Nathan I. Yost, MD - Principal
Professional Experience
 Residential Construction
Nathan has been involved in residential construction on an
intermittent but consistent basis since high school when he worked
part-time for an architect in Hawaii. After graduation from college he
worked full-time for S & S Contractors, a general contractor in
Baltimore, Maryland. In 1970 Nathan started his own business doing
carpentry, painting and general home repairs in Chicago. During the next
25 years construction assumed a back seat to medicine, but Nathan kept a
hand in construction with numerous renovation projects on his own house,
finishing the interior of his medical offices, and working during
vacations with his brothers’ construction company in New Hampshire. His
latest personal project was a somewhat tricky conversion of a vented
attic under a low-sloped roof (including a ceiling with 19 recessed
lights) to a conditioned space.
Building Investigations
Since 2001 Nathan has investigated moisture and mold problems in more
than 50 buildings; he was the lead investigator in 40 cases. These
buildings ranged from single-family residencies to apartment complexes,
hotels and high-rise condominiums. The causes of moisture intrusion
ranged from improper window flashing to defective drainage planes to
reverse solar drive in reservoir claddings (frequently associated with
negative interior pressures). The underlying problems typically resulted
from flawed designs, improper construction, neglected maintenance or a
combination of the three. Nathan understands the interaction between the
building enclosure and the mechanical systems – bridging the domains of
architecture and engineering.
Training
Nathan has been teaching and training since completing postgraduate
medical training. He has taught medical students and house staff, high
school science students and builders. He has presented building science
seminars to home inspectors, realtors and homeowners at both the
national and local level.
Technical Writing
While working for the Building Science Corporation, Nathan
co-authored several articles on mold. He also wrote several deliverables
for the Building America program on topics such as moisture resistant
basement insulation systems and energy retrofits of existing buildings.
Published technical articles authored by Nathan - on topics such as mold
on framing lumber and construction of conditioned crawl spaces - are
listed below.
Education
- BA – Liberal Arts, Northwestern University, Evanston, IL, 1969
- MD – University of Illinois, Chicago, IL, 1977
- Internal Medicine, Medical University of South Carolina,
Charleston, SC, 1980
- Pulmonary Medicine, Yale University, New Haven, CT, 1983
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