Roofing Materials Guide for Eastern Washington

Choosing the Right Roofing Material for Eastern WA

Eastern Washington’s climate presents specific roofing challenges: hot dry summers, cold winters, snow loads in higher elevations, and occasional ice dams. Here’s how the major roofing materials compare.

Asphalt Shingles

The most common roofing material in Eastern WA. Available in three-tab and architectural (dimensional) styles.

• 3-Tab Shingles — Economy option. 20–25 year lifespan. Less wind resistance.
• Architectural Shingles — Heavier, better wind rating (up to 130 mph), 30–50 year lifespan. Recommended for most Eastern WA applications.
• Impact-Resistant (Class 4) — Highest hail resistance rating. Can qualify for insurance discounts. Worth considering in hail-prone areas.

Metal Roofing

Growing in popularity across Eastern WA for both residential and agricultural buildings.

• Exposed Fastener Panels — Most economical metal option. Common on barns, shops, and agricultural buildings. Easy to install.
• Standing Seam — Premium option. Hidden fasteners, 50+ year lifespan. Excellent for snow shedding.
• Metal Shingles — Looks like traditional shingles, performs like metal. Good balance of aesthetics and durability.

Underlayment — Don’t Skip This

Underlayment is your secondary water barrier. Eastern WA code requirements vary by elevation:

• 15 lb. or 30 lb. felt — Standard underlayment for most sloped roofs.
• Synthetic underlayment — Lighter, stronger, and more moisture-resistant than felt. Recommended.
• Ice & Water Shield — Self-adhering membrane required at eaves, valleys, and penetrations. Critical in areas that experience freeze-thaw cycles.

Ice Dam Protection

Ice dams form when heat escapes through the roof, melts snow, and refreezes at the eaves. Washington State Energy Code requires a minimum 24″ wide ice barrier (ice & water shield) at all eaves. In higher elevations (Kettle Falls, portions of Colville area), consider extending coverage further up the slope.

Snow Load Considerations

Check your local jurisdiction’s ground snow load requirements before selecting materials. Eastern WA varies significantly — from 20 psf in the lower valleys to 50+ psf at higher elevations. Your roofing system must be designed to handle the load.

Need help estimating materials? Our team at any of our 3 locations can help you calculate what you need.