Cap Nailers for Synthetic Underlayment

Synthetic underlayment is the layer that keeps a roof dry between tear-off and the final covering going on, and how it's fastened decides whether that protection holds through wind and rain. Cap nailers drive a fastener through a small plastic cap, spreading the load across the underlayment instead of letting a bare nail head tear through it.

Why the Cap Matters

Wider hold-down — the cap spreads pressure across the fastener, so the underlayment stays pinned instead of pulling loose around the nail.
Consistent spacing — pneumatic capped fastening keeps pattern and depth even across a slope, which matters once wind gets under an edge.
Watertight dry-in — a properly capped layer keeps a roof sealed against weather during the days a job may sit between stages.

Where It Fits On Site

Cap nailers work alongside our pneumatic coil roofing nailers and compressors, so the crew fastens both underlayment and the finished roofing at the pattern each layer calls for. It's a groundwork step, not a finish detail — but it's the one that keeps a deck protected while the rest of the roof goes on.