Metal Roofing in National, Washington — Lifetime Interlock® Aluminum Shingles Installed Locally
National Metal Roofing Experts Installing Lifetime Interlock® Aluminum Shingles Since 1997
What do Interlock customers in Washington say?
Interlock has 734 published customer reviews from Washington, covering installations reviewed between 1999 and 2026. They average 4.7 out of 5, with 669 collected through independent GuildQuality surveys. Interlock® Slate is the most frequently installed system in the region, appearing in 287 of these projects. Across the surveys that scored individual categories, quality of materials rates highest at 4.9 out of 5.
Metal Roofing Built for National's Heavy Rain, Snow Loads, Windstorms & Lifetime Protection
Interlock Metal Roofing (PNW) Inc. is the trusted local metal roofing contractor and exclusive authorized installer of Interlock® lifetime aluminum roofing systems in National, Washington. Since 1997, we have helped homeowners protect their properties with heavy-gauge, fire-resistant, and energy-efficient roofs engineered for the unique weather challenges of the Pacific Northwest. Our Interlock Lifetime Roofing System is the best choice for National, WA, thanks to its superior snow-shedding capabilities, resistance to moss and algae in our damp climate, and unmatched durability against wind and rain. Choose from slate, cedar shingles, shake, Mediterranean tile, or standing seam styles—all protected by the advanced Alunar® Coating System and backed by a Lifetime Warranty. For roof replacement or re-roofing, trust Interlock Metal Roofing (PNW) Inc. to deliver beauty, performance, and long-term protection for your home in National, Washington.
Performance you can measure (all climates)
Weather Resistant
Tested to 193+ km/h (120 mph) winds
Durable
Lifetime-Limited, transferable warranty
Energy Efficient
Reflective cool-roof lowers cooling costs
Rain & Moisture Proof
Repels ~1315 mm of rain a year
Freeze–Thaw Durable
Endures ~42 freeze–thaw days a year
- Aluminum panels coated with the Alunar® Coating System (no visible aluminum surface) for a durable, color-stable finish suited to National roofs
- Precision weatherproof seams (profiles: slate, cedar, shake, tile) and mechanical fastening (profile: standing seam) deliver long-term leak protection during wind-driven rain events
- Interlocking panel system tested to 193+ km/h (120+ mph) to withstand severe coastal windstorms and Puget Sound gusts common near National
- Corrosion‑proof aluminum resists coastal moisture and salt‑laden air for National properties on Pierce County shorelines
- Advanced waterproof installation designed to shed water during atmospheric‑river downpours and extended wet seasons in National
- Moss‑resistant finish and profile geometry reduce biological growth on damp coastal roofs around National
- Snow‑shedding metal panels minimize accumulation and lower ice‑dam risk during occasional snow loads and freeze–thaw cycles in Pierce County
- Class A fire‑rated available to improve ember resistance during dry, elevated wildfire‑risk periods in nearby forested areas
- UL 2218 Class 4 impact resistance for protection against hail, falling branches, and storm debris
- Energy‑efficient cool roof performance to reduce heat gain during summer heat waves and improve attic comfort in National homes
- Engineered for straightforward, bracket‑mounted solar integration without compromising roof integrity or warranty
- Fully recyclable aluminum supports sustainable building choices for Pierce County homeowners
- Premium architectural profiles that replicate slate, cedar shake, tile, and standing seam for regionally appropriate curb appeal in National
- Low‑maintenance finish designed to outlast asphalt shingles in the Pacific Northwest’s high‑moisture environment
- Backed by a Lifetime‑Limited transferable warranty to protect long‑term investment and resale value for National residences
Metal roofing built for National's climate
Averages (10-yr): ~1315 mm rain and 57 cm snow per year, ~2953 sunshine hours, mean 10.4°C, typical daily-max winds ~14 km/h with gusts to 103 km/h, and ~42 freeze–thaw days per year.
- 57 cmavg. snow / year
- 1315 mmavg. rain / year
- 42freeze–thaw days / year
- 103 km/hpeak wind gusts
- 2953 hrsannual sunshine
- 10.4°Cmean temperature
Roof performance depends on the selected profile, tested assembly, roof structure and installation details. Class A fire-rated assemblies are available. Confirm applicable ratings in the testing reports and review the limited warranty before selecting a system.
Interlock Metal Roofing (PNW) Inc.
- 5608 17th Ave NW suite 1574, Seattle, WA 98107, United States
- Phone 206-589-8423
- Local lines Bellevue 425-225-4805 · Bellingham 360-502-4018 · Tacoma 253-352-2725 · Stanwood 206-202-7814 · Vancouver 360-873-5878
- Sales & Marketing sales@washingtonmetalroofing.com
- Toll-Free 1-866-733-5811
- Customer Service pnwservice@interlockroofing.com
- www.WashingtonMetalRoofing.com
- License WA #INTERMR75406
- Serving Washington since 1997 — 28 years
Hours
- Monday9:00 AM – 5:00 PM
- Tuesday9:00 AM – 5:00 PM
- Wednesday9:00 AM – 5:00 PM
- Thursday9:00 AM – 5:00 PM
- Friday9:00 AM – 5:00 PM
- SaturdayBy appointment
- SundayBy appointment
Interlock Metal Roofing (PNW) Inc. – Washington is a trusted metal roofing contractor proudly serving homeowners and businesses throughout Washington State. With decades of experience in the roofing industry, Interlock has built a reputation for unmatched quality, reliability, and customer satisfaction. As a specialized installer of premium aluminum and standing seam metal roofs, Interlock is an exclusive authorized installer of top-tier roofing systems designed for performance, longevity, and weather resilience — specifically engineered for the Pacific Northwest climate. Founded on principles of craftsmanship and integrity, Interlock Metal Roofing (PNW) Inc. has completed thousands of roofing projects with precision and professionalism, earning the loyalty of customers from Seattle to Spokane. Our team is known for timely project delivery, transparent communication, and exceptional workmanship, backed by robust warranties and industry-leading materials. Interlock’s commitment to excellence has been recognized through local and regional industry awards for safety, quality, and customer service. We stand out for our rigorous training standards, OSHA-certified crews, and adherence to best practices in roofing performance and installation safety. Whether it’s a residential metal re-roof, commercial roof installation, or custom architectural metal roofing, Interlock Metal Roofing (PNW) Inc. brings trusted expertise, lasting product solutions, and an unwavering focus on client satisfaction. Homes and businesses throughout Washington choose Interlock as their go-to metal roofing specialist because we deliver durable, high-performance roofs that stand the test of time.
Recognition GuildQuality Guildmaster Award — verified customer satisfaction (GuildQuality)
Accredited BBB Accredited A+
Get a Free Metal Roof Estimate in National, Washington
Interlock® Aluminum Roofing — all-climates performance specs for National, Washington
| Spec / Rating | Climate / Risk Factor + What It Solves |
|---|---|
| Wind resistance: 120+ mph (193+ kph) | Extreme wind, hurricanes, storm uplift: full interlocking attachment helps prevent blow-offs, edge lifting, and panel loss in high-gust events. |
| Fire rating: Class A (with proper assembly) | Wildfire, embers, radiant heat, chimney sparks: non-combustible roof assembly provides the highest residential fire protection rating. |
| Hail resistance: UL 2218 Class 4 | Hail and impact debris: highest impact classification; resists cracking, splitting, and surface loss common with asphalt under hail strikes. |
| Snow & ice performance: interlocking, shedding profile | Heavy snow, freeze-thaw, ice dams: smooth aluminum sheds snow efficiently and the interlocking design helps block water intrusion when melt-refreeze cycles occur. (Final snow-load capacity depends on roof structure and local code.) |
| Corrosion resistance: aluminum (won’t rust) | Salt air, coastal humidity, wet climates: aluminum naturally resists rust and corrosion, reducing long-term failure risk in marine or high-moisture environments. |
| Heat / UV durability: baked-on coating system | High heat, intense sun, thermal cycling: coatings resist UV breakdown and temperature-swing fatigue, slowing fading and surface degradation. |
| Moss / algae resistance: smooth coated surface | Wet shade, organic growth: low-porosity metal surface gives moss/algae less to grip, reducing staining and maintenance. |
| Material: heavy-gauge aluminum roof profiles (Slate / Shake / Shingle / Tile / Standing Seam) | All-season structural stability: lightweight, dent-resistant metal system stays stable through large hot-cold swings and severe weather. |
| Expected lifespan: 50+ years | Long-term durability across climates: avoids re-roof cycles typical of shorter-life materials, even in high-stress environments. |
| Warranty: Lifetime-Limited, non-prorated + 50-year transferable | Lifetime protection + resale value: guarantees long-term material confidence and transfers to future owners. |
Available Profiles in National, Washington:
Explore all Interlock® metal roofing systems, or see the Guardian lifetime warranty and independent testing reports.
Recent Interlock® roofs across Washington
Completed Interlock® metal roofs near National, WA
Every marker is a real, anonymized Interlock® aluminum roof completed by an Interlock Installer. Explore verified Interlock® installations near National, Washington, United States on the interactive project map and photo grid — filter by roof profile (Slate, Cedar Shingle, Shake, Mediterranean Tile, Standing Seam, Solid Copper), colour and year of completion.
Open National on the interactive project map →Browse all Interlock® projects in Washington →See more Interlock® projects →
What our customers are saying:
I recommended someone. There was a rot in a board in my roof; the installation crew did not replace it and did not mention anything to me. I spoke to the instillation manager, Randal, and he said that the installation person would come back(This was a week ago).Ten minutes ago, I tried to call him and he did not answer. I am still trying to contact Randal, to replace the rotten wood. I am going to try to recommend people when ever I can; everyone asks about my roof when they see it.
Of the five name brand roofing contractors I screened for this project I chose Interlock and I am very pleased with the roof. Coordination and communication was critical especially since Interlock was to perform the installation immediately following another contractor performing a siding replacement.
Most of the other contractors had out that I was screening for the project covered a lot more as far as the structure and insulation as well as how the roof was a system as a whole and not just a shell. I didn't get as much information from Interlock.
We are completly satisfied with the work and love our new roof. If you have any doughts about spending the money on this roof don't think twice, it is well worth the money. I wasn't there at the time
Nearby service areas in Pierce County
Interlock® metal roofing is also installed in these communities near National:
Interlock Metal Roofing (PNW) Inc. also services nearby States
Beyond National, our team installs Interlock® metal roofing across:
