At a glance: In short: 31.33 squares, GAF Timberline HDZ, synthetic underlayment across the full deck, ridge vent, lifetime workmanship warranty. Castlebar Drive, St. Louis, MO 63146, done October 20, 2026 by our St. Louis crew (314-429-6000).
On Castlebar Drive in St. Louis, MO (west St. Louis County near Maryland Heights, a few minutes from our headquarters), the crew tore off and replaced a mid-size 31.33-square roof, roughly 3,133 square feet. It was one of 30 roof replacements our crews completed in St. Louis in October 2026. The system: synthetic underlayment across the full deck, ice and water membrane in the valleys and at the eaves, and GAF Timberline HDZ on top.
What the work order shows
| Location | Castlebar Drive (St. Louis, MO 63146) |
|---|---|
| Completed | Tuesday, October 20, 2026 |
| Opened to completed | 34 days |
| Roof size | 31.33 squares (about 3,133 sq ft) |
| Scope of work | Full tear-off and roof replacement |
| Shingle | GAF — GAF Timberline HDZ |
| Underlayment | JBI Synthetic |
| Ice & water | Ice & water membrane |
| Starter course | Factory starter |
| Hip & ridge | GAF Hip & Ridge |
| Ventilation | Lomanco Omni Roll ridge vent |
| Warranty | Lifetime workmanship warranty |
| Project number | STL091626025 |
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.
Materials installed, layer by layer
Timberline HDZ is GAF's architectural shingle with a wide StrikeZone nailing area and LayerLock Technology holding the two layers of the shingle together, so fasteners land where they hold best. Every one of our replacements is a system, not just shingles. On this roof, from the deck up:
- 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.
- Self-sealing ice and water membrane where water concentrates. It seals around every nail driven through it, which matters in valleys and at the eaves.
- 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.
- 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 installed it
This was a St. Louis office job, installed by John Beal Roofing. The job was opened in our system on September 16, 2026 and the crew finished on October 20, 2026, 34 days later. Family-owned since 1947, we back every replacement with a lifetime workmanship warranty. If a storm opens up a roof at 2 a.m., someone answers the phone. See 24/7 emergency service.
Need a roof in St. Louis?
Free inspection, documented slope by slope, no obligation. St. Louis office: 314-429-6000
FAQ about this roof
What shingle was installed on this St. Louis roof?
GAF GAF Timberline HDZ, over synthetic underlayment across the full deck. The full system is in the project details table above.
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.
How big was the roof on Castlebar Drive?
31.33 squares, or about 3,133 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 St. Louis?
Our St. Louis office at 314-429-6000. A person answers 24 hours a day, including nights, weekends and holidays.