Injection / Wall-Cavity Drying System Sizing
Sizes an injection / wall-cavity drying system.
Example
You enter
- Affected wall length (ft) 32
- Stud spacing (in, on-center) 16
- Injection ports per stud bay 1
- Ports a single air system serves 12
You get
- Stud bays 24
- Injection ports 24
- Air systems 2 system(s)
Checked against published worked examples from: ANSI/IICRC S500 bays-from-length geometry.
Details, formula, and sources
ScopeThe stud-bay count from the wall length and stud spacing, the injection port count, and the number of air-delivery systems - the minimally invasive alternative to a flood cut for drying enclosed assemblies in place. Port count and ports per system are manufacturer-specific; respect cavity contamination and pressure direction; the restorer and IICRC S500 govern.
Formula or tablebays = ceil(affected_wall_ft x 12 / stud_spacing_in); ports = bays x ports_per_bay; systems = ceil(ports / ports_per_system).
Source and editionBays-from-length geometry, by name; ANSI/IICRC S500. The stud-bay and system counts are field-arithmetic identities, not edition-bound.
Free accessSizes the injection / wall-cavity drying method - the minimally invasive alternative to a flood cut for drying enclosed assemblies in place.
What governsEstimate. AHJ and licensed professional govern.
API field namesaffected_wall_ft, stud_spacing_in, ports_per_bay, ports_per_system, bays, ports, systems
- Manufacturer defaults ports per bay (default 1) and ports per system (default 12) are typical, not prescriptiveequipment manufacturer
- Contamination direction do not push Category 2/3 cavity air into clean spacesANSI/IICRC S500