When preparing a deck for aluminum roofing or siding, it’s important to start with a solid, flat surface to ensure proper installation and prevent future problems like warping or leaks. The first step is sheathing, which often means installing plywood or oriented strand board (OSB) over the framing. This sheathing provides a stable base for fastening the aluminum panels. Confirm that the sheathing is securely nailed or screwed down, with fasteners spaced according to local building codes and manufacturer instructions. Checking for any loose or damaged boards is key—replace or reinforce these areas before moving forward. The flatness of the deck is equally crucial; use a straightedge or level to identify high or low spots that could affect the aluminum’s appearance and performance. Simple DIY fixes like sanding down raised areas or adding shims under low spots can make a big difference.
For fasteners, selecting corrosion-resistant screws or nails rated for use with aluminum prevents rust stains and ensures durability. Avoid standard steel fasteners that can react with aluminum over time. When doing your own inspection, look for any gaps or uneven spots in the sheathing and test for firmness by pressing on different areas; any movement may hint at loose decking underneath. If you encounter large uneven areas or are unsure about the condition of the existing deck, it’s a good idea to call a professional roofer. When consulting a contractor, ask "What type of sheathing do you recommend for aluminum panels in this climate?" and "How will you ensure the deck’s flatness before installing the aluminum?" These questions help ensure your deck is properly prepared, safeguarding your investment and maintaining your roof or siding warranty.