Brick Steel Lintel Caulk Gap at Bottom
Yes, paint the steel to limit the corrosion of the steel.
Do NOT caulk the gap between the steel lintel and the brick or masonry stone, EVER! The space or gap between the steel and the brick functions as a weep hole or weep space to allow moisture, condensation or water to escape from the cavity between the brick and framing. This space is very important to keep open, and yes it can be a bit unsightly.
If this gap becomes blocked or sealed then the water gets trapped, rust occurs and after enough time the steel fails from oxidation which is the rust. Keep that gap open. Thank you for asking this question.
For remodeling and repair services in Metro St. Louis, call Mosby Building Arts at 314.909.1800 or contact them here.