Flat Roof Ventilation Requirements

There are two types of flat roof.

Flat roof ventilation requirements. When thermal insulation is placed below the deck the ventilation must also be on the underside. Cold roofs and warm roofs. Enter square footage calculate or enter the square footage of the attic or area to be vented. The answer depends on the type of roof you have.

Rooftop ventilation for flat or low slope roofs 2 12 or less flat roof ventilation is achieved by creating air changes to the attic or plenum. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. It depends on where the insulation is installed. There are two types of flat roof systems warm and cold roofs which affect the positioning of the ventilation.

How much ventilation does a flat roof need. 2011 code of practice for control of condensation in buildings stipulates that there should be a ventilation gap between the insulation and the bottom of the flat roof deck of at least 50mm. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.

Any type of roof from tpo to epdm can be either hot or cold. Ventilation is crucial to these areas as they affect the building as a whole both inside and out.