A carpenter needs to frame a 2.4-metre wide opening for a patio door in an exterior wall carrying combined roof and floor loads. If using Laminated Veneer Lumber (LVL) with a depth of 240 mm, what is the minimum typical width (thickness) often referenced in span tables for this application, to satisfy bending and shear requirements?

Question: A carpenter needs to frame a 2.4-metre wide opening for a patio door in an exterior wall carrying combined roof and floor loads. If using Laminated Veneer Lumber (LVL) with a depth of 240 mm, what is the minimum typical width (thickness) often referenced in span tables for this application, to satisfy bending and shear requirements?

Answer options:

• 38 mm
• 45 mm ✅ 89 mm
• 130 mm

Correct answer: 89 mm

Explanation: For a 2.4-metre span with significant loads, a single 38 mm or 45 mm LVL might not be sufficient for stiffness or strength. A common and robust solution is often an 89 mm (3.5 inch nominal) LVL, or two thinner LVLs glued/nailed together, to meet or exceed header table requirements. Consult a specific LVL manufacturer's span tables, abiding by CSA O86.