When skylights are
installed, attention should be paid to how the vertical shafts extending
from the roof to the ceiling are insulated. Unsealed attics are often
insulated along the attic floor with blown fiberglass or cellulose
insulation.
A different type of insulation will need to be
installed along the skylight shaft walls, one that will maintain full
alignment (or contact) with the back side of the sheathing for the
height of the skylight shaft walls and that will maintain at least the
minimum required depth of insulation along the full height.
Skylight
shaft walls should be insulated to the same R-value as other exterior
walls if the attic they pass through is not insulated.
IAC2 is the non-profit certifying body for home and building
inspectors who have fulfilled certain educational and testing
requirements, including those in the area of indoor air quality.
