Asphalt Shingle Roofing in Alton, IL

Architectural vs. 3-tab vs. impact-resistant

Three categories of asphalt shingle, very different products:

3-tab – the old standard. Thin, single-layer, lower wind rating (typically 60 mph). Cheapest but shortest lifespan. We don’t recommend 3-tab on new installs in the Riverbend because our wind events outpace what the shingle can handle.

Architectural (dimensional, laminate) – the workhorse. Multiple layers fused together, Class H wind rating (130 mph), 30 to 50 year manufacturer warranty. About 80% of our installs use this category. Examples: GAF Timberline HDZ, CertainTeed Landmark, Owens Corning Duration.

Class 4 impact-resistant – same architectural design but with a polymer-modified asphalt core that resists hail. Passes UL 2218 Class 4 testing (highest rating). State Farm, Allstate, Farmers, and American Family typically offer a 5-25% IL homeowner premium discount when you install Class 4. Adds about $0.50-$0.85/sq ft over standard architectural.

What shingle to pick for a Alton home

Alton’s older masonry homes often need careful chimney flashing and step-flashing work because the original detailing has weathered for 75+ years. The river bluff exposure means north-facing roofs get less freeze-thaw, while south-facing slopes age faster from sun and thermal cycling.

Older Alton homes near the river often have chimney leaks where the original step flashing has failed but the brick chimney is in good shape – that’s a flashing repair, not a teardown.

GAF Certified – what it means for your install

Trill Roofing is a GAF-certified contractor. What it means for you:

• Extended manufacturer labor warranty on your install (typically 25-50 years vs. the standard 10-25)
• Material defect coverage that doesn’t depend on us being in business – GAF stands behind the warranty directly
• Quarterly installation audits – GAF spot-checks our work to keep the certification
• Access to GAF’s premium product lines (Golden Pledge, System Plus) that aren’t sold to non-certified contractors

If you go with CertainTeed or Owens Corning instead, we still pull manufacturer-certified status on those lines.

Asphalt shingle install pricing in Alton

Material + installation pricing for 2026:

• Standard architectural: $4.50-$6.50 per square foot
• Premium architectural (Timberline HDZ, Landmark Pro): $5.50-$7.50 per square foot
• Class 4 impact-resistant: $6.00-$8.50 per square foot
• Designer / luxury (Camelot, Grand Manor): $9.00-$13.00 per square foot

Pricing covers tear-off, decking inspection, ice and water shield, underlayment, drip edge, starter, shingles, ridge cap, flashing, ventilation as needed, and cleanup.

Ready for your Asphalt Shingle Roofing?

Trill Roofing serves Alton, IL with honest inspections, written estimates, and a local crew. No pressure. No upselling.