At a glance: In short: 4.67 squares, OC Duration, synthetic underlayment across the full deck, ridge vent, lifetime workmanship warranty. East Broadway, Alton, IL 62002, done October 23, 2026 by our St. Louis crew (314-429-6000).
Our crew finished a 4.67-square job, only about 467 square feet, the scale of a garage, porch roof or one section of a house on East Broadway in Alton, IL on Friday, October 23. Alton is a Madison County river city on the bluffs above the Mississippi, with a deep stock of older homes. It was one of 4 roof replacements our crews completed in Alton in October 2026. The system: synthetic underlayment across the full deck, ice and water membrane in the valleys and at the eaves, and OC Duration on top.
What the work order shows
| Location | East Broadway (Alton, IL 62002) |
|---|---|
| Completed | Friday, October 23, 2026 |
| Opened to completed | 24 days |
| Roof size | 4.67 squares (about 467 sq ft) |
| Scope of work | Full tear-off and roof replacement |
| Shingle | Owens Corning — OC Duration |
| Underlayment | JBI Synthetic |
| Ice & water | Ice & water membrane |
| Starter course | Factory starter |
| Hip & ridge | Owens Corning Hip & Ridge |
| Ventilation | Lomanco Omni Roll ridge vent |
| Warranty | Lifetime workmanship warranty |
| Project number | STL092926033 |
Choosing a color for your own roof? Browse every Owens Corning TruDefinition Duration color on a whole-house preview in our OC Duration color selector.
Materials installed, layer by layer
Owens Corning TruDefinition Duration uses SureNail Technology, a woven strip across the nailing zone that gives the fasteners something to grab and helps the shingle stay down in high wind. The shingle is only the top layer. Here’s the full system that went on this house:
- A full layer of synthetic underlayment. It’s the backup water barrier under the shingles, and it holds up to foot traffic and wind far better than paper felt.
- Ice and water membrane at the eaves and in the valleys. This self-adhering layer goes where water backs up: behind ice dams at the eaves and where two slopes meet.
- Factory starter at the eaves and rakes. It’s a purpose-made starter strip with factory adhesive, not cut-up field shingles, so the edges stay sealed.
- Owens Corning Hip & Ridge on the hips and peak. Matching cap shingles made for the job, not field shingles cut into pieces.
- Lomanco Omni Roll ridge vent. It runs along the peak and lets hot, damp attic air escape. That protects the decking and keeps shingles from baking from below.
Who did the work
The crew came out of our St. Louis office. From the day the job was opened (September 29, 2026) to the day the crew finished (October 23, 2026) took 24 days. John Beal Roofing has been family-run since 1947, and our lifetime workmanship warranty covers the installation for as long as you own the home. We answer the phone around the clock, storms included. See 24/7 emergency service.
Need a roof in Alton?
Free inspection, documented slope by slope, no obligation. St. Louis office: 314-429-6000
Common questions about this job
What shingle was installed on this Alton roof?
Owens Corning OC Duration, over synthetic underlayment across the full deck. The full system is in the project details table above.
How long did this project take from start to finish?
24 days from the day the job was opened to the day the crew finished. Most of that time is scheduling, material ordering and any insurance paperwork. The tear-off and install usually take a day or two on a house this size.
How big was the roof on East Broadway?
4.67 squares, or about 467 square feet of roof surface. A roofing square is 100 square feet. Roofs are measured and priced that way, not by the square footage of the floor plan.
Was ice and water shield installed?
Yes. Ice and water membrane went in the valleys and along the eaves, the spots where water backs up or collects first.
Who do I call about a roof in Alton?
Our St. Louis office at 314-429-6000. A person answers 24 hours a day, including nights, weekends and holidays.