Composite door problems: dropped, catching or sticking

How to tell it is the hinges and not the frame

Open the door fully and lift the handle end gently by hand. If you can feel or see a few millimetres of vertical play before it resists, that play is almost certainly in the hinges rather than the frame. Hinges wear at the pin and the moving leaf, and that wear shows up as the door dropping slightly on the handle side over time.

If instead the door has shifted so the whole frame looks out of square, for example a visible gap has opened at the top of the hinge side while the bottom has closed up, that points to the frame moving in the opening rather than the hinges wearing. Frame movement is more often linked to the surrounding brickwork or an old lintel settling than to anything wrong with the door itself.

Where a dropped door usually catches first

The top corner on the lock side is the classic spot, because that is the furthest point from the hinges and shows the smallest amount of drop most obviously. You will typically notice the door rubbing on the frame or the weather seal there before anywhere else, and in bad cases the multipoint lock will not throw properly because the keeps no longer line up with the hooks and rollers.

A door that has dropped enough to affect the lock is worth sorting quickly rather than living with, because forcing a stiff handle to lock a misaligned door is one of the more common ways gearboxes fail early.

Adjustments you can try yourself

Most composite door hinges, whether flag hinges or the more common cylindrical adjustable type, have small grub screws that move the door up, down, or side to side by a few millimetres using a 4mm Allen key. Winding these gradually, a quarter turn at a time, and testing the door after each adjustment, is safe on a door you own and is the same first step a fitter would take.

Work from the top hinge down, and check the closing action against the keeps after every change rather than adjusting all three hinges at once, because a small movement at the top hinge changes how the whole door sits.

• Identify the hinge type before you start (cylindrical hinges usually have a visible grub screw on the face)
• Adjust in quarter turns and re-test the door each time
• Start at the hinge nearest the problem area, then work outward
• Stop and call a fitter if the door still will not lock after modest adjustment

When adjustment will not be enough

Hinge adjustment has limits, usually a few millimetres in any direction, so a door that has dropped more than that will not fully correct with grub screws alone. That is often a sign the hinges themselves are worn out rather than just needing a tweak, and replacing hinges on a heavy composite door is a job worth having done properly so the weight is shared evenly again.

If the frame has actually moved in the wall, no amount of hinge adjustment will fix the underlying cause, and packing or refitting the frame is the real repair. Our fitters can tell the difference on-site in a few minutes and quote accordingly rather than guessing.

How to adjust a composite door that has dropped

Most composite doors use adjustable flag hinges. Each hinge usually allows a lift or drop and a side-to-side shift using an Allen key under a cover cap. Small adjustments, made evenly on every hinge, bring the door back to catching-free closing.

If the gap between door and frame is uneven along the top as well as the latch side, the frame itself may have moved, and hinge adjustment alone will not correct it.

Do composite doors warp?

A well-made solid-core composite door is designed to resist warping, but a dark door in full sun can flex slightly on hot afternoons and settle back in the evening. If the door sticks only on sunny days and is fine at night, heat is the likely cause rather than a fault.