Sticking, Swelling, Draughting: Tuning a Shed Door Through the Year

A shed door gets a rough deal. It is the only component of the building asked to swing, take a shoulder, absorb the wind, and stay watertight — all while sitting in the exact spot where rainwater naturally wants to gather. Timber being timber, it also swells in November and shrinks again in June, which means a door that was perfect in July can be a different object entirely by Bonfire Night.

So when yours starts catching, sticking or whistling, that is not necessarily failure. It is information. The trick is reading it in the right order, because most people go straight for the plane when the answer was a screwdriver all along.

Start with the calendar, not the toolbox

Before you touch anything, ask what time of year it is and what the door is doing. A door that jambs shut in January and swings freely in July is behaving normally for a softwood door in a British winter — you want the fit to be generous enough for the wet months, which means a millimetre or two of slack in the dry ones. If you plane it flush in February, it will rattle in August.

A door that sticks in summer, on the other hand, is genuinely too tight, and one that has never closed properly since the day it went up is usually a frame problem rather than a door problem.

Four symptoms, four different culprits

Rubbing along the whole latch side. The gap has closed because the timber has taken on moisture. Expect this from autumn through to spring. If the door still closes with a firm push, leave it — forcing the issue now creates a draughty door later.

Catching at the top of the latch side. This is a dropped door, and nine times out of ten the top hinge has worked loose. Look for screws that turn without biting.

Binding on the hinge side. The hinges are set too deep into the frame or the door, or the frame itself has twisted as the ground has moved. A short straightedge held across the frame will tell you which.

Water or daylight along the bottom. Not a swollen door at all, but a threshold and drainage question — more on that below.

The hinge is usually the guilty party

Hinges are cheap hardware doing heavy work, and they fail quietly. Before you adjust anything else, open the door and give each screw a turn. If one spins freely, the timber has stripped — take the screw out, push a sliver of hardwood and a dab of exterior glue into the hole, leave it overnight, and re-fix. It is a ten-minute fix that gets you another few years.

If the top hinge is sound but the door has still dropped, swap the top two screws for longer ones — 75mm or so — that reach past the frame and into the stud behind it. That single change pulls a sagging door back up more reliably than any amount of shimming.

Where the door has dropped only slightly, a washer or two behind the bottom hinge leaf pushes the bottom of the door out and lifts the latch edge. It is imprecise, but so is most of shed maintenance, and it is reversible.

Then, and only then, consider the plane

Planing is the one job you cannot undo, so take off less than you think. Mark the tight spot with a pencil, take a single pass, refit the door, and check again. A power planer removes material at a rate that surprises people; a hand plane and a bit of patience is the better match for a shed door in February, when you are probably shaving off next summer's draught.

Seal the bare timber immediately afterwards with the same treatment the rest of the shed has had. A freshly planed edge is an open door for water.

Seals: the right type in the right place

Draughts around a shed door are worth chasing, but the fix depends on where the air is coming in.

• Frame rebate (the stop the door closes against): a self-adhesive EPDM bubble or D-profile seal is the workhorse. Clean the timber, degrease it, and stick it on when the surface is dry — not on a damp November afternoon.
• Bottom of the door: a silicone blade seal screwed to the face of the door, sweeping the threshold, copes well with uneven ground. Brush seals are better for sliding or heavily uneven surfaces but let more air through.
• Sliding or double doors: brush pile in the meeting stile, plus a decent overlap.
• Top of the door: usually leave it. If you are heating a workshop, seal the sides and bottom and manage humidity deliberately with a vent rather than sealing everything and trapping moisture inside.

One caution for anyone running a heater or a machine in there: a fully sealed shed with no ventilation is a condensation trap and, with a paraffin or gas heater, a genuine risk. Draught-proofing and ventilation are not opposites — you want control, not elimination.

The threshold is where sheds actually leak

Most water gets in at the bottom, and almost none of it comes through the door face. It comes in as splash, as wind-driven rain running down the door and being pulled under it, or as a puddle sitting against the frame.

Three things sort the majority of cases. First, an upstand: the door should close against a raised threshold or water bar, not a flat strip of timber at ground level. Second, an overhang: the bottom of the door should sit a few millimetres proud of the threshold and finish with a drip, so water sheds clear rather than tracking back. Third, drainage: check that the ground outside falls away from the door and that the base isn't sitting below the surrounding soil. If the door frame is within 150mm of soil level, you have a rot problem in progress whatever you do to the seals.

An aluminium threshold with a built-in upstand and a rubber gasket is a genuinely worthwhile upgrade on a shed you use daily, and it costs less than replacing the bottom rail of a door in two years' time.

Knowing when to stop repairing

Repair makes sense while the door is sound timber that has moved, or good timber with tired hardware. It stops making sense at a few clear points: rot that has reached the mortise and tenon joints rather than sitting in the bottom corner; hollow-core or honeycomb doors, which cannot be planed or re-hung with any confidence; delaminated stiles on a cheap imported door; or a frame so twisted that no adjustment will bring the door square to it.

As a rough guide, if the repairs are going to run past half the price of a new door, buy the door. Replacement shed doors start around £60 for a standard ledged-and-braced softwood type and rise from there, and a new one arrives square, dry and ready to be sealed properly.

Either way, give the thing twenty minutes in spring and twenty in autumn. A door that closes with a quiet click in both directions is usually a shed that is doing fine everywhere else too.