903 Moisture Management: Vapor, Rainwater, Plumbing, HVAC – Above Green

Intent

Moisture and moisture effects are controlled.

903.1 - Plumbing

Plumbing is in accordance with one of the following:

Cold water pipes in unconditioned spaces are insulated to a minimum of R-4 with pipe insulation or other covering that adequately prevents condensation. (2 points)
Plumbing is not installed in unconditioned spaces. (5 points)

903.2 - Duct Insulation

Ducts are in accordance with one of the following:

All HVAC ducts, plenums, and trunks are located in conditioned space. (1 point)
All HVAC ducts, plenums, and trunks are in conditioned space. All HVAC ducts are insulated to a minimum of R4. (3 points)

903.3 - Relative Humidity (7 points)

In climate zones 1A, 2A, 3A, 4A, and 5A, equipment is installed to maintain relative humidity (RH) at or below 60 percent using one of the following:

Additional dehumidification system(s)
Central HVAC system equipped with additional controls to operate in dehumidification mode

Required Documentation

Manufacturer’s literature detailing capabilities. Statement by qualified professional that the system as installed has the capacity to meet the practice.