Why it's not ideal:
* Cracking/Splitting: Hardy board (fiber cement siding) is brittle and prone to cracking, especially near the edges or if you nail too close to the edge. A nail doesn't spread the force as well as a screw.
* Poor Holding Power: Nails tend to pull out more easily than screws in Hardy board. Over time, the expansion and contraction of the siding due to weather changes can loosen the nail.
* Rusting: Standard nails can rust, leading to unsightly stains on your siding. Galvanized or stainless steel nails are better, but even they can corrode over time.
* Potential for Moisture Intrusion: A poorly installed nail can create a pathway for water to seep behind the siding, leading to damage.
When you might consider it (and how to do it):
* Lightweight Items Only: If you're hanging something very light (like a small, lightweight picture or a decorative ornament), a nail *might* be okay. But proceed with caution.
* Use the Right Nails:
* Galvanized or Stainless Steel: Essential to prevent rust and corrosion.
* Ring-Shank Nails: These have a textured shank that provides better grip.
* Small Head: A smaller head is less likely to cause stress and cracking.
* Predrill a Hole: Predrilling is crucial to minimize cracking. Use a drill bit slightly smaller than the diameter of the nail.
* Nail Carefully:
* Tap the nail in gently. Avoid hammering too hard, as this can crack the siding.
* Drive the nail flush with the surface, but not too deep. Overdriving can also crack the siding.
* Seal the Nail Hole: Apply exterior-grade caulk around the nail head to prevent water from seeping behind the siding. Match the caulk color to the siding for a clean look.
* Avoid Edges and Corners: Stay at least 1 inch away from the edges and corners of the siding panels.
Better Alternatives:
* Screws: Screws provide much better holding power and are less likely to crack the Hardy board. Use exterior-grade screws and predrill a pilot hole.
* Hardy Board-Specific Fasteners: There are specialized fasteners designed for Hardy board, which offer the best performance.
* Mounting Blocks/Brackets: If you're hanging heavier items (like lights or house numbers), use a mounting block or bracket that is designed to be securely fastened to the wall studs behind the siding. This transfers the weight to the studs, not just the siding.
Important Considerations:
* Warranty: Putting nails in Hardy board might void the manufacturer's warranty if not done according to their specifications. Check the warranty information.
* Professional Installation: If you're unsure about how to do this correctly, it's best to consult with a professional contractor or siding installer.
In summary, while you *can* put a nail in Hardy board for very light items, it's generally not recommended. Using screws or specialized fasteners, especially in conjunction with mounting blocks, is a much safer and more reliable method.