In recent years, more and more homes experience thermal loss — heat escaping the dwelling. The result: heating bill up, comfort down. Insulating a leaky home is nearly pointless — air will keep passing through. Here are 3 tips that make a real difference before, during and after your caulking work. For the technical step-by-step, see our how to caulk properly guide.
1. Find the air leaks
Before you pick up the gun, audit. Strategic points to check: door thresholds and frames, roof access hatches, ventilation and plumbing ducts, kitchen hoods, mail slots, open fireplaces, masonry cracks.
Three fast techniques even inspectors use:
- Hand test: in cold weather, run your hand slowly 2-3 cm from the frame. A temperature difference = a leak.
- Candle test: move a flame along the joints. If it flickers, air is moving.
- Spider web test: spiders spin where air passes. It's a reliable biological indicator.
2. Test your existing joints
A joint that 'looks fine' from a distance can be dead to the touch. Take a screwdriver and poke each joint along its length: if it crumbles, cracks or peels off easily, it needs redoing. A healthy sealant stays soft and elastic — it must absorb the building's movement.
Also look for indirect signs: interior water marks, stained frames, excessive condensation, drafts. These symptoms often flag a weaker area that should be redone first.
The follow-up question — "how long will it last?" — has a clear answer in our article on caulking lifespan (with all the nuances). And if you're torn between spot repair and full replacement, the 5 signs that should alert you give you the decision threshold.
3. DIY or hire a professional
Caulking isn't rocket science — but it's tricky. On simple, accessible interior joints, a meticulous DIYer can get a good result. Four cases, however, warrant a pro:
- Height work: scaffolding, ladders, 2nd or 3rd floor façade — safety and insurance matter.
- Exterior on brick or aluminum: full old-sealant removal, right product for the substrate, right weather.
- Water-damage signs: a failing joint can hide an insulation issue or a rotting frame.
- Large volume: recaulking a whole house means 30 to 60 cartridges — a pro is faster, cleaner, and backed by a warranty.
A pro respects safety and environmental rules, uses premium sealants, and stands behind the work with a warranty. To review terms (pricing, warranty, LogisVert, service areas): see our FAQ or our caulking service page. We cover Longueuil and Greater Montreal.
Bonus: the right time to caulk
The effectiveness of caulking depends heavily on install-day weather. The rule of thumb: a clean, dry surface, free of frost and ice, and no rain during application. The minimum temperature depends on the sealant: latex needs above-freezing weather, while a professional silicone can be applied even in winter. No need to wait for spring if a joint is open.