RR-0206: Foundations—Moisture Resistant Construction

Builders for many years have put mechanical equipment and ducts in non-living spaces such as crawls and attics primarily to save valuable floor space. Be that as it may (there are lots of good reasons for having this equipment in conditioned spaces, GIVEN proper attention to ventilation and pressurization issues), it makes perfect sense to condition these areas, for a variety of energy, moisture and durability reasons.