RV roof maintenance and resealing: a practical inspection and resealing routine

Why roofs fail

RV roofs live a hard life: UV exposure, temperature swings, road vibration that flexes the body, tree branches, hail, and in Alberta, chinook freeze-thaw cycles that can swing temperatures dramatically in a single day. Sealants shrink, crack and pull away over time, and plastic vent covers turn brittle. Most manufacturers recommend inspecting roof seals regularly, often every few months or at least twice a year. Check your RV's manual and warranty terms, because some warranties require documented roof inspections.

Safety: Confirm your roof is walkable and stay on supported areas. Avoid working on wet, frosty or windy days. Use a stable ladder and a spotter. Sealant solvents can be flammable and irritating, so follow product labels and ventilate.

A simple schedule

Take photos each time. Comparing photos over time makes slow deterioration obvious, and they help with insurance claims.

Step 1: Clean

Use a cleaner made for your roof type and a soft brush. Avoid petroleum-based, citrus or abrasive cleaners unless the roof manufacturer approves them, as some damage EPDM and TPO membranes. Rinse thoroughly and keep runoff off the sides as much as you can, because chalky EPDM residue streaks paint.

Step 2: Inspect every seal

Work in a pattern, front to back. Check:

• Around each vent, fan, skylight, antenna, A/C unit, plumbing vent and cable entry.
• Along the front and rear cap seams and the edge trim.
• Screw heads that aren't fully covered.
• The membrane itself: tears, punctures, bubbles, loose sections, soft spots underfoot.
• Plastic parts: vent lids and frames, skylight domes. Check for chalkiness, cracking or hail dings.

Signs that sealant needs attention: cracks, gaps between the sealant and the surface, missing sections, or sealant that has gone hard and brittle. Light surface checking ("alligatoring") on otherwise well-bonded sealant is common. Many owners add a fresh, compatible layer over it.

Step 3: Choose the right sealant

• Horizontal surfaces (roof): self-leveling lap sealant compatible with your membrane. It flows to seal edges and screw heads.
• Vertical surfaces (walls, end caps): non-sag sealant that stays put.
• Under fixtures and window frames: butyl putty tape as a gasket.
• Don't use household silicone on RV roofs unless the manufacturer specifies it. Most other sealants won't stick to silicone residue later, which makes future repairs harder.

Step 4: Reseal

1. Remove loose or failed sealant with a plastic scraper. Leave well-bonded sealant if the new product is compatible.
2. Clean with the solvent or cleaner the sealant manufacturer recommends.
3. Apply a continuous bead that covers the joint and extends onto both surfaces. Self-leveling sealant will spread.
4. Cover every screw head.
5. Let it cure according to the product label. Watch for minimum application temperatures and rain-free cure times, which matter in Alberta's spring and fall.

Windows and side fixtures

Window leaks usually come from dried-out butyl behind the frame. Running sealant around the outside can buy time, but the proper fix is to remove the window, clean off the old butyl, apply new butyl tape and reinstall, tightening screws evenly without crushing the butyl flat. It's a manageable job for a careful DIYer with a helper. Have the interior trim ring and screws ready.

Roof coatings

Some owners apply a roof coating to older EPDM or fibreglass roofs. Coatings can extend life when they're properly matched to the membrane and the surface is well prepared, but they aren't a fix for soft decking or major tears. Check with the RV or membrane manufacturer before coating, because it may affect warranty.

Seals elsewhere

• Slide seals and door seals: Clean them and apply a rubber seal conditioner. Alberta's dry air ages rubber faster.
• Compartment doors: Check that gaskets compress evenly.
• Clearance lights: Small lights on the roof edges and caps often leak. Reseal or use butyl under them.

Winter considerations

Snow load on RV roofs can be significant after a heavy, wet storm. If you store outdoors, check the manufacturer's guidance on snow removal and use a soft roof rake or broom from a safe position. Never use metal shovels or scrape down to the membrane. Ice dams around vents are worth watching during chinook melt cycles. See RV storage tips for Calgary winters.

When to call a pro

Membrane replacement, soft or delaminated decking, extensive hail damage, or any job where you can't work safely at height.