Janesville Premium Roofing provides professional flat & low-slope roofing in Janesville, WI for residential and commercial properties across south central Wisconsin. Below the slope where shingles work, the Uniform Dwelling Code stops giving instructions and hands the job to the manufacturer. SPS 321.28 says other roof coverings are installed per the manufacturer's instructions or a nationally recognized standard, and that is the whole of the rule.
On a Janesville house that usually means a porch roof, a rear addition or a dormer connector, and it means the written specification is the only enforceable document anywhere in the transaction. On a post-1980 house an inspector can hold a contractor to the manufacturer's sheet. On a pre-1980 addition nobody can hold anyone to anything at all. So the specification is not paperwork. It is the entire protection you are buying.
So we write the membrane spec into the contract by name. The material, the thickness in mils, the attachment method, the seam technique and the flashing height at every wall and curb. EPDM in 60 mil covers most residential low-slope work here, TPO where the roof is visible and reflectivity matters, and the attachment is chosen for the deck rather than for our convenience. Anything we can name, you can hold us to.
The old failure mode on these roofs is not the field. It is the transition where the low-slope meets the shingles above it, and the wall flashing where an addition ties back into the house. Rolled asphalt lapped four inches up a wall and buried in cement is the classic pre-code Janesville detail, and it lasts roughly a decade before it starts weeping.
Ponding gets measured honestly. The section requires roofs to be designed and constructed to assure drainage of water, and on a settled 1950s addition that is often no longer true no matter what covering goes on top. Tapered insulation or a re-pitched deck costs real money, so we quote it as a separate line and let you see the choice you are making. Water that cannot leave will find a seam eventually.
If your low-slope roof is holding water and you came in expecting a simple membrane swap, we will tell you the swap buys five years and the drainage fix buys twenty-five. Some people take the five. On a house you are about to sell that is a perfectly legitimate decision, and we will do the work without a lecture attached. It is your house and your timeline, and we will price both options honestly.
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 flat & low-slope roofing in Janesville covers
One crew, one point of contact, and the full range of flat & low-slope roofing work in Janesville, WI. If it is on this list we do it in house rather than handing it to a subcontractor:
- flat roofing Janesville
- low slope porch roof
- EPDM rubber roof
- TPO membrane roof
- 60 mil EPDM
- ponding water roof
- tapered insulation
- addition roof membrane
- membrane seam detail
- rolled roofing replacement
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 flat & low-slope roofing
The difference between flat & low-slope roofing that lasts and flat & low-slope roofing 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 flat & low-slope roofing 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.
- Flat & Low-Slope Roofing in Beloit, WI — Rock County, population 36,657
- Flat & Low-Slope Roofing in Edgerton, WI — Rock County, population 5,945
- Flat & Low-Slope Roofing in Milton, WI — Rock County, population 5,716
- Flat & Low-Slope Roofing in Evansville, WI — Rock County, population 5,703
- Flat & Low-Slope Roofing in Clinton, WI — Rock County, population 2,221
- Flat & Low-Slope Roofing 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 flat & low-slope roofing
Quality here is not a matter of opinion — it is written down. The flat & low-slope roofing 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 flat & low-slope roofing 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 flat & low-slope roofing free estimate in Janesville, or request a quote and we'll get right back to you.