Attic Ventilation is the MOST Important Part of Roofing.

Proper attic ventilation extends the life of a roof and reduces problems, by minimizing the temperature differential between the attic and the air outside. Proper ventilation will remove moisture and heat from the attic. Trapped heat and moisture can raise energy costs, create ice dams, and damage roof system components, as well as structural and personal items located inside the attic where temperatures can easily reach 150 F (65 C).

Condensation that forms inside attics can be caused by the use of washing machines, dish washers, bath tubs, showers, and tumble dryers, unless these items are properly ventilated through the roof. In some cases, the condensation can be bad enough to be mistaken for a roof leak.

Here are some problems associated with an improperly ventilated attic space:
  • Sags between rafters (deck deflection) can happen over time, (sometimes several years, sometimes only a couple years), a plywood and or OSB roof deck can warp or deteriorate and become spongy and dangerous to walk on. This occurs because one side of plywood decking needs be able to "breathe" by being exposed to circulating air. The adhesives used in the plywood and/or OSB can deteriorate, or dry rot can occur because of condensation.

  • Water vapour will condense first on anything metal inside the attic; this will eventually cause the metal to rust. Heads can rust off nails, metal plumbing straps or straps holding HVAC ducting can rust into two pieces causing the ducting to crash down on top of the ceiling joists or through a suspended ceiling. This problem is more common in humid climates.

  • In colder climates or climates with extreme temperature changes generally where the average January temperature is 32 F (0 C) or colder high inside humidity (40% or greater) combined with low outside temperatures can cause frost to form on the bottom of the roof deck.

  • Insulation can trap moisture which will reduce the R-value of the insulation and create a nice environment for the propagation of certain mold, spores, and fungi which will also cause problems.

  • There is also the problem of mildew which is both damaging and can cause health problems.

  • The roof system itself will deteriorate prematurely.

  • Cooling units will need to be serviced or replaced prematurely because of excessive use.

  • Ice dams are the result of melting snow continually re-freezing at the roof perimeter and then backing up under the shingles and causing leaks. Proper ventilation used in conjunction with heavy insulation and an air barrier can create a Cold Roof Assembly which will help eliminate ice dams.
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