Asphalt Shingle Types Compared: 3-Tab vs Architectural vs Class 4

The three categories that matter

Asphalt shingles sold for residential roofs in the US fall into three real categories. Marketing materials add more names (“luxury,” “designer,” “premium architectural”) but for installation, warranty, and performance purposes there are three:

• 3-tab shingles – single-layer, thin, lightweight, lowest cost
• Architectural (dimensional, laminate) shingles – multi-layer, heavier, deeper shadow lines, most homes get these today
• Impact-resistant shingles – usually architectural in shape but built with a polymer-modified asphalt core that passes UL 2218 hail testing. Class 4 is the highest rating.

“Designer” and “luxury” lines are architectural shingles with thicker laminations or aggressive shadow lines for a more dramatic look – they’re a subset of architectural, not a separate category.

3-tab shingles – when (not) to use them

3-tab shingles were the residential standard from the 1960s through the early 2000s. They’re recognizable by the three flat tabs cut into each shingle, creating a uniform striped appearance on the roof.

Technical specs:

• Single layer of asphalt-coated fiberglass mat
• Wind warranty typically 60 mph (some lines warranty to 70 mph)
• Manufacturer warranty: 20-25 years (often pro-rated heavily after year 10)
• Weight: ~200-240 lbs per square (100 sq ft)

Why we rarely install them in Illinois: our wind events regularly exceed 60 mph, and the wind warranty voids when shingles get blown off. The IBC-derived design wind speed for Madison County is 115 mph (3-second gust); 3-tab is rated for a fraction of that.

The legitimate use cases for 3-tab today: matching an existing partial repair where the rest of the roof is 3-tab, or budget-constrained projects on a home that’s going on the market in the next 1-2 years. Otherwise, architectural is the right call.

Architectural shingles – the workhorse category

Architectural (also called dimensional or laminate) shingles are what’s on most Illinois roofs installed since 2005. Two layers of mat material are fused together with asphalt, giving each shingle more thickness, more weight, and a textured appearance that doesn’t look like a uniform striped grid.

Technical specs (varies by line):

• Two-layer laminate construction
• Wind warranty: 110-130 mph (Class F to Class H) – most current premium lines hit 130 mph
• Manufacturer warranty: 30-50 years material defect (limited lifetime is common marketing language)
• Weight: 240-340 lbs per square
• UL 790 Class A fire rating standard
• Six-nail pattern available (and recommended in high-wind zones – that’s all of Illinois)

What changes between architectural lines:

The performance difference between a basic and premium architectural line comes from a few details:

• Thickness and weight – heavier shingles resist wind uplift better
• Sealant strip width and quality – wider/better sealants improve actual installed wind performance
• Algae resistance – copper or zinc granules embedded in the surface inhibit algae growth (the dark streaks you see on shaded roofs)
• Color depth and shadow line – premium lines have more dramatic shadows that mimic slate or wood shake
• Warranty length and transferability – premium lines often offer longer warranties and second-owner transfers

Trill Roofing’s defaults:

• GAF Timberline HDZ – our most-installed line. 130 mph wind warranty with the LayerLock technology, StainGuard Plus algae resistance, and a strong warranty when paired with the GAF Silver Pledge or Golden Pledge package (which we can pull as a GAF Certified Contractor).
• CertainTeed Landmark – strong alternative, comparable specs, sometimes preferred by homeowners who want a non-GAF brand
• Owens Corning Duration – uses SureNail technology with a fabric reinforcement strip; the strongest sealant adhesion in the architectural category

Class 4 impact-resistant shingles – UL 2218 testing

Impact-resistant (IR) shingles look almost identical to architectural shingles on the roof, but the asphalt is modified with polymers (typically SBS – styrene-butadiene-styrene rubber) that make the shingle flexible enough to absorb a hailstone strike without cracking the mat underneath.

The industry standard is UL 2218, which drops steel balls of increasing size onto the shingle and measures whether the mat cracks:

• Class 1 – 1.25″ steel ball (about $25 marble size)
• Class 2 – 1.5″ steel ball
• Class 3 – 1.75″ steel ball
• Class 4 – 2.0″ steel ball (golf ball size, hail-event equivalent)

Class 4 is the highest rating and what’s marketed as “impact-resistant.” In Illinois – which sits squarely in the hail belt – this matters both for actual hail performance and for homeowner insurance.

Illinois insurance discount for Class 4:

The four largest IL homeowner carriers all offer discounts when you install certified Class 4 shingles:

• State Farm – typically 5-15% on the homeowner premium (varies by ZIP and policy)
• Allstate – “Impact-Resistant Roofing” discount, typically 5-25%
• Farmers – discount available where filed
• American Family – Class 4 hail discount available in most IL counties

You’ll need to ask your agent for the specific discount your carrier offers and submit a manufacturer certification for the installed product. We provide the documentation as part of the install package.

Class 4 product lines we install:

• GAF Timberline AS II (the impact-resistant version of HDZ)
• CertainTeed Landmark IR / NorthGate
• Owens Corning Duration STORM
• Atlas StormMaster Slate

Cost premium over standard architectural: typically $0.50-$0.85 per square foot installed. For a 25-square (2,500 sq ft) roof that’s $1,250-$2,125 extra at install – and it pays back via the insurance discount in 3-7 years for most IL homeowners.

Designer and luxury shingles – when they’re worth it

Designer and luxury asphalt shingles are essentially architectural shingles built thicker, often with double laminations and aggressive shadow lines to mimic the look of slate, wood shake, or cedar. Examples:

• GAF Camelot II – slate-look
• GAF Grand Sequoia – shake-look
• CertainTeed Grand Manor – slate-look
• CertainTeed Presidential Shake – shake-look
• Owens Corning Berkshire – slate-look

These are 50% to 100% more expensive than standard architectural ($9-$13 per square foot installed). They’re worth it when:

• The home’s architecture demands it (historic Victorian, high-end colonial, certain HOAs)
• The neighborhood comparables warrant the investment (premium subdivisions in Edwardsville or Godfrey)
• You’re planning to stay in the home long-term and the curb appeal matters to you

For most Illinois homes, premium architectural (Timberline HDZ Reflector Series, Landmark Pro) hits the right balance of performance and appearance without the designer-line premium.

What this means for your Illinois roof

For the average Madison County or Riverbend home, the answer to “what shingle should I pick” is:

1. Architectural minimum. Skip 3-tab unless you have a very specific reason.
2. 130 mph wind rating. Most current architectural lines hit this – confirm the spec sheet matches.
3. Consider Class 4 if your insurance offers the discount. Run the math: discount × years owned vs the $1,000-$2,000 install premium. For most IL homeowners staying 5+ years, Class 4 pencils out.
4. Algae-resistant granules if your roof has north-facing slopes or significant tree shade (most Riverbend properties).

And – the shingle is maybe 60% of the system. The other 40% is what’s underneath it: ice and water shield, synthetic underlayment, properly installed flashing, balanced ventilation, and a clean nailing pattern. The best shingle on a sloppy install fails sooner than a mid-range shingle properly installed.

If you’re getting quotes, ask each contractor:

• Which shingle line and color?
• What underlayment? (Synthetic is the right answer; felt is the cheap-shortcut answer)
• Where will ice and water shield be installed?
• What’s the nailing pattern (4-nail vs 6-nail)?
• How is ventilation being addressed?

If the answers are vague, that’s a flag.

Get a Trill Roofing inspection

A roof inspection is free and we’ll talk you through which shingle category and line makes sense for your home, budget, and how long you plan to stay. No pressure. Schedule one at /free-inspection/ or call (618) 304-7094.

Related reading:

• Class 4 impact-resistant shingles + IL insurance discount
• Why attic ventilation determines how long your shingles last
• Trill Roofing’s full roof replacement process

Related Trill Roofing Services

More guides: Class 4 Impact-Resistant Shingles · Attic Ventilation Sizing · Ice Dam Prevention

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No-pressure, written estimate. Family-owned. IL-licensed. Serving Godfrey and the Riverbend.