When should I replace versus repair bathroom caulking around a tub in a Vancouver home?

You should completely replace — not repair — tub caulking when you see any cracking, separation from surfaces, persistent mould that won't clean off, yellowing or hardening, or any gaps where the caulk has pulled away from the tub or wall tile. In Metro Vancouver's damp climate, compromised caulking is the single most common entry point for water to get behind tub surrounds and into wall cavities, where it causes mould growth and structural damage that's far more expensive to fix than a $15 re-caulking job.

Repair (spot-fixing) is almost never the right answer with caulking. Applying new caulk over old caulk doesn't bond properly — it adheres to the surface of the old caulk rather than to the tile and tub surfaces, and it fails again quickly, often within weeks. The only situation where a small repair might work is if you have a single, tiny nick in otherwise sound, well-bonded caulk that's less than a year old. In virtually every other case, full removal and replacement is the correct approach.

Here's when to replace. If the caulk is cracking — even small hairline cracks — water is already getting behind it. If the caulk has pulled away from either the tub edge or the wall tile, leaving any visible gap, water is flowing behind the surround. If mould appears on or within the caulk and doesn't come off with a bleach-based cleaner, the mould has penetrated into the caulk material itself and cannot be removed. If the caulk has turned yellow, hardened, or feels brittle when you press it with a fingernail, its flexibility is gone and it can no longer accommodate the natural movement between the tub and wall (tubs shift slightly with weight and temperature changes). All of these conditions call for full removal and replacement.

In Vancouver's climate, proactive replacement is smart. Even well-applied 100% silicone caulk typically lasts 3–5 years in a Metro Vancouver bathroom before the persistent humidity begins to degrade it. Rather than waiting for visible failure, inspect your tub caulking every 6 months and plan on replacing it proactively every 3–4 years. This $10–$15 tube of silicone and 45 minutes of your time prevents thousands of dollars in potential water damage.

How to do it properly. First, remove all old caulk completely. Use a caulk removal tool (a small hooked plastic blade, $5–$8) to cut and peel away the old material. A silicone caulk remover solvent such as Goo Gone Caulk Remover ($8–$12) softens stubborn residue. Scrape remaining bits with a plastic putty knife — never metal, which scratches tub and tile surfaces. Clean the joint thoroughly with rubbing alcohol to remove any soap scum, body oil, or silicone residue. The surfaces must be completely clean and dry for new caulk to bond properly.

Use 100% silicone caulk — never latex or acrylic latex. This is critical in Metro Vancouver's humid environment. Latex caulk absorbs moisture, supports mould growth, and fails within months in a wet bathroom environment. 100% silicone is waterproof, flexible, and far more durable. Choose a mould-resistant formulation (most major brands offer kitchen and bath silicone with built-in mildewcide) in white or a colour that matches your fixtures. Expect to pay $8–$15 per tube at Metro Vancouver retailers.

Apply the caulk in a steady, continuous bead along the joint. Tool it smooth with a wet finger or a caulk finishing tool within 2–3 minutes of application — silicone begins to skin over quickly. Remove masking tape (if you used it) immediately after tooling, before the caulk sets. Allow 24 hours of cure time before exposing the caulk to water. Run the exhaust fan during this period to keep humidity low and promote proper curing.

If you'd rather have a professional handle it, handyman services in Metro Vancouver typically charge $100–$250 to re-caulk a standard tub surround, including removal of old caulk and application of new silicone. This is a reasonable investment if you're uncomfortable with the process or want a perfectly clean finish.

The key takeaway: in Vancouver's damp climate, tub caulking is not a set-and-forget item. It's a consumable maintenance component that needs regular inspection and periodic replacement to protect the structure behind your walls.