Special Ceiling Air

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 HOME BUILDING CONSTRUCTION PROBLEMS - SPECIAL CEILING HOME INDOOR AIR QUALITY CONSIDERATIONS
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hOME BUILDING CONSTRUCTION PROBLEMS - special CONSIDERATIONS IN CEILING INSULATION VENTING INDOOR AIR QUALITY

SPECIAL CEILING INSULATION INDOOR AIR QUALITY - CATHEDRAL CEILING, ARCH CEILING, ANGLED CEILING, VAULT CEILING, RAISED CEILING, HIP ROOF CEILING, TRAY CEILING, ETC.

Special Ceiling Venting for Insulation Indoor Air Quality
bulletSpecial consideration shall be made for ceilings of any sort abutting exterior framing - cathedral ceiling, arch ceiling, angled ceiling, vault ceiling, hip roof ceiling, raised ceiling, tray ceiling, etc. - where the interiors' wallboard ceiling or dry wall ceiling or plaster ceiling or wood ceiling -  is fastened tight to the interiors' faces of rafters or bottom chords
 
bulletCeiling area along rafter lines
bulletShall substitute for ventilated surface area for indoor air quality calculation and
bulletEach plane of ceiling along rafter lines shall constitute an area to be distinctly ventilated (most critical in hip roof applications, notably involving skylights, stacks, and similar intrusions within rafter bays) for both calculation and application and
bulletFor free and completely unobstructed space for air flow shall not be less than 2 linear inches from roofing sheathing toward interiors along entire width and length of each rafter bay
 
bulletAside from simply deepening dimensioned lumber to accommodate both the 2 linear inches continuous and unobstructed air space and the flushed roofing sheathing supports, one may consider alternatives, among them 
bulletFurring to the interior faces of rafters in marginal remediations
bulletHeavier sheathing (say, 3/4 linear inch in lieu of more common 1/2 linear inch)
bulletLet-in steel strapping on not greater than 4 linear feet centers in lieu of the flushed 2 linear inches x 4 linear inches
 
bulletA practiced option to venting for indoor air quality in such conditions as cathedral ceilings and the like (and others, particularly in environments subject to excessively cold weather) is to apply a so-called “cold roof” as described in For Pros/By Pros: Framing Roofs (The Best of Fine Homebuilding), “Framing a Cold Roof: Preventing roof leaks caused by ice damming” by Steve Kearns, The Taunton Press, Inc., 1998, ISBN 1-56158-328-6

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