Roofing Underlayment
The critical weather barrier between your roof sheathing and shingles — synthetic and traditional felt options for every project and budget.
Underlayment Types
Synthetic Underlayment
Modern, non-tear underlayment that outperforms traditional felt. Lighter weight, easier to handle, and provides a safer walking surface during installation.
Product Lines
- • GAF FeltBuster — 10 sq / roll, non-skid surface
- • CertainTeed DiamondDeck — 10 sq / roll, high UV resistance
- • Owens Corning ProArmor — 10 sq / roll, 180-day UV exposure
Key Advantages
- 25× stronger than #15 felt
- Lays flat — no wrinkling or buckling
- UV resistant for extended exposure
- Non-skid walking surface
Asphalt Felt (#15 & #30)
Traditional asphalt-impregnated felt paper. Still widely used and code-accepted. Economical choice for budget-conscious projects and standard installations.
Product Lines
- • #15 Asphalt Felt — 4 sq / roll (standard)
- • #30 Asphalt Felt — 2 sq / roll (heavy-duty)
Key Advantages
- Lower material cost
- Code-accepted nationwide
- Familiar to all roofers
- #30 provides added protection for steeper slopes
What We Stock
| Product | Coverage / Size | In Stock |
|---|---|---|
| Synthetic Underlayment (GAF FeltBuster) | 10 sq / roll | Yes |
| Synthetic Underlayment (CertainTeed DiamondDeck) | 10 sq / roll | Yes |
| #15 Asphalt Felt | 4 sq / roll | Yes |
| #30 Asphalt Felt | 2 sq / roll | Yes |
| Cap Nails (plastic cap) | 1″ and 1¼″ | Yes |
| Underlayment Tape | 2″ × 165′ | Yes |
Pro Tip: Which Underlayment?
For North Country roofs, we recommend synthetic underlayment on nearly every project. It's stronger, lighter, safer to walk on, and won't absorb moisture if rain catches you mid-install.
Traditional #30 felt is still a solid choice for budget work and meets all building codes. #15 felt should be limited to temporary protection or warm-climate projects.
Need Underlayment?
Both synthetic and felt always in stock — call for quantity pricing on full-roof orders.