To destroy a sheet metal wall in Rust, you need 23 satchel charges. Each satchel charge deals about 43-50 damage to the wall, which has around 1000 hit points, so it takes this many charges to break through the wall effectively

. For context:

• It takes 4 satchels to destroy a sheet metal door.
• A wooden wall requires 3 satchels.
• A stone wall requires 10 satchels.
• An armored wall requires 46 satchels

Satchel charges are explosive devices used in raiding player-made buildings, and while they are cheaper and more accessible than C4, they have a random fuse time and can sometimes fail to detonate, so having extra satchels is advisable

. In summary, for a sheet metal wall, plan on using 23 satchel charges to successfully breach it.