Buildings can be hot and humid from head to toe. Find out how you can change this trend.

As hot air rises, roofs and top storeys tend to get higher temperatures than lower floors. Vents can be placed alongside roof ridges, gables and under eaves to allow air to flow in through these areas.

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  • Ridge vents     

Roof ridge vents can be placed on the peak of the roof allowing exhaust ventilation all along the roofline with external baffle and internal filter for optimum airflow and weather protection. They can be less than 3cm or up to 20cm and the former are best used coupled with metal sheeting or low tiles, such as shingles, and the latter with glazed tiles.

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  • Power vents

Power vents can be roof or wall mounted. These electric-powered attic vents use a thermostat and humidity control to monitor heat and moisture build-up inside the attic and can also be solar-powered. They often replace damaged wind turbines or old roof pots.

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  • Static vents

These can be of three kinds:

  1. roof louvers – you will require several, placed evenly across the roof space to be effective;
  2. wall louvers –  installed in the gable end of the attic as high as possible and should be of sufficient size so as not to result in hot spots;
  3. wind turbines – these vents use the natural force of wind and air pressure to spin and vent out stale attic air but require local winds of at least 5 mph.

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  • Attic intake vents

These can be continuous soffit vents, under eave vents, vented drip edges along gables or roofs with little or no soffit area and edge vents for buildings with practically no overhang.

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  • Foundation vents

These can be powered or manual vents and they help remove moisture which can lead to damp rot and termites and suctions air out of foundations. They should be placed evenly along the perimeter of the building and be provided with removable screens for easy cleaning. Manual vents should have resistant and rust-free damper and sliders.

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  • Whole-house fans

These are installed flat in a central position within the ceiling of the top storey and pulls fresh outdoor air through open windows. They can be operated through a pull chain[1] or integrated with a pulley system to provide smooth and quiet operation.[2]

 

Image Source: http://www.airvent.com

 

By Silvia Pelham

 

 

 

 

 

 

 

 

                                                                                                        


[1] Direct-drive.

[2] Belt-drive.

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