90.1-2019 This data structure describes the composition of a slab-on-grade. The model has building descriptors for the perimeter length and the F-factor, which represents the heat loss per lineal foot. 90.1-2022 Book traversal links for 3.11.9 Slab Construction ‹ 3.11.8 Material Up 3.11.10 Occupant Heat Rate ›