Attic ventilation can be a confusing, complex subject and is the
topic of many discussions, research papers and articles. For
example, in the June 2012 issue, the article "Vexing ventilation
issues" focuses on building code requirements for attic
ventilation. In the article, there was some discussion about
unvented attic assemblies because the 2009 International
Residential Code® (IRC) introduced provisions allowing this
construction type. Some readers found the concept of unvented
attics even more confusing than attic ventilation. And NRCA has
received numerous calls from homeowners and contractors regarding
converting existing attics into unvented attics.
Ventilating attic spaces is viewed by many roofing professionals
as a technical requirement for steep-slope roof assemblies and
often is a building code requirement. However, as mentioned, attics
can be designed to be vented or unvented.
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