Anonymous asked in Home & GardenDo It Yourself (DIY) · 2 months ago

What is attic ventilation? Do I need that for my building?

8 Answers

  • 2 months ago

     ..most problems with poor ventilation is caused by poorly placed insulation ..the insulation should not go any further than ceiling edge ..keep soffit areas clear ..the insulation should be deep enough to comply with local regs in uk its 11" of fibreglass ..4" kingspan ..the insulation should not block airflow between soffits and rafters ..and always try for crossflow  

  • 2 months ago

    Attic ventilation makes a huge difference in summer heat.  Your air conditioner will not cost as much to run.  But it is very important that any fan have a fire safety switch to turn it off should you ever have a fire.

  • 2 months ago

    yes you do need it 

  • ?
    Lv 5
    2 months ago

    Yes you do need it.

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  • 2 months ago

    I have seen attics with wind turbine type vents,  run solely by the wind blowing on them.    Some people install electric vents which help keep the temperature down in the summer and humidity down in the winter.    In some locals the attic is allowed to get hot or cold depending on the season and the insulation is flat against the ceiling of the house inside.    Others the attic is insulated right up to the peak of the house with no vents and it stays cooler in the summer and warmer in the winter than if you did not insulate.  If you plan on using the attic for storage you might want to insulate it and not ventilate it. 

  • Anonymous
    2 months ago

    Depends on the construction of your roof and where your insulation is placed. Ventilation is necessary to prevent roof timbers rotting - inadequate ventilation will cause the right conditions for beetle infestation (woodworm) or dry rot, both of which can be catastrophic.

  • 2 months ago

    designing a building is not a job for an amateur.  have this done right.  what you need depends on the climate and construction materials, among other things, plus local building code

  • 2 months ago

    Usually it is needed to allow moisture to exchange with the outside.  Otherwise, moisture rises with warm air from the living spaces below and accumulates, and this leads to possible issues with decay and degradation of structural components (rot and rust).  Usually, we do not heat the attic spaces, so moisture will condense on the walls or roof interior and cause damage, or less commonly, actually run down and affect the vertical walls below.

    It is pretty normal to have some sort of air exchange system beyond the soffits under the eaves, and people often cover the soffits when doing insulation on their own, ruining their purpose as ventilation aides.  Whether you need a roof vent or vents depends on the situation. Climate is also a factor. Lateral vents (vents in the outer walls of gables or equivalent ridge-topped outer walls) are sometimes enough.

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