Garage door panel replacement: matching profiles, colours and vintage doors

Someone reverses into the bottom panel of a sectional door, and the question is immediately whether you are up for one panel or a whole new door. The answer depends almost entirely on whether the panel can be matched, and matching is a three part problem: the profile, the colour and the hardware. Get all three and a single panel replacement is one of the best value repairs on a house. Miss any of them and you are looking at a mismatched door that will annoy you every single day. This guide explains how to work out which situation you are in before you spend anything.

Only sectional doors work this way

A sectional door is built from separate horizontal panels joined by hinges, so one damaged panel can be removed and replaced.

A roller door curtain is one continuous sheet. A dent halfway up rides through the barrel every cycle and cannot be swapped out in isolation, so a damaged curtain is usually a curtain replacement. A tilt door is a single slab, so damage is either repaired in place or the slab is replaced. If you are still choosing a door and repairability matters to you, that difference is one of the arguments in sectional versus roller versus tilt.

Step one: identify the door

Before anything else, find out what you have. Look for a compliance or manufacturer label, usually on the inside face of a panel near an edge, on the track, or on the top bracket. In Australia the common names are B&D, including Panelift and Firmadoor, Steel-Line, Gliderol, Dominator, Danmar, Taurean and 4Ddoors.

Then photograph:

• The full door from straight on, in daylight.
• A square-on close up of the panel profile, so the shape of the ribs and grooves is clear.
• The edge of a panel where you can see the section depth.
• Any label, no matter how faded.
• The hinges and the roller brackets.

Those photographs are what a supplier or an installer will ask for, and having them ready turns a week of back and forth into one message.

Step two: the profile

Profile means the pressed shape of the panel face. Manufacturers run families of profiles with names, and within a family there are variations in rib spacing, groove depth and panel height. Two doors that look identical from the street can be different products.

What to measure:

• Panel height. Sectional panels come in a small number of standard heights, and mixing them changes the whole door layout.
• Rib or groove spacing, centre to centre.
• The number of ribs per panel.
• Section thickness, measured at the edge.
• Whether the panel is single skin or insulated. An insulated panel is thicker and heavier, and mixing types changes the door's weight and therefore its counterbalance.

That last point is not cosmetic. A heavier replacement panel changes the spring requirement, which is why a panel job sometimes turns into a spring conversation. If it does, that work belongs with an installer, as set out in the torsion spring safety guide.

Step three: the colour

Colour is where most panel matching dies. Three separate problems stack up.

The range changes. Standard colour ranges are revised over the years. A colour that was current when the door was made may simply not be available now, and the closest current equivalent is often close but not identical.

Paint fades. Even a perfect colour match out of the factory will not match a door that has had a decade of Australian sun on it. A new panel in the correct colour next to weathered panels reads as new, particularly on darker colours and on north and west facing doors.

The finish differs. Woodgrain embossing, gloss level and texture all vary between products and over time.

What to do about it:

• Find the original paperwork if you can. The colour name is worth more than any photograph.
• If the bottom panel is the damaged one, a replacement usually looks better there than in the middle, because the eye reads the bottom of a door as the part that gets scuffed anyway.
• Consider repainting the whole door in one colour if the match is close but not exact. A uniform door in a slightly different colour looks intentional. A patchwork does not.
• On coastal doors, factor the corrosion specification into the replacement panel as well, since a standard panel in a marine environment will not age the same way as the rest of the door. That is covered in Colorbond garage doors and coastal corrosion.

Step four: the hardware

A replacement panel usually needs hinges, roller brackets and, if it is the bottom panel, bottom brackets. Do not assume the old hardware transfers.

• Hinge numbering matters on sectional doors, since different hinge numbers set the roller stem offset for different track positions. Fitting the wrong number puts the roller in the wrong place and the door binds.
• Bottom brackets are load bearing and are where the lifting cable terminates. That makes bottom panel replacement a job with the counterbalance load in it, not a bolt-off bolt-on.
• Check the rollers while the panel is out. If they are gritty or flat-spotted, do them at the same time, using the guidance in replacing garage door rollers.

When it is a vintage door

Older doors, discontinued profiles and doors from manufacturers that no longer trade are the hard cases. Options, roughly in order of preference:

• Second hand. Doors get removed intact all the time during renovations. A panel from a matching door of the same era is often a better match than anything current. Watch the panels category and set the search running rather than checking once.
• A whole used door. Sometimes it is cheaper to buy a complete matching second hand door for the panels than to chase one panel. Check the complete doors category.
• Repair rather than replace. A dent in a single skin steel panel can sometimes be pulled and filled acceptably, especially low on the door.
• Replace the door. If the profile is unobtainable and the door is old enough that the springs, cables and rollers are all due anyway, a new door is often the honest answer rather than a compromise.

Deciding

Add it up before you commit: the panel, the hardware, the freight, the labour, and any spring adjustment the weight change triggers. Compare that against a new door of the specification you actually want. If the door is otherwise sound and the match is good, panel replacement wins comfortably. If you are chasing a discontinued profile in a discontinued colour on a door that also needs cables and rollers, you are spending good money to keep a compromise.

To get it looked at properly, the installer and repairer directory lists businesses by state, and most will tell you from your photographs whether the profile is still available before they come out. Also check what is trading in the parts and spares category, because the person who removed a door exactly like yours last month is the person you actually need.

That works in reverse too. If you have replaced a door and the old panels are stacked behind the shed, somebody is hunting that exact discontinued profile right now. Listing them with the profile close ups and the colour name costs nothing and keeps a serviceable door on a house instead of in a skip.