01 / Assembly
A roof is a system, not a surface.
The visible material gets the attention, but leaks often involve transitions and movement. Deck condition, slope, underlayment, leak barrier, flashing, fasteners, ventilation, penetrations, edges, and drainage all belong in the conversation.
There is no universally best roofing material. Fit depends on the building, roof geometry, structure, exposure, budget, architectural goals, installer experience, and maintenance appetite.
02 / Orientation
Compare the questions, not a generic score.
| Material family | Starting point | Pay attention to |
|---|---|---|
| Asphalt shingles | Broad residential fit | Product lines vary |
| Metal roofing | Profile and substrate matter | Fasteners and movement |
| Cedar roofing | Natural material care | Ventilation and moisture |
| Slate roofing | Structure and specialist skill | Weight and repairs |
| Low-slope membranes | Drainage first | Seams and penetrations |
Product lines and assemblies vary substantially within every category. Require the exact product and accessory specification in the estimate.
03 / Fit
Start with the building and the owner.
- Geometry: pitch, valleys, dormers, transitions, penetrations, drainage, and access.
- Structure: deck condition, framing, existing loads, and any engineering needs.
- Environment: shade, debris, coastal exposure, wind, snow, and ventilation.
- Ownership: expected maintenance, repairability, future solar, and how long you expect to own the property.
- Installation: demonstrated experience with the specified system, not merely roofing in general.
04 / Explorer
Open a material profile.
Use these profiles as interview prompts. They are not product specifications or rankings.
Material profile
Asphalt shingles
- Starting point
- Broad residential fit
- Pay attention to
- Product lines vary
- System note
- Flashing, ventilation, deck, and installation matter as much as the shingle.
- Material fit
- Common for many pitched residential roofs; available in multiple product tiers and profiles. Compare the full specified system rather than a generic material label.
- Questions for the bidder
- Ask about algae resistance, wind rating, accessory compatibility, workmanship coverage, and the exact manufacturer warranty.
Material profile
Metal roofing
- Starting point
- Profile and substrate matter
- Pay attention to
- Fasteners and movement
- System note
- Details at penetrations, valleys, edges, and dissimilar metals deserve specific answers.
- Material fit
- Standing-seam and exposed-fastener systems are different products. Gauge, coating, substrate, panel profile, and installation method all affect fit.
- Questions for the bidder
- Ask how thermal movement, snow retention, penetrations, oil canning, and future repairs are handled.
Material profile
Cedar roofing
- Starting point
- Natural material care
- Pay attention to
- Ventilation and moisture
- System note
- Exposure, treatment, fastening, and maintenance expectations should be explicit.
- Material fit
- Cedar shakes and shingles can suit particular architectural goals. Local conditions, detailing, and owner maintenance expectations matter.
- Questions for the bidder
- Ask about material grade, treatment, ventilation, fire-related requirements, moss management, and realistic upkeep.
Material profile
Slate roofing
- Starting point
- Structure and specialist skill
- Pay attention to
- Weight and repairs
- System note
- Confirm structural suitability, flashing metals, access, and repair experience.
- Material fit
- Slate is a durable natural material but not an interchangeable shingle substitute. Existing structure and specialist installation are central.
- Questions for the bidder
- Ask about slate source and grade, structural review, flashing, replacement stock, foot traffic, and future repair strategy.
Material profile
Low-slope membranes
- Starting point
- Drainage first
- Pay attention to
- Seams and penetrations
- System note
- EPDM, TPO, PVC, and modified systems have different details; slope and drainage are foundational.
- Material fit
- Low-slope roofs need a system selected for the actual assembly and use. Generic ‘flat roof’ labels conceal important differences.
- Questions for the bidder
- Ask about slope, drains or scuppers, insulation, membrane type and thickness, seam method, edge metal, and ponding-water observations.
Use this guide responsiblyThis is general educational information, not engineering, legal, insurance, or safety advice for your property. Conditions and requirements vary. Use qualified professionals and the relevant local authority. How Roofline handles sources and uncertainty.