At a glance: Completed September 29, 2026: a full tear-off and replacement on Martini Road, Waterloo, IL. Shingle: GAF Timberline HDZ. Size: 42.00 squares. Underlayment: synthetic underlayment across the full deck. Office: St. Louis, 314-429-6000.
A large 42.00-square roof covering about 4,200 square feet on Martini Road in Waterloo, IL, the Monroe County, Illinois seat. The crew wrapped it up on Tuesday, September 29. GAF Timberline HDZ went over synthetic underlayment across the full deck, with ice and water membrane at the eaves and valleys.
Job specs
| Location | Martini Road (Waterloo, IL 62298) |
|---|---|
| Completed | Tuesday, September 29, 2026 |
| Opened to completed | 55 days |
| Roof size | 42.00 squares (about 4,200 sq ft) |
| Scope of work | Full tear-off and roof replacement |
| Shingle | GAF — GAF Timberline HDZ |
| Underlayment | JBI Synthetic |
| Ice & water | Alco Ice & Water |
| Starter course | GAF Starter |
| Hip & ridge | GAF Hip & Ridge |
| Ventilation | Lomanco Omni Roll ridge vent |
| Warranty | Lifetime workmanship warranty |
| Project number | STL080526020 |
Choosing a color for your own roof? Browse every GAF Timberline HDZ color on a whole-house preview in our GAF Timberline HDZ color selector.
The roofing system on this house
GAF Timberline HDZ is a laminated architectural shingle built with GAF LayerLock Technology, which bonds the shingle layers together, and a wide StrikeZone nailing area that gives the installer a large, clearly marked target. People shop for the shingle, but what’s underneath it and how the edges are finished decide how long the roof lasts. On this job:
- 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 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.
- GAF 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.
- GAF Hip & Ridge cap. Pre-formed cap that seals the hips and ridge.
- 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
This was a St. Louis office job, installed by our own crew, not subcontracted out. The job was opened in our system on August 5, 2026 and the crew finished on September 29, 2026, 55 days later. 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 Waterloo?
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 Waterloo roof?
GAF GAF Timberline HDZ, 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?
55 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.
Does John Beal Roofing work in Waterloo, IL?
Yes. Waterloo is served by our St. Louis office. Call 314-429-6000 for a free inspection.
Who do I call about a roof in Waterloo?
Our St. Louis office at 314-429-6000. A person answers 24 hours a day, including nights, weekends and holidays.