40 Hour Property and Building Inspection Practice Test

Which engineered wood product can replace conventional joists?

1. Steel beams

2. Plywood sheets

3. Plasterboard

4. Wood I-joists

The correct answer is: Wood I-joists

Wood I-joists are specifically designed to replace conventional joists in construction. These engineered wood products consist of two parallel flanges made from solid lumber or oriented strand board and a web that can be made from various materials like plywood or other composite materials. This design allows for greater strength and stability while being lighter than traditional solid wood joists. Wood I-joists are also more versatile, permitting longer spans without the need for intermediate supports compared to conventional lumber, which is often limited by its structural properties. Using wood I-joists can lead to more efficient material usage and faster installation, making them a popular choice in modern construction practices. They provide the same (if not better) load-bearing capabilities as traditional joists, along with the added benefits of less warping and shrinking, which ensures a more stable floor system in the long term.