Red Seal Carpenter Practice Exam

Why should wood and metal shores posts never be used together under the formwork for a suspended slab?

1. Wood shores can never be wedged to the same snugness as metal.

2. Metal shores must be laced but wood shores do not require lacing.

3. Wood and metal react differently to loading so therefore a failure could occur.

4. Metal posts have more reusability so they should be used for cost and efficiency.

The correct answer is: Wood and metal react differently to loading so therefore a failure could occur.

Wood and metal shores posts should never be used together under the formwork for a suspended slab because wood and metal react differently to loading, creating an imbalance and potentially causing a failure. Option A is incorrect because while wood cannot be wedged as tightly as metal, the main concern is the reaction to loading rather than snugness. Option B is also incorrect because the need for lacing is not the main reason for avoiding the use of wood and metal together. Option D is incorrect because the potential for failure due to incompatible reactions to loading outweighs the reusability or cost benefits of using metal posts.