey RAL7040
Basalt Grey RAL7012
Pebble Grey RAL7032
Iron Grey RAL7011
Slate Grey RAL7015
Graphite Grey RAL7024
Agate Grey RAL7038
Black Grey RAL7021
Steel Blue RAL5011
Cobalt Blue RAL5013
Sky Blue RAL5015
Gentian Blue RAL5010
Signal Blue RAL5005
Light Blue RAL5012
Moss Green RAL6005
Fir Green RAL6009
Chartwell Green BS14 C 35
Ruby Red RAL3003
Traffic Red RAL3020
Chocolate Brown RAL8017
Clay Brown RAL8003
Mahogany Brown RAL8016
Light Ivory RAL1015
Cream RAL9001
Traffic Yellow RAL1023

3 Point Locking
For an added level of security, 3 point locking with twin hood locks, is available as an option. 
Minimum height over-frame 1600mm.

Hinges
All hinges come colour matched and are adjustable in 3 directions for ease of alignment of the leaves.

Handle Options

Available in Bronze effect (dark brown appearance), Gold effect or Satin effect options. 

Seals
Double seals to the door leaf and frame help protect against the weather and limit dust and debris entering your garage 

Door Stays Are now fitted as standard at no extra charge.

Colour Options
Available in a choice of 32 colour options, the paint finish is a highly durable powdercoat ripple texture giving an attractive finish and excellent resilience.

Choose from the classic low gloss solid colours as below:
STANDARD FOC COLOURS:
White RAL9016
Black RAL9005
Grey RAL7016

PREMIUM COLOURS
Signal Grey RAL7004
Sudty Grey RAL7037
Traffic Grey RAL7042
Light Grey RAL7035
Window Grey RAL7040
Basalt Grey RAL7012
Pebble Grey RAL7032
Iron Grey RAL7011
Slate Grey RAL7015
Graphite Grey RAL7024
Agage Grey RAL7038
Black Grey RAL7021
Steel Blue RAL5011
Cobalt Blue RAL5013
Sky Blue RAL5015
Gentian Blue RAL5010
Signal Blue RAL5005
Light Blue RAL5012
Moss Green RAL6005
Fir Green RAL6009
Chartwell Green BS14 C 35
Ruby Red RAL3003
Traffic Red RAL3020
Chocolate Brown RAL8017
Clay Brown RAL8003
Mahogany Brown RAL8016
Light Ivory RAL1015
Cream RAL9001
Traffic Yellow RAL1023

Handle Options
Doors come with a chrome handle as standard and are also available with Brass, Black, White, Aluminium or Brushed Stainless Steel finish options.

Installation Guidance for GDO Pro 20 Doorsets

One of the biggest advantages of the GDO Pro 20 insulated side hinged garage door is that it is delivered fully pre-assembled. The insulated door leaves come factory hung within their heavy duty aluminium sub frame, eliminating the need for complex assembly on site. This "all in one" approach significantly reduces installation time and ensures factory accurate tolerances from the start.

While full, detailed manufacturer fitting instructions are provided with the door, the standard installation process follows these key steps:

1. Preparation and Checking

Before removing your old garage door, carefully measure your new GDO Pro 20 doorset and check it against your structural opening to ensure it will fit. Make sure the floor where the threshold will sit is solid and completely level; an uneven floor can cause the doors to catch or prevent the weather seals from working effectively.

2. Positioning the Doorset

Because the doors and frame are pre-assembled, they should be offered into the structural opening as one complete unit. Keep the door leaves closed and locked during this stage to keep the frame rigid. Use plastic packers or timber wedges between the aluminium frame and the brickwork to hold the doorset securely in place. Use a high quality spirit level to ensure the frame is perfectly plumb, square, and level.

3. Fixing the Frame

Once you are completely satisfied that the frame is perfectly upright and square, drill through the aluminium fixing sub frame and into the structural opening. Secure the frame using appropriate masonry frame fixings (not supplied). It is important not to over tighten the fixings, as this can bow the aluminium frame and pinch the door leaves.

4. Securing the Threshold

The doorset features a built in threshold that must be firmly fixed to the floor. Ensure a line of sealant is applied beneath the threshold before final fixing to prevent water from tracking underneath into the garage.

5. Testing and Final Adjustments

Once the frame is fully secured, unlock and open the door leaves to check their operation. They should swing smoothly without catching. If slight adjustments are needed due to the opening being slightly out of square, the GDO Pro 20 features heavy duty 3-way adjustable hinges. These allow you to finely tune the position of the door leaves in three directions for a perfect, even gap and smooth lock engagement.

6. Perimeter Sealing

Finally, once the door is operating perfectly, apply a high quality exterior silicone sealant around the entire perimeter gap between the aluminium frame and the brickwork to ensure the installation is completely weather tight.

Please note: We always recommend downloading and reading the full official installation manual prior to beginning work.

Installation instructions can be found here

2-year Product guarantee

The standard guarantee of 2 years is given to the holder of the product that covers all parts and the panel providing the serial number is readable, intact and in place.  Factory applied paint finishes are 2 years on steel doors that have standard colours applied. 

The product is given a 2 year warranty for hinges and locking for normal use whereby normal use consists of no more than 5 operations (open/close) per day. We recommend the product is inspected and serviced annually by a competent engineer from the garage door industry, the warranty for parts replaced by an engineer or for supply only is 6 months or for the remainder of the warranty period. If warranty work is carried out the product guarantee does not extend past the anniversary of installation/ supply date. 

* Terms and conditions apply, full details can be found here

Minimum & Maximum Ordering Sizes