What classes does the 9 mm OSB board have?
The 9 mm board has two Shopify variants: class 2 with SKU LT-4553 and class 3 with SKU LT-4552. According to EN 300, OSB/2 is a load-bearing board for dry conditions, while OSB/3 is a load-bearing board for humid conditions. Before ordering, the class must be confirmed on the marking and declaration of the specific sheet, as the manufacturer is not indicated on the product.
Is 9 mm OSB suitable as a base for roofing?
A thickness of 9 mm alone does not prove that the board is suitable for a specific roof. The OSB/2 or OSB/3 class is required, along with the spacing between supports, snow load, main axis direction, edge support, and roofing system requirements. Without a factory table and structural verification, a universal spacing for battens or rafters should not be set.
What are the length and width of the 9 mm OSB board?
The Shopify product does not publish sheet dimensions or offer length or width options. Therefore, the area of one board, the number of sheets, or the transport format cannot be reliably calculated. LATIVA must confirm the exact dimensions, straight or profiled edge, and allowable deviations for the specific batch before quantity calculation or cutting layout.
What is the practical difference between 9 mm and 11 mm OSB?
The confirmed difference is the nominal thickness of 2 mm; both products have class 2 and class 3 variants. This does not automatically mean a defined difference in load capacity, weight, or allowable span, as the manufacturer and declaration are missing. The choice is made based on the structural table for the specific board, not by the general assumption that every 11 mm sheet replaces a 9 mm one.
Is the 9 mm OSB/3 board waterproof?
OSB/3 is not a waterproof board. The European Federation of Panel Producers clarifies that moisture resistance refers to the adhesive bond within the limits of EN 300, not to constant wetting. The sheet must be protected from prolonged water exposure and installed in a properly designed roofing or wall system. OSB/2 class is for dry conditions.
How do I calculate the number of 9 mm OSB boards for sheathing?
Divide the net sheathing area by the confirmed useful area of one sheet, then add a reserve according to geometry and cutting. Before that, you need to know the actual dimensions, laying direction, supports, joints, and openings; this data is missing from the product. Do not calculate based on the photo alone. Sheets around chimneys, dormers, and breaks must be planned separately.
