At a glance: In short: 20.67 squares, OC Supreme, synthetic underlayment across the full deck, ridge vent, lifetime workmanship warranty. Clawson Street, Alton, IL 62002, done October 21, 2026 by our St. Louis crew (314-429-6000).
This one was a 20.67-square roof, right around the size of a typical single-story ranch on Clawson Street in Alton, IL, 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. OC Supreme went over synthetic underlayment across the full deck, with ice and water membrane at the eaves and valleys.
Project details
| Location | Clawson Street (Alton, IL 62002) |
|---|---|
| Completed | Wednesday, October 21, 2026 |
| Opened to completed | 175 days |
| Roof size | 20.67 squares (about 2,067 sq ft) |
| Scope of work | Full tear-off and roof replacement |
| Shingle | Owens Corning — OC Supreme |
| 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 | STL042926005 |
Want to see what OC Supreme looks like on a whole house? Try every color in our OC Supreme color selector.
The roofing system on this house
Owens Corning Supreme is a traditional three-tab shingle, a flat, uniform look that suits smaller sections, outbuildings and homes that were originally built with three-tab. The shingle is only the top layer. Here’s the full system that went on this house:
- Synthetic underlayment, edge to edge. It doesn’t wrinkle or tear like felt, and it keeps the deck dry if a shower pops up mid-job.
- Ice and water shield in the valleys and along the eaves. Those are the two places a Midwest roof takes on water first, from ice dams in January and heavy runoff in spring storms.
- Factory starter strip along every edge. The first course is where wind gets under a roof. A factory starter with its own sealant line locks it down.
- 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. Continuous exhaust at the peak. Together with the soffit intake, it moves heat and moisture out of the attic.
The crew behind this roof
This was a St. Louis office job, installed by John Beal Roofing. From the day the job was opened (April 29, 2026) to the day the crew finished (October 21, 2026) took 175 days. Family-owned since 1947, we back every replacement with a lifetime workmanship warranty. 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
Questions homeowners ask about this project
What shingle was installed on this Alton roof?
Owens Corning OC Supreme, over synthetic underlayment across the full deck. The full system is in the project details table above.
How big was the roof on Clawson Street?
20.67 squares, or about 2,067 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.
How long did this project take from start to finish?
175 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.
What kind of ventilation went on this roof?
A Lomanco Omni Roll ridge vent along the peak. Paired with soffit intake, it lets hot, moist attic air escape.
Do you publish the customer's address?
No. We publish the street name, city and ZIP so you can see we really work in your neighborhood. We leave off the house number and never publish a customer's name.
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.