What is the minimum size screw for attaching gypsum board to steel studs?

The minimum size screw for attaching gypsum board to steel studs is commonly recognized as #6. This size is preferred because it provides adequate holding power to securely fasten the gypsum board without the risk of the screw stripping out of the steel or failing under load. A #6 screw has sufficient thread design to engage with the metal studs effectively, ensuring a solid attachment.

Using screws that are too small may result in inadequate holding strength, which can lead to problems such as loosening over time or failure to support the weight of the gypsum board. Conversely, screws that are larger than necessary might not be compatible with typical gypsum board and could cause issues with installation or finishing.

This understanding is crucial for anyone involved in construction or contracting, as improper fastening can lead to structural failures or increased costs associated with repairs or rework.