Washington Weather and Your Pole Barn: What to Consider

Washington weather is as diverse as the state is large. From the rainy coast to the snowy Cascades and the drier eastern regions, your pole barn needs to be engineered for your specific location's weather challenges.

Rain Management for Western Washington

Western Washington receives 40-60+ inches of rain annually. Managing this water is critical: Proper roof overhangs (12-24 inches) to protect wallsGutter systems sized for heavy rainfallSite grading to direct water away from buildingFrench drains for areas with poor drainageVapor barriers to prevent interior condensation

Snow Load Requirements

Snow loads vary dramatically across Washington: Puget Sound: 20-25 lbs/sq ft minimumCascade foothills: 40-60 lbs/sq ft recommendedMountain areas: 70-100+ lbs/sq ft may be requiredEastern Washington: 15-25 lbs/sq ft typical

Wind Rating Considerations

Washington experiences significant wind events, particularly along the coast and through the Cascade passes: Coastal areas: 100-110 mph wind ratingsPuget Sound: 90-100 mph typicalColumbia River Gorge: 110-120 mph recommendedInland areas: 85-90 mph typical

Moisture and Humidity

Western Washington's high humidity requires special attention: Proper vapor barrier facing interior is essentialAdequate ventilation prevents moisture buildupConsider closed-cell spray foam for humid climatesOverhangs protect walls from driving rain