Is spaced lumber sheathing allowed in seismic design category D2?

In seismic design category D2, building codes typically require enhanced performance and capacity to withstand seismic forces due to the expected ground motion in those areas. Spaced lumber sheathing is generally not considered adequate for these rigorous seismic demands.

The performance of spaced lumber sheathing can lead to issues such as reduced structural integrity and can compromise the overall building efficiency under lateral loads caused by an earthquake. Solid sheathing systems are preferred, as they provide a more continuous surface, improving rigidity and strength in response to environmental forces.

As a result, the code standards generally prohibit the use of spaced lumber sheathing in D2 seismic areas to ensure that structures can effectively support the high seismic loads and maintain safety during potential seismic events.