The Best Nail Gun for Hardie Board Siding

The best nail gun for Hardie board is a pneumatic coil siding nailer like the Bostitch N66C, loaded with corrosion-resistant (hot-dipped galvanized or stainless) siding nails — and set to just seat the nail flush, never overdriven. Fiber cement is brittle; the tool matters less than the setup.

Why a coil siding nailer

Fiber-cement siding (James Hardie and similar) is heavy and dense but cracks if you crush it. A coil siding nailer gives you the nail length and depth control you need, and the capacity to move down a wall quickly. A coil roofing nailer can work in a pinch with the right nails, but a siding nailer's nail range is a better match.

The nails matter more than the gun

• Corrosion resistance is required: use hot-dipped galvanized or stainless steel siding nails — fiber cement holds moisture and eats bright/electro-galvanized nails.
• Length: long enough to penetrate the framing/studs (commonly around 2″+ for blind-nailing through the board into studs). Follow Hardie's fastener guidance for your install.
• Type: siding or roofing nails with a head that holds without over-penetrating.

Don't overdrive — the #1 mistake

Overdriving crushes the fiber cement and blows out the holding power (and voids the look and warranty). The fix:

1. Set your compressor pressure on the low side and dial the gun's depth so the nail head sits flush, not sunk.
2. Test on a scrap piece before you start the wall.
3. Blind-nail (through the top, hidden by the next course) where the install allows, or face-nail per the manufacturer's pattern.

Step-by-step in our how to nail Hardie board guide.

Frequently asked questions