June 2006
S-1 Subzone--Floor Slab
This subzone equals the depth of the floor finish, topping slab and structural slab.
S-2 Subzone--Branch Distribution
This subzone contains the structural beams, pressure piping and gravity drainage and vents.
S-3 Subzone--Main Distribution
This is the major subzone and is reserved for main distribution of services through the length of the
service zone. It is divided by service into channels. The depth will be governed by HVAC supply
and return/exhaust ducts. Note that crossovers of main ducts are to occur in the Service Bay.
S-4 Subzone--Branch Distribution
This subzone contains mechanical and electrical branches and vents. It is divided by service into
channels. Depth will be governed by HVAC branches.
S-5 Subzone--Lateral Distribution
This subzone takes the final service run to the location of the service drop into the functional zone
below. Any projections from the walk-on platform construction will be parallel to the services at this
level. Formal channels are usually not defined in this subzone.
S-6 Subzone--Platform
This subzone equals the overall depth of the walk-on platform (interstitial deck) construction.
S-7 Subzone--Ceiling
This subzone extends from the underside of the walk-on platform to the bottom of the suspended,
finish ceiling. Limited lateral distribution may occur in this subzone such as offsets in service drops
from the penetration through the walk-on deck to fixture or partition; fixtures and devices recessed
in the finished ceiling; switch legs and whips for lighting fixtures; fire sprinkler; and non-integrated
telecommunications conduit and cabling for public address, nurse call, CATV/MATV systems and
fire alarm system.
S-1 Floor
S-2 Structure &
Plumbing
Branch
Distribution
S-3 Main
Distribution
S-4 Branch
Distribution
S-5 Lateral
Distribution
S-6 Platform
S-7 Ceiling
Figure 2-3
Typical Subzones
SUPPLEMENT TO RESEARCH STUDY REPORT
VA HOSPITAL BUILDING SYSTEM
SECTION 2-8
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