With Attic trusses, it is feasible to span wider distances on to exterior load-bearing walls, dependant upon the dimensions with the area or sought after span. Micropiles are stuffed for their design depth by pouring grout into a steel casing that's been pre-drilled. Screw piles are pre-fabricated structural steel things https://maps.app.goo.gl/YojC2P1gNve8wSuB6