Storing a Trailer Outside for an Ontario Winter: Roof Checklist

Most roofs that leak in May didn’t fail in May. They failed in January, quietly, under snow, with nobody there to see it. A trailer that winters outdoors in Ontario is working every day of the season, whether it moves or not. The roof does most of that work. Here’s the checklist we give owners who want a parked unit to reach spring dry.

How do you get an RV roof ready for winter storage?

• Get the sealant checked and touched up while temperatures still let it cure. Everything else on this list comes second
• Wash the roof and clear leaves, needles, and sap from the surface, the slide-out roofs, and the gutters
• Bring the slide-outs in. A slide roof left out all winter is a snow tray with a seal along the top edge
• Photograph the whole roof from a ladder. In spring you’ll want to know what changed
• Check the vent lids and skylight domes for cracks. A yellowed, brittle lid is one hailstorm from a hole

Should you put a cover or a tarp on your RV for winter?

A fitted, breathable RV cover keeps UV, snow, and debris off the roof and lets moisture out. It’s the best option short of indoor storage, and it can add years to sealant life. A plastic tarp is the worst option, worse than nothing. It traps condensation against the membrane and chafes the lap sealant wherever it flaps in the wind. It’s also the most reliable way we know to grow mould in a stored unit. If a proper cover isn’t in the budget, leave the roof bare and manage the snow.

Whichever you choose, the cover goes on after the sealant check, not instead of it. A small crack in October spends five months under ice either way.

How much snow is safe on an RV roof?

Think weight, not depth. Powder in January is light. The same depth of wet March snow can weigh several times as much. A thaw-and-refreeze turns either one into ice that no roof rake will move. Clear it once it builds past a hand width, and always ahead of a warm spell. Use a soft-edged roof rake from the ground or a ladder, and pull the snow off rather than pushing it. Never chip at ice with anything hard, and never climb onto a snow-covered roof. A shovel on an EPDM roof leaves gouges that leak in spring.

Watch for signs the load has already stressed the structure. Ceiling panels sag or ripple, the entry door suddenly sticks, or new cracks show at the roof seams after a heavy fall.

Can an RV roof get ice dams?

Yes. Anywhere snow melts and refreezes at an edge can build a dam that holds meltwater against the seam behind it. On a trailer, that means the roof edges, the front cap transition, and the low side of a slide roof. Keeping the snow load down is most of the prevention. If a dam forms anyway, don’t attack it. Wait for the thaw and get the seam inspected, because meltwater that sat against a seam for a week has usually found a way in.

Why does freeze-thaw crack RV roof sealant?

Every shoulder-season night, meltwater in a hairline crack freezes and expands, prying the crack wider for the next cycle. Southern Ontario can run dozens of those cycles between November and April. That’s why sealant fails faster here than manufacturer estimates suggest. It’s also why the fall touch-up matters more than the spring one: it closes the crack before the cycling starts.

When should you inspect an RV roof after winter?

Book the inspection before the first trip, not after the first rain at the campsite. What winter opened is easiest to fix while it’s still a sealant job. If you sent us fall photos, the spring visit starts with a comparison rather than a search from scratch. A trailer that spent the winter outside needs that spring check most.