Will cedar siding rot in Vancouver's climate?

Cedar siding can absolutely hold up beautifully in Vancouver's climate — but only if it's properly installed, finished, and maintained. Left unprotected or poorly detailed, cedar will rot, and Vancouver's 1,200mm+ of annual rainfall gives it plenty of opportunity to do so.

Cedar is actually one of the best wood species for wet climates. Western Red Cedar, which is harvested right here in BC, contains natural oils (thujaplicins) that resist moisture, decay fungi, and insects. This is why it's been used on homes throughout the Pacific Northwest for over a century. The problem isn't the wood itself — it's usually the installation details or lack of maintenance that causes premature rot.

The Real Culprits Behind Cedar Rot

The most common failure points are end grain exposure, inadequate clearance from grade or rooflines, and missing or failed finish coatings. End grain — the cut ends of boards — absorbs water like a sponge. Any board end that isn't properly sealed, capped, or detailed will begin to deteriorate within a few years in Vancouver's climate. Similarly, siding that sits within 150-200mm of grade, decking, or roof surfaces will wick moisture continuously and rot from the bottom up.

The other major issue is the rain screen gap. In Vancouver, a rain screen assembly isn't optional — it's standard practice and required under the BC Building Code for good reason. This means your cedar siding should be installed over a drainage plane (building wrap) and a ventilated air gap (typically 10mm strapping), so any water that gets behind the siding can drain out and the cavity can dry. Cedar installed tight against sheathing with no drainage path is a rot problem waiting to happen.

Finishing and Maintenance

Bare cedar will grey and eventually check and crack if left unfinished. A penetrating oil-based stain or semi-transparent stain is the preferred finish in Vancouver — it soaks into the wood rather than forming a film that can peel and trap moisture. Solid stains and paints can work but require more diligent maintenance because any breach in the film allows water in and traps it. Expect to re-coat every 3-5 years depending on exposure — south and west-facing walls take the most UV and weather punishment.

Vancouver-Specific Considerations

In Metro Vancouver, building inspectors and envelope consultants pay close attention to cladding details — especially after the leaky condo crisis of the 1990s left a lasting mark on how this region thinks about moisture management. If you're re-siding an older home, it's worth having a building envelope professional assess the existing wall assembly before new cedar goes on. Fixing a moisture problem behind new siding is far more expensive than addressing it upfront.

Typical costs for cedar siding installation in Metro Vancouver run $12–$18/sq ft installed for standard bevel or channel siding, and $18–$28/sq ft for more detailed profiles or tongue-and-groove. Premium clear-grade cedar commands a higher material cost than knotty grades.

Bottom Line

Hire an experienced siding contractor who understands rain screen assemblies, proper flashing at windows and penetrations, and end-grain sealing. Ask specifically whether they'll be installing a drainage gap — if they look at you blankly, keep looking. Done right, cedar siding on a Vancouver home can last 40–60+ years with periodic maintenance.

Browse experienced siding contractors in our directory at the Vancouver Construction Network to find local pros familiar with BC's building envelope requirements.