To Install RSJ, or steel beam in a wall opening, you may use thick plywood, concrete and softwood. First you have to make the cement paste. Afterwards, you have to apply mortar to the pad stones. Use a hammer or a wooden batten to reinforce the trowel. The assignment will be complete after applying bricks and mortar. The mortar takes at least 3 days to completely dry-off.
When you plan to remove a wall or a section of wall to create a new opening, you to insert a steel RSJ beam or concrete beam to support the roof and the wall weight.