Which type of screws are often specified for attaching a stair frame according to manufacturer’s instructions?

Lag screws are specifically designed for heavy-duty applications that require a strong connection, making them ideal for use in attaching elements like stair frames. They are larger and have a thicker shaft than standard wood or sheet metal screws, which provides greater tensile strength and load-bearing capacity. The threaded shank helps them securely grip the material, preventing pull-out under the stress of weight and movement typically associated with stairs.

In the context of stair frames, the structural integrity and safety are paramount, so the use of lag screws is emphasized in manufacturer’s instructions to ensure that the frame is secured firmly to support the load. This level of strength and durability is crucial for the stability of the stair system, as it not only affects the performance of the stair but also impacts the safety of anyone using it.