Rain screen wall systems provide superior moisture management and durability, especially in cold and mixed climate zones. Learn the key design principles and best product options.
Overview
Rain screens are an exterior wall construction method that creates a ventilated drainage gap between the cladding and water-resistant barrier. They are especially effective in cold and mixed climates, where freeze-thaw cycles, snow loads, and vapor drive present serious moisture risks. This article breaks down key components of rain screen assemblies and recommends tested materials for long-term performance.
Core Design Principles
- Include an air gap of 3/8″ to 3/4″ behind cladding for drainage and ventilation
- Use furring strips, mesh mats, or proprietary mounting systems to maintain spacing
- Ensure the WRB is fully sealed and flashed behind the rainscreen cavity
- Include top and bottom ventilation and weep details
- Comply with local energy and fire codes, especially in multifamily or mixed-use buildings
🔍 Quick Picks
- Best Rainscreen Spacer: Cor-A-Vent SV-5 Starter Strip
- Best Drainable Housewrap: HydroGap Drainable Housewrap
- Best Furring Fasteners: GRK Cabinet Screws (for furring to sheathing)
🛒 Product Highlights
- Cor-A-Vent SV-5: Rainscreen starter strip that promotes drainage and ventilation behind cladding systems.
- HydroGap Housewrap: Drainable WRB layer that helps shed water and improves drying time in cavity walls.
- GRK Cabinet Screws: Durable fasteners ideal for attaching furring strips to exterior sheathing or studs.
🧱 Used In These Assemblies
- Wood-frame and steel-frame cold climate walls
- Multifamily rainscreen fiber cement facades
- Ventilated masonry veneer backup wall systems
❓ FAQ
Why are rain screens important in cold climates?
They allow trapped moisture to escape and prevent damage from freeze-thaw cycles and condensation.
Can I retrofit a rain screen?
Yes. Many cladding systems can be spaced off the wall with vertical furring, but careful flashing integration is essential.
🛠️ Related Articles
- Installing Rainscreens Over Exterior Sheathing
- Drainage Plane Material Options
- Building Envelope Strategies for Freezing Climates
Conclusion
Rain screen systems are a proven approach to durable, moisture-managed walls in cold and mixed climates. By allowing assemblies to dry and drain, they extend material life and improve energy performance. Select code-compliant products and proven installation methods for best results.
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