Metro Vancouver’s coastal climate means near-constant exposure to wind-driven rain, and even properly installed siding can trap moisture against the wall if there’s nowhere for that water to drain. A rain screen system solves this before it becomes a problem — it creates a ventilated air gap between your siding and the wall assembly, so any water that gets behind the cladding can drain and dry out instead of sitting trapped against your sheathing.
At Silver Siding, a rain screen system is a standard part of how we approach new siding installations, full reclads, and exterior renovations across the region — for single-family homes, strata complexes, and commercial buildings alike. Whether you’re replacing aging siding or planning a new build, getting this layer right is one of the most important decisions in the entire project: it’s what keeps the walls behind your siding dry, durable, and built to current expectations for moisture management.
A rain screen system works by creating a small, continuous air gap between the back of your siding and the wall’s water-resistive barrier. That gap is the entire point: when wind-driven rain gets past the siding — and with virtually every cladding material, eventually some does — it has somewhere to go. Gravity pulls it down the gap and out at the base, rather than letting it sit against the sheathing where it can soak in.
The same gap also allows air to move behind the siding. That airflow helps any residual moisture dry out faster, which matters as much in summer (when humidity gets trapped behind a tight-fitting wall) as it does during a wet winter.
Not all rain screen assemblies are built the same way, and the difference is worth understanding before choosing one for your project.
Which approach makes sense depends on the siding material, the wall assembly, and the specific exposure conditions of the building — not a one-size-fits-all decision.
Rain screen assemblies aren’t just a best practice in this region — for many new builds and full reclads, they’re a requirement under the BC Building Code, a standard that came directly out of the building envelope failures of past decades. For older buildings being re-clad or upgraded, bringing the wall assembly up to a proper rain screen standard is often one of the most valuable parts of the project, even when it isn’t strictly required by code.
Skipping or shortcutting this layer doesn’t usually cause an obvious, immediate problem. It shows up years later as trapped moisture, rot, or mould behind the siding — by which point the repair is far more invasive than the rain screen installation would have been.
The right rain screen approach depends on the type of building as much as the siding material:
One honest limitation worth naming: a rain screen system manages drainage and airflow behind the cladding, but it isn’t a substitute for correct flashing, window detailing, or an intact air and weather barrier underneath it. It’s one part — an important one — of a complete moisture-management strategy for the wall assembly, not a stand-alone fix.
| Service Area | Why This Service May Be a Good Fit | Local Considerations |
|---|---|---|
| Vancouver | A mix of older homes and active reclad projects throughout the city often makes a properly detailed rain screen worth prioritizing, especially where original wall assemblies were built without one. | Building age and lot exposure can vary block to block, so the right assembly depends on the specific property and siding material. |
| North Vancouver | Properties closer to the mountains can see more sustained moisture exposure, which may make a fully ventilated rain screen a stronger fit than a thinner drainage layer. | Treed lots and shaded sites can slow drying time behind the siding, depending on orientation and surrounding landscaping. |
| West Vancouver | Larger custom homes and full exterior renovations in this area can benefit from a rain screen detailed specifically for the project’s siding and wall design. | Elevation and proximity to the water may increase wind-driven rain exposure on some properties, depending on the site. |
| Burnaby | A mix of single-family homes and older multi-family or strata buildings here often makes rain screen retrofitting a relevant consideration during a reclad. | Building age and original construction standards vary widely, so existing wall assemblies should be assessed individually. |
| Richmond | Flatter terrain and a high concentration of multi-family and strata properties can make consistent drainage detailing especially relevant across a building. | Drainage performance can depend on lot grading and site-specific water flow, which is worth reviewing as part of any project. |
Wherever your property is located, the same underlying principle applies: water needs somewhere to go once it gets past the siding. What changes from one area to another is mostly the building type, age, and exposure — not the basic approach. We assess each property individually rather than applying a one-size-fits-all assembly across every job.
Most siding materials benefit from a rain screen, but the degree depends on how absorptive the material is. Fiber cement and wood-based products absorb and release moisture over time, so a ventilated gap behind them makes a real difference in how long the assembly lasts. With James Hardie siding, for example, a properly ventilated rain screen helps the material dry out between wet periods rather than holding moisture against the board. The same logic applies to metal siding — metal itself doesn’t absorb water, but condensation can still form on its back side, so a drainage gap gives that moisture somewhere to go instead of sitting against the sheathing.
Vinyl siding is a slightly different case: it’s installed with its own venting built into the panel design, but a rain screen behind it still adds a layer of drainage and airflow that the panel alone doesn’t fully provide, particularly on older wall assemblies being re-clad.
Stucco and EIFS-style wall systems use a different moisture-management approach altogether — they’re designed to manage water at the surface rather than behind a drainage gap. We don’t install stucco systems, but it’s a useful comparison if you’re weighing different exterior approaches for a project.
These two layers get confused often, but they do different jobs. A Tyvek air barrier wraps the sheathing to block air leakage and provide a secondary line of defence against water that gets past the cladding. The rain screen sits on top of that, creating the physical gap that lets any water reach the air barrier, run down it, and drain out — rather than pooling against it.
Neither layer replaces the other. A wall with only an air barrier and no rain screen can still trap moisture against that barrier over time; a rain screen with a compromised or missing air barrier underneath loses its backup line of protection. The two are meant to be installed as part of the same assembly, not chosen between.
This is also where rain screen systems differ from a sealed “barrier wall” or curtain wall approach, which tries to keep all water out at the surface with no drainage path at all. In a wet coastal climate, a drained-and-back-ventilated approach is generally the more forgiving of the two over the life of the building.
If you’d like to see examples of completed siding and exterior work, including projects where a rain screen system was part of the build, take a look through our gallery for a closer look at the finished results.
Before any drainage layer goes on, we inspect the existing sheathing and wall assembly for moisture damage, soft spots, or areas where water has already found a way in. A rain screen only performs as designed if it's built on a sound substrate — skipping this step is one of the most common reasons assemblies fail prematurely.
A weather-resistive air barrier is installed over the sheathing first. The drainage layer — strapping, battens, or a ventilated mat, depending on the siding and exposure — goes on next, creating the gap that lets water drain and air circulate behind the cladding. The right combination depends on the building, not a single default setup.
Flashing at windows, doors, and transitions is detailed so water entering the gap actually exits at the base instead of pooling at an interruption. We check that vents and weep points are clear and functioning before the siding goes on — this is the verification step that's easy to skip and expensive to fix later.
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A rain screen system is a ventilated air gap installed between exterior siding and the wall's water-resistive barrier. The gap allows any moisture that gets past the siding to drain downward and dry out through airflow, instead of becoming trapped against the sheathing. It's a standard part of how exterior walls are built in wet coastal climates.
For many new builds and full siding reclads, yes — rain screen assemblies are required under the BC Building Code, a standard introduced after widespread moisture-related building failures in past decades. For renovations or partial siding replacements, requirements can vary, so it's worth confirming the specifics for your project.
The system relies on two simple physics principles: gravity and airflow. Water that gets behind the siding drains downward through the gap and exits at the base of the wall, rather than pooling against the structure. At the same time, air movement through that same gap helps dry out any residual moisture before it can cause damage.
A ventilated rain screen uses a deeper gap, usually created with strapping or a thicker drainage mat, allowing both drainage and real airflow behind the siding. A non-ventilated system, sometimes called a drainscreen, uses a thinner layer that manages drainage well but allows little to no airflow. Ventilated systems generally perform better with absorptive materials like wood and fiber cement.
Yes. Adding or upgrading a rain screen system is a common part of siding replacement and reclad projects, especially on older buildings that were originally built without one. It's one of the most worthwhile upgrades to include while the wall is already opened up.
A correctly installed rain screen system is designed to last for the lifespan of the wall assembly itself, since it's a structural drainage layer rather than a wearing component. Its actual performance over time depends on the materials used, the quality of installation, and ongoing maintenance of the siding above it.
Not sure whether your current siding has a rain screen system behind it, or whether your upcoming project needs one? Reach out for a free, no-obligation assessment — we’ll walk through your specific building and siding plans before recommending an approach.
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