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Baffles

 

Damage Caused By Poor Venting

 
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Poor Venting

 
Failed shingles, caused by no soffit venting
  
 

Proper Baffles

 


Attic insulation and proper soffit and roof venting are the most important items in the attic. The roof must have sufficient soffit and roof venting to allow cold outside air to enter in at the over hangs and soffits to be drawn up and out the roof venting systems . Note: Fiberglass blockers above the wall top plate, This keeps the soffits clear of cellulose insulation so that you can insulate to the maximum R-value

 

Venting

 







www.nuwool.com
1-800-748 -0128
®
5/2009
Attic Application
Attics are dry-blown at a density not less
than 1.6 pounds per cubic foot (pcf). The
manufacturers’ coverage chart should be
used for attic application.
This insulation is applied with air during
installation and will settle after it is
applied. The manufacturers’ coverage
chart has taken this settling factor in to
account in calculating coverage. The
chart has a column for installed thickness
and a column for the thickness after
settling. All of these calculations relate to
desired R-values that the installer wants
to achieve. Machines that produce more
air during application, e.g., gas powered
blowing machines, will often increase the
volume of the insulation making it appear
that adequate depth has been reached.
The use of the manufacturers’ coverage
chart is important to insure that regardless
of application the end-user has the
desired R-value. Installing bags rather
than inches will achieve these results.
Recessed lights can be covered with
insulation as long as they are rated IC
(insulation contact). With all other
recessed lights insulation must be kept 3
inches away from the sides. Keep
insulation away from exhaust flues, space
heaters, chimneys, water heaters and any
other heat producing device. Refer to
ASTM C-1015 for insulation guidelines.
Insulation should not be blown into eave
spaces where the ventilation will be
restricted. Care should be taken that
insulation is not blown in to “blind” areas
that could fall into fireplace chases or
other hazardous areas.
Examples of poor installation techniques.
Attic Vent Baffles
1. Vents are available for 16 and 24 inch
spacing.
2. Crease sides to fit and staple in-place
every 12 inches.
3. Foam baffles are bent to fit and natural
pressure keeps them in-place.
4. It is important to have enough eave baffle
vents to equal the prescribed ventilation
for the attic assuming a split between
upper and lower ventilation.
5. Insure that the baffle rests on the furthest
point of the plate, the cold side.
www.nuwool.com
1-800-748 -0128
  
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