Red Seal Carpenter Practice Exam 2025 - Free Carpenter Practice Questions and Study Guide

A and C are incorrect options because they do not account for the spacing of the floor joists. The cross bridging needs to be placed at the same spacing as the joists, which is 400mm. Both A and C would result in incorrect spacing and potentially compromise the stability of the floor.

B is incorrect because it only uses one measurement (235 mm) which is not enough to accurately layout the cross bridging. The framing square requires two measurements to create precise angles for cutting.

Therefore, the best option is D which uses both the width of the joist (254 mm) and the spacing (400mm) to create the correct angle for the cross bridging. It is important to use both measurements and follow the proper layout to ensure the stability and safety of the floor structure.