RV Sealants and Caulking: What to Use Where in Alberta

Sealant does not last forever anywhere, but Alberta stacks the odds against it. Strong high-altitude sun breaks down the surface, dry air saps its flexibility, and freeze and thaw cycles through spring and fall make the joints underneath expand and contract again and again.

Add hail, gusty wind that flexes roof edges and mouldings, and gravel roads that sandblast the front cap, and you get cracks, shrinking and gaps. These can open up long before the rest of the RV looks worn.

The trouble is that a failed seam rarely shows itself right away. Water slips in slowly and soaks into wood framing and insulation. By the time you see a stain or soft spot inside, the repair is much bigger than a tube of sealant.

Flat, horizontal roof surfaces usually get a self-levelling lap sealant. It flows out as it cures to cover screw heads and the edges around vents, skylights, antenna mounts and the front and rear roof seams. Do not use it on vertical walls, because it will run.

Sidewalls, end caps, window frames and trim use a non-sag sealant that stays where you put it. Under mouldings, windows and many exterior fixtures, manufacturers typically use butyl tape, a soft, sticky strip that compresses to form a gasket. When those parts come off, replace the old tape instead of reusing it.

Two rules matter more than any product. First, match the sealant to your roof material, since rubber, TPO and fibreglass roofs each need a compatible product. Your owner's manual or roof manufacturer will list what is approved. Second, avoid household silicone on the exterior. Most RV sealants will not stick to silicone residue, which makes every future repair harder.

Plan on a close look at every seam at least twice a year. In Calgary, spring de-winterizing and fall storage prep are natural times to do it. Also check after any hailstorm or a trip on rough gravel.

Look for cracks, edges pulling away, chalky or crumbling spots, gaps at corners and missing screws. You do not need to strip everything each time. You can often clean small problem spots and touch them up with fresh sealant over the old, as long as the new product is compatible and the old material is still well bonded.

A full strip and reseal makes sense when the old sealant is brittle, lifting, or built up so thick that new material cannot bond properly. How long a reseal lasts depends on the product, how much sun the RV sees and whether it is stored under cover. Let the condition of the seams guide you rather than a fixed date on the calendar.

Touching up a roof vent on a dry, mild day is a reasonable job for a careful owner. Sealant needs a clean, dry surface and suitable temperatures to cure, so check the product label before you start and skip cold or wet days. Be careful on the roof, and make sure it can support your weight before you walk on it.

Call us if you find soft spots in the floor or walls, bubbling on the sidewall, stains around windows or a musty smell. Those point to water that has already gotten in, and fresh sealant alone will not fix that. Our team at Horton RV Services in Calgary handles water leak repairs and structural damage repair, and once the damage underneath is fixed we can reseal it properly.