How do you know an RV roof needs resealing?
Cracked or lifting lap sealant, a chalking membrane (the roof’s outer skin), patch-on-patch repairs, or simply age. Freeze-thaw pries every crack wider, so sealant fails here faster than the brochure says. One or two tired beads are a spot repair. Cracking at most penetrations, chalk streaks down the sidewalls, or layers of old patches mean the whole roof is due.
How often should you reseal an RV roof in Ontario?
Inspect the sealant every spring and fall, and touch up what you find. There’s no honest fixed schedule for a full reseal, because storage matters as much as age. A trailer that winters indoors or under a good cover can go years longer than one open to the sky. In Ontario, lap sealant at penetrations usually needs work every few seasons, sooner than manufacturers suggest. Solar mounts, racks, and antenna brackets count too. They’re the newest holes in the roof and often the first to leak.
How roof types compare for resealing
Your roof membrane decides which cleaners, primers, and sealants will stick, so we identify it first. The wrong product is a common cause of failed reseals.
| Roof type | How it ages | Resealing approach |
|---|---|---|
| EPDM rubber | Chalks and streaks, grows brittle at seams | De-chalk, EPDM-safe primer, lap sealant and coating |
| TPO | Surface cracking and seam separation with age | TPO-compatible cleaner and products, seam focus |
| Fiberglass (fibreglass) | Gelcoat oxidation, crazing, hairline cracks | Repair cracks first, then a compatible sealant or coating |
| Aluminum | Seam and fastener leaks, oil-canning | Seal seams and fasteners, coat where suitable |
What does a professional RV roof reseal include?
Prep is most of the job. Coating over dirt, chalk, or failed sealant just schedules the next failure. The order:
- Inspect and photograph the full roof
- Remove failed or excess old sealant
- Clean and de-chalk the surface (wash off the white, oxidized layer)
- Repair problem areas first
- Prime where the product calls for it
- Tape seams and high-risk spots if needed
- Apply two coats of liquid rubber if the roof qualifies
- Photograph the finished roof
How long does a professional reseal take?
A spot reseal of penetrations and seams is usually a half day. A full prep-and-coat visit is usually a full day, or two with heavy sealant removal or a slow first-coat cure. Weather sets the schedule more than the roof does. In Ontario, full coatings run late spring to early fall and stop once nights turn cold.
Is it too late in the season to reseal?
Usually not for spot sealing, often yes for a full coating. For lap sealant, go by the minimum temperature printed on the tube, and allow hours of dry weather before rain. Coatings need longer, warmer dry spells. Late in the fall, we seal the entry points that would sit under ice all winter. The full reseal or coating waits for spring.
What resealing does and does not fix
Resealing protects a sound roof. It doesn’t fix rotted sheathing (the plywood deck under the membrane), soaked insulation, or structural damage. Those get repaired first, and we’ll show you photos if we find them, so you’re not paying twice. Resealing also isn’t coating. Resealing seals the seams and penetrations, while coating adds a new layer over the whole membrane. Many roofs need the first. Only some qualify for the second.
How much does it cost to reseal an RV roof in Ontario?
There’s no flat rate, and a price given before anyone sees the roof is a guess. Final pricing depends on roof size, roof condition, prep requirements, travel, access, visible damage, and hidden damage found during inspection. So we start from photos or an inspection.
| Factor | Why it moves the price |
|---|---|
| Roof size | More surface is more material and more labour |
| Roof condition | Chalking, failed sealant, and prior repairs add prep |
| Prep required | Prep is most of the job; removal and cleaning vary widely |
| Travel and access | Distance, site access, and setup affect the visit |
| Visible damage | Repairs found up front are scoped into the estimate |
| Hidden damage | What the inspection uncovers below the surface |
You see the full estimate before any work begins. Nothing gets done that you haven’t approved, and the number doesn’t change without your say-so.