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Attic Ventilation

Although not usually recognized as a major design consideration, the proper ventilation of the attic area is an essential factor in gaining the maximum service life out of the building materials used in the roof assembly, in addition to improving heating and cooling costs. Overlooking this consideration may result in premature failure of the roofing system:

  • Blistering, distortion, curling or accelerated ageing of the asphalt shingles
  • Rotting of the wood structure, wet insulation due to condensation
  • Buckling of the roof deck


In recent times, energy conservation measures have produced a situation where heat and moisture move into the attic and are retained there. Improved insulation and better weatherstripping are the two major factors bringing about this effect.