Roofing decision library
Roofing comparisons
Side-by-side roofing choices without declaring one universal winner.
- Author
- By At-Cost Roofing editorial team
- Editorial review
- Organization editorial review complete
- Dates
- Published August 31, 2026 · Updated August 31, 2026
Official records, labeled calculations, and evidence limits follow our editorial methodology.
A comparison is useful only when the two choices solve the same roof problem and the proposals include the same underlying work.
Hold the base roof constant
- GAF Timberline HDZ vs. Owens Corning Duration — Compare nailing designs, Class 3 records, accessories, warranty paths, colors, and supply.
- GAF Timberline HDZ vs. CertainTeed Landmark — Compare standard Landmark and HDZ nailing designs, classifications, accessories, warranties, and supply.
- Owens Corning Duration vs. CertainTeed Landmark — Compare standard Landmark and Duration nailing designs, classifications, accessories, warranties, and supply.
- Architectural shingles vs. 3-tab shingles — Compare named product examples, pattern, application, classifications, repair matching, supply, and price.
- GAF Timberline UHDZ vs. HDZ: Class 4 vs. Class 3 — Compare two named Timberline products, package-qualified UL 2218 classes, appearance, algae terms, project price, and carrier records.
- Metal roofing vs. asphalt shingles — Compare named assemblies, attachment, detailing, service access, current quotes, and ownership priorities.
- Standing seam vs. exposed-fastener metal — Compare attachment, movement, inspectability, tested uplift, flashing, service, and comparable quotes.
- Synthetic underlayment vs. roofing felt — Compare named rolls, approved uses, fastening, exposure, handling, water resistance, and price.
- Ridge vents vs. box vents — Compare attic zones, low intake, roof geometry, rated net free area, placement, and other exhaust.
- TPO vs. PVC roofing — Compare named low-slope formulations, welded details, exposure compatibility, assembly design, repairs, and warranty limits.
- Roof repair vs. replacement — Compare inspection findings, defect location, surrounding serviceability, compatible material, access, and prior repairs.
- Roof overlay vs. full tear-off — Compare locally adopted code, product instructions, layer count, substrate condition, flashing access, and future removal.
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