Metal Roofing in South Bay, Washington — Lifetime Interlock® Aluminum Shingles Installed Locally
South Bay Metal Roofing Experts Installing Lifetime Interlock® Aluminum Shingles Since 1997
Metal Roofing Built for South Bay's Heavy Rain, Snow Loads, Windstorms & Lifetime Protection
Interlock Metal Roofing (PNW) Inc. is South Bay, Washington’s trusted metal roofing contractor, proudly serving local homeowners since 1997. As the exclusive authorized installer of Interlock® lifetime aluminum roofing systems, we deliver unmatched performance, beauty, and durability tailored to the unique climate of the Pacific Northwest. Our heavy-gauge, fire-resistant, and energy-efficient cool roofs are engineered to withstand South Bay’s heavy rains, coastal winds, and occasional snow, ensuring superior snow shedding and long-term protection. Whether you prefer the classic elegance of slate, the rustic charm of cedar shingles or shake, the Mediterranean appeal of tile, or the modern look of standing seam, our roofs combine timeless style with the proven strength of metal. Every installation is protected by the advanced Alunar® Coating System and backed by a Lifetime Warranty, making Interlock the best choice for roof replacement and re-roofing in South Bay, 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 ~1370 mm of rain a year
Corrosion Resistant
Aluminum won’t rust or corrode
- Authorized Interlock® installer serving South Bay homeowners and properties across Thurston County.
- Tested to 120+ mph (193+ km/h) for severe coastal windstorms and Puget Sound gust events affecting South Bay rooftops.
- Precision weatherproof seams (profiles: slate, cedar, shake, tile) and mechanical fastening (profile: standing seam) deliver long-term leak protection during wind-driven rain events.
- Aluminum is Coated with the Alunar® Coating System (no visible aluminum surface) for a durable, low-reflective finish suited to South Bay homes.
- Corrosion-resistant aluminum roofing engineered for marine exposure and salt air near South Bay’s shoreline neighborhoods.
- Built to shed heavy rainfall and resist wind-driven intrusion during atmospheric river events common to the South Bay region.
- Smooth, non-porous finish and continuous interlock reduce moss and lichen adhesion in South Bay’s damp coastal climate.
- Snow-shedding panel geometry minimizes accumulation and helps prevent ice dams during occasional freeze–thaw cycles.
- Class A fire-rated available for added protection during regional ember-risk periods and dry summer conditions.
- UL 2218 Class 4 impact resistance for protection against hail, falling branches, and storm debris typical of local windstorms.
- Energy-efficient cool-roof performance lowers summer heat gain and improves attic comfort during regional heat waves.
- Solar-compatible roof assemblies engineered for modern bracket-mounted photovoltaic systems on South Bay residences.
- Fully recyclable aluminum makes the system a sustainable choice for environmentally minded Thurston County homeowners.
- Architectural profiles replicate slate, cedar shake, and tile while offering standing seam options for technical performance and South Bay curb appeal.
- Low-maintenance construction designed to outlast asphalt shingles in South Bay’s high-moisture, coastal environment and backed by a Lifetime-Limited transferable warranty.
Metal roofing built for South Bay's climate
Averages (10-yr): ~1370 mm rain and 40 cm snow per year, ~2881 sunshine hours, mean 10.8°C, typical daily-max winds ~16 km/h with gusts to 99 km/h, and ~34 freeze–thaw days per year.
- 40 cmavg. snow / year
- 1370 mmavg. rain / year
- 34freeze–thaw days / year
- 99 km/hpeak wind gusts
- 2881 hrsannual sunshine
- 10.8°Cmean temperature
Interlock® aluminum roofing is engineered for these conditions — wind-rated to 193+ km/h (120 mph), UL 2218 Class 4 impact-rated, Class A fire-rated, and built to shed snow and resist ice dams and freeze–thaw cracking, backed by a lifetime limited warranty.
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 [email protected]
- Toll-Free 1-866-733-5811
- Customer Service [email protected]
- 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 South Bay, Washington
Interlock® Aluminum Roofing — all-climates performance specs for South Bay, 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 South Bay, 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 South Bay, WA
Every marker is a real, anonymized Interlock® aluminum roof completed by a Certified Interlock Installer. Explore verified Interlock® installations near South Bay, 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 South Bay on the interactive project map →Browse all Interlock® projects in Washington →See more Interlock® projects →
What our customers are saying:
They did a very good job! They did a good job. We have had a wind storm and rain, and no leaks.
There could be improvement regarding communication of what days they were working and what days they weren't. I wish I had gotten the roof years ago. It wasn't as a good a fit on our old house. We knew we wanted to do this house and we finally got the money together to do it. We are so glad we did.
Interlok Reps came across as high-pressured and as if trying to 'pull fast ones', like:----Demanding all homeowners be present for sales pitch, though I assured him we'd already been shown the product, only needed estimate and verification of materials; then if it looked feasible, then paperwork. ----Entire sales pitch felt high-pressured. ----We clearly and repeatedly stated, Interlok was far beyond our means to afford or finance, after they'd quoted prices, yet Reps continued to high-pressure and jig-figures by small amounts. ----Rep pulled out contract papers, despite being told we can't afford this; papers looked as if we needed a legal team to read and edit them, to have ANY hope of legal protections.Reps said a few things which conflicted with other statements in their pitch, as well as some bordering on sounding like scamming, like: ==="Standing seam roofing has fasteners that show"; Despite indicating our better-than-average knowledge of roofing and building, Reps emphatically tried to convince us of other metal roofing's inferiority by mis-stating facts, then changing subject. ==="Must include permit cost"; Our County does NOT require permit to replace roofing unless framing/structure needs fixed--ours does not: the roof deck is NOT considered structure for purposes of re-roofing. ==="We can roof-over the existing 2 layers of shingles to save you a big chunk off the price" ;But this was still more than double the cost of standing-seam; and, CODE:requires "must remove all old roofing if there is more than one layer of old roofing"...He knew this Code requirement to start with, stating it clearly at the beginning, then tried to buffalo us that we could get away without removing old roofing, after it was made clear to him YET AGAIN, that cost was crucial, and that we could NOT afford this: Conclusions: 1. He intended to bait-and-switch, and/or do an illegal job. 2. If he so easily used these tactics, what else was lied about or misled about?Cost, function and honesty trump Cosmetics. Notes re: realty/housing industries in general:The Interlok Reps came on the heals of our being sold a money-pit. We'd already gone deep into debt to repair/replace basic infrastructure which should have been done before being put on the market. Realtors and affiliated industries extensively use deceptive descriptives and practices to artificially pump prices, all over three counties we looked in; this was the best one we could find, and it was misrepresented and over-priced. The cunning, clever ways the various industries work together regarding real estate, allows each separate industry to appear mostly guiltless. "House flippers" routinely cover up infrastructure issues with cosmetics, and make more mistakes of their own which also need fixed. "Instant equity" appears to be a housing industry Secret Code for: "this is how much we KNOW it will take to fix things we're not telling buyers about, which can't be seen by inspectors buyers pay for, or items which are marginal or fall through Code cracks". Honesty, accountability and responsibility take a back-seat to getting fast money, at most levels, at least to some degrees. Better changes need made, but in today's sick business climate, that's not likely to happen fast enough to prevent more new homeowners losing their homes related to these issues. Too many industries, in every sector, have predatory and/or destructive practices which they continue to rationalize and excuse, to maintain business-as-usual. We'd also already been blitzed with questionable to shady contractors prior to Interlok Reps arrival, therefore sensitized to any hints of questionable business practices. More varieties of contractors and businesses have been knocking on our door and spamming our mail since then.
Factory to installers communication, shipping, and their materials breakdown was the only problem we really had. The roof was pretty much wide open for about two weeks exposed to the elements. Loan company used, a pain to work with
The Interlock associate Ivan,came did an awesome service in correcting the part needed to be corrected, he left us with instructions of what we needed to check and to get in touch with, if needed 😀 Ms. May the associate answering the phone was helpful for us to get prompt service. They are dependable. We received roof service.
Dear Interlock Roofing, Thank you for coming by and installing a new roof on our house. After we first talked at the Tacoma Home Show in January, both Paul and Ross were fantastic in walking us through the process and explaining the roofing system when we met in February. They answered all our questions, and we were eager to get started. Patrick and Drew took the lead with the installation planning and paperwork, and once the materials were ready in May, Patrick dropped them off at our house. The three-man crew installed everything in three days and ensured any installation questions were answered and done properly. In the end, we love the look and expected longevity of our new roof.
By far the best purchase we’ve made for our home. Patrick and Greg were amazing! Installation was quick and there wasn’t any mess left behind. If you have ever thought about getting a metal roof Interlock Roofing is hands down the best!
The cost of the roofing was too high. It looks very nice and glad I had it installed. I have one leak, but I haven't called them about it yet.
The sale experience was good, but the rest was far below expectations, especially for the price paid. We did not buy Interlock just for an attractive roof, we bought it because they are supposed to be experts, have a high level of customer services, and we thought would do things right without headaches. This is far from the case. Hire an company who's actual employees and managers will be on site, not Interlock. Turns out we were actually blindly hiring a crew, who sub-contracts for Interlock, and has a questionable level of experience. Interlock doesn't even show up at your job site at any time during the job, even if you have problems and repeatedly ask them to. Once they have your money at the end of the job, they don't care if you still have issues or even bother to respond to you when you have additional issue. They need an interlock staff member who is an installation expert to be on the job site ideally for the whole job, but at the least, at the start at the middle and at the end who can insure everything is done to high standards and that all of the customers issues are addressed promptly. Paying by the job is also super problematic, this only encourages the crews to work as fast as they possibly can, covering up or ignoring things that might take a bit longer. They have no incentive to fix or give the customer time to fix an issue. The one installation manager you have for a huge region is not even close to adequate, it's no surprise he could not give us an adequate level of communication or attention. Disappointing.
Their workers are very good and very capable. Fewer supply problems. Joe, the scheduler. He does an exceptional job keeping his customers happy and meeting schedules considering supply and covid issues. Always nice and courteous.
They fell short with the roofing underlayment material. The type of boards they actually used. Maybe since they used one over another, they probably need to be more clear and advise the customer who chooses. It is something we noticed. Contact from the company for rescheduling could've been better. I understand delays are unforeseen, but keeping better communication with consumers so they aren't taking time off and then finding it wasn't necessary to do so due to a delay. They were quick to request a referral, which I gave them a good one online, but they were slow when it came time to take care of the damage done. They probably should've waited to ask for the referral until after they had repaired the damage. Now, we feel hurried for a great referral, but they are taking their time to come back for the damage. I look forward to recommending them. This project was referred to us by friends in the midwest. I hope the company follows through on the $500 referral.
Nearby service areas in Thurston County
Interlock® metal roofing is also installed in these communities near South Bay:
Interlock Metal Roofing (PNW) Inc. also services nearby States
Beyond South Bay, our team installs Interlock® metal roofing across:
Metal Roofing FAQs for Homeowners in South Bay
The following metal roofing FAQs are designed specifically for homeowners in South Bay, Washington. Whether you are building a new home or replacing an existing roof, understanding how roofing materials perform in local weather conditions is essential. From wind and storm protection to fire resistance, hail impact, snow loads, and coastal moisture exposure, Interlock’s Lifetime Aluminum Roofing System is engineered to provide long-term durability, energy efficiency, and peace of mind in South Bay.
How does a metal roof handle South Bay's 40 cm of annual snow and freeze-thaw cycles?
Aluminum's smooth surface sheds snow efficiently, and the four-way interlocking panels prevent ice dams from forming where water backs up under shingles. South Bay experiences about 34 freeze-thaw days per year—the freeze-thaw cycles that crack and curl asphalt and wood shingles. Aluminum expands and contracts predictably without degrading; it won't split or curl. The lightweight design (Slate profile installs at 0.41 lb/sq ft) means no snow load reinforcement is needed, and panels interlock so tightly that water cannot penetrate even when snow melts rapidly.
Does an aluminum metal roof leak in South Bay's heavy rainfall?
No. South Bay receives about 1370 mm of rain annually, and Interlock panels are designed for exactly these wet Pacific climates. The four-way interlocking system creates a continuous mechanical seal—water cannot flow sideways between panels. When installed over solid deck with underlayment, as specified in ICC-ES ESR-1790, the roof performs identically to asphalt in rain protection. The roofing-grade 3105-H24 aluminum alloy does not absorb water, and the Alunar 70% PVDF coating (warranted 30 years) prevents any moisture degradation. Installation over existing roofs is common here and eliminates tear-off waste.
Will an aluminum roof rust in South Bay's wet climate near salt air?
Aluminum itself cannot rust because it contains no iron—the element that oxidizes in steel. Instead, aluminum develops a thin, self-healing oxide layer that actually protects it. In South Bay's maritime climate with winter gusts to 99 km/h and wet conditions, this passive defense is critical. The Alunar 70% PVDF fluorocarbon finish is applied to BOTH sides of every panel (extra protection against salt air and coastal conditions), and it's warranted 30 years against fading and chalking per ASTM D4214. Steel roofs must be painted repeatedly or they rust; aluminum requires zero rust maintenance.
Do I need to reinforce my home's structure for a metal tile roof?
No structural reinforcement is needed. The Interlock Mediterranean Tile profile weighs only 0.59 lb/sq ft—about 96% lighter than concrete or clay tile—so it installs directly over most existing roofs without additional framing. South Bay's typical gusts reach 99 km/h, and the wind warranty of 120 mph holds even at this light weight because the four-way interlocking system locks panels together, distributing wind load across the entire roof. Many homeowners in the region simply install over their existing asphalt, eliminating a costly tearoff and the asphalt landfill burden entirely.
How strong do metal roof panels need to be for South Bay wind gusts?
South Bay's typical wind gusts reach 99 km/h (about 60 mph), but the Interlock warranty covers wind speeds up to 120 mph when installed to specification. The four-way interlocking aluminum panels lock together mechanically, so no single gust can lift or separate them. Each panel is roofing-grade 3105-H24 or 3003-H24 aluminum alloy, rated UL 2218 Class 4 for impact resistance (the highest available). This same locking system that protects against hail up to 1.5 inches also distributes wind load across the entire roof plane, making it far more resilient than nailed-down shingles.
What warranty comes with an Interlock metal roof, and how long will it actually last?
The Guardian Warranty is a lifetime limited, non-prorated material warranty for the original owner covering rust, rot, splitting, cracking, curling, and impact resistance. It's one-time transferable: the next owner receives 50 years of coverage from completion. Most homeowners never reach the roof's actual lifespan because asphalt typically fails in 15–25 years due to UV degradation and thermal cycling. Interlock panels installed since 1998 in Delta, BC still perform at original specification. South Bay's 2881 sunshine hours and 34 annual freeze-thaw days stress roofing materials, but aluminum's fatigue resistance and the Alunar coating (warranted 30 years) handle these cycles indefinitely.
Is a metal roof more expensive than asphalt over 40 years?
Asphalt's apparent bargain disappears when you account for two or three replacements over 40 years. Interlock is installed once. The initial cost is higher, but you eliminate asphalt tear-offs (labor and landfill), avoid the 15-year replacement cycle, and never pay for reroofing labor again. South Bay's 1370 mm annual rainfall and freeze-thaw stress accelerate asphalt degradation. Current regional financing offers no payments and no interest until Spring 2027 or 10% off the installation price. Over a typical homeowner's tenure, metal roofing costs far less per year of service. Add the transferable 50-year warranty and the next owner's peace of mind, and the lifetime value becomes even stronger.
How much maintenance does an aluminum metal roof require in the Pacific Northwest?
Virtually none. Unlike asphalt, which requires sealant reapplication and shingle replacement, or wood, which needs regular staining and rot inspection, Interlock aluminum requires only occasional debris clearing (leaves, branches). The Alunar 70% PVDF coating doesn't degrade in South Bay's 2881 annual sunshine hours or its wet winters; it's warranted 30 years against chalking and fading. The roofing-grade 3105-H24 aluminum alloy and self-healing oxide layer resist the region's 34 freeze-thaw cycles without splitting or curling. No caulking fails, no fasteners corrode, and no structural wood rots beneath the roof. CALGreen verification acknowledges this reduced-maintenance performance, lowering your home's operating costs.
Can I save money on cooling costs with a reflective metal roof in South Bay?
Yes. energy-efficient Interlock colors achieve solar reflectance up to 0.55 and thermal emissivity of 0.84, rated by the Cool Roof Rating Council. In summer, when South Bay experiences 2881 sunshine hours per year, reflective coatings bounce solar heat away rather than absorbing it (as asphalt does). This reduces attic and living-space temperatures, lowering air-conditioning load. The benefit is measurable even in the Pacific Northwest's temperate climate. Winter is equally important: high emissivity releases stored heat at night, preventing ice dam formation during freeze-thaw cycles. The reflective properties persist because the Alunar finish is warranted 30 years against fading, so energy savings don't diminish over time.
How is an aluminum metal roof installed, and can it go over my existing roof?
Yes, installation typically proceeds directly over existing asphalt or wood shingles, eliminating costly tearoff labor and landfill waste. The installer lays solid deck and underlayment (required per ICC-ES ESR-1790), then fastens interlocking panels in courses, much like shingling—straightforward work that most skilled crews complete in one to three days depending on roof size. Because the panels weigh as little as 0.41 lb/sq ft (Slate), no structural reinforcement is needed, even when installing tile profiles. South Bay's rainy climate benefits from fast installation; the four-way interlocking design ensures weathertightness immediately. Interlock Metal Roofing (PNW) Inc. has served the region since 1997 and knows local conditions intimately.
Is a metal roof a good choice for South Bay’s climate?
Yes. South Bay averages about 40 cm of snow, 1370 mm of rain, roughly 34 freeze–thaw days a year, with peak wind gusts near 99 km/h. Interlock® aluminum roofing is wind-rated to 193+ km/h (120 mph), UL 2218 Class 4 impact-rated and Class A fire-rated, and its four-way interlocking panels shed snow and resist ice dams and freeze–thaw cracking — all backed by a lifetime limited, transferable warranty.













