Theres a new residential housing complex under construction near me; a series of buildings containing about 250 units. They are five storeys tall, and they’re framed with freaking 2 x 4s! I can’t get close enough to check with a tape measure, but they appear to be on 12" centers, with prefab trusses for joists, and trusses in place of traditional cripple studs over the larger window openings on the exterior walls. The stairwells and elevator housings are built with concrete and CMUs, but everything else is wood.
Is five storeys a realistic limit, or can buildings designed to carry these types of loads be built even taller using only 2 x 4s? What would be needed to make a wood sky scraper?