For external oak cladding, stainless steel fixings (A2 or A4 grade) are essential. Oak contains tannins that can react with iron-based metals, leading to black staining and corrosion. Stainless steel avoids this issue and offers durability.
Best Fixings:
Stainless steel screws are preferred for structural security, removability, and precision. We recommend using 4-5mm diameter wood screws and drilling pilot holes to avoid oak boards splitting, especially near ends.
Alternatives:
Stainless steel annular ring nails may be used for a cleaner aesthetic or in traditional applications, especially in hidden fixing. Pneumatic nail guns are often used for speed, however you must be careful not to split the oak cladding boards.
Avoid:
Galvanized, zinc-coated, or mild steel fixings as they will corrode and stain oak.