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Fence and Deck Building & Repair Experts
Rot on a shed starts low. This Old House's Norm Abram says the ends of trim boards usually go first, because the grain wicks up water like a sponge. Probe with a flathead screwdriver and mark where the tip stops sinking in easily; that shows how far the rot runs. What you do next depends on the piece. Fine Homebuilding says the rotted bottom of a flat corner board or splashboard is usually easy to cut free and replace, while a punky sill is better replaced or repaired in place with epoxy. Epoxy has a temperature floor. Fine Homebuilding says the epoxy and the air generally need to be between 50 F and 90 F, and "if it's colder than 50 F, the epoxy won't set." A builder writing in the Journal of Light Construction waits until he is sure it will not dip below 50 F. That is 10 C. In a Niagara winter, an epoxy repair outdoors usually waits for spring. Cutting out a rotted trim end and fitting new wood uses no epoxy, so it does not have to wait. Build the replacement so it lasts. Family Handyman says untreated siding or trim too close to the ground will likely rot, and to use treated, durable material near grade. LP's installation instructions for its SmartSide trim and siding call for at least 6 inches (152 mm) between the siding and finish grade, and for every cut edge to be sealed. LP's own shed plan puts a length of metal flashing along the top of the horizontal trim over the door. Those are one maker's figures for its own product; follow the instructions for whatever trim goes on. On permits: under the Ontario Building Code, a shed of not more than 15 m2, one storey, not attached, used only for storage and with no plumbing is exempt from needing a permit (Sentence 1.3.1.1.(6), as printed in the Ministry's 2024 Building Code Compendium; we have not re-checked it against the October 1, 2026 edition). None of the sources we read says whether a door or trim repair on a larger shed needs one. Our shed permit guide has each town's rules; for a shed over 15 m2, ask your building department before re-levelling it or replacing framing.
A shed door that drags, sticks or will not latch has one of three causes: the hinges, the door, or the shed itself. Check them in that order, because each fix is bigger than the one before it. Family Handyman's advice for house doors runs the same way: tighten hinges and jambs first, with planing and sanding as a last resort. Start at the top hinge. Fine Homebuilding explains how a house door sags: as the screws in the top hinge loosen, the gap on the hinge side widens and the latch side closes "until the door starts to bind at the top." Its fix is new pilot holes and screws about 1 1/2 inches longer than the originals. Those are house doors, but a shed door hangs from its top hinge the same way. Next, check the door and the opening for square. This Old House's test for a gate works for any frame: measure diagonally from corner to corner both ways, and if the two measurements differ, it is out of square. Our gate repair guide covers squaring a gate. If the door is square and the opening is not, the shed has moved. That is a winter problem. The National Research Council's Canadian Building Digest on frost action says a detached, unheated building on frost-heaving soil can rise evenly and show nothing, but uneven heaving "is more usual," because soil and snow cover vary. Family Handyman warns that a shed set on a few concrete blocks will have problems "when the ground freezes, thaws and settles differently than when you first built the shed." A door that binds in January and swings free in May is pointing at the base, not the hinges. That is our reading of those two sources, not their words. If the base has moved, the fix is at the base, not the door. Swelling is the other seasonal cause. This Old House's Tom Silva says to plane a swollen door as little as possible, "because the door is going to shrink again in the winter," and to wait for the driest part of the year, then seal every surface, top, bottom, sides and inside face, with an oil-based primer and two coats of paint. Snow is the plain one. A Family Handyman writer who had hinged doors on a shed had to keep a large area in front of it clear of snow and ice "or the doors wouldn't open," and moved to sliding doors for that reason. Peter repairs shed doors and trim, alongside the decks, fences, pergolas and sheds he builds across Niagara. If a door drags or the trim has gone soft, send him a photo of the door closed, the hinge side, and the bottom corners of the shed through the contact details below, and say which town you are in.
If the door is square and the opening is not, the shed has probably moved. The National Research Council says frost usually lifts a small unheated building unevenly, and Family Handyman warns that a shed on a few concrete blocks shifts as the ground freezes and thaws. In that case the fix is at the base, not the door.
Check the top hinge first. Loose screws there let the door drop toward the latch side. Fine Homebuilding's fix for house doors is new pilot holes and screws about 1 1/2 inches longer. Then measure the door and the opening corner to corner both ways to see which one is out of square.
Only as little as it needs. This Old House's Tom Silva says the door will shrink again in the winter, and a door planed too much sits loose. In the driest part of the year, seal every face, including the bottom edge, with primer and two coats of paint.
Not outdoors in the cold. Fine Homebuilding says epoxy will not set below 50 F (10 C). Cutting out the rotted end of a trim board and fitting new wood can be done now.
A storage shed of 15 m2 or less that meets the other Building Code conditions is exempt from needing a permit. None of the sources we read covers door or trim repairs on a larger shed. Ask your building department before re-levelling or reframing one.
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