The Last Roof Quote: a fixed price to Never Re-Roof Again.

Interlock Industries (Midwest) Inc., trading as Interlock Metal Roofing – Wisconsin — the certified and exclusive installer of the Interlock® Lifetime Roofing System in Wisconsin. The entity was incorporated in May 2001 and has been BBB-accredited since October 2001; the first Wisconsin roofs went on in 2003, and there are 602 on record now. The system itself is manufactured in North America by Interlock Roofing Ltd. Wisconsin line: (414) 348-8870.

Roseville, Minnesota. There is no Wisconsin office, and we say so plainly because a lot of roofing websites do not. Crews and paperwork come from the entity's Roseville office — about four hours to Madison, four and a half to Milwaukee — and they have been making that drive for over twenty years. The service area is ten counties in the south and east of the state.

Ten counties in the south and east of Wisconsin: Milwaukee, Waukesha, Washington, Racine, Kenosha, Walworth, Rock, Dane, Jefferson and Sheboygan — the Milwaukee metro (Milwaukee, Wauwatosa, West Allis, Greenfield, Waukesha), Madison and Dane County, Watertown and Jefferson County, Racine, Kenosha, Janesville and Sheboygan. Green Bay, the Fox Valley, Eau Claire, Hudson and the Northwoods are outside the current service area; if you are there, call and you will get a straight answer rather than a visit we cannot keep.

About 30 to 90 minutes at your house. We measure the roof, look at the attic insulation and ventilation, ask about ice dams and any past hail claims, work out where the snow guards need to go, and hold the profile and color samples against the house in daylight. You get a fixed price in writing. It does not expire on Friday and there is no pressure to decide on the spot.

No, and we will not tell you otherwise. Ice dams form when heat escaping through the roof deck melts snow that then refreezes at the cold eave — an insulation and ventilation problem that shows up as a roofing symptom. A smooth interlocked aluminum roof helps: it sheds sooner, and it does not rot when water backs up behind an ice ridge. But no roof covering eliminates ice damming, and it is a stated exclusion in the Guardian warranty. If your house dams now, the fix starts in the attic, and we will look at it with you at the estimate.

Interlock aluminum is UL 2218 Class 4 impact rated, verified via Intertek, — the highest rating a roof covering can hold: a 2-inch steel ball dropped twice on the same spot with no crack in the panel. Very large hail can leave a cosmetic mark on any metal roof; the panel keeps its integrity and keeps shedding water. That is the difference from asphalt, where the same storm means granule loss, a claim and a replacement. Ask your carrier what a Class 4 roof does to your premium and to the cosmetic-damage terms of your policy.

Almost certainly, because the roof covering is the light part. Interlock aluminum weighs 0.4–0.7 lb per square foot depending on profile — a fraction of asphalt at about 2.5 and slate at about 10 — so it adds almost nothing to what your framing carries when a winter's snow, or a lake-effect dump off Lake Michigan, is sitting on it. The structural question is the snow load your framing was designed for, which is set by code for your county, not by the covering. A smooth interlocked surface also sheds rather than accumulates, so the sustained load is lower than on a shingle roof.

It comes off sooner and in smaller amounts than off a roof that holds a whole season and lets go at once. That is a benefit and a design decision: snow guards go over entries, walkways, decks, the driveway and anything parked below, specified at the estimate for the pitch and the plane above them — not added after something has already been hit.

Freezing on its own does very little to any roof; freezing and thawing is what finishes asphalt. Water works into the shingle's fiberglass mat, freezes, expands and delaminates it from the inside, through forty-odd cycles a Wisconsin winter. Aluminum has no mat and absorbs nothing, so the cycle has nothing to act on. The panels expand and contract through the temperature range and the four-way interlock is designed to let them move rather than fight it.

Interlock panels lock to each other on all four sides with the fasteners concealed, so there is no exposed screw head to back out through freeze-thaw and no free tab edge for a summer derecho or straight-line wind to lift. Wind resistance is warranted to 120 mph installed to manufacturer specification. Asphalt fails at the tab edge, which is why wind damage shows up as missing shingles.

Heavy-gauge aluminum panels, up to 95% recycled content, formed as Slate, Cedar Shingle, Shake, Mediterranean Tile, Standing Seam or Solid Copper profiles, that interlock on all four edges with concealed fasteners into the deck. Finished in the Alunar® coating system in designer colors. Manufactured in North America by Interlock Roofing Ltd. since 1983. Class A Fire Rated Available as a complete assembly. Minimum 3/12 roof slope on every profile.

No. Aluminum has no iron, so it cannot rust — at a cut edge, a fastener hole or anywhere else. Steel roofing depends on its coating; every cut exposes bare metal the factory finish never reached. That is why the panels are aluminum and why the finish warranty and the material warranty are separate documents.

Yes. The system is solar compatible, and a roof that will outlast the array is the right order to do things in — on an asphalt roof the panels come off and go back on at every re-roof. Mounting is done to the manufacturer's specification so the warranty stays in force beneath the array.

The Guardian Lifetime Limited Warranty covers the original homeowner for life, is not prorated, and transfers once to the next owner, who is covered to 50 years from substantial completion (transfer registered within 60 days; $300 fee). Wind is warranted to 120 mph installed to manufacturer specification, hail to 1.5-inch stones, and the Alunar® coating for 30 years. Read the exclusions: ice damming is one of them. We hand you the full document, not a summary.

Once. The second owner is covered to 50 years from the original completion date, provided the transfer is registered within 60 days of the sale ($300 fee). A buyer's inspector discounts a roof that is nearly due; this is the opposite of that, and it is worth mentioning in the listing.

More than asphalt on the day, and we do not publish a price per square, because it would be fiction. A Wisconsin roof price depends on pitch, complexity, tear-off, what is under the old covering, how the eaves are detailed for ice, and whether a hail claim is in play. We measure the roof and give you a fixed number in writing that does not move afterwards. The arithmetic that matters is against your second and third asphalt roof, not the first.

Some Wisconsin carriers do, some do not, and the terms vary — including whether cosmetic hail damage stays covered. UL 2218 Class 4 is the rating insurers look for, and Interlock carries it under an Intertek listing we will show you. Ask your own carrier before you sign anything; we will not quote a number on their behalf.

Yes. Financing on approved credit for Wisconsin customers, with monthly, bi-weekly and weekly payment schedules, arranged at the time of purchase through independent third-party lenders. We do not print a rate on the website because rates and terms change; you get the current terms in writing with your estimate. Interlock does not lend money or make credit decisions.

Most Wisconsin municipalities require a building permit for a re-roof on a one- or two-family home under the Uniform Dwelling Code, and the contractor pulls it. Wisconsin has no roofing license as such; what a permit requires is that the contractor hold Dwelling Contractor certification from the Department of Safety and Professional Services (DSPS). At the estimate we tell you in writing who will pull your permit and under which credential, so you can check it on the DSPS lookup before anything is signed. The permit and the inspection are handled for you and included in the written price.

Search the DSPS credential lookup at dsps.wi.gov by company name and read the status and expiry date, not just that a number exists. Ask for the certificate of insurance to come from the insurer directly. And after a hailstorm, remember that Wisconsin law (Wis. Stat. § 100.65) prohibits a contractor from offering to pay or waive your insurance deductible and gives you the right to cancel a storm-damage repair contract if your insurer denies the claim — a company that offers to eat your deductible is telling you how it operates.