Janesville Premium Roofing provides professional skylights in Janesville, WI for residential and commercial properties across south central Wisconsin. Cutting a new skylight into a Janesville roof is an alteration, and whether the state code follows it into your house depends entirely on when the house was built. That is not a technicality. It decides whether anybody reviews the framing you are about to cut through.
Above June 1, 1980 the opening falls under SPS 321.27 for roof design and framing, and under SPS 321.28 for the flashing, which requires flashing around all roof openings with no exceptions offered. That means a header sized for the span, rafters doubled at the sides of the opening, and a flashing kit installed to the manufacturer's instructions. That is a real review by a real inspector who has the authority to say no.
Below that date, SPS 320.05 puts alterations to pre-code dwellings outside the code entirely. You can cut two rafters in a 1954 Cape Cod, frame the opening with whatever happens to be on the truck, and nobody from the state or the city has standing to look at it. We have removed skylights that were installed in exactly that spirit. The rafters were cut, nothing was headed, and the ridge had started to sag.
So on older houses we run the framing calculation anyway and show you the arithmetic. Rafter span, existing member size, tributary load, header specification. If the span or the load says the opening needs an engineer we say so and we stop until you have one, even though nothing in the code is going to require it of either of us. We would rather lose the job than cut a structural member on a guess.
Flashing is where skylights actually leak, and it is nearly always the same failure. Somebody used sealant in place of a step-flashing kit at the sides, or set a curb-mount unit down on a deck-mount curb. We install the manufacturer's kit for that specific unit and that specific roof covering, with the head flashing carried under the course above it. Caulk is maintenance dressed up as a flashing detail, and it fails on schedule.
Honest advice on product: a fixed unit leaks less than a venting one because there is one less moving joint in it, and a venting skylight over a Janesville bathroom is mostly a way to add moisture to an assembly that already fights moisture. If you want ventilation there, put in a proper exhaust fan ducted outside and a fixed skylight above it.
Our licensed and insured team brings the right materials and equipment to every job — No. 15 asphalt-impregnated felt underlayment, ASTM D4869 Type I underlayment felt, ring-shank nails set into 1x6 board sheathing, No. 28 gauge open-valley sheet metal, 50-pound roll roofing in closed valleys, step flashing and masonry chimney crickets — and backs the work with a written workmanship warranty. We serve Janesville and nearby communities including Beloit, Edgerton, Milton, Evansville.
What We Handle
Everything our skylights in Janesville covers
One crew, one point of contact, and the full range of skylights work in Janesville, WI. If it is on this list we do it in house rather than handing it to a subcontractor:
- skylight installation Janesville
- skylight leak repair
- curb mount skylight
- deck mount skylight
- skylight flashing kit
- skylight replacement
- rafter header framing
- fixed versus venting skylight
- sun tunnel installation
- skylight condensation
Not sure which one describes your situation? Describe it in plain words and we will sort it out — or browse the rest of our Janesville services.
Materials, equipment and how we do skylights
The difference between skylights that lasts and skylights that gets redone in three years is almost always preparation and materials, not the finish you see on day one. We work with No. 15 asphalt-impregnated felt underlayment, ASTM D4869 Type I underlayment felt, ring-shank nails set into 1x6 board sheathing, No. 28 gauge open-valley sheet metal, spec them to the job instead of to the invoice, and write the material grades into the free estimate so you know exactly what you are buying.
Every Janesville job runs the same way: site walk and measurements, written scope and fixed price, protection of the surrounding area, then the work itself with a daily clean-up. Years of roofing work in south central Wisconsin means we have already met whatever your property is going to throw at us — awkward access, older construction, an HOA with opinions.
Where we do skylights outside Janesville
Janesville Premium Roofing covers Janesville and the surrounding communities of south central Wisconsin. Crews run out to the same nearby cities every week, so an out-of-town job does not mean an out-of-town price.
- Skylights in Beloit, WI — Rock County, population 36,657
- Skylights in Edgerton, WI — Rock County, population 5,945
- Skylights in Milton, WI — Rock County, population 5,716
- Skylights in Evansville, WI — Rock County, population 5,703
- Skylights in Clinton, WI — Rock County, population 2,221
- Skylights in Orfordville, WI — Rock County, population 1,473
Start on the Janesville Premium Roofing homepage for a free estimate, or call (844) 511-2320 and describe the job.
Why Janesville Chooses Janesville Premium Roofing
- ✓We pull the assessor's construction year before we price a roof, because June 1, 1980 decides whether the state code governs your reroof or your contract has to.
- ✓Our estimates name specifications rather than adjectives: No. 15 felt or a labeled ASTM D226 Type I synthetic, four fasteners per strip shingle, a two-inch head lap.
- ✓We count existing layers by lifting shingles at the rake and a valley, and the count goes in writing before anything is sent to your insurance carrier.
- ✓We go in the attic on every inspection. Fastener rust, valley staining and packed eaves show on the underside of the sheathing long before they show on top.
The standards behind skylights
Quality here is not a matter of opinion — it is written down. The skylights work we do in Janesville follows published industry standards: NRCA publishes the Roofing Manual, the industry's reference for details and slope minimums, and Asphalt Roofing Manufacturers Association sets the shingle application and ventilation guidance the warranties reference. If a contractor cannot tell you which standard a detail comes from, that is worth asking about before you sign.
Every skylights project in Janesville gets the same attention, whether it is a single room or a full commercial job. We show up on schedule, keep the site clean, and stand behind the work — the estimate is free and there is no pressure.
Ready to get started? Call (844) 511-2320 for a free skylights free estimate in Janesville, or request a quote and we'll get right back to you.