How important is caulking before we get the exterior of our house painted? Our painter mentioned it but it seems like an unnecessary extra cost?

Caulking before exterior painting is not an upsell or unnecessary extra. It is arguably the most critical prep step for protecting your home, especially in Metro Vancouver where we receive over 1,100 millimetres of rainfall annually. Skipping caulking is a false economy that leads to far more expensive repairs down the road.

Every gap around window and door frames, where siding meets trim, at corner boards, where different materials join, and around penetrations like light fixtures and hose bibs is a potential entry point for water. In Vancouver's driving rain conditions, water does not just fall vertically. Wind-driven rain pushes water sideways and even upward into gaps that might seem insignificant.

When water gets behind your siding or into wall cavities, it leads to rot, mould growth, and structural damage. Repairing rotted framing or sheathing costs thousands of dollars compared to the relatively modest investment in proper caulking.

A quality exterior caulking job uses paintable, flexible sealant rated for outdoor use and temperature movement. Silicone-modified polyurethane or high-quality acrylic latex sealants with at least a 25-year rating are standard. Your painter should remove any old, cracked, or separated caulking and apply fresh beads to all joints and transitions.

The caulking also gives your paint job a much more polished, professional finish. Gaps and cracks left uncaulked create shadow lines and uneven paint coverage that make even expensive paint look cheap.

Ask your painter to walk you around the house and point out every area they plan to caulk, so you understand exactly where your home is vulnerable and what protection you're getting.

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